LYONDELL PETROCHEMICAL CO
10-K405, 1998-03-31
PETROLEUM REFINING
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<PAGE>
 
================================================================================
                                      1997

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                   FORM 10-K
                                _______________
     (Mark One)

     [  X  ]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
              SECURITIES EXCHANGE ACT OF 1934

              For the fiscal year ended December 31, 1997

     [     ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
              SECURITIES EXCHANGE ACT OF 1934

                          COMMISSION FILE NO. 1-10145

                         LYONDELL PETROCHEMICAL COMPANY
             (Exact name of Registrant as specified in its charter)

                                _______________

          DELAWARE                                       95-4160558
     (State or other jurisdiction of        (I.R.S. Employee Identification No.)
     incorporation or organization)

         1221 MCKINNEY STREET,
      SUITE 1600, HOUSTON, TEXAS                             77010
  (Address of principal executive offices)                (Zip Code)

      Registrant's telephone number, including area code:  (713) 652-7200

          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

                                            Name of each exchange
          Title of Each Class                on which registered
          -------------------                -------------------
     COMMON STOCK ($1.00 PAR VALUE)          NEW YORK STOCK EXCHANGE

          SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                                      None

     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or such shorter period that the Registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

                          Yes     [x]     No
                              -----------    ----------

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of the Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.
                                       [x]
                                     ------

     There were 79,036,488 shares of the registrant's common stock outstanding
on December 31, 1997.  The aggregate market value of the voting stock held by
non-affiliates of the registrant on February 27, 1998 based on the closing price
on the New York Stock Exchange composite tape on that date, was $2,075,103,605.

                      DOCUMENTS INCORPORATED BY REFERENCE

     The registrant's definitive proxy statement, which will be filed with the
Securities and Exchange Commission within 120 days after December 31, 1997
(incorporated by reference under Part III).

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS


Item                                                                   Page
- ----                                                                   ----


                                    PART I

1. and 2.   Business and Properties...................................... 1
            THE COMPANY'S BUSINESS....................................... 1
            --Development of Business.................................... 1
            LYONDELL BUSINESS STRATEGY................................... 2
            SUMMARY DESCRIPTION OF BUSINESS SEGMENTS..................... 3
            EQUISTAR CHEMICALS, LP....................................... 4
             EQUISTAR BUSINESS STRATEGY.................................. 4
             MANAGEMENT OF EQUISTAR...................................... 4
             EQUISTAR PETROCHEMICALS SEGMENT............................. 5
             -- Overview................................................. 5
             -- Feedstocks and Ethylene Purchases........................ 7
             -- Marketing, Sales and Distribution........................ 8
             -- Competition and Industry Conditions...................... 8
             -- Capital Program.......................................... 9
             EQUISTAR POLYMERS SEGMENT................................... 9
             -- Overview................................................. 9
             -- Feedstocks.............................................. 11
             -- Marketing, Sales and Distribution....................... 11
             -- Competition and Industry Conditions..................... 12
             -- Capital Program......................................... 12
             AGREEMENTS BETWEEN LYONDELL AND EQUISTAR................... 12
             PROPERTIES................................................. 14
             RESEARCH AND TECHNOLOGY; PATENTS AND TRADEMARKS............ 15
             EMPLOYEE RELATIONS......................................... 15
            LYONDELL-CITGO REFINING COMPANY LTD......................... 16
             Overview................................................... 16
             LCR Business Strategy...................................... 16
             Upgrade Project............................................ 16
             1998 Refinancing........................................... 17
             Management of LCR.......................................... 17
             Feedstocks................................................. 17
             Marketing and Sales........................................ 18
             Agreements between Lyondell, CITGO and LCR................. 18
             Agreements between Equistar and LCR........................ 18
             Competition and Industry Conditions........................ 18
             Capital Program............................................ 19
             Properties................................................. 19
             Employee Relations......................................... 19
            LYONDELL METHANOL COMPANY, L.P.............................. 20
             Overview................................................... 20
             Lyondell Methanol Business Strategy........................ 20
             Management of Lyondell Methanol............................ 20
             Feedstocks................................................. 20
             Marketing, Sales and Distribution.......................... 20
             Agreements between Equistar and Lyondell Methanol.......... 20
             Competition and Industry Conditions........................ 21
             Capital Program............................................ 21
             Properties................................................. 21
             Employee Relations......................................... 21


                                       i
<PAGE>
 
                         TABLE OF CONTENTS (CONTINUED)
 
 
Item                                                                   Page
- ----                                                                   ----
 
            LYONDELL PROPERTY AND EMPLOYEE RELATIONS...................  21
            ENVIRONMENTAL MATTERS......................................  21
3.          Legal Proceedings..........................................  22

            EXECUTIVE OFFICERS OF THE REGISTRANT.......................  24
4.          Submission of Matters to a Vote of Security Holders........  24

                                    PART II

5.          Market for Registrant's Common Equity and Related
              Stockholder Matters......................................  25
6.          Selected Financial Data....................................  26
7.          Management's Discussion and Analysis of Financial Condition
              and Results of Operations................................  26
8.          Financial Statements and Supplementary Data................  40
9.          Changes in and Disagreements with Accountants on Accounting
              and Financial Disclosure.................................  99

                                   PART III

10.         Directors and Executive Officers of the Registrant.........  99
11.         Executive Compensation.....................................  99
12.         Security Ownership of Certain Beneficial Owners and
              Management...............................................  99
13.         Certain Relationships and Related Transactions.............  99

                                    PART IV

14.         Exhibits, Financial Statement Schedules and Reports on
              Form 8-K................................................. 100


                                      ii
<PAGE>
 
                                     PART I


ITEMS 1 AND 2.  BUSINESS AND PROPERTIES

                             THE COMPANY'S BUSINESS

Lyondell Petrochemical Company ("Lyondell" or the "Company") operates through
its interests in three joint ventures  in the petrochemicals, polymers, refining
and methanol businesses.  Through its 57 percent interest in Equistar Chemicals,
LP, a Delaware limited partnership ("Equistar"), Lyondell manufactures a wide
variety of petrochemicals and polymers.  Equistar's petrochemicals business
manufactures olefins, methyl tertiary butyl ether ("MTBE"),  aromatics and ethyl
alcohol.  Equistar's petrochemicals products are used primarily in the
manufacture of other chemicals and products, including the production of
polymers by Equistar and its customers.  Equistar's polymers business
manufactures polyolefins, including high density polyethylene ("HDPE"), low
density polyethylene ("LDPE"), linear low density polyethylene ("LLDPE"),
polypropylene and performance polymers, all of which are used in the production
of a wide variety of consumer and industrial products.  Equistar's performance
polymers include enhanced grades of polyethylene, including wire and cable
resins, concentrates and compounds, and polymeric powders. Through its 58.5
percent interest in LYONDELL-CITGO Refining Company Ltd., a Texas limited
liability company ("LCR"), the Company produces refined petroleum products,
including gasoline, low sulfur diesel, jet fuel, aromatics and lubricants ("lube
oils").  LCR sells its principal refined products primarily to CITGO Petroleum
Corporation ("CITGO").  Lyondell produces methanol through its 75 percent
interest in Lyondell Methanol Company, L.P., a Texas limited partnership
("Lyondell Methanol").

DEVELOPMENT OF BUSINESS

From its formation in 1985 through January 1989, Lyondell operated first as a
division, and later as a wholly owned subsidiary, of Atlantic Richfield Company
("ARCO").  In January 1989, ARCO completed an initial public offering of
approximately 50.1 percent of the Company's Common Stock.  In September 1997,
ARCO divested substantially all of its remaining holdings of the Lyondell Common
Stock pursuant to the terms of notes issued by ARCO in August 1994, which were
satisfied at maturity by the delivery of shares of Lyondell Common Stock held by
ARCO.  On September 15, 1997, ARCO filed an amendment to its Schedule 13D filed
with the Securities and Exchange Commission indicating that, effective as of
such date, it had ceased to beneficially own greater than five percent of the
outstanding Lyondell Common Stock.

In July 1993, pursuant to agreements between the Company and CITGO (and its
affiliates), the Company contributed its refining business, including its
Houston, Texas refinery ("the Refinery"), its lube oil blending and packaging
plant in Birmingport, Alabama and refining working capital to LCR.  The Company
retained a 90 percent interest in LCR through its wholly owned subsidiary,
Lyondell Refining Company, while CITGO held the remaining approximately 10
percent interest.  Following completion of  a major upgrade project (the
"Upgrade Project") at the Refinery in the first quarter of 1997, the Company's
interest in LCR was reduced to 58.5 percent.  See "LYONDELL-CITGO REFINING
COMPANY LTD. -- Upgrade Project".

In May 1995, the Company acquired Occidental Chemical Corporation's ALATHON/(R)/
HDPE business.  Assets involved in this acquisition included resin production
facilities in Matagorda County and Victoria, Texas, related research and
development activities and the rights to the ALATHON/(R)/ trademark.

In December 1996, the Company announced the formation of Lyondell Methanol with
MCN Investment Corporation ("MCNIC"), a division of MCN Corporation, to own the
Company's 248 million gallons per year methanol plant.  Under the terms of the
agreement, MCNIC purchased a 25 percent interest in the methanol plant.
Lyondell retained a 75 percent interest and serves as managing partner.  Since
December 1997 Equistar has served as the operator of Lyondell Methanol.

                                       1
<PAGE>
 
In December 1997, following approval by the stockholders of each company,
Lyondell and Millennium Chemicals Inc. ("Millennium") combined most of their
petrochemicals and polymers businesses in Equistar. Lyondell contributed
substantially all of the assets comprising its petrochemicals and polymers
business segments, as well as a $345 million note, in exchange for a 57 percent
interest in Equistar. Equistar also assumed $745 million of Lyondell's debt.
Millennium contributed substantially all of the assets comprising its olefins,
ethyl alcohol, polyethylene, polypropylene and performance products businesses,
which had been held in Millennium Petrochemicals Inc. ("Millennium
Petrochemicals"), a wholly owned subsidiary of Millennium. In exchange,
Millennium received a 43 percent interest in Equistar, Equistar repaid $750
million of debt due to Millennium from its contributed businesses and Millennium
retained $250 million of its accounts receivable.

On March 20, 1998, Lyondell and Millennium announced an agreement to expand
Equistar with the addition of the ethylene, propylene and ethylene oxide ("EO")
and ethylene glycol ("EG") derivatives businesses of Occidental Chemical
Corporation ("Occidental Chemical"), a subsidiary of Occidental Petroleum
Corporation ("Occidental"). This addition will include three olefins plans, an
EO/EG derivatives plant and Occidental Petroleum's 50 percent interest in a
joint venture with DuPont, which operates an EO/EG plant. Occidental Petroleum
will also contribute more than 950 miles of pipelines located on the Gulf Coast
of the United States. Equistar will assume approximately $200 million of
Occidental Petroleum debt. The Company believes that this transaction will make
Equistar the world's second largest producer of ethylene with more than 11.4
billion pounds of annual capacity.

The transaction, which is subject to, among other things, Occidental board
approval, regulatory approval and the acquisition by Equistar of a larger credit
facility, is expected to close by mid-year 1998. At closing, Equistar will
borrow approximately $500 million of additional debt in order to distribute cash
of approximately $425 million to Occidental Petroleum and $75 million to
Millennium. Following the closing, Equistar will be owned 41 percent by Lyondell
and Millennium and Occidental will each own 29.5 percent. Equistar and
Occidental will also enter into a long-term agreement for Equistar to supply the
ethylene requirements for Occidental's chlorovinyls business.

The Company's principal executive offices are located at 1221 McKinney Street,
Houston, Texas 77010 (Telephone (713) 652-7200).

                           LYONDELL BUSINESS STRATEGY

Lyondell's mission is to maximize total return to its stockholders.  Lyondell
recently announced its goal to grow earnings per share by ten percent on a five-
year rolling average.  The focus is on generating maximum earnings and cash
flow, and deploying that cash in a manner that creates value for Lyondell's
stockholders.  The Company seeks to achieve this through active management of
its joint venture interests.  This strategy focuses on three elements:

     .    Pursue efforts to continually improve the low cost structure of its
          joint ventures. Lyondell believes that the formation of Equistar
          provides the opportunity to significantly improve the cost position of
          the petrochemicals and polymers businesses. LCR is implementing a
          strategic plan to improve the cost structure of the refining segment.

     .    Continue to seek opportunities to expand or diversify Lyondell's
          business. This could be through focused capital investment, additional
          joint ventures, acquisitions or other arrangements designed to add
          economic value. Such opportunities could be undertaken by Lyondell
          directly or through one of its joint ventures.

     .    Explore all options to maximize total return to stockholders,
          including various methods of returning cash directly to stockholders.

Both the Company's ability to undertake and fund the particular strategies
described above and the level of the Company's capital commitments and
expenditures from period to period will be affected by a variety of factors
including, without limitation, the general business environment, as well as
changes in applicable government regulations and tax laws.

                                       2
<PAGE>
 
                    SUMMARY DESCRIPTION OF BUSINESS SEGMENTS

Through the year ended December 31, 1996, the Company reported its results of
operations in two segments, petrochemicals and refining.  Beginning in 1997, the
Company reported the results of its polymers operations as a separate segment.
Beginning in 1998, the Company will report results in four segments:
petrochemicals, polymers, refining and methanol.  Accordingly, for purposes of
this summary description of business segments, the Company's methanol business
is discussed as a separate segment.  The Company operates in the petrochemicals
and polymers segments through Equistar, in the refining segment through LCR and
in the methanol segment through Lyondell Methanol.

The following chart shows the organization of Lyondell's joint ventures and
segments, as well as each joint venture's 1997 sales revenues, which, in the
case of Equistar represents pro forma sales revenues for 1997 (as if Equistar
had been formed on January 1, 1997). Total sales revenue is shown for each joint
venture, of which ventures Lyondell owns the specified percentage.


                             [Chart Appears Here showing Lyondell's ownership
interests in each of Equistar (57 percent), LCR (58.5 percent) and Lyondell
Methanol (75 percent); the 1997 sales revenues of each of Equistar (pro forma),
LCR and Lyondell Methanol, which were $4.5 billion, $2.7 billion and $165
million, respectively; and the primary products of each of the petrochemicals,
polymers, refining and methanol segments]


For additional segment information for each of the three years in the three-year
period ended December 31, 1997, see Note 21 of NOTES TO CONSOLIDATED FINANCIAL
STATEMENTS.

                                       3
<PAGE>
 
                             EQUISTAR CHEMICALS, LP

EQUISTAR BUSINESS STRATEGY

Equistar's strategies include:

 . Achieve synergy targets in earnings and cash flow and continue to reduce
  costs, by focusing on:
    .  Aligning and optimizing processing units for improved on-stream time and
       increased throughput
    .  Maximizing the value of the olefin co-products produced in the olefins
       operations
    .  Lowering distribution costs through volume leverage
    .  Reducing raw materials costs

 . Focus on capital projects designed to increase reliability and undertake cost
  efficient debottlenecking of value-added product lines.  Equistar plans to do
  this in part by:
    .  Completing 125 million pound HDPE expansion at its Victoria facility with
       an expected startup in late 1998, with committed sales base in high value
       products
    .  Proceeding with 480 million pound HDPE resin expansion project at its
       Matagorda facility for late 1999 startup, to support continued high-
       molecular weight HDPE film growth

 . Pursue a market strategy of expanding value-added businesses, with minimal
  capital especially by:
    .  Increasing sales volume in key markets, such as high molecular weight and
       medium molecular weight high-density polyethylene film resins, value and
       specialty injection molding resins, wire and cable resins and sheet resin
       products

 . Leverage technology, including by:
    .  Pursuing research on alternative olefins feedstock technology as a method
       to lower costs and gain competitive advantage
    .  Combining Lyondell-contributed single-site catalyst proprietary
       technology with Millennium-contributed process technologies, enabling
       Equistar to optimize production of higher-margin value-added products

MANAGEMENT OF EQUISTAR

Equistar is a limited partnership organized under the laws of the state of
Delaware and is a pass-through entity for federal income tax purposes.  Lyondell
owns its interest in Equistar through two wholly owned subsidiaries, one of
which serves as a general partner of Equistar and one of which serves as a
limited partner.  Similarly, Millennium owns its interest in Equistar through
two wholly owned subsidiaries, one a general partner and one a limited partner.
Lyondell holds a 57 percent interest and Millennium holds a 43 percent interest
in Equistar. The Partnership Agreement of Equistar (the "Equistar Partnership
Agreement") governs, among other things, ownership, cash distributions, capital
contributions and management of Equistar.

The Equistar Partnership Agreement provides that Equistar is governed by a
Partnership Governance Committee, consisting of six representatives, three
appointed by each general partner. Matters requiring agreement by the
representatives of Lyondell and Millennium include changes in the scope of
Equistar's business, the five year strategic plan (and annual updates thereof),
the sale or purchase of assets or capital expenditures of more than $30 million
not contemplated by the strategic plan, requiring additional investments by
Equistar's partners over certain amounts, merging or combining with another
business and certain other matters. All decisions of the Partnership Governance
Committee that do not require unanimity between Lyondell and Millennium may be
made by Lyondell's representatives alone. The day-to-day operations of Equistar
are managed by the executive officers of Equistar. Dan Smith, the Chief
Executive Officer of Lyondell, also serves as Chief Executive Officer of
Equistar.

                                       4
<PAGE>
 
EQUISTAR PETROCHEMICALS SEGMENT

OVERVIEW

Equistar produces petrochemicals at seven facilities located in five states.
The Channelview, Texas facility includes two large olefins plants and related
processing units that produce ethylene, propylene, butadiene, butylenes,
benzene, toluene, hydrogen and certain specialty products, such as isoprene,
dicyclopentadiene ("DCPD"), resin oils and piperylenes, along with gasoline
blendstocks and heavy liquid fuels.  The La Porte, Texas, Morris, Illinois and
Clinton, Iowa complexes each include one large olefins plant that primarily
produces ethylene, substantially all of which is consumed internally by
Equistar's polymers operations.  Feedstocks for the Channelview and LaPorte
facilities and ethylene and propylene products are stored at Equistar's Mont
Belvieu, Texas storage facility and terminals on the Houston ship channel.  A
comprehensive pipeline system connects the two plants with major olefins
customers.  Feedstocks for Equistar's Morris and Clinton facilities are shipped
via pipeline.

Equistar produces synthetic ethyl alcohol at its Tuscola, Illinois plant by a
direct hydration process that combines water and ethylene.  Equistar also owns
and operates facilities at Newark, New Jersey and Anaheim, California for
denaturing ethyl alcohol by the addition of certain chemicals.  In addition, it
produces small volumes of diethyl ether, a by-product of its ethyl alcohol
production, at Tuscola.  These ethyl alcohol products are ingredients in various
consumer products and are used for other consumer and industrial purposes, as
described more fully in the table below.

Equistar's petrochemicals products are used to manufacture intermediate
chemicals, which are primarily used in a variety of consumer and industrial
products.  Petrochemicals are fundamental to many segments of the economy,
including the production of consumer products, housing components, automotive
products and other durable and non-durable goods.  Ethylene is the most
significant petrochemical in terms of worldwide production volume and is the key
building block for polyethylene and a large number of other chemicals, plastics
and synthetics.  With the strong growth of end-use products derived from
ethylene during the past several decades, especially as plastics have developed
into low cost, high performance substitutes for a wide range of materials such
as metals and paper, U.S. ethylene consumption has grown by an average annual
rate of more than four percent.

The following table outlines Equistar's primary petrochemical products, annual
capacity and the primary uses for such products.

                                       5
<PAGE>
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------- 
                       RATED                                                                                      
PRODUCT                CAPACITY (a)             PRIMARY USES                                
- -------                ------------             ------------      
- ----------------------------------------------------------------------------------------------------------------------------- 
<S>                    <C>                      <C>
OLEFINS
- ----------------------------------------------------------------------------------------------------------------------------- 
ETHYLENE               7.7 billion pounds       Ethylene is used as a feedstock to manufacture polyethylene, ethylene
                                                oxide, ethylene dichloride and ethylbenzene.  Polyethylene is used for
                                                films for food packaging and trash bags and for blow-molded bottles for
                                                milk, orange juice, shampoo and detergents.  Ethylene oxide is used to
                                                produce ethylene glycol which in turn is used to produce antifreeze and
                                                polyester.  Ethylene dichloride is used to produce polyvinyl chloride
                                                (PVC) for pipe and other vinyl products.  Ethylbenzene is used to
                                                produce styrene, which in turn is used to produce polystyrene for food
                                                packaging and drinking cups.
- ----------------------------------------------------------------------------------------------------------------------------- 
PROPYLENE              3.4 billion pounds (b)   Propylene is used to produce polypropylene, acrylonitrile and propylene
                                                oxide.  Polypropylene is used in products such as caps, closures, rigid
                                                packaging and carpet facing and backing.  Acrylonitrile is used in
                                                clothing (acrylic fibers) and high impact plastics (computers, auto
                                                parts). Propylene oxide is used in polyurethane foams for furniture and
                                                insulation.
- ----------------------------------------------------------------------------------------------------------------------------- 
BUTADIENE              840 million pounds       Butadiene is used to manufacture styrene butadiene rubber and
                                                polybutadiene rubber, which are used in the manufacture of tires, hoses,
                                                gaskets and other rubber products. Butadiene is also used in the
                                                production of paints, adhesives, nylon clothing, carpets and engineering
                                                plastic parts.
- ----------------------------------------------------------------------------------------------------------------------------- 
AROMATICS
- ----------------------------------------------------------------------------------------------------------------------------- 
BENZENE                117 million gallons      Benzene is used to produce styrene, phenol and cyclohexane.
                                                These products are used in the production of nylon, plastics, rubber, and
                                                polystyrene.  Polystyrene is used in life preservers, food packaging and
                                                drinking cups.
- ----------------------------------------------------------------------------------------------------------------------------- 
TOLUENE                40 million gallons       Toluene is used as an octane enhancer in gasoline and as a chemical
                                                feedstock for benzene production.
- ----------------------------------------------------------------------------------------------------------------------------- 
OXYGENATED PRODUCTS
- ----------------------------------------------------------------------------------------------------------------------------- 
MTBE                   199 million gallons      MTBE is an octane enhancer and clean fuel additive in reformulated
                                                gasoline.
- ----------------------------------------------------------------------------------------------------------------------------- 
</TABLE>
____________________
(a) Represents rated capacity at January 1, 1998.  The term "rated capacity", as
    used in this table, is calculated by estimating the number of days in a
    typical year that a production unit of a plant is expected to operate, after
    allowing for downtime for regular maintenance, and multiplying that number
    by an amount equal to the unit's optimal daily output based on the design
    feedstock mix.  Because the rated capacity of a production unit is an
    estimated amount, the actual production volumes may be more or less than
    rated capacity.  Capacities shown include 100 percent of the capacity of
    Equistar, of which the Company owns 57 percent.

(b) Does not include refinery grade material or production from the product
    flexibility unit at the Channelview facility, which has a current rated
    capacity of one billion pounds per year of propylene.

                                       6
<PAGE>
 
<TABLE>
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------- 
                      RATED                                                                                        
PRODUCT               CAPACITY (a)         PRIMARY USES                                    
- -------               ------------         ------------
<S>                   <C>                  <C>
- ------------------------------------------------------------------------------------------------------------------------- 
SPECIALTY PRODUCTS
- ------------------------------------------------------------------------------------------------------------------------- 
DICYCLOPENT-          100 million pounds   DCPD is a component of inks, adhesives and polyester resins for molded
ADIENE                                     parts such as tub and shower stalls and boat hulls.
 (DCPD)
- ------------------------------------------------------------------------------------------------------------------------- 
ISOPRENE              105 million pounds   Isoprene is a component of premium tires, adhesive sealants and other
                                           rubber products.
- ------------------------------------------------------------------------------------------------------------------------- 
RESIN OIL             120 million pounds   Resin oil is used in the production of hot melt adhesives, inks,
                                           sealants,
                                           paints and varnishes.
- ------------------------------------------------------------------------------------------------------------------------- 
PIPERYLENES           100 million pounds   Piperylenes are used in the production of adhesives, inks and sealants.
- ------------------------------------------------------------------------------------------------------------------------- 
HYDROGEN              80 million cubic     Required by refineries to remove sulfur from process gas in heavy crude
                      feet/day             oil.
- ------------------------------------------------------------------------------------------------------------------------- 
ALKYLATE (c)          19,000 barrels/day   Alkylate is a premium blending component used by refiners to meet
                                           Clean Air Act standards for reformulated gasoline.
- ------------------------------------------------------------------------------------------------------------------------- 
ETHYL ALCOHOL         50 million gallons   Ethyl alcohol is used in the production of solvents, household, medicinal
                                           and personal care products and as a chemical intermediate for
                                           applications such as vinegar.
- ------------------------------------------------------------------------------------------------------------------------- 
DIETHYL ETHER         5 million gallons    Diethyl ether is used in laboratory reagents, gasoline and diesel engine
                                           starting fluid, liniments, analgesics and smokeless gun powder.
- ------------------------------------------------------------------------------------------------------------------------- 
</TABLE>

____________________
(c) Includes up to 11,250 barrels/day of capacity which is operated for the
    benefit of LCR.

FEEDSTOCKS AND ETHYLENE PURCHASES

Feedstock cost is generally the largest component of total cost for the
petrochemicals business.  Olefins plants with the flexibility to consume a wide
range of feedstocks are better able to maintain higher levels of profitability
during periods of changing energy and petrochemicals prices than olefins plants
that are restricted in their feedstock processing capability.  The primary
feedstocks used in the production of olefins are natural gas liquids feedstocks
including ethane, propane and butane (collectively "NGLs") and naphtha,
condensates and gas oils (collectively "Petroleum Liquids").  As of January 1,
1998, approximately 50 percent of domestic ethylene capacity was limited to NGL
feedstocks, and approximately 45 percent could process to some extent both NGLs
and Petroleum Liquids.  Petroleum Liquids have had a historical variable margin
advantage over ethane and propane.  The industry variable margin differential
between naphtha and ethane has typically been between one and four cents per
pound of ethylene.  Equistar has the capability to capture this differential at
the Channelview facility due to its feedstock flexibility.  The Channelview
facility is unusually flexible in that it can process 100 percent Petroleum
Liquids or up to 90 percent NGL feedstocks.  Equistar's three other olefins
facilities currently process only NGLs, however Equistar plans to upgrade the
LaPorte, Texas facility and to integrate the operation of the LaPorte and
Channelview facilities so that the LaPorte facility can process Petroleum
Liquids and its resulting byproducts can be processed at the Channelview
facility.

Equistar obtains a portion of its olefins feedstock requirements from LCR (NGLs,
naphtha and gas oil).  The remainder of its Petroleum Liquids requirements are
obtained under contracts or on the spot market from a variety of domestic and
foreign sources.  Equistar also purchases NGLs from a wide variety of domestic
sources.

In addition to producing its own ethylene, Equistar assumed certain agreements
of Millennium Petrochemicals for the purchase of ethylene from Gulf Coast
producers at market prices.  Ethylene purchase obligations under such contracts
will decline to zero by December 2000.

                                       7
<PAGE>
 
MARKETING, SALES AND DISTRIBUTION

Ethylene produced by the LaPorte, Morris and Clinton facilities generally is
consumed as feedstock by Equistar polymers operations at those sites.  The
Channelview facility supplies significant amounts of ethylene to Equistar's
Pasadena, Texas facility via pipeline and to the Victoria and Matagorda
facilities via exchange arrangements.  Overall, currently approximately 75
percent of Equistar's sales of ethylene are to its polymers segment.
Intersegment sales are made at prices based on current market prices.

With respect to sales to third parties, Equistar sells a majority of its olefins
products to customers with whom Lyondell had long-standing relationships.  Sales
to third parties generally are made pursuant to written agreements which
typically provide for monthly negotiation of price.  The parties are
contractually committed to monthly price terms.  Nonetheless, in some cases, if
the parties fail to agree on a monthly price, deliveries may be suspended for
the month.  The contracts typically require the customer to purchase a specified
minimum quantity.  Contract terms are typically three to six years with
automatic one or two year term extension provisions.  Some contracts are subject
to early termination if deliveries have been suspended for several months.

Equistar sells most of its aromatics production under contracts that have
initial terms ranging from two to three years and that typically contain
automatic one year term extension provisions.  These contracts generally provide
for monthly or quarterly price adjustments based upon current market prices.
Aromatics produced at the Refinery, with the exception of benzene, are marketed
by Equistar for LCR under contracts with similar terms to its own.  Benzene
produced at the Refinery is sold directly to Equistar at market-related prices.

Equistar licenses MTBE technology from a third party and sells a significant
portion of MTBE produced at one of its two Channelview units to such party at
market-based prices.  The production from the second unit is consumed by LCR for
gasoline blending.  In addition, Equistar has entered into a joint development
and licensing arrangement to accelerate commercialization of two isomerization
processes that produce feedstocks for MTBE and tertiary amyl methyl ether
("TAME") which are blending components for reformulated gasoline.

Most of the ethylene and propylene production of the Channelview facility is
shipped via an extensive pipeline system which has connections to numerous Gulf
Coast ethylene and propylene consumers.  The pipeline system is owned by a third
party, and substantially all of it is leased by Equistar under long-term leasing
arrangements. Equistar also owns pipelines, operated by a third party, that are
connected to its LaPorte facilities and certain of its customers.  Equistar
leases other pipelines from other third parties and has exchange agreements with
other olefins producers which allow access to customers who are not directly
connected to its pipeline systems.  Some propylene is shipped by ocean-going
vessel.  Butadiene, aromatics and other petrochemicals are distributed by
pipeline, railcar, truck, barge or ocean-going vessel.

COMPETITION AND INDUSTRY CONDITIONS

The basis for competition in Equistar's petrochemicals products is product
quality, product deliverability, customer service and price.  Equistar competes
with other large domestic producers of petrochemicals, including Amoco Chemical
Company, Chevron Chemical Company, Dow Chemical Company, Exxon Chemical Company,
Huntsman Chemical, Mobil Chemical Company, Phillips Petroleum Company, Shell
Chemical Company and Union Carbide Company.

The combined rated capacity of Equistar's olefins units at January 1, 1998 was
approximately 7.7 billion pounds of ethylene per year or approximately 12
percent of total North American production capacity.  Based on published rated
production capacities, the Company believes that Equistar is the largest
producer of ethylene in North America.  North American industry ethylene rated
capacity at January 1, 1998 was approximately 64 billion pounds per year.  Of
the total ethylene production capacity in the United States, approximately 95
percent is located along the Gulf Coast, and approximately 75 percent is owned
by nine manufacturers.

Petrochemicals profitability is affected by the level of demand for
petrochemicals and derivatives, including exports throughout the world, along
with vigorous price competition among producers which may intensify due to,
among other things, the addition of new capacity.  In general, weak economic
conditions either in the United States or in the world and higher feedstock
costs tend to reduce demand and put pressure on margins.  Capacity additions in
excess of annual

                                       8
<PAGE>
 
growth also put pressure on margins.  It is not possible to predict accurately
the changes in feedstock costs, market conditions and other factors which will
affect petrochemical industry margins in the future.

The petrochemicals industry historically has experienced significant volatility
in supply and demand.  Historically, as a producer of olefins primarily for
merchant supply to unaffiliated customers, Lyondell had typically experienced
greater variations in its sales volumes and profitability when industry supply
and demand relationships are at extremes in comparison to more integrated
competitors, i.e., those with a higher proportion of captive demand for olefins
derivatives production.  However, Equistar currently sells approximately 75
percent of its ethylene production to Equistar's downstream polymers facilities,
which has the effect of reducing historical volatility.

Equistar's other major commodity chemical products also experience cyclical
market conditions similar to (although not necessarily coincident with) those of
ethylene.

CAPITAL PROGRAM

Lyondell's fixed asset capital expenditures for its petrochemical segment for
the first eleven months of 1997, together with such expenditures by Equistar
during December 1997, totaled $34 million.  The capital budget for Equistar's
petrochemicals segment for 1998 is $113 million which includes initial spending
for conversion of the LaPorte facility to process a higher percentage of
Petroleum Liquids.  It is expected that these capital needs will be internally
funded by Equistar.

As part of its ongoing operations, Equistar periodically conducts maintenance
turnarounds on its facilities. Although turnarounds on principal facilities are
usually scheduled well in advance, the timing of such turnarounds can be
accelerated or delayed because of numerous factors, some of which are beyond the
Equistar's control.

EQUISTAR POLYMERS SEGMENT

OVERVIEW

Through twelve facilities located in four states, Equistar's polymers segment
manufactures a wide variety of polyolefins, including various polyethylenes and
polypropylene and performance polymers.

Equistar currently manufactures polyethylene using a variety of technologies at
six facilities in Texas and at its Morris, Illinois and Clinton, Iowa
facilities.  The Morris and Clinton facilities are the only petrochemical
industry polyethylene facilities located in the Midwest and enjoy a freight cost
advantage over Gulf Coast producers in delivering products to customers in the
Midwest and on the East Coast of the United States.  Polyethylenes are used in a
wide variety of consumer products, packaging materials and industrial
applications, as described more fully in the following table.

The Morris and Pasadena facilities manufacture polypropylene using propylene
produced as a co-product of Equistar's ethylene production as well as propylene
purchased from third parties.  Polypropylene is sold for various applications in
the automotive, housewares and appliance industries.  Equistar also produces
performance polymer products, which include enhanced grades of polyethylene and
polypropylene, at several of its polymers facilities.  The Company believes
that, over a business cycle, average selling prices and profit margins for
performance polymers tend to be higher than selling prices and profit margins
for higher-volume commodity polyethylenes.  Equistar produces concentrates and
compounds at its facilities in Crockett, Texas, Fairport Harbor, Ohio and Heath,
Ohio.  Concentrates and compounds are polyethylene compounds impregnated with
additives and/or pigments and sold to converters who mix the compounds with
larger volumes of polymers, including polyethylene, to produce various products.

                                       9
<PAGE>
 
The following table outlines Equistar's polymers and performance polymers
products, annual capacity, the primary uses for such products and Equistar brand
names:
<TABLE>
<CAPTION>
 
                                                    
- ----------------------------------------------------------------------------------------------------------------------------------- 

                                       RATED                      
PRODUCT                                CAPACITY (a)  PRIMARY USES                                              BRAND NAMES 
- -------                                ------------  -------------                                             -----------
- ----------------------------------------------------------------------------------------------------------------------------------- 

<S>                                    <C>           <C>                                                       <C>
POLYETHYLENE AND POLYPROPYLENE
- ----------------------------------------------------------------------------------------------------------------------------------- 

HIGH DENSITY POLYETHYLENE (HDPE)       3.4 billion   Grocery, merchandise and trash bags; food containers      ALATHON/(R)/
                                       pounds (b)    for items from frozen desserts to margarine; caps and     Petrothene/(R)/
                                                     closures; liners for boxes of cereal and crackers;
                                                     plastic drink cups and toys; dairy crates; bread trays
                                                     and pails for items from paint to fresh fruits and
                                                     vegetables; safety equipment such as hard hats; house
                                                     wrap for insulation; bottles for household/industrial
                                                     chemicals and motor oil; milk/water/juice bottles;
                                                     large (rotomolded) tanks for storing liquids like
                                                     agricultural and lawn care chemicals
- ----------------------------------------------------------------------------------------------------------------------------------- 

LOW DENSITY POLYETHYLENE (LDPE)        1.7 billion   Food packaging films; plastic bottles for packaging       Petrothene/(R)/
                                       pounds        food and personal care items; dry cleaning bags; ice      Acrythene/(R)/ (EMA)
                                                     bags; pallet shrink wrap; heavy-duty bags for mulch and   Ultrathene/(R)/ (EVA)

                                                     potting soil; boil-in-bag bags; coatings on flexible
                                                     packaging products; coating on paper board such as milk
                                                     cartons.  Specialized forms of LDPE are Ethyl Methyl
                                                     Acrylate (EMA), which provides adhesion in a variety of
                                                     applications, and Ethylene Vinyl Acetate (EVA), which
                                                     is used in foamed sheets, bag-in box bags, vacuum
                                                     cleaner hoses, medical tubing, clear sheet protectors,
                                                     flexible binders.
- ----------------------------------------------------------------------------------------------------------------------------------- 

LINEAR LOW DENSITY POLYETHYLENE        1.1 billion   Garbage/lawn-leaf bags; housewares; lids for coffee       Petrothene/(R)/
 (LLDPE)                               pounds        cans, margarine tubs; large (rotomolded) toys like
                                                     outdoor gym sets.
- ----------------------------------------------------------------------------------------------------------------------------------- 

POLYPROPYLENE                          680 million   Fibers for carpets, rugs, upholstery; housewares;         KromaLon/(R)/
                                       pounds        automotive battery cases; automotive fascia, running      Petrofil/(R)/
                                                     boards, bumpers; grid-type flooring for sports            Petrothene/(R)/
                                                     facilities; fishing tackle boxes; bottle caps and         KromaLux/(R)/
                                                     closures.                                                 KromaTex/(R)/
                                                                                                               Flexathene/(R)/
- ----------------------------------------------------------------------------------------------------------------------------------- 

</TABLE> 
 
____________
 
(a)  The term "rated capacity," as used in this table is defined on page 6.
     
(b)  Equistar has undertaken a debottleneck project at its Victoria Facility
     that will expand the plant's HDPE capacity by approximately 125 million
     pounds and is scheduled to be completed in late 1998. A 480 million pound
     HDPE resin expansion project at the Matagorda facility has a targeted start
     up of third quarter 1999.

                                       10
<PAGE>
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------------- 

                        RATED                      
PRODUCT                 CAPACITY (a)  PRIMARY USES                                              BRAND NAMES 
- -------                 ------------  -------------                                             -----------
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>           <C>                                                       <C>
PERFORMANCE POLYMERS
- -----------------------------------------------------------------------------------------------------------------------------------
WIRE AND CABLE          (c)           Insulation and jacketing resins and compounds for         Petrothene/(R)/
RESINS AND                            automotive wiring, telecommunications and power      
 COMPOUNDS                            cable, and electronics and computer wiring.          
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                           
POLYMERIC               (c)           Component product in structural and bulk molding          Microthene/(R)/
 POWDERS                              compounds, parting agents and filters for appliance, 
                                      automotive and plastics processing industries.       
                                                                                           
                                                                                           
- -----------------------------------------------------------------------------------------------------------------------------------
CONCENTRATES AND        (c)           Provides: color in film, bottles, foam sheet; the         Spectratech/(R)/
 COMPOUNDS                            "slip"                                               
                                      that keeps film from sticking together; flame        
                                      retardancy; resistance to UV radiation; the "gas     
                                      bubbles" to make foamed plastic products.            
- -----------------------------------------------------------------------------------------------------------------------------------
POLYMERS FOR            (c)           Component in hot-metal-adhesive formulations for     
 ADHESIVES,                           case, carton and beverage package sealing, glue           Petrothene/(R)/
 SEALANTS AND                         sticks, automotive sealants, carpet backing and           Ultrathene/(R)/
 COATINGS                             coextruded adhesive labels.                          
- -----------------------------------------------------------------------------------------------------------------------------------
REACTIVE                (c)           Functionalized polymers used to bond non-polar and        Plexar/(R)/
 POLYLEFINS                           polar substrates in barrier food packaging, wire and 
                                      cable insulation and jacketing, automotive gas tanks 
                                      and metal coating applications.                      
- -----------------------------------------------------------------------------------------------------------------------------------
LIQUID                  (c)           A diesel fuel additive to inhibit freezing.               Vynathene/(R)/L
 POLYOLEFINS
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

____________

(c) These are enhanced grades of polyethylene and are included in the capacity
    figures for LDPE, HDPE and LLDPE above, as appropriate.

Research and development for Equistar's polymers segment is conducted in
laboratories at its Cincinnati, Ohio facility and at pilot plants in Matagorda,
Texas and Morris, Illinois. These facilities provide product and process
technology support for polymers operations and its customers.  See "-- RESEARCH
AND TECHNOLOGY; PATENTS AND TRADEMARKS."

FEEDSTOCKS

The polymers operations at the Morris, Clinton and LaPorte facilities receive
their primary supply of ethylene from the upstream petrochemicals facilities
located at those sites.  The ethylene and propylene converted at the Pasadena
facility are supplied by the Channelview facility either directly or via
exchange arrangements.  Equistar supplies from its own production the majority
of the ethylene consumed by the Victoria and Matagorda facilities via exchange
arrangements.  The Port Arthur, Texas facility receives its ethylene via
pipeline from Equistar and third parties.

MARKETING, SALES AND DISTRIBUTION

Equistar's polymers products are primarily sold to an extensive base of
established customers, many under term contracts, typically having a duration of
one to three years.  The remainder is generally sold without contractual term
commitments.  In either case, in most of the continuous supply relationships,
prices are subject to change upon mutual agreement between Equistar and the
customer.

                                       11
<PAGE>
 
Polymers are primarily distributed via railcar.  Equistar owns or leases,
pursuant to long-term lease arrangements, approximately 7,000 railcars for use
in its polymers business.  Equistar sells its polymers products in the United
States primarily through its own sales organization.  It generally engages sales
agents to market its products in the rest of the world.

COMPETITION AND INDUSTRY CONDITIONS

The basis for competition in Equistar's polymers products is product
performance, product quality, product deliverability, customer service and
price.  Equistar competes with other large producers of polymers, including
Chevron Chemical Corporation, Dow Chemical Company, Eastman Chemical Company,
Exxon Chemical Company, Fina, Formosa Plastics, Huntsman Chemical Company, NOVA
Corporation, Phillips Petroleum Company, Solvay Polymers, Union Carbide Company
and Westlake Polymers.  Polymers profitability is affected by the level of
demand for polymers, including exports throughout the world, along with vigorous
price competition which may intensify due to, among other things, new domestic
and foreign industry capacity.  In general, weak economic conditions either in
the United States or in the world tend to reduce demand and put pressure on
margins.  It is not possible to predict accurately the changes in feedstock
costs, market conditions and other factors which will affect polymers industry
margins in the future.

Based on published rated industry capacities, Equistar is the largest producer
of polyethylene in the world, and is a leading domestic producer of polyolefin
powders, compounds, wire and cable resins, and polymers for adhesives. The
combined rated capacity of Equistar's polyethylene units as of January 1, 1998,
was approximately 6.2 billion pounds per year, or approximately 18% of total
North American production capacity. There are 19 other North American producers
of polyethylene, including Exxon, Dow, Chevron, Phillips, Union Carbide and
Solvay. Equistar's polypropylene capacity, 680 million pounds per year as of
January 1, 1998, represents just under 5% of the total North American
polypropylene capacity. There are 12 other North American competitors in the
polypropylene business, including Montell, Exxon, Amoco and Fina.

CAPITAL PROGRAM

Lyondell's fixed asset capital expenditures for its polymers segment for the
first eleven months of 1997, together with such expenditures by Equistar during
December 1997 totaled $17 million.  The capital budget for Equistar's polymers
segment for 1998 is $87 million which includes the debottleneck at the Victoria
facility and expansion of HDPE capacity at the Matagorda facility.  It is
expected that these capital needs will be internally funded by Equistar.

As part of ongoing operations, maintenance turnarounds are periodically
conducted on facilities. Although turnarounds on principal facilities are
usually scheduled well in advance, the timing of such turnarounds can be
accelerated or delayed because of numerous factors, some of which are beyond
Equistar's control.

AGREEMENTS BETWEEN LYONDELL AND EQUISTAR

Lyondell and Equistar entered into an agreement on December 1, 1997, providing
for the transfer of assets to Equistar.  Among other things, such agreement sets
forth representations and warranties by Lyondell with respect to the transferred
assets and requires indemnification by Lyondell with respect thereto.  Such
agreement also provides for the assumption by Equistar of, among other things,
third party claims that are related to certain pre-closing contingent
liabilities that are asserted prior to December 1, 2004 to the extent the
aggregate thereof does not exceed $7 million, third party claims related to pre-
closing contingent liabilities that are asserted after December 1, 2004, certain
obligations for indebtedness, liabilities for products sold after December 1,
1997 regardless of when manufactured and certain long term liabilities.
Millennium Petrochemicals entered into a similar agreement with Equistar with
respect to the transfer of its assets and assumption of liabilities.

Also in connection with the formation of Equistar, Lyondell contributed a
promissory note for $345 million payable to Equistar.  The note matures on the
earlier of December 1, 2000 or the occurrence of a refinancing of LCR which
results in the repayment of LCR's $450 million construction loan and a
distribution to Lyondell of at least $345 million.  Lyondell currently
anticipates that such refinancing and distribution will occur during the second
quarter of 1998.

                                       12
<PAGE>
 
If Lyondell or Millennium or any of their affiliates desires to initiate or
pursue an opportunity to undertake, engage in, acquire or invest in a business
or activity or operation within the scope of the business of Equistar, such
opportunity must be offered to Equistar.  Equistar has certain options to
participate in such opportunity but if it determines not to participate, the
party offering the opportunity is free to pursue it on its own.  If the
opportunity within Equistar's scope of business constitutes less than 25% of an
acquisition that is otherwise not within the scope of the business of Equistar,
Lyondell or Millennium, as the case may be, may make such acquisition provided
that after such acquisition, the portion within the scope of the business of
Equistar is offered to Equistar pursuant to the foregoing provisions.

Lyondell has agreed to provide certain administrative services to Equistar,
including certain treasury services, tax services and employee benefit plan
administration. Equistar has also agreed to provide certain services to
Lyondell, such as health safety and environmental services, human resource
services, information services and legal services. As a consequence of services
being provided by Equistar to Lyondell and by Lyondell to Equistar, a net
payment is made by Equistar to Lyondell with respect thereto of approximately
$90,000 per month. Equistar and Millennium Petrochemicals are also parties to a
number of agreements for the provision of services, utilities and materials from
one party to the other at common locations, principally LaPorte and Cinncinnati.

Lyondell and Millennium each entered into a Master Intellectual Property
Agreement with Equistar.  The Master Intellectual Property Agreements provide
for (i) the transfer of certain intellectual property of Lyondell and Millennium
related to the businesses each contributed to Equistar, (ii) certain
irrevocable, perpetual, royalty free, nonexclusive, worldwide rights and
licenses to Equistar with respect to intellectual property retained by Lyondell
or Millennium that was not solely related to the business of Equistar but is
useful in such business and (iii) certain licenses from Equistar to Lyondell and
Millennium, respectively, with respect to intellectual property transferred to
Equistar that Lyondell and Millennium may use with respect to their other to
businesses.

Lyondell, Millennium and Equistar are parties to a Parent Agreement dated
December 1, 1997, which provides that, among other things, each of Lyondell and
Millennium guarantees the performance by their respective subsidiaries under
various agreements entered into in connection with the formation of Equistar,
including the Partnership Agreement and the asset transfer agreements providing
for the transfers of asset by Lyondell and Millennium, respectively, to
Equistar.

                                       13
<PAGE>
 
PROPERTIES

Equistar's principal manufacturing facilities and principal products are set
forth in the following table:
<TABLE>
<CAPTION>
 
Location                       Principal Products      Owned or Leased
<S>                        <C>                         <C>
 
Channelview, Texas (a)...  Ethylene                    Owned
 
                           Propylene
 
                           Butadiene
 
                           Benzene
 
                           Toluene
 
                           DCPD
 
                           Isoprene
 
                           Resin oil
 
                           Piperylenes
 
                           Alkylate
 
                           MTBE
 
Chocolate Bayou, Texas...  HDPE                        Leased
 
Crockett, Texas..........  Wire & cable compounds,     Owned
                           additive concentrates
                           and compounds
 
LaPorte, Texas...........  Ethylene                    Owned
 
                           LDPE
 
                           LLDPE
 
                           HDPE
 
Matagorda County, Texas..  HDPE                        Owned
 
Pasadena, Texas..........  Polypropylene               Owned
 
                           LDPE
 
Port Arthur, Texas.......  LDPE                        Owned
 
                           HDPE
 
Victoria, Texas..........  HDPE                        Leased
 
Morris, Illinois.........  Ethylene                    Owned

                           LDPE
 
                           LLDPE
 
                           Polypropylene
 
Tuscola, Illinois........  Ethyl alcohol               Owned
                           Diethyl ether
                           Compounds for wire & cable
                           Polymeric powders
 
Clinton, Iowa............  Ethylene                    Leased (b)
 
                           LDPE
 
                           HDPE
 
Fairport Harbor, Ohio....  Wire & cable compounds,     Leased
                           concentrates
 
Heath, Ohio..............  Compounds, additive and     Owned
                           foam concentrates,
                           performance compounds
 
Anaheim, California......  Denatured alcohol           Owned
 
Newark, New Jersey.......  Denatured alcohol           Owned
</TABLE>

_____________
(a) Lyondell Methanol owns a methanol plant located within the Channelview
    facility on property Lyondell Methanol leases from Equistar.  A third party
    owns and operates a facility on land leased from Equistar that is used to
    purify hydrogen from Lyondell Methanol's methanol plant. Equistar also
    operates a styrene maleic anhydride unit and a polybutadiene unit which are
    owned by a third party and are located on property leased from Equistar
    within the Channelview facility.

(b) Leased subject to industrial revenue bonds.  Equistar has an option to
    purchase the property.

                                       14
<PAGE>
 
Equistar also owns a storage facility, a brine pond facility and a tract of
vacant land at Mont Belvieu, Texas, located approximately 15 miles east of the
Channelview facility.  Storage capacity for up to approximately 13 million
barrels of NGL feedstocks, ethylene, propylene and other hydrocarbons is
provided in salt domes at the Mont Belvieu facility.

Equistar owns several pipelines connecting the Channelview facility, the
Refinery and the Mont Belvieu facility, including six lines used to transport
liquid feedstocks, butylenes, benzene, hydrogen, butane, MTBE and unfinished
gasolines between the Channelview facility and the Refinery.  Equistar also owns
other pipelines in connection with its Morris, Clinton and La Porte facilities.
Equistar also owns a barge docking facility near the Channelview facility
capable of berthing eight barges and related terminal equipment for loading and
unloading.  Equistar owns or leases pursuant to long-term lease arrangements
approximately 7,000 railcars for use in its polymers business.

Equistar leases its executive offices and corporate headquarters from Lyondell
in downtown Houston.  In addition, Equistar owns facilities which house the
Morris and Cincinnati research operations.  Equistar also leases storage
facilities from various third parties for the handling of products, primarily in
the Gulf Coast area.

RESEARCH AND TECHNOLOGY; PATENTS AND TRADEMARKS

Equistar maintains a significant research and development facility in
Cincinnati, Ohio.  The Cincinnati facility features more than 30 plastics
processing lines, all of commercial or semi-commercial size, allowing Equistar
engineers and technicians to evaluate polyolefin products under conditions
similar to a customer's plant.  Equistar has additional research facilities in
Morris.  Product development efforts are aimed at tailoring products to meet
specific customer needs.

The Channelview facility employs a proprietary technology owned by Lyondell, the
PRODFLEX technology, that converts ethylene and other light petrochemical
streams into propylene.  In addition, the olefins facilities can upgrade
butylene into higher-value products such as MTBE and alkylates used in the
production of automotive fuels.  Equistar is conducting a research project to
investigate alternative feedstocks for use at the Channelview facility.

Recent polymers industry announcements relate to the development of metallocene,
or single-site, catalysts.  Successful development and commercialization of
these catalysts are expected to result in enhanced polymer properties.  Equistar
is conducting a broad search to evaluate outside technology and is concentrating
in-house research in an effort to identify and develop single-site catalysts for
use in the production of polyolefins resins.  Equistar holds several U.S.
patents and the rights to certain patents pending in connection with research
and development efforts in this area.

Equistar uses numerous technologies in its operations, many of which are
licensed from third parties.   Significant licenses held by Equistar include the
BP Chemicals fluid bed polyethylene process for the production of both LLDPE and
HDPE, the Unipol process for the production of LLDPE, and certain processes for
the production of polyethylene and polypropylene.  Several new patent
applications to protect newly-developed technologies were submitted by Lyondell
and Millennium Petrochemicals during 1997 which were assigned to Equistar in
connection with its formation.

Equistar acquired rights to numerous recognized brand names from Lyondell and
Millennium Petrochemicals in connection with its formation, including
ALATHON/(R)/, KromaLon/(R)/, Petrothene/(R)/, Ultrathene/(R)/, Vynathene/(R)/
and Microthene/(R)/.  Equistar is not dependent upon any particular trademark,
and it believes the loss of any individual trademark would not have a material
adverse effect on its operations.

EMPLOYEE RELATIONS

As of December 31, 1997, Equistar employed approximately 4,000 full-time
employees.  Equistar also uses the services of independent contractors in the
routine conduct of its business.  Approximately 335 hourly workers are covered
by collective bargaining agreements.

                                       15
<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.

OVERVIEW

Lyondell participates in petroleum refining through an equity interest in LCR.
As a result of the completion of the Upgrade Project in the first quarter of
1997, Lyondell holds a 58.5 percent interest and CITGO holds a 41.5 percent
interest in LCR.  The Refinery is located adjacent to the Houston Ship Channel
in Pasadena, Texas.  The Refinery's products include conventional and
reformulated gasoline, low sulfur diesel, jet fuel, aromatics, lubricants
(industrial lubricants, motor oils, white oils and process oils), carbon black
oil, sulfur, residual fuel and petroleum coke.  Aromatics are used to
manufacture a variety of intermediate chemicals, including ethylbenzene, cumene,
urethane foam components and polyester intermediates for films, fibers and
resins.  End uses of these products include packaging and containers, furniture,
apparel and flooring.

LCR was formed in 1993 to upgrade the Refinery's ability to process substantial
additional volumes of lower cost, very heavy crude oil.  In connection with its
formation, LCR entered into a long-term crude supply contract ("Crude Supply
Contract") with Lagoven, S.A., now known as PDVSA Petroleo y Gas S.A. ("PDVSA
Oil"), an affiliate of CITGO.  In addition, under the terms of a long-term
product sales agreement ("Products Agreement"), CITGO purchases from LCR
substantially all of the refined products produced at the Refinery.  Both PDVSA
Oil and CITGO are direct or indirect wholly owned subsidiaries of Petroleos de
Venezuela, S.A. ("PDVSA"), the national oil company of Venezuela.

LCR BUSINESS STRATEGY

LCR's strategies include seeking to:

 . Lower cost structure and improve operating efficiency by focusing on:
     .  Maximizing equipment reliability
     .  Improving cost structure with the objective of being in the top quartile
        of the industry
     .  Implementing shared services plan to outsource staff functions to
        Lyondell and CITGO
     .  Improving yields to gain greater efficiency
     .  Working to maintain and improve product qualities to meet new industry
        standards

 . Increasing margins by:
     .  Selectively investing to increase the volumes of heavy crude oil
        processed in the coking mode

UPGRADE PROJECT

The Upgrade Project has increased the heavy crude oil processing capability of
the Refinery from 130,000 barrels per day of 22 degree API gravity crude oil to
approximately 250,000 barrels per day of 17 degree API gravity crude oil.  The
Upgrade Project has improved the Refinery's ability to process heavier, higher
margin, crude oils. The 17 degree API gravity crude oil is more viscous and
dense than traditional crude oil and contains higher concentrations of sulfur
and heavy metals, making it more difficult to refine into gasoline and other
high value fuel products but less costly to purchase.  With the completion of
the Upgrade Project, more than 90 percent of the crude oil purchases are made
pursuant to the Crude Supply Contract which significantly reduces the crude oil
volume which is sensitive to market conditions.  The Upgrade Project also
included expansion of the Refinery's reformulated gasoline and low sulfur diesel
production capability.  The earnings potential of LCR has also been enhanced due
to the higher margins associated with LCR's increased coking capability,
enhanced reformulated fuels and low sulfur diesel production capability and
other yield improvements.

The Upgrade Project, which cost approximately $1.1 billion, was funded through a
combination of approximately $486 million in capital contributions to LCR by
CITGO (including cash contributions for financing costs and reinvestment of
operating cash distributions), a $450 million construction loan credit facility
(the "Construction Facility") provided by a group of banks, and $166 million and
$16 million, in subordinated loans to LCR from Lyondell and CITGO, respectively.

                                       16
<PAGE>
 
In exchange for CITGO's Upgrade Project capital contributions, together with an
additional $130 million in equity contributions CITGO had previously made to
LCR, CITGO's participation interest in LCR increased to 41.5 percent, effective
April 1, 1997.  CITGO has a one-time option to increase its participation
interest in LCR up to 50 percent by making an additional equity contribution.

1998 REFINANCING

LCR's indebtedness is scheduled to be refinanced in the second quarter of 1998.
In connection therewith, the Company anticipates that LCR would repay the
Construction Facility and make cash distributions to Lyondell, including
repayment of debt, of approximately $400 to $600 million.  Lyondell will use
such amount, in part, to repay Lyondell's $345 million note payable to Equistar.
See "EQUISTAR CHEMICALS, LP--Agreements between Lyondell and Equistar".

MANAGEMENT OF LCR

LCR is a limited liability company organized under the laws of the state of
Texas and has pass-through tax characteristics similar to those of a partnership
for federal income tax purposes.  The Company owns its interest in LCR through a
wholly owned subsidiary, Lyondell Refining Company.  CITGO holds its interest
through CITGO Refining Investment Company, a wholly owned subsidiary of CITGO
(together with Lyondell Refining Company, "the Owners"). The operative agreement
with respect to the rights of each of the Owners and their parent companies is
the Amended and Restated Limited Liability Company Regulations ("Regulations")
of LCR.  The Regulations govern, among other things, ownership and cash
distribution rights. Under the terms of a reciprocal Performance Guarantee and
Control Agreement, Lyondell and CITGO each unconditionally guarantee the
obligations and performance of their respective subsidiary-Owner under the terms
of the Regulations.

The Regulations provide that LCR is managed by an Owners Committee, which has
three representatives ("Representatives") from each Owner.  Actions requiring
unanimous consent of the Representatives, include, without limitation, amendment
of the Regulations, borrowing money in excess of LCR's existing credit
facilities, delegations of authority to committees, certain purchase commitments
and capital expenditures in excess of designated amounts and budgetary approval.
The day-to-day operations of the Refinery are managed by the executive officers
of LCR.

FEEDSTOCKS

LCR is required to purchase, and PDVSA Oil is required to sell, sufficient crude
oil to satisfy LCR's coking capacity, or a minimum of 200,000 and up to 230,000
barrels per day of very heavy Venezuelan crude oil.  PDVSA Oil has the right,
but not the obligation, to supply incremental amounts above 230,000 barrels per
day.

The Crude Supply Contract incorporates a formula price based on the market value
of a slate of refined products deemed to be produced from each particular crude
oil or feedstock, less: (i) certain deemed refining costs, adjustable for
inflation and energy costs; (ii) certain actual costs, including crude
transportation costs, import duties and taxes; and (iii) a deemed margin, which
varies according to the grade of crude oil or other feedstock delivered.  Deemed
margins and deemed costs are adjusted periodically.  These adjustments are based
on inflation rates and energy costs, however, deemed margin adjustments can be
less than the rate of inflation.  Because deemed operating costs and the slate
of refined products deemed to be produced from a given barrel of crude oil or
other feedstock do not necessarily reflect the actual costs and yields in any
period and also because the market value of the refined products used in the
pricing formula does not necessarily reflect the actual price received for the
refined products, the actual refining margin earned by LCR under the Crude
Supply Contract will vary depending on, among other things, the efficiency with
which LCR conducts its operations during such period.

There are risks associated with enforcing the provisions of contracts with an
affiliate of a foreign government such as PDVSA Oil.  These risks include
enforcing judgments of United States courts against entities whose assets are
located outside of the United States and whose management does not reside in the
United States. Depending on current market conditions, breach or termination of
the Crude Supply Contract could adversely affect the Company.  For example, the
parties have negotiated alternative arrangements in the event of certain force
majeure conditions, including governmental or other actions restricting or
otherwise limiting PDVSA Oil's ability to perform its obligations.  Any such
alternative arrangements may not be as beneficial as the Crude Supply Contract.
There can be no assurance that 

                                       17
<PAGE>
 
alternative crude oils with similar margins would be available for purchase by
LCR. If LCR were required to return to the practice of purchasing all of its
crude oil feedstocks in the merchant market, LCR would again be subject to
significant volatility and price fluctuations. However, the Company believes
that this transaction holds substantial economic and other incentives for all
parties to perform their obligations. Lyondell believes PDVSA's strategic
interest in expanding its crude oil refining operations in the United States in
order to increase the markets for its heavy crude oil and continued financial
commitments of CITGO should provide an economic incentive for all PDVSA
affiliates to perform their obligations under the various agreements.

MARKETING AND SALES

The Refinery produces gasoline, low sulfur diesel, jet fuel, aromatics,
lubricants and certain industrial products.  On a weekly basis, LCR evaluates
and determines the optimal product output mix for the Refinery, based on spot
market prices and conditions. Pursuant to the Products Agreement, CITGO
purchases all of the gasoline, low sulfur diesel and jet fuel manufactured at
the Refinery. These products are purchased by CITGO at market-based prices.  For
example, the price for gasoline is based on prices published by Platts Oilgram,
an industry trade publication. Aromatics extracted as part of the refining
process are marketed for LCR by Equistar.  With the startup of new and modified
hydrotreaters and sulfur plants, LCR is now producing all of its distillate as
low sulfur diesel fuel for sale as transportation fuel, a higher-valued product.
Blending facilities completed as part of the Upgrade Project enable LCR to
supply more than 70 percent of its gasoline capacity as higher-value
reformulated or oxygenated fuel.

Due to the increasingly competitive lubricants business, LCR elected to close
the base oils distillation units at the end of 1996 and now purchases lubricant
base stocks in the open market for blending into motor oils.  This eliminated
approximately 35,000 barrels per day of higher cost sweet crude oil previously
used in these units.  LCR expects to enter into an agreement with CITGO pursuant
to which CITGO will market LCR's production of naphthenic oil, white oil and
compounded oil.

AGREEMENTS BETWEEN LYONDELL, CITGO AND LCR

LCR is a party to a number of agreements with Lyondell and CITGO. Lyondell
currently performs administrative services for LCR pursuant to an Administrative
Services Agreement. Lyondell, CITGO and LCR are in the process of renegotiating
the terms of the Administrative Services Agreement.

AGREEMENTS BETWEEN EQUISTAR AND LCR

Prior to the formation of Equistar, Lyondell was a party with LCR to multiple
agreements designed to preserve much of the synergy between the Refinery and the
Channelview facility.  Such agreements, including the aromatics marketing
agreement described above under "--Marketing and Sales", were assumed by
Equistar from Lyondell effective December 1, 1997.  Economic evaluations at the
Channelview facility and the Refinery are based on sending products to the
highest-value disposition, which may be local use, use at the other site, or
third party sales.  Certain refinery products (propane, butane, low-octane
naphthas, heating oils, and gas oils) can be used as feedstocks for olefins
production, and certain Channelview facility olefins by-products can be
processed by the Refinery into gasoline.  Butylenes from the Refinery are tolled
through the Channelview facility for the production of alkylate and MTBE for
gasoline blending.  Hydrogen from the Channelview facility is used at the
Refinery for sulfur removal and product stabilization.

COMPETITION AND INDUSTRY CONDITIONS

All of LCR's gasoline, low sulfur diesel and jet fuel are sold to CITGO under
the Products Agreement.  LCR continues to sell lube oils directly to major
industrial consumers and through distributors in domestic and international
markets.

                                       18
<PAGE>
 
The refining business tends to be volatile as well as cyclical. Crude oil
prices, which are impacted by worldwide political events and the economics of
exploration and production in addition to refined products demand, are the
largest source of this volatility. Demand for refined products is influenced by
seasonal and short-term factors such as weather and driving patterns, as well as
by longer term issues such as energy conservation and alternative fuels.
Industry refined products supply is also dependent on industry operating
capabilities and on long-term refining capacity trends. However, management
believes that the combination of the Crude Supply Contract and the Products
Agreement has the effect of stabilizing future earnings and cash flows and
substantially reducing the market driven aspects of such volatility.

Among LCR's refining competitors are major integrated petroleum companies and
domestic refiners that are owned by or affiliated with major integrated oil
companies.  Based on published industry data, as of January 1, 1998, there were
163 crude oil refineries in operation in the United States, and total domestic
refinery capacity was approximately 16 million barrels per day.  During 1997,
LCR processed an average of 224,000 barrels per day of blended crude oil or over
one percent of domestic capacity.

CAPITAL PROGRAM

LCR's capital expenditures for additions to fixed assets (excluding spending of
$45 million on the Upgrade Project) totaled approximately $40 million in 1997.
LCR's capital budget for 1998 is approximately $66 million and is expected to be
funded by the owners, of which the Company is obligated to provide $38 million.
Of the total 1998 capital budget, approximately $15 million is expected to be
spent on environmentally-related capital projects.

As part of its ongoing operations, LCR periodically conducts maintenance
turnarounds on its facilities.  Although turnarounds on principal facilities are
usually scheduled well in advance, the timing of such turnarounds can be
accelerated or delayed because of numerous factors, some of which are beyond
LCR's control.

PROPERTIES

LCR owns the real property, plant and equipment which comprise the Refinery,
located on approximately 700 acres  in Houston, Texas.  Units include a fluid
catalytic cracking unit, cokers, reformers, crude distillation units, sulfur
recovery plants and hydrodesulfurization units, as well as lube oil
manufacturing and packaging facilities and an aromatics recovery unit.  LCR also
owns the real property, plant and equipment which comprise a lube oil blending
and packaging plant in Birmingport, Alabama.  LCR owns a pipeline used to
transport gasoline, kerosene and heating oil from the Refinery to the GATX
Terminal located in Pasadena, Texas to interconnect with common carrier
pipelines.

Equistar owns several pipelines connecting the Channelview facility, the
Refinery and the Mont Belvieu facility, including six lines used to transport
heavy liquid feedstocks, butylenes, benzene, hydrogen, butane, MTBE and
unfinished gasolines between the Channelview facility and the Refinery.

EMPLOYEE RELATIONS

At December 31, 1997, LCR employed approximately 1,300 full-time employees.  LCR
also uses the services of independent contractors in the routine conduct of its
business. Approximately 800 hourly workers are covered by a collective
bargaining agreement between LCR and the Oil, Chemical and Atomic Workers Union,
which expires in January 1999.

                                       19
<PAGE>
 
                        LYONDELL METHANOL COMPANY, L.P.

OVERVIEW

Lyondell produces methanol through its 75 percent interest in Lyondell Methanol,
of which Lyondell serves as the managing partner.  Effective December 1, 1997,
Equistar began serving as the operator of Lyondell Methanol pursuant to an
operating agreement with Lyondell Methanol.  The remaining 25 percent interest
in Lyondell Methanol is held by MCNIC.  Lyondell Methanol owns a methanol plant
located within the Channelview facility.  The methanol plant is a heat-
integrated plant, which includes extraction capabilities for co-products such as
hydrogen and fusel oil.

Methanol is used to produce MTBE and a variety of chemical intermediates,
including formaldehyde, acetic acid and methyl methacrylate.  These
intermediates are used to produce bonding adhesives for plywood as well as
polyester fibers and plastics.  Other end uses include solvents and antifreeze
applications.  Lyondell Methanol is advantageously located near Gulf Coast MTBE
producers.

LYONDELL METHANOL BUSINESS STRATEGY

Lyondell Methanol's strategic focus is on maintaining and improving efficient,
low cost operations.  Lyondell Methanol seeks to achieve this by reducing
feedstock costs, increasing contract sales, implementing cost reduction
technologies and techniques and maximizing the chemical efficiency of its
processes.

MANAGEMENT OF LYONDELL METHANOL

Lyondell Methanol is a limited partnership organized under the laws of the state
of Texas and is a pass-through entity for federal income tax purposes.  Lyondell
owns its interest in Lyondell Methanol through two wholly owned subsidiaries,
one of which serves as a general partner and the managing partner of Lyondell
Methanol and one of which serves as a limited partner.  Similarly, MCNIC owns
its interest in Lyondell Methanol through two wholly owned subsidiaries, one a
general partner and one a limited partner.

FEEDSTOCKS

Lyondell Methanol's  plant processes natural gas feedstocks.  Equistar is
connected to a diverse natural gas supply network and it purchases natural gas
for use as fuel at its Channelview facility, and sells natural gas to Lyondell
Methanol as a feedstock for the methanol plant.

MARKETING, SALES AND DISTRIBUTION

Substantially all of the methanol output from Lyondell Methanol is sold to
Equistar who then sells it to third parties.  The agreement between Lyondell
Methanol and Equistar concerning such sales generally provides that Lyondell
Methanol bears the market risk associated with such sales.  Equistar's
agreements with third parties for the sale of the methanol have initial terms
ranging from two to three years and that typically contain automatic one year
term extension provisions.  These contracts generally provide for monthly price
adjustments based upon current market prices.  Methanol is distributed by
pipeline, railcar, truck, barge or ocean-going vessel.

AGREEMENTS BETWEEN EQUISTAR AND LYONDELL METHANOL

Certain agreements entered into by Lyondell and Lyondell Methanol were assigned
to Equistar effective December 1, 1997.  Equistar acts as operator of Lyondell
Methanol pursuant to an operating agreement with Lyondell Methanol.  In
addition, Equistar sells natural gas to Lyondell Methanol and markets Lyondell
Methanol's product pursuant to agreements with Lyondell Methanol.  Lyondell
Methanol also leases from Equistar the real property on which its methanol plant
is located.

                                       20
<PAGE>
 
COMPETITION AND INDUSTRY CONDITIONS

The basis for competition in the methanol segment is product deliverability,
product quality and price. Lyondell Methanol competes with other large producers
of methanol, including Methanex, Borden Chemicals and Plastics and Terra
Industries.

The rated capacity of Lyondell Methanol's processing unit at January 1, 1998 was
248 million gallons.  Based on published rate production capacities, the Company
believes that Lyondell Methanol is the third largest methanol producer in the
United States.

Methanol profitability is affected by the level of  demand for products in which
methanol is used, including MTBE and plywood (the production of which involves
the use of formaldehyde), demand for which in turn is driven by the housing
market.  Methanol profitability is also affected by the price of its feedstock,
natural gas.

CAPITAL PROGRAM

The capital budget for Lyondell Methanol for 1998 is $13 million.  These capital
needs are expected to be funded by Lyondell Methanol's internal cash flow.
Lyondell Methanol's 1998 capital budget includes capital costs associated with
preparations for a turnaround expected to commence in the first quarter of 1999.

PROPERTIES

Lyondell Methanol's only property is the methanol plant it owns which is located
within Equistar's Channelview complex on property leased from Equistar.

EMPLOYEE RELATIONS

Lyondell Methanol has no employees, since Equistar serves as its operator and
marketing agent.


                   LYONDELL PROPERTY AND EMPLOYEE RELATIONS

Generally the Company's operations are conducted through Equistar, LCR and
Lyondell Methanol (which is operated by Equistar).  As of December 31, 1997,
Lyondell, excluding Equistar and LCR and Lyondell Methanol, employed
approximately 50 full-time employees.  Lyondell's only facility, excluding the
properties owned or leased by its joint ventures, is its leased corporate
offices located in Houston, Texas.


                             ENVIRONMENTAL MATTERS

The production facilities of Equistar, LCR and Lyondell Methanol are generally
required to have permits and licenses regulating air emissions, discharges to
water and generation, storage, treatment and disposal of hazardous wastes.
Companies such as Lyondell and its joint ventures that are permitted to treat,
store or dispose of hazardous waste and maintain underground storage tanks
pursuant to the Resource Conservation and Recovery Act ("RCRA") also are
required to meet certain financial responsibility requirements.  The Company
believes that its joint ventures have all permits and licenses generally
necessary to conduct its business or, where necessary, are applying for
additional, amended or modified permits and that it meets applicable financial
responsibility requirements.

The policy of each of Equistar, LCR and Lyondell Methanol is to be in compliance
with all applicable environmental laws. Equistar also is committed to
Responsible Care/(R)/, a chemical industry initiative to enhance the industry's
responsible management of chemicals.  The Company's joint ventures (together
with the industries in which they operate) are subject to extensive federal,
state and local environmental laws and regulations concerning emissions to the
air, discharges onto land or waters and the generation, handling, storage,
transportation, treatment and disposal of waste materials.  Some of these laws
and regulations are subject to varying and conflicting interpretations.  In
addition, the Company cannot accurately predict future developments, such as
increasingly stricter requirements of environmental laws, inspection and
enforcement policies and compliance costs therefrom, which might affect the
handling,

                                       21
<PAGE>
 
manufacture, use, emission or disposal of products, other materials or hazardous
and non-hazardous waste.  In particular, the ultimate effect of the Clean Air
Act on the  operations of the joint ventures will depend on how the law is
interpreted and implemented pursuant to regulations that are currently being
developed and on additional factors such as the evolution of environmental
control technologies.  Some risk of environmental costs and liabilities is
inherent in particular operations and products of the joint ventures, as it is
with other companies engaged in similar businesses, and there is no assurance
that material costs and liabilities will not be incurred. In general, however,
with respect to the capital expenditures and risks described above, the Company
does not expect that its joint ventures will be affected differentially from the
rest of the domestic petrochemicals and refining industry.

In some cases, compliance with environmental, health and safety laws and
regulations can only be achieved by capital expenditures.  In the years ended
December 31, 1997 and 1996, the Company and its joint ventures spent, in the
aggregate, approximately $13 million and $28 million, respectively, for
environmentally related capital expenditures at existing facilities.  In 1998,
the Company currently estimates that environmentally related capital
expenditures at existing joint venture facilities will be approximately $20
million.  The Company does not anticipate that environmentally related capital
expenditures at joint venture facilities in 1999 will be materially different
than for 1998.  The timing and amount of these expenditures are subject to the
regulatory and other uncertainties described above as well as obtaining of the
necessary permits and approvals.  For periods beyond 1999, additional
environmentally related capital expenditures will be required, although the
Company cannot accurately predict the levels of such expenditures at this time.

The Refinery contains on-site solid-waste landfills which were used in the past
to dispose of waste generated at this facility.  It is anticipated that
corrective measures will be necessary to comply with federal and state
requirements with respect to this facility. In addition, the Company negotiated
an order with the Texas Natural Resource Conservation Commission ("TNRCC") for
assessment and remediation of groundwater and soil contamination at the
Refinery. The Company is also responsible for a portion of the remediation of
certain off-site waste disposal facilities. The Company's policy is to accrue
remediation expenses when it is probable that such efforts will be required and
the related expenses can be reasonably estimated. Estimated costs for future
environmental compliance and remediation are necessarily imprecise due to such
factors as the continuing evolution of environmental laws and regulatory
requirements, the availability and application of technology, the identification
of presently unknown remediation sites and the allocation of costs among the
responsible parties under applicable statutes. The Company and its joint
ventures, to the extent appropriate, have reserved amounts (without regard to
potential insurance recoveries or other third party reimbursements) believed to
be sufficient to cover current estimates of the cost for remedial measures at
manufacturing facilities and off-site waste disposal facilities based upon their
interpretation of current environmental standards. In the opinion of management,
there is no material range of loss in excess of the amount recorded. Based on
the establishment of such reserves, and the status of discussions with
regulatory agencies described in this paragraph, and although the reserves are
subject to increase, the Company does not anticipate any material adverse effect
upon its financial statements or competitive position as a result of compliance
with the laws and regulations described in this or the preceding paragraphs. See
also Item 3 -- "Legal Proceedings" and Item 7 --"Management's Discussion and
Analysis of Financial Condition and Results of Operations".

ITEM 3.  LEGAL PROCEEDINGS

GENERAL

The Company, its subsidiaries and joint ventures are, from time to time,
defendants in lawsuits, some of which are not covered by insurance.  Many of
these additional suits make no specific claim for relief.  Although final
determination of legal liability and the resulting financial impact with respect
to any such  litigation cannot be ascertained with any degree of certainty, the
Company does not believe that any ultimate uninsured liability resulting from
the legal proceedings in which it currently is involved (directly or indirectly)
will individually, or in the aggregate, have a material adverse effect on the
business or financial condition of the Company.  See Note 20 of "NOTES TO
CONSOLIDATED FINANCIAL STATEMENTS".

Although Lyondell, its subsidiaries and joint ventures are involved in numerous
and varied legal proceedings, a significant portion of its outstanding
litigation arose in three contexts:  (1) claims for personal injury or death
allegedly arising out of exposure to the Company's products; (2) claims for
personal injury or death, and/or property damage allegedly arising out of the
generation and disposal of chemical wastes at Superfund and other waste disposal
sites; and

                                       22
<PAGE>
 
(3) claims for personal injury and/or property damage and air, noise and water
pollution allegedly arising out of  operations.

OTHER MATTERS

From time to time the Company receives notices from federal, state or local
governmental entities of alleged violations of environmental laws and
regulations pertaining to, among other things, the disposal, emission and
storage of chemical and petroleum substances, including hazardous wastes.
Although the Company has not been the subject of significant penalties to date,
such alleged violations may become the subject of enforcement actions or other
legal proceedings and may (individually or in the aggregate) involve monetary
sanctions of $100,000 or more (exclusive of interest and costs).

In July 1994, the Company reported results of an independent investigation
conducted by the Audit Committee of the Board of Directors regarding the
compliance status of two process waste water streams under the applicable
Benzene National Emissions Standard for Hazardous Air Pollutants ("NESHAPS")
regulations and certain issues raised by an employee.  Noncompliance with the
Benzene NESHAPS regulations and the related reporting requirements can result in
civil penalties and, under certain circumstances, substantial civil and,
potentially, criminal penalties.  The Company received a notice of violation
from the TNRCC regarding the two streams and paid a fine of $10,200.  In
addition, the Company incurred approximately $2 million in capital costs in
connection with these waste water streams to achieve on-going compliance with
the Benzene NESHAPS regulations.  The Criminal Enforcement Division of the EPA
opened a formal investigation in the first quarter of 1997 and interviewed
certain officials and other personnel of the Company, but has taken no action
since then.  The Company does not believe any aspects of the matters described
above will subject the Company to criminal liability or have a material adverse
effect on the financial condition or liquidity of the Company.

As a result of flooding during October 1994, three pipelines owned by Colonial
Pipeline and Texaco ruptured in the San Jacinto River flood plain, resulting in
explosions and fires.  As a result of the explosions and fires, the Company was
forced to shut down operations at its Channelview facility and destroy large
volumes of product.  The Company has filed suit seeking damages from Colonial
Pipeline and Texaco of $12.5 million for lost profits, destroyed product, and
repair costs.  Settlement in this matter has not been reached.  In June 1996,
the Company experienced a fire at its Mont Belvieu terminal due to a valve
malfunction.  The fire resulted in damage estimated at approximately $14 million
plus a before-tax impact on operating income of $2 million.  The Company has
filed suit seeking recovery of the loss from the valve manufacturer and
refurbisher.

                                       23
<PAGE>
 
                     EXECUTIVE OFFICERS OF THE REGISTRANT

Set forth below are the executive officers of Registrant as of March 1, 1998.*
<TABLE>
<CAPTION>
 
 
                                           BUSINESS EXPERIENCE DURING PAST
       NAME, AGE AND PRESENT               FIVE YEARS AND PERIOD SERVED AS
       POSITION WITH LYONDELL                         OFFICER(S)
- --------------------------------------  --------------------------------------
<S>                                     <C>
 
Clifton B. Currin, Jr., 43............  Mr. Currin was named Vice President,
Vice President,                         Corporate Development in December
 Corporate Development                  1997.  Mr. Currin has served as a
                                        Vice President of the Company since
                                        1994 with responsibilities in the
                                        areas of Strategic Development,
                                        Petrochemicals Business Management
                                        and Olefins.  Prior to 1994, Mr.
                                        Currin held positions in
                                        manufacturing, evaluations and
                                        marketing for the Company and for
                                        ARCO Products Company.
 
Kerry A. Galvin, 37...................  Ms. Galvin was named Chief Corporate
Chief Corporate Counsel                 Counsel and Secretary in December
and Secretary                           1997.  Prior thereto, Ms. Galvin
                                        served as Finance and Securities
                                        Counsel and Assistant Secretary.
 
Jeffrey R. Pendergraft, 49............  Mr. Pendergraft was named Senior Vice
Senior Vice President and Chief         President and Chief Administrative
 Administrative Officer                 Officer in December 1997.  He has
                                        served as a  Senior Vice President
                                        since May 1993.  In addition, Mr.
                                        Pendergraft has served as Vice
                                        President, General Counsel and
                                        Secretary since 1988.  Prior to 1988,
                                        Mr. Pendergraft served as General
                                        Attorney of the Lyondell Division and
                                        as attorney in various operating
                                        divisions and corporate units of ARCO.
 
Edward W. Rich, 47....................  Mr. Rich was named Vice President,
Vice President, Finance                 Finance and Treasurer in January
and Treasurer                           1998.  Previously, Mr. Rich served as
                                        Treasurer of Dow Corning Corporation
                                        from February 1993 to January 1998.
                                        Prior to February 1993, Mr. Rich held
                                        various financial and legal positions
                                        with The Dow Chemical Company.
 
Dan F. Smith, 51......................  Mr. Smith was named Chief Executive
President, Chief Executive Officer      Officer and President in December
and Director                            1996.  Mr. Smith has been a Director
                                        since 1988.  Mr. Smith served as
                                        President and Chief Operating Officer
                                        of the Company from 1994 to December
                                        1996.  Prior to 1994, Mr. Smith held
                                        various positions including Executive
                                        Vice President, Chief Financial
                                        Officer of the Company, Vice
                                        President, Corporate Planning of ARCO
                                        and Senior Vice President in the
                                        areas of management, manufacturing,
                                        control and administration for the
                                        Company and the Lyondell Division of
                                        ARCO.
 
 
</TABLE>
* The By-Laws of the Company provide that each officer shall hold office until
  the officer's successor is elected or appointed and qualified or until the
  officer's death, resignation or removal by the Board of Directors.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

A special meeting of stockholders was held November 20, 1997 to vote on the
Joint Venture Transaction (as defined in the Joint Proxy Statement dated October
17, 1997), which involved the combination of businesses by Lyondell and
Millennium in the form of Equistar.   65,729,436 shares voted for the Joint
Venture Transaction,  288,722 shares voted against or were withheld and 120,634
shares abstained.

                                       24
<PAGE>
 
                                    PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

The Common Stock is listed on the New York Stock Exchange.

The reported high and low sale prices of the Common Stock on the New York Stock
Exchange (New York Stock Exchange Composite Tape) for each quarter from January
1, 1996 through December 31, 1997, inclusive, were as set forth below.
<TABLE>
<CAPTION>
 
  PERIOD                           HIGH              LOW                   
  ------                           ----              ---                   
<S>                               <C>              <C>                     
                                                                           
  1996:                                                                    
     First Quarter                32-1/4             22-1/2                
     Second Quarter               31-1/8             22-1/4                
     Third Quarter                24-3/4             21-5/8                
     Fourth Quarter               24-1/8             20-3/8                
                                                                           
  1997:                                                                    
     First Quarter                25-1/2             21-5/8                
     Second Quarter               23-5/8             18-3/8                
     Third Quarter                27-3/8             21-7/8                
     Fourth Quarter               27-1/4             23-15/16              
</TABLE>

On February 27, 1998, the closing price of the Common Stock was $27.25, and
there were approximately 1,800 holders of record of the Common Stock.

During the last two years, Lyondell has declared $.225 per share quarterly cash
dividends (which were paid in the subsequent quarter).  The declaration and
payment of dividends is at the discretion of the Board of Directors.  The future
declaration and payment of dividends and the amount thereof will be dependent
upon the Company's results of operations, financial condition, cash position and
requirements, investment opportunities, future prospects and other factors
deemed relevant by the Board of Directors.  Subject to these considerations and
to the legal considerations discussed in the following paragraph, the Company
currently intends to distribute to its Stockholders cash dividends on its Common
Stock at a quarterly rate of $.225 per share. During 1997, the Company paid $72
million in dividends.

Certain debt instruments which were assumed by Equistar, but as to which
Lyondell remains an obligor as well, contain provisions that generally provide
that the holders of such debt may, under certain limited circumstances, require
the obligor to repurchase the debt ("Put Rights").  Among other things, the Put
Rights may be triggered by the making by either of Lyondell or Equistar of
certain unearned distributions to stockholders or partners, respectively, other
than regular dividends, that are followed by a specified decline in public
ratings on such debt.  Regular dividends are those quarterly cash dividends
determined in good faith by the Board of Directors (whose determination is
conclusive) to be appropriate in light of the Company's results of operations
and capable of being sustained.  These determinations were made prior to the
declaration of $.225 per share dividend paid on March 15, 1998.  Lyondell's
credit facility also could limit the Company's ability to pay dividends under
certain circumstances.  See Item 7 -- "Management's Discussion and Analysis of
Financial Condition and Results of Operations".

The operation of certain of the Company's employee benefit plans may result in
the issuance of Common Stock upon the exercise of options granted to employees
of the Company, including its officers.  Although the terms of these plans
provide that additional shares may be issued to satisfy the Company's
obligations under the options, the Company generally intends to cause Common
Stock to be repurchased in the market in order to satisfy these obligations.

                                       25
<PAGE>
 
ITEM 6.    SELECTED FINANCIAL DATA


The following table sets forth selected financial information for the Company.
<TABLE> 
                                                                            FOR THE YEAR ENDED DECEMBER 31
                                                ------------------------------------------------------------------------------
                                                               PRO FORMA
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNTS      1997 (A)      1996 (B)       1996         1995         1994         1993  
- ----------------------------------------------  -----------   ------------  -----------  -----------  -----------  -----------
<S>                                             <C>          <C>          <C>          <C>          <C>          <C>
Sales and other operating revenues                   $2,878       $2,644       $5,052       $4,936       $3,857       $3,850
Income from equity investments                          132            2          - -          - -          - -          - -
Income before cumulative effect of
  accounting changes                                    286          126          126          389          223            4
Net income (c)                                          286          126          126          389          223           26
Earnings per share before cumulative
  effect of accounting changes                         3.58         1.58         1.58         4.86         2.78          .06
Earnings per share                                     3.58         1.58         1.58         4.86         2.78          .33
Dividends per share                                     .90          .90          .90          .90          .90         1.35
Total assets                                          1,559        1,890        3,276        2,606        1,663        1,231
Long-term debt, less current portion                    345          744        1,194          807          707          717

</TABLE> 

(a)  Financial information for 1997 includes twelve months of operations for
     Lyondell and Lyondell Methanol Company, L.P., twelve months of operations
     of LYONDELL-CITGO Refining Company Ltd. ("LCR") as an equity investment and
     one month of operations of Equistar Chemicals, LP as an equity investment.

(b)  The unaudited pro forma financial information in the table above presents
     the financial position and results of operations of the Company as of
     December 31, 1996 and for the year then ended using the equity method of
     accounting for Lyondell's investment in LCR as if the change in accounting
     method had been effective January 1, 1996.  See Note 4 of "NOTES TO
     CONSOLIDATED FINANCIAL STATEMENTS."

(c)  The 1993 amount includes an increase in net income from the cumulative
     effect of an accounting change for turnarounds of $22 million, or $.27 per
     share.


ITEM 7.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
           RESULTS OF OPERATIONS

GENERAL

Lyondell Petrochemical Company ("Company" or "Lyondell") operates in the
petrochemicals, polymers and refining segments through its interests in Equistar
Chemicals, LP ("Equistar"), LYONDELL-CITGO Refining Company Ltd. ("LCR") and
Lyondell Methanol Company, L.P. ("Lyondell Methanol").

Equistar was formed on December 1, 1997 as a joint venture between Lyondell and
Millennium Chemicals Inc. ("Millennium") and is operated as a limited
partnership.  The Company has a 57 percent interest in Equistar with Millennium
owning the remaining 43 percent.  Equistar owns and operates the existing
petrochemicals and polymers businesses contributed by the two companies.
Lyondell accounts for its investment in Equistar under the equity method of
accounting, similar to the accounting for its investment in LCR.

In December 1996, the Company sold an undivided interest in its methanol
facility to MCN Investment Corporation ("MCNIC") and created Lyondell Methanol,
a partnership with MCNIC as the minority owner, to own and operate the methanol
facility. In accordance with the guidance in Emerging Issues Task Force Issue
No. 96-16 ("EITF 96-16"), Lyondell will account for its investment in Lyondell
Methanol under the equity method of accounting effective January 1, 1998.

                                       26
<PAGE>
 
In May 1995, the Company acquired Occidental Chemical Corporation's Alathon HDPE
business ("ALATHON Business").  Assets involved in the acquisition included the
production facilities in Matagorda ("Matagorda Facility") and Victoria
("Victoria Facility"), Texas, related research and development activities and
the rights to the Alathon trademark.  See Note 6 of "NOTES TO CONSOLIDATED
FINANCIAL STATEMENTS."

The petrochemicals segment consists of Lyondell's operations in petrochemicals
including: olefins (including ethylene, propylene, butadiene, butylenes and
specialty products); aromatics (including benzene and toluene); methanol; methyl
tertiary butyl ether ("MTBE"); and refinery blending stocks.  Lyondell's
interest in Lyondell Methanol for 1997 and the petrochemicals business of
Equistar, including ethanol and ethyl ether, for December 1997 are included in
the petrochemicals segment.

The polymers segment consists of Lyondell's operations in polyolefins including
high-density polyethylene ("HDPE"), low-density polyethylene and polypropylene.
The polymers, concentrates and compounds and wire and cable resins businesses of
Equistar for December 1997 are included in the polymers segment.

The Company's operations in the refining segment are conducted through its
interest in LCR, a Texas limited liability company owned by subsidiaries of the
Company and CITGO Petroleum Corporation ("CITGO").  The refining segment
consists of: refined petroleum products, including gasoline, low sulfur diesel,
and jet fuel; aromatics produced at the full-conversion Houston, Texas refinery
("Refinery"), including benzene, toluene, paraxylene and orthoxylene;
lubricants, including industrial lubricants, motor oils, white oils and process
oils; carbon black oil; sulfur; residual oil; petroleum coke fuel; olefins
feedstocks; and crude oil resales.  LCR completed a major upgrade project at the
Refinery ("Upgrade Project") during the first quarter of 1997 to enable the
facility to process substantial additional volumes of very heavy crude oil.

At inception, LCR entered into a long-term crude oil supply contract ("Crude
Supply Contract") with Lagoven, S.A., now known as PDVSA Petroleo y Gas, S.A.
("PDVSA Oil"), an affiliate of CITGO.  In addition, under terms of a long-term
product sales agreement ("Products Agreement"), CITGO purchases substantially
all of the refined products produced at the Refinery.  Both PDVSA Oil and CITGO
are direct or indirect wholly owned subsidiaries of Petroleos de Venezuela,
S.A., the national oil company of Venezuela.


RESULTS OF OPERATIONS


OVERVIEW

Net income for 1997 was $286 million or $3.58 per share compared with $126
million or $1.58 per share in 1996 and $389 million or $4.86 per share in 1995.
Earnings for 1997 included unusual charges of approximately $25 million after-
tax for costs related to the formation of Equistar.  Earnings for 1996 included
an approximate $20 million after-tax gain from the sale of an undivided interest
in the methanol facility.  Excluding these one-time items, the earnings increase
in 1997 versus 1996 was primarily due to higher sales margins for olefins and
methanol.  LCR's profit contribution in 1997 increased as higher volumes of very
heavy crude oil, which carry a favorable deemed margin under the Crude Supply
Agreement, were processed in 1997 due to the completion of the Upgrade Project.
Sales volumes for olefins and methanol also increased in 1997 over 1996 volumes.
Excluding the effect of the gain in 1996, the earnings decline in 1996 versus
1995 was primarily due to lower sales margins for petrochemicals and for
aromatics at LCR, partially offset by higher polymers earnings.

Financial information for 1997 includes twelve months of operations for Lyondell
and Lyondell Methanol, twelve months of operations of LCR as an equity
investment and one month of operations of Equistar as an equity investment.  Due
to the formation of Equistar on December 1, 1997, where appropriate, the
narrative discussion which follows compares 1997 operating results for the
petrochemicals and polymers businesses contributed by Lyondell to Equistar on an
annualized basis (as eleven months of operations of the businesses are included
in Lyondell's reported results on a consolidated basis) to the comparable twelve
month periods in 1996 and 1995.

                                       27
<PAGE>
 
PETROCHEMICALS SEGMENT


The following table sets forth: 1) sales volumes for the Company's major
products, including production, purchases of products for resale, propylene
production from the product flexibility unit, products received on exchange and
draws from inventory, and 2) the Company's sales and other revenues, including
intersegment sales.

<TABLE> 
<CAPTION> 
 
                                                          FOR THE YEAR ENDED DECEMBER 31
                                                                 -----------------------------------------
                                                                     1997            1996          1995  
                                                                 -----------      -----------   ----------
<S>                                                              <C>              <C>           <C> 
SELECTED PETROCHEMICAL PRODUCTS (MILLIONS)
   Ethylene, propylene and other olefins (pounds) (a)                 8,084             7,973        7,688
   Methanol (gallons)                                                   234               218          210
  Aromatics (gallons) (a)                                               176               188          175
                                                                     
MILLIONS OF DOLLARS                                                  
- --------------------
PETROCHEMICAL PRODUCTS REVENUES
    Ethylene, propylene and other olefins (a)                        $1,666            $1,515       $1,692
    Methanol                                                            130                92          125
    Aromatics (a)                                                       166               177          161
    Other petrochemical products and other revenues (a)                 570               509          365
                                                                 ----------       -----------   ----------
        Total petrochemical products sales                           $2,532            $2,293       $2,343
                                                                 ==========       ===========    =========           
</TABLE> 
____________________

(a)  Includes petrochemicals sales volumes and revenues for the eleven months of
     operations of the petrochemicals business prior to the formation of
     Equistar on December 1, 1997.  Methanol volumes are for twelve months of
     1997.


SELECTED PRICING INFORMATION  The following graphs present industry pricing
information for the periods shown below.


Chart 1 - Month-end average delivered-contract, monthly low price agreement
          prices for Ethylene as reported by CMAI Monomers Market Report from
          January 1995 through December 1997. Chart indicates decreasing prices
          in 1995 with an annual average of the month-end prices of 26.42 cents
          per pound. 1996 prices increased steadily, however the annual average
          of the month-end prices of 23.33 cents per pound is still below the
          1995 average. 1997 prices were relatively flat, although slightly
          decreasing, with an annual average of the month-end prices of 27.42
          cents per pound. Selected month-end average prices are as follows:
          January 1995 - 28.00 cents per pound, December 1995 - 21.00 cents per
          pound, December 1996 - 26.25 cents per pound, December 1997 - 26.25
          cents per pound.

Chart 2 - Month-end average spot price WTS low prices for Crude Oil as reported
          by Platts Oilgram Price Report from January 1995 through December
          1997. Chart indicates volatile, but increasing prices in 1995 and 1996
          with the chart's peak occurring at $24.32 per barrel in December 1996.
          Annual average month-end prices were $17.84 per barrel in December
          1996. Annual average month-end prices were $17.84 per barrel in 1995
          and $21.35 per barrel in 1996. Prices decreased in 1997 with an annual
          average of the month-end prices of $19.35 per barrel. Prices were
          volatile in all three years although 1995 was somewhat flat. Selected
          month-end average prices are as follows: January 1995 - $17.55 per
          barrel, December 1995 - $18.22 per barrel, December 1996 - $24.32 per
          barrel, December 1997 - $17.13 per barrel.

OPERATING INCOME  Excluding income from equity investments, operating income
amounted to $444 million in 1997 compared to $240 million in 1996 and $566
million in 1995.  On an annualized basis, petrochemicals operating income more
than doubled in 1997 due to higher sales margins and sales volumes for olefins
and methanol.  Sales margins for olefins improved due to higher olefins sales
prices, resulting from strong demand for the downstream polyolefins markets, and
lower feedstock costs.  Olefins sales volumes increased due to strong demand in
the downstream polyolefin markets.  Methanol sales margins improved as a result
of higher industry sales prices, slightly offset by higher natural gas feedstock
costs.  Sales volumes of methanol improved due to strong demand generated for
downstream products by the gasoline end-use markets and housing and plastic
packaging industries and significant industry capacity outages as well as delays
in the startup of new capacity.

The $298 million decline in operating income in 1996 as compared to 1995 was
primarily due to lower sales margins for olefins due to higher feedstock costs.
Lyondell's olefins feedstocks are primarily condensates and other petroleum
liquids which tend to follow the cost trends of crude oil.  Since 1995 and
through 1996 the price of crude oil increased steadily which resulted in higher
feedstock costs for the petrochemicals business; however, crude oil 

                                       28
<PAGE>
 
prices began dropping in 1997 and have remained below 1996 prices through the
end of 1997. The sales prices for various olefins products are primarily driven
by three factors. The first factor is the demand for ethylene, propylene and
other by-products as a result of economic conditions in end-use markets. The
second factor is the operating rate of the installed capacity to produce olefin
products. The third factor driving sales prices is the underlying cost of the
feedstock. Strong demand and high operating rates were the primary factor which
drove 1997 prices for these products above 1996 levels.

Methanol is a component of products used by the housing and plastic packaging
industry, as well as being a primary component of MTBE, a product used to blend
low-emission reformulated gasoline. Methanol sales prices gradually increased
from the fourth quarter of 1995 throughout 1996 due to strong demand by the end-
use markets and supply constraints due to industry operating problems.  Methanol
sales prices have remained at a steady level above 1996 prices through the end
of 1997.  The price of natural gas, the principal methanol feedstock, increased
throughout 1995 and 1996 and into January 1997 as a result of the tight supply
and demand balance in the fuels market.  After dropping significantly in early
1997, natural gas prices climbed upwards from March to November 1997 due to
increased seasonal demand entering the winter months, but dropped in December
1997.

REVENUES  Sales and other operating revenues, including intersegment sales, were
$2.5 billion in 1997 compared to $2.3 billion in 1996 and $2.3 billion in 1995.
On an annualized basis, sales and other operating revenues increased 20 percent
in 1997 over 1996 due to increased industry sales prices for by-products and
ethylene, as well as methanol.  Sales prices in 1997 showed significant
increases over 1996 as strong demand from the polyolefins markets resulted in a
tighter balance of supply and demand for olefins, and also as cost increases for
olefins feedstocks over the course of 1996 were reflected in olefins product
prices in 1997.  In addition, olefins sales volumes increased due to strong
demand in the downstream markets as well as planned and unscheduled industry
turnarounds.  Sales prices for methanol increased in 1997 due to a tighter
supply and demand situation caused by unscheduled industry downtime.  Methanol
sales volumes increased in 1997 over 1996 in response to higher demand generated
for downstream products by the gasoline end-use markets and the housing and
plastic packaging industries.

The $50 million decrease in 1996 compared to 1995 was primarily due to lower
sales prices for petrochemicals.  Compared to most of 1995, which was a period
of strong market conditions for petrochemicals generally, average sales prices
for petrochemicals during 1996 were lower due to a decline in market conditions
which began in the latter part of 1995.  This decline was due to additional
olefins capacity that came onstream in 1995 and customer inventory corrections
in the latter part of 1995.  However, 1996 was still a strong year for
petrochemical demand, in particular ethylene, and prices increased throughout
the year after bottoming early in 1996 (see Chart 1).

In July 1996 a fire occurred at the ARCO PipeLine Company meter station located
within the Channelview, Texas petrochemicals facility (the "Channelview
Facility").  The fire forced the shutdown of the entire Channelview Facility for
several days and more than two weeks for some units.  The Company recovered lost
profits from ARCO PipeLine Company for this shutdown.  The recovery was included
in 1996 reported results.

INCOME FROM EQUITY INVESTMENT IN EQUISTAR  Lyondell's share of Equistar's
petrochemicals division earnings for the month of December 1997, before its 57
percent share of the unusual charge consisting of costs related to the formation
of Equistar, was $28 million.

GAIN ON SALE OF ASSETS  Gain on sale of assets resulted primarily from the sale
of an undivided interest in the Company's methanol facility to MCNIC in December
1996.

COST OF SALES  Cost of sales was $2.1 billion in 1997 compared to $2.0 billion
in 1996 and $1.7 billion in 1995.  On an annualized basis, cost of sales
increased nearly ten percent in 1997 over 1996 due to higher production levels
to meet sales demand for both olefins and methanol.  This increase was offset by
lower feedstock costs for olefins, generally due to lower crude oil prices.
Natural gas feedstock costs for methanol were slightly higher due to strong
seasonal winter demand in the first and fourth quarters of 1997.  The 1996
increase of over $300 million compared to 1995 was primarily due to higher
olefins feedstock costs reflecting the higher crude oil and related products
prices (see Chart 2).

                                       29
<PAGE>
 
SELLING EXPENSES  Selling expenses amounted to $26 million in 1997 compared to
$34 million in 1996 and $31 million in 1995.  On an annualized basis, selling
expenses for 1997 decreased over 20 percent due to increased freight
reimbursements on exchanges.  In addition, terminal expense related to storing
product in anticipation of shutting down one of the olefins units for a
maintenance turnaround in 1996 was lower in 1997.  The $3 million increase in
selling expenses in 1996 over 1995 was primarily due to the higher terminal
expense related to the olefins units maintenance turnaround.


POLYMERS SEGMENT

The following table sets forth: 1) sales volumes for the Company's major
polymers products, including production, purchases of products for resale,
products received on exchange and draws from inventory, and 2) the Company's
sales and other revenues, including intersegment sales.  The volumes and
revenues below include eight months of ownership of the ALATHON Business in
1995.  The ALATHON Business was acquired in May 1995.



<TABLE>
<CAPTION>
 
                                                                        FOR THE YEAR ENDED DECEMBER 31
                                                                 ----------------------------------------------
                                                                       1997              1996            1995
                                                                 -------------     --------------    ----------
<S>                                                              <C>               <C>               <C> 
POLYMERS PRODUCTS (MILLIONS)
     Polyethylene and polypropylene (pounds) (a)                         1,985              2,136         1,598


MILLIONS OF DOLLARS                                                                                                       
- -------------------
POLYMERS PRODUCTS REVENUES (a)
    Polyethylene and polypropylene                                        $768               $780          $625
    Other polymers products and other revenues                               2                  3             2
                                                                 -------------     --------------    ---------- 
        Total polymers products sales                                     $770               $783          $627
                                                                 =============     ==============    ==========
</TABLE>
____________________

(a)  Includes polymers sales volumes and revenues for eleven months of
     operations of the polymers business prior to the formation of Equistar on
     December 1, 1997.


OPERATING INCOME  Excluding income from equity investments, operating income
amounted to $82 million in 1997 compared to $97 million in 1996 and $69 million
in 1995.  On an annualized basis, polymers operating income decreased over 10
percent due to lower sales prices for polypropylene and higher feedstock costs.
Industry sales price increases for most products became effective towards the
end of the first quarter of 1997, but started to decrease in the third quarter
of 1997.  Polypropylene industry sales prices were negatively impacted by
additional industry capacity added during 1997.  Feedstock costs were higher
during 1997 as compared to 1996 due to tighter supply and demand in the olefins
markets.  The $28 million increase in operating income in 1996 as compared to
1995 was primarily due to higher profits from the ALATHON Business.

Lyondell's polymers feedstocks are primarily ethylene and propylene.  During
1996 and 1997 the industry sales price of ethylene increased steadily which
resulted in higher feedstock costs for the polymers business.  The sales prices
for various polymers products are primarily driven by two factors.  One is the
supply and demand balance for the products as a result of industry capacity
additions as well as economic conditions in end-use markets such as the auto
industry, housing construction and consumer durable and non-durable goods.
Secondarily, sales prices are driven by the underlying cost of the feedstock.

REVENUES  Sales and other operating revenues, including intersegment sales, were
$770 million in 1997 compared to $783 million in 1996 and $627 million in 1995.
On an annualized basis, polymers revenues increased seven percent due to higher
industry sales prices for polyethylene, which were partially offset by decreased
industry sales prices for polypropylene.  The $156 million increase in 1996
compared to 1995 was primarily due to higher sales resulting from a full year's
revenues from the ALATHON Business.

INCOME FROM EQUITY INVESTMENT IN EQUISTAR  Lyondell's share of Equistar's
polymers division earnings for the month of December 1997, before its 57 percent
share of the unusual charge consisting of costs related to the formation of
Equistar, was $13 million.

                                       30
<PAGE>
 
COST OF SALES  Cost of sales was $612 million in 1997 compared to $608 million
in 1996 and $505 million in 1995.  The annualized 1997 increase of nearly 10
percent was primarily due to increased feedstock costs caused by tight supply
and demand in the olefins markets.  The 1996 increase of $103 million compared
to 1995 was primarily due to higher cost of sales resulting from a full year's
operations of the ALATHON Business.

SELLING EXPENSES  Selling expenses amounted to $76 million in 1997 compared to
$78 million in 1996 and $53 million in 1995.  On an annualized basis, selling
expenses increased in 1997 over 1996 by six percent due to slightly increased
annualized sales volumes and inventory levels resulting in higher shipping and
storage costs.  The $25 million increase in selling expenses in 1996 compared to
1995 was primarily due to the operation of the ALATHON Business for a full year
in 1996 compared to eight months in 1995.  For the polymers business, the cost
of transporting finished products to customers by rail, including rail freight
costs and rail car lease expense, is classified as selling expense.


REFINING SEGMENT

The refining segment consists primarily of the results of operations of LCR.
Effective January 1, 1997, Lyondell began accounting for its investment in LCR
under the equity method of accounting.  LCR's results of operations were
consolidated in 1996 and 1995.  The narrative discussion that follows compares
LCR's 1997 operating results to the information for the comparable periods in
1996 and 1995.  The results below include a restatement for a pricing adjustment
between LCR and Lyondell recorded in 1996 retroactive to 1993.


<TABLE>
<CAPTION>

                                                                          FOR THE YEAR ENDED DECEMBER 31
                                                                   ----------------------------------------------
                                                                      1997               1996             1995
                                                                   ----------           --------        --------- 
<S>                                                                <C>                  <C>             <C> 
MILLIONS OF DOLLARS  
- -------------------             
Sales and other operating revenues                                   $2,695             $2,816          $2,651
Cost of sales                                                         2,442              2,753           2,462
Selling, general and administrative expenses                             72                 59              58
                                                                   ----------           --------        ---------      
Operating income                                                        181                  4             131
Interest expense, net                                                    35                - -              (2)
State income taxes                                                        1                - -               3
                                                                   ----------           --------        ---------      
Net income                                                           $  145             $     4         $  130
                                                                   ==========           ========        =========      

</TABLE> 

The following table sets forth: 1) sales volumes for LCR's major products,
including production, purchases of products for resale, products received on
exchange and draws from inventory and 2) LCR's sales and other revenues,
including intersegment sales.

<TABLE>
<CAPTION>
 
                                                          FOR THE YEAR ENDED DECEMBER 31
                                                 ----------------------------------------------
                                                       1997            1996          1995 
                                                   -----------    -----------    -----------
<S>                                                <C>            <C>            <C> 
REFINED PRODUCTS (THOUSAND BARRELS PER DAY)
    Gasoline                                            111            101            109
    Diesel and heating oil                               68             47             52
    Jet fuel                                             17             24             29
    Aromatics                                            11              9             10
    Other refined products                               93             82             75
                                                   -----------    -----------    -----------
        Total refined products volumes                  300            263            275
                                                   ===========    ===========    ===========
MILLIONS OF DOLLARS
- -------------------
REFINED PRODUCTS REVENUES
    Gasoline                                         $1,017           $937           $879
    Diesel and heating oil                              568            421            375
    Jet fuel                                            145            220            220
    Aromatics                                           189            181            258
    Other refined products and other revenues           613            621            549
                                                   -----------    -----------    -----------
        Total refined products sales                  2,532           2,380         2,281
                                                   ===========    ===========    ===========
    Crude oil resales (a)                               163             436           370
                                                   -----------    -----------    -----------
        Total refined products and crude oil sales   $2,695          $2,816        $2,651
                                                   ===========    ===========    ===========
</TABLE>

                                       31
<PAGE>
 
__________________________

(a)  Crude oil resales consist of revenues from the resale of previously
     purchased crude oil and from locational exchanges of crude oil that are
     settled on a cash basis.  Crude oil exchanges and resales facilitate the
     operation of the refining segment by allowing the Company to optimize the
     crude oil feedstock mix in response to market conditions and refinery
     maintenance turnarounds and to reduce transportation costs.



GENERAL  At its inception, LCR entered into the Crude Supply Contract with PDVSA
Oil.  LCR is required to purchase, and PDVSA Oil is required to sell, sufficient
crude oil to satisfy LCR's coking capacity, or a minimum of 200,000 barrels per
day and up to 230,000 barrels per day of very heavy Venezuelan crude oil.  PDVSA
Oil has the right, but not the obligation, to supply incremental amounts above
230,000 barrels per day.  In addition, under terms of the Products Agreement,
CITGO purchases substantially all of the refined products produced at the
Refinery.


The Upgrade Project was completed one month ahead of schedule in the first
quarter of 1997.  The completion enabled LCR to begin to take full benefit of
the Crude Supply Contract in March 1997.  Beginning in March 1997, increasing
volumes of very heavy crude oil were processed, with fourth quarter heavy crude
runs averaging 247,000 barrels per day (233,000 barrels per day under the Crude
Supply Contract in the coking mode).

The following table sets forth processing rates at the Refinery for the periods
indicated.  Refinery runs for 1996 are primarily heavy crude oil, whereas the
1997 refinery runs reflect higher volumes of very heavy crude oil processed.


<TABLE>
<CAPTION>
 
                                                          FOR THE YEAR ENDED DECEMBER 31
                                                 ----------------------------------------------
                                                      1997            1996            1995 
                                                   ----------      ----------      ---------- 
<S>                                                <C>             <C>             <C> 
REFINERY RUNS (THOUSAND BARRELS PER DAY)
Crude oil:
        Crude Supply Contract - coked                  196             116             108
        Other heavy crude oil - coked                   14               6               2
        Other crude oil                                 14              96             128
                                                   ----------      ----------      ---------- 
             Total crude oil                           224             218             238
    Unfinished stock                                    70              45              48
                                                   ----------      ----------      ---------- 
             Total                                     294             263             286
                                                   ==========      ==========      ========== 
</TABLE>


OPERATING INCOME  LCR's operating income improved in 1997 to $181 million
compared to $4 million in 1996 due to improved margins caused primarily by
higher volumes of very heavy crude oil processed in the coking mode under the
Crude Supply Contract.  These improved margins were offset partially by higher
production costs, primarily depreciation expense, and lower paraxylene margins.

Operating income for LCR amounted to $4 million in 1996 compared to $131 million
in 1995.  During 1996, profit performance from refined products benefited from
high processing rates of heavy Venezuelan crude oil.  However, this improvement
was offset by lower margins due to rising feedstock costs for the crude oil runs
not covered by the Crude Supply Contract.  Operating rates for the crude oil
purchased outside the Crude Supply Contract were reduced significantly in the
third quarter of 1996 due to poor economics.  The $127 million decrease in 1996
compared to 1995 was primarily due to lower aromatics (primarily paraxylene and
orthoxylene) and refined products (gasoline, low sulfur diesel and jet fuel)
sales margins and to higher period costs.  Overall, aromatics sales margins were
lower in 1996 primarily due to lower sales prices for orthoxylene and
paraxylene.  Refined products sales margins decreased due to higher crude oil
(see Chart 2) and other feedstock costs, which more than offset higher refined
product sales prices, as well as higher fuel costs.  Refining period costs were
higher in 1996 due to higher maintenance expense and personnel compensation.

REVENUES  Upon the completion of the Upgrade Project in the first quarter of
1997, LCR began processing increased volumes of very heavy crude oil under the
Crude Supply Contract resulting in higher margins.  Sales and other operating
revenues for LCR, including intersegment sales, were $2.7 billion in 1997
compared to $2.8 billion in 1996.  The 1997 decrease of $121 million compared to
1996 primarily resulted from lower crude oil resales, lower refined products
pricing and lower aromatics pricing, particularly paraxylene.  These decreases
were offset by higher sales volumes as production levels after completion of the
Upgrade Project increased. Crude oil resales 

                                       32
<PAGE>
 
consist of revenues from the resale of previously purchased crude oil and from
locational exchanges of crude oil that are settled on a cash basis. Crude oil
exchanges and resales facilitate the operation of the refining segment by
allowing the Company to optimize the crude oil feedstock mix in response to
market conditions and refinery maintenance turnarounds and to reduce
transportation costs. For crude oil purchases outside the Crude Supply Contract,
approximately three barrels of crude oil are purchased for every barrel
processed with the remaining two barrels traded or resold. Beginning in the
second quarter of 1996 and continuing in 1997, paraxylene prices declined due to
additional industry capacity and continued inventory reductions in the PET
business by plastic beverage container customers and in the polyester fibers
business by clothing and fabric manufacturing customers.

LCR's sales and other operating revenues, including intersegment sales, were
$2.8 billion in 1996 compared to $2.6 billion in 1995.  The 1996 increase of
$165 million compared to 1995 primarily resulted from higher sales prices for
refined products and higher prices on crude oil resales, partially offset by
lower paraxylene and orthoxylene prices. Paraxylene and orthoxylene prices were
at historical highs during the first half of 1995 before returning to a more
normal level in the fourth quarter of 1995 due to increased industry production
and lower demand as a result of customers' inventory reductions.

COST OF SALES  Cost of sales was $2.4 billion in 1997 compared to $2.8 billion
in 1996 for LCR.  The $311 million decrease in 1997 compared to 1996 was
primarily due to lower costs of crude oil and other petroleum feedstock costs.
Crude oil feedstock costs are tied to sales prices under the Products Agreement.
As industry sales prices declined as a result of lower industry crude prices,
feedstock costs for LCR were lower.  In addition, crude oil resale costs were
lower due to significantly lower volumes of crude oil resales as purchases under
the Crude Supply Contract increased in 1997.  These lower costs were offset
partially by higher production costs, primarily depreciation expense.

LCR's cost of sales was $2.8 billion in 1996 compared to $2.5 billion in 1995.
The 1996 increase compared to 1995 of $291 million was primarily due to higher
crude oil and other petroleum feedstock costs and higher costs of crude oil
resales, both of which resulted from higher industry crude oil prices.  In
addition, period costs, primarily maintenance, increased.

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES  Selling, general and
administrative expenses for LCR were $72 million in 1997 compared to $59 million
in 1996 and $58 million in 1995.  The increase in 1997 is primarily due to
increased selling expense as a result of product mix and increased employee
compensation including incentive compensation.

INTEREST EXPENSE  LCR's interest expense was $37 million in 1997 compared to $2
million in 1996 and $1 million in 1995.  Interest expense on debt related to
construction of the Upgrade Project was capitalized through its completion
including the first quarter of 1997, and the years 1996 and 1995.

INTEREST INCOME  LCR's interest income was $2 million in 1997 compared to $2
million in 1996 and $3 million in 1995.


UNALLOCATED

GENERAL AND ADMINISTRATIVE EXPENSES  General and administrative expenses were
$84 million in 1997 compared to $60 million in 1996 and $59 million in 1995.
The increase in 1997 compared to 1996 was due to increased employee compensation
and computer support costs, primarily due to headcount increases related to
software implementation.  In addition, employee incentive compensation
increased.

UNUSUAL CHARGE  The unusual charge of $40 million in 1997 consists of costs
related to the formation of Equistar comprised primarily of costs associated
with a reduction of the workforce and consolidation of certain operations.
Lyondell's $24 million share of Equistar's unusual charges was allocated to
Lyondell in accordance with its 57 percent ownership percentage.  Lyondell also
incurred $16 million of costs related to the early termination of incentive
compensation plans and executive severance.

                                       33
<PAGE>
 
INTEREST EXPENSE  Interest expense was $75 million in 1997 compared to $81
million in 1996 and $80 million in 1995.  The decrease in 1997 is primarily due
to the transfer of debt to Equistar as of December 1, 1997.

INTEREST INCOME  Interest income was $14 million in 1997 compared to $3 million
in 1996 and $6 million in 1995.  The increase in 1997 resulted from higher
levels of loans to LCR outstanding during the year.  The $3 million decrease in
interest income in 1996 compared to 1995 was primarily due to lower levels of
excess cash available for investment.

MINORITY INTEREST  Minority interest was $17 million in 1997 representing the
allocated share of Lyondell Methanol net income to MCNIC, the minority owner of
Lyondell Methanol.  Minority interest of $4 million in 1996 represents the
allocated share of LCR net income to CITGO, the minority owner of LCR, and the
allocated share of Lyondell Methanol net income to MCNIC.  Minority interest was
$14 million in 1995 representing the allocated share of LCR net income to CITGO.

INCOME TAX  The effective income tax rate during 1997 was 37.3 percent compared
to 35.7 percent for 1996 and 37.1 percent for 1995.  The effective income tax
rate increased in 1997 due to the non-deductibility of executive compensation.
State income tax was the primary difference between the effective tax rate and
the 35 percent federal statutory rate during each of the periods.


FINANCIAL CONDITION


OPERATING ACTIVITIES  Lyondell's cash flow from operating activities totaled
$269 million during 1997 compared to $232 million and $471 million generated in
1996 and 1995, respectively.  The 1997 improvement is primarily attributable to
the increase in net income in 1997 versus 1996 offset by changes in working
capital, primarily accounts payable as a result of feedstock price changes
between December 31 of each year.

INVESTING ACTIVITIES - CAPITAL EXPENDITURES  The Company made capital
expenditures of $49 million during 1997, primarily for projects at the
petrochemical plants.  Equistar made capital expenditures of $12 million, of
which $7 million is Lyondell's share, during the month of December 1997.
Excluding Upgrade Project expenditures totaling $45 million, LCR made capital
expenditures of $40 million during 1997, of which $11 million related to
environmental projects with the remainder for other maintenance and capital
projects.  Upgrade Project expenditures during 1997 were funded by $18 million
from Lyondell in the form of subordinated loans to LCR, $16 million from CITGO
in the form of subordinated loans to LCR, and $10 million and $1 million of
contributions made during 1997 by CITGO and Lyondell, respectively.

CITGO provided a major portion of the funding for the Upgrade Project which
through December 31, 1997 totaled cash contributions of $490 million, including
cash contributions for the carrying costs of the debt.  CITGO also reinvested
approximately $46 million of cash distributions through the first quarter of
1997.  In addition, CITGO provided $130 million for funding other non-Upgrade
Project capital projects through March 1, 1997.


INVESTING ACTIVITIES - CONTRIBUTIONS AND ADVANCES TO/DISTRIBUTIONS FROM
AFFILIATE Contributions to Equistar include $1 million in 1997 for the initial
funding of Equistar's cash accounts. A distribution in excess of earnings before
unusual charges of $27 million from Equistar was received in December 1997.


Contributions and advances to LCR in 1997 include $18 million in subordinated
loans to LCR for the Upgrade Project expenditures, $2 million in contributions
for other capital projects and $65 million in working capital contributions.
Distributions in excess of earnings of $45 million were made by LCR to Lyondell
in 1997.


FINANCING ACTIVITIES  Cash used in financing activities in 1997 consisted
primarily of the retirement of $112 million of long-term debt.  Distributions to
MCNIC, the minority owner of Lyondell Methanol, totaled $16 million during 1997.
Borrowings of $50 million in 1997 were used primarily to finance costs related
to the formation of Equistar in December 1997.  Long-term debt, and the current
portion thereof, outstanding at December 1, 1997 of $744 million was contributed
to Equistar.

                                       34
<PAGE>
 
The Board of Directors authorized a $75 million stock repurchase program in
September 1997.  The Company had purchased 1,400,012 shares of common stock
through March 1, 1998 including 1,015,512 shares of common stock for
approximately $26 million through December 31, 1997.


In August 1994, Atlantic Richfield Company ("ARCO") issued three-year debt
securities ("Exchangeable Notes") which were exchangeable upon maturity on
September 15, 1997 into Lyondell common stock or an equivalent cash value, at
ARCO's option.  On September 15, 1997, ARCO delivered shares of Lyondell common
stock to the holders of the Exchangeable Notes.  The Company purchased the
remaining 383,312 shares of common stock held by ARCO after the conversion.  As
of September 30, 1997, ARCO owns no shares of common stock of Lyondell.


The Company paid regular quarterly dividends of $.225 per share of common stock
in each quarter of 1997.  On January 23, 1998, the Board of Directors declared a
regular quarterly dividend in the amount of $.225 per share of common stock,
payable March 15, 1998 to stockholders of record on February 25, 1998.



LYONDELL PETROCHEMICAL COMPANY DEBT  Effective December 1, 1997, the Company has
a 364-day, $225 million revolving credit facility ("Facility") with a group of
banks, which replaced the five-year $400 million revolving credit facility.
Borrowings under the Facility bear interest at either the eurodollar or prime
rates or rates based on a competitive auction feature wherein the interest rate
can be established by competitive bids submitted by the sponsoring banks, all at
the Company's option.  The Facility is available for working capital and general
corporate purposes as needed and contains covenants relating to disposition of
assets, mergers and consolidations, and certain ratios.  At December 31, 1997,
no amounts were outstanding under this Facility.


The Company also has uncommitted lines of credit totaling $150 million with
banks and other financial institutions.  These uncommitted lines of credit
provide the Company with additional borrowing flexibility and potentially more
competitive interest rates.  The Company can borrow money on these uncommitted
lines of credit on such terms as may be mutually agreed upon at the time amounts
are borrowed.  The lines of credit can be terminated by the lenders, in their
sole discretion, on short notice.  As of December 31, 1997, the Company had $100
million outstanding under these uncommitted lines of credit.


EQUISTAR CHEMICALS, LP DEBT  As of December 31, 1997, Equistar had $744 million
of long-term debt (including the current portion) consisting of: (i) $150
million of notes due in 1999; (ii) $100 million of notes due in 2002; (iii) $150
million of notes due in 2006; (iv) $150 million of debentures due in 2026; and
(v) $194 million of medium-term notes due from 1998 to 2005.  Equistar assumed
primary liability for all of the foregoing indebtedness of Lyondell in
connection with its formation.   Lyondell also continues to be liable on such
debt until its maturity.

In connection with its formation, on December 1, 1997, Equistar entered into a
five-year, $1.25 billion Credit Facility (the "Equistar Credit Facility") with a
group of banks expiring November 2002.  Borrowings under the Equistar Credit
Facility bear interest at either the Federal Funds rate plus  1/2 of 1 percent,
LIBOR, a fixed rate offered by one of the sponsoring banks or rates that are
based on a competitive auction feature wherein the interest rate can be
established by competitive bids submitted by the sponsoring banks, depending on
the type of borrowing made under the Facility.  The Facility is available for
working capital and general purposes as needed and contains covenants relating
to liens, sale and leaseback transactions, debt incurrence, leverage and
interest coverage ratios, sales of assets and mergers and consolidations.  As of
December 31, 1997, Equistar had $800 million outstanding under the Equistar
Credit Facility.  Millennium America, Inc., a subsidiary of Millennium
("Millennium America"), guaranteed the payment of principal and interest on a
total of $750 million principal amount of indebtedness under the Equistar Credit
Facility; however, the lenders may not proceed against Millennium America until
they have exhausted their remedies against Equistar.  The guarantee will remain
in effect indefinitely, but at any time after the seventh anniversary of the
Equistar Credit Facility, Millennium America may elect to terminate the
guarantee if certain events occur.

LYONDELL-CITGO REFINING COMPANY LTD. DEBT  In May 1995, LCR entered into two
credit facilities totaling $520 million with a group of banks with The Bank of
New York as agent (together the "LCR Credit Facilities").  The first facility, a
$70 million, 364-day revolving working capital facility, was renewed in 1997 and
is being utilized for general business purposes and for letters of credit.  At
December 31, 1997, no amounts were outstanding under this credit facility.  The
second facility is a $450 million, five-year term credit facility that was used
to 

                                       35
<PAGE>
 
partially fund the Upgrade Project. At December 31, 1997, $450 million was
outstanding under this credit facility with a weighted average interest rate of
6.5 percent. Interest for both facilities is based on prime or eurodollar rates
at LCR's option. The LCR Credit Facilities contain covenants that require LCR to
maintain a minimum net worth which increases each year until 1998 and
maintenance of certain financial ratios defined in the agreements. The LCR
Credit Facilities also contain other customary covenants which limit LCR's
ability to modify certain significant contracts, incur additional debt or liens,
dispose of assets, make restricted payments as defined in the agreements or
merge or consolidate with other entities.



ACCOUNTING STANDARDS


In June 1997, the FASB issued Statement of Financial Accounting Standards
("SFAS") No. 130, "Reporting Comprehensive Income."  SFAS No. 130 establishes
standards for reporting and display of comprehensive income and its components.
SFAS No. 130 requires all items that are required to be recognized under
accounting standards as components of comprehensive income be reported in a
financial statement that is displayed with the same prominence as other
financial statements.  SFAS No. 130 is effective for fiscal years beginning
after December 15, 1997.  The Company does not believe the effect of adoption of
SFAS No. 130 in 1998 will have a material impact on the Company.

In June 1997, the FASB issued SFAS No. 131, "Disclosures about Segments of an
Enterprise and Related Information."  SFAS No. 131 establishes standards for the
way that public business enterprises report information about operating segments
in annual financial statements and requires that those enterprises report
selected information about operating segments in interim financial reports
issued to shareholders.  SFAS No. 131 also establishes standards for related
disclosures about products and services, geographic areas, and major customers.
SFAS No. 131 is effective for financial statements for fiscal years beginning
after December 15, 1997.  The Company plans to adopt SFAS No. 131 in 1998 and
disclose the methanol business currently included in the petrochemicals segment
as a separate segment.


YEAR 2000


Lyondell and Equistar have replaced many of their business and operating
computer systems (including systems operated by Equistar for Lyondell Methanol).
Equistar is in the process of replacing the systems for the operations
contributed by Millennium.  LCR is in the process of replacing many of its
business and operating computer systems.  The new systems, based on enterprise
software from SAP America, Inc., will replace older systems and allow employees
at different locations to share financial and operating information more
efficiently.  The first major use of the software commenced May 1, 1997 for the
majority of the financial and operating systems of the operations contributed to
Equistar by Lyondell.  Remaining phases are targeted for completion late in 1998
and into the first half of 1999.  The new systems and software are Year 2000
compatible, thus handling the majority of the Company's Year 2000 conversion
requirements.  Equistar and LCR are developing conversion strategies for their
remaining systems.  Management does not believe Year 2000 compliance will be a
significant issue.


ENVIRONMENTAL MATTERS


Various environmental laws and regulations impose substantial requirements upon
the operations of the Company.  The Company's policy is to be in compliance with
such laws and regulations, which include, among others, the Comprehensive
Environmental Response, Compensation and Liability Act of 1980 ("CERCLA"), as
amended, the Resource Conservation and Recovery Act ("RCRA") and the Clean Air
Act.  In connection with the transfer of assets and liabilities from Atlantic
Richfield Company ("ARCO") to the Company at the time the Company was formed
into a separate company, effective July 1, 1988, the Company and ARCO entered
into an agreement ("Cross-Indemnity Agreement") whereby the Company agreed to
defend and indemnify ARCO against certain 

                                       36
<PAGE>
 
uninsured claims and liabilities which ARCO may incur relating to the operation
of the business of the Company prior to July 1, 1988, including certain
liabilities which may arise out of pending and future lawsuits. ARCO, along with
many other companies, has been named a potentially responsible party ("PRP")
under CERCLA in connection with the past disposal of waste at third party waste
sites. Pursuant to the Cross-Indemnity Agreement, the Company is currently
contributing funds for one site pursuant to its obligation to reimburse ARCO for
a portion of its uninsured remediation costs. The Company has reached an
agreement-in-principle with ARCO to update the Cross-Indemnity Agreement
("Revised Cross-Indemnity Agreement"). Under the Revised Cross-Indemnity
Agreement, both ARCO and the Company waive any claim for reimbursement under the
existing Cross-Indemnity Agreement for any prior defense and settlement costs
associated with waste site matters, and the Company will assume responsibility
for its proportionate share of future costs for waste site matters not covered
by ARCO insurance. The obligation described above will continue under the
Revised Cross-Indemnity Agreement.

Lyondell and Millennium have similar indemnifications with Equistar related to
the petrochemicals and polymers business contributions by the companies.
Equistar has agreed to indemnify and defend Lyondell and Millennium,
individually, against certain uninsured claims and liabilities which Equistar
may incur relating the operation of the contributed business prior to December
1, 1997 up to $7 million each within the first seven years of the partnership,
subject to certain terms of the Asset Contribution Agreements.

The Company reserves for contingencies, including those based upon unasserted
claims, that are probable and reasonably estimable.  In connection with
environmental matters, the Company establishes reserves based upon known facts
and circumstances.  Based on current environmental laws and regulations, the
Company believes it has adequately reserved for the matters described above and,
based upon such reserves, does not anticipate any material adverse effect upon
its earnings, operations or competitive position, although the resolution in any
reporting period of one or more of these matters could have a material impact on
the Company's results of operations for that period.

Lyondell's environmental reserve at December 31, 1997 was $12 million. The
Company spent $1 million, $2 million and $9 million in 1997, 1996 and 1995,
respectively, relating to environmental matters.  The Company estimates it will
spend approximately $2 million in conjunction with environmental matters in
1998, which is included in the December 31, 1997 environmental reserve.


CURRENT BUSINESS OUTLOOK

On December 1, 1997, the Company and Millennium formed Equistar, which owns and
operates the existing petrochemicals and polymers businesses contributed by the
two companies.  The formation of Equistar is expected to result in cost savings
and profit improvement synergies of more than $150 million per year by the year
2000.  For 1998, the net positive impact of the synergies, after one-time costs,
is expected to be $50 million.

During the remainder of 1998, management expects that olefins supply and demand
fundamentals will be weakening versus the conditions that prevailed in 1997.
Additional industry capacity was added in the fourth quarter of 1997.  The
relatively greater increase in supply versus demand increases may negatively
impact pricing of olefins into 1998.  However, unplanned industry outages may
somewhat offset the increased supply and mitigate the pricing effect.  Feedstock
costs are lower in the first quarter of 1998 also offsetting lower pricing
effects.  The Asian financial crisis in primarily, Thailand, Malaysia, Indonesia
and the Philippines continues to have a short-term impact on exports in
downstream markets which impacts industry pricing and volumes.

Polymers prices are still decreasing slightly and are currently at lower levels
than experienced in 1997.  Offsetting this will be reduced feedstock costs from
decreasing olefins pricing.  Additional industry capacity added in the second
half of 1997 also may negatively impact prices and margins in 1998.  Polymers
demand growth in 1998 is expected to remain at historical rates.

More than 90 percent of LCR's crude oil purchases are made pursuant to the Crude
Supply Contract which significantly reduces the crude oil volume which is
sensitive to market conditions. In the last half of 1997, 

                                       37
<PAGE>
 
throughput rates were consistent and strong, resulting in increased
profitability and cash flow. Although operating rates will be lower in the first
quarter of 1998 due to planned maintenance, strong operating results are
expected to return beginning in the second quarter of 1998 and continue for the
remainder of the year.

LCR's indebtedness has been scheduled to be refinanced in the second quarter of
1998.  In connection therewith, the Company anticipates that LCR would repay the
construction loan and subordinated loans made to LCR by Lyondell, including
those made in connection with the Upgrade Project, as well as subordinated loans
made to LCR by CITGO, including those made in connection with the Upgrade
Project.  Additional cash received in the refinancing will be distributed to
Lyondell and CITGO.  Lyondell proceeds are expected to be in the $400 million to
$600 million range.  Lyondell anticipates that it will use a portion of its
proceeds to repay Lyondell's $345 million note payable to Equistar.

Methanol demand growth is expected to slow in 1998.  Unscheduled outages in the
downstream markets have negatively impacted demand for methanol in the first
quarter of 1998.  New industry capacity added in the fourth quarter of 1997 is
expected to lead to price pressures that could continue through 1998.
Offsetting the demand and pricing pressures, natural gas feedstock prices have
dropped slightly from the stronger levels experienced in the last half of 1997.
As a result, margins are expected to be reduced in 1998 below the levels in
1997.

Lyondell's share of budgeted 1998 capital expenditures for Equistar, LCR and
Lyondell Methanol totals $116 million, $38 million and $10 million,
respectively.  The Equistar capital budget of $204 million includes spending for
the 460 million pound HDPE resin expansion at the Matagorda Facility, the
ethylene conversion to liquid feedstocks at the La Porte Facility, a
debottleneck at the Victoria Facility and other projects at the petrochemicals
and polymers facilities.  The LCR capital budget of $66 million includes
spending for process control upgrades, fluid catalytic cracker upgrade and other
projects at the Refinery. The Lyondell Methanol capital budget of $13 million
includes capital spending for a major maintenance turnaround scheduled to be
completed in the first quarter of 1999.  Capital expenditures are expected to be
funded primarily from the operating cash flow of the ventures.

Profitability and cash flows for the petrochemicals, polymers and refining
businesses are affected by industry supply and demand, feedstock cost
volatility, capital expenditures required to meet more stringent environmental
standards, repair and maintenance costs and downtime of production units due to
maintenance turnarounds.  Turnarounds on major units can have significant
financial impacts due to the associated loss of production, resulting in lower
profitability.

Management believes business conditions will be such that cash balances, cash
distributions from Equistar, LCR and Lyondell Methanol and existing lines of
credit will be adequate to meet future cash requirements for scheduled debt
repayments and to sustain for the reasonably foreseeable future the regular
quarterly dividend.  Management anticipates, in general, increased cash flow
from its businesses because of the creation of Equistar and the LCR venture,
which should provide greater financial flexibility to the Company.  Management
intends to accelerate cash flow from its investment in LCR as a result of LCR
replacing its current construction financing with longer-term financing and
distributing excess funds to the owners of LCR.  Management expects cash flow to
be in excess of the amounts needed to fund operations, debt repayments
(including the $345 million note payable to Equistar), and to maintain an
appropriate capital structure.  Management plans to maximize stockholder value
by investing excess cash flow in attractive growth opportunities or returning
excess cash flow to stockholders.

On March 20, 1998, Lyondell and Millennium announced an agreement to expand
Equistar with the addition of the ethylene, propylene and ethylene oxide and
derivatives businesses of Occidental Chemical Corporation, a subsidiary of
Occidental Petroleum.  This is expected to increase total value creation from
Equistar, through additional synergies created by leveraging costs over a larger
asset base.  It will also provide expanded diversification into products that
use ethylene as a feedstock.  The transaction, which is subject to regulatory
approval, is expected to close by mid-year 1998.  Lyondell's percentage
ownership in Equistar would decrease to 41 percent from the current 57 percent
ownership as a result of this transaction.

                                       38
<PAGE>
 
FORWARD-LOOKING STATEMENTS

Certain of the statements contained in this report, including those regarding
the Current Business Outlook, are "forward-looking statements" within the
meaning of the federal securities laws.  Although Lyondell believes the
expectations reflected in such forward-looking statements are reasonable, they
do involve certain assumptions, risks and uncertainties, and Lyondell can give
no assurance that such expectations will prove to have been correct.  The
Company's actual results could differ materially from those anticipated in these
forward-looking statements as a result of certain factors, including the
cyclical nature of the petrochemical, polymers and refining industries,
uncertainties associated with the United States and worldwide economies, current
and potential United States governmental regulatory actions, substantial
petrochemical and polymer capacity additions resulting in oversupply and
declining prices and margins, and operating interruptions (including leaks,
explosions, fires, mechanical failure, unscheduled downtime, transportation
interruptions, and spills and releases and other environmental risks).  Many of
such factors are beyond Lyondell's or its joint ventures' ability to control or
predict.  Management cautions against putting undue reliance on forward-looking
statements or projecting any future results based on such statements or present
or prior earnings levels.

All subsequent written and oral forward-looking statements attributable to the
Company and persons acting on its behalf are qualified in their entirety by the
cautionary statements contained in this section and elsewhere in this report.

                                       39
<PAGE>
 
ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA



                         INDEX TO FINANCIAL STATEMENTS
                                        


<TABLE>
<CAPTION>
                                                                                               
                                                                                      PAGE
                                                                                ----------------
<S>                                                                             <C> 
LYONDELL PETROCHEMICAL COMPANY

Report of Independent Accountants                                                     41
                                        
Financial Statements:  

         Consolidated Statements of Income and Retained Earnings (Deficit)            42
         Consolidated Balance Sheets                                                  43
         Consolidated Statements of Cash Flows                                        44
         Notes to Consolidated Financial Statements                                   45
  
EQUISTAR CHEMICALS, LP                                       

Report of Independent Accountants                                                     66
                                        
Financial Statements:

         Statement of Income                                                          67
         Balance Sheet                                                                68
         Statement of Partners' Capital                                               69
         Statements of Cash Flows                                                     70
         Notes to Financial Statements                                                71
                                        
LYONDELL-CITGO REFINING COMPANY LTD.                                                   

Overview                                                                              80
                                                                                          
Report of Independent Accountants                                                     81
                                                                                          
Financial Statements:                                                                      

         Statements of Income                                                         82
         Balance Sheets                                                               83
         Statements of Cash Flows                                                     84
         Statements of Members' Equity                                                85
         Notes to Financial Statements                                                86
</TABLE>
                                        

                                       40
<PAGE>
 
                         LYONDELL PETROCHEMICAL COMPANY
                                        
                       REPORT OF INDEPENDENT ACCOUNTANTS
                                        



To the Stockholders and Board of Directors
of Lyondell Petrochemical Company:

We have audited the accompanying consolidated balance sheets of Lyondell
Petrochemical Company as of December 31, 1997 and 1996, and the related
consolidated statements of income and retained earnings (deficit), and cash
flows for each of the three years in the period ended December 31, 1997.  These
financial statements are the responsibility of the Company's management.  Our
responsibility is to express an opinion on these financial statements based on
our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessingy
the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the consolidated financial position of Lyondell
Petrochemical Company as of December 31, 1997 and 1996, and the consolidated
results of its operations and its cash flows for each of the three years in the
period ended December 31, 1997 in conformity with generally accepted accounting
principles.



Coopers & Lybrand L.L.P.
Houston, Texas
February 16, 1998
(Except as to the information presented in Note 23, for which the date March 20,
1998)

                                       41
<PAGE>
 
                         LYONDELL PETROCHEMICAL COMPANY

       CONSOLIDATED STATEMENTS OF INCOME AND RETAINED EARNINGS (DEFICIT)

<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED DECEMBER 31
                                                  ----------------------------------------------
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNTS         1997              1996              1995  
- --------------------------------------------      ----------        -----------       ----------
<S>                                               <C>               <C>               <C> 
SALES AND OTHER OPERATING REVENUES (NOTE 4):                                            
     Unrelated parties                              $2,346            $4,734            $4,611
     Related parties                                   532               318               325
                                                  ----------        -----------       ----------
                                                     2,878             5,052             4,936
                                                  ----------        -----------       ----------
INCOME FROM EQUITY INVESTMENTS:
     LYONDELL-CITGO Refining Company Ltd.              102               - -               - -
     Equistar Chemicals, LP (before unusual            
     charge)                                            30               - -               - -
                                                  ----------        -----------       ----------
                                                       132               - -               - - 
                                                  ----------        -----------       ----------
GAIN ON SALE OF ASSETS                                 - -                30               - -
                                                  ----------        -----------       ----------
  
OPERATING COSTS AND EXPENSES:
Cost of sales:
          Unrelated parties                           1,827            4,320             3,801
          Related parties                               423              250               225
     Selling, general and administrative expenses       186              234               204
     Unusual charges (including $24 million from
          Equistar Chemicals, LP)                        40              - -               - -
                                                  ----------        -----------       ----------
                                                      2,476            4,804             4,230
     Operating income                                   534              278               706
                                                                        
Interest expense                                        (75)             (81)              (80)
Interest income                                          14                3                 6
Minority interest                                       (17)              (4)              (14)
                                                  ----------        -----------       ----------

Income before income taxes                              456              196               618

Provision for income taxes                              170               70               229
                                                  ----------        -----------       ----------

NET INCOME                                             $286             $126              $389
                                                  ==========        ===========       ==========

BASIC AND DILUTED EARNINGS PER SHARE                  $3.58            $1.58             $4.86
                                                  ==========        ===========       ==========

RETAINED EARNINGS (DEFICIT) AT BEGINNING OF YEAR       $193             $142             $(175)
     Net income                                         286              126               389
     Cash dividends                                     (72)             (72)              (72)
     OTHER                                              - -               (3)              - -
                                                  ----------        -----------       ----------

RETAINED EARNINGS AT END OF YEAR                       $407             $193              $142
                                                  ==========        ===========       ==========
</TABLE>

                                       42
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

                          CONSOLIDATED BALANCE SHEETS
<TABLE>
<CAPTION>
                                                                  DECEMBER 31
                                                        ------------------------------
MILLIONS OF DOLLARS                                        1997               1996
- -------------------                                     -----------      -------------
<S>                                                     <C>               <C> 
ASSETS
Current assets:
     Cash and cash equivalents                              $   86            $    68
     Accounts receivable:
          Trade                                                  1                394
          Related parties                                        4                 62
     Inventories                                               - -                294
     Prepaid expenses and other current assets                  12                 13
                                                        -----------      -------------  
          Total current assets                                 103                831
                                                        -----------      -------------  
Property, plant and equipment                                  138              4,313
Less accumulated depreciation and amortization                 (92)            (2,043)
                                                        -----------      -------------  
                                                                46              2,270
Investment in affiliates:
     LYONDELL-CITGO Refining Company Ltd. ("LCR")              104                - -
     Equistar Chemicals, LP                                  1,063                - -
Receivable from LCR                                            196                - -
Deferred charges and other assets                               47                175
                                                        -----------      -------------  
Total assets                                                $1,559            $ 3,276
                                                        ===========      =============  

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
     Accounts payable:
          Trade                                             $   87            $   474
          Related parties                                       97                  1
     Notes payable                                             100                 60
     Current maturities of long-term debt                      - -                112
     Other accrued liabilities                                  24                124
                                                        -----------      -------------  
          Total current liabilities                            308                771
                                                        -----------      -------------  
Long-term debt                                                 345              1,194
Other liabilities and deferred credits                          73                114
Deferred income taxes                                          209                157
Commitments and contingencies
Minority interest                                                5                609
Stockholders' equity:
     Preferred stock, $.01 par value, 80,000,000 shares
       authorized, none outstanding                            - -                - -
     Common stock, $1 par value, 250,000,000 shares
       authorized, 80,000,000 issued                            80                 80
     Additional paid-in capital                                158                158
     Retained earnings                                         407                193
     Treasury stock, at cost, 1,015,512 shares                 (26)               - -
                                                        -----------      -------------  
          Total stockholders' equity                           619                431
                                                        -----------      -------------  
Total liabilities and stockholders' equity                  $1,559            $ 3,276
                                                        ===========      =============  
</TABLE>
                See notes to consolidated financial statements.

                                       43
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
 
                                                                   FOR THE YEAR ENDED DECEMBER 31
                                                              -------------------------------------------
MILLIONS OF DOLLARS                                              1997            1996             1995
- -------------------                                           ----------      ----------        --------- 
<S>                                                           <C>             <C>               <C> 
CASH FLOWS FROM OPERATING ACTIVITIES:
     Net income                                                 $ 286            $ 126            $ 389
     Adjustments to reconcile net income to net
       cash provided by operating activities:
          Depreciation and amortization                            84              110               86
          Deferred income taxes                                    43               50                3
          Minority interest                                        17                4               14
          Gain on sale of assets                                  - -              (30)             - -
          Increase in accounts receivable                         (64)             (94)              (1)
          Increase in inventories                                 (37)             (29)             (36)
          Increase (decrease) in accounts payable                 (44)             160               54
          Net change in other working capital accounts             (2)               6               (1)
          Other                                                   (14)             (71)             (37)
                                                              ----------      ----------        --------- 
               Net cash provided by operating activities          269              232              471
                                                              ----------      ----------        --------- 

CASH FLOWS FROM INVESTING ACTIVITIES:
     Additions to property, plant and equipment                   (49)            (609)            (982)
     Proceeds from sales of assets                                - -               55              - -
     Purchases of short-term investments                          - -              (76)             - -
     Proceeds from sales of short-term investments                - -               76              - -
     Contributions and advances to affiliates                     (86)             - -              - -
     Distributions from affiliates in excess of earnings           72              - -              - -
     Deconsolidation of affiliate                                 (12)             - -              - -
                                                              ----------      ----------        --------- 
               Net cash used in investing activities              (75)            (554)            (982)
                                                              ----------      ----------        --------- 

CASH FLOWS FROM FINANCING ACTIVITIES:
     Minority owners' (distributions) contributions               (16)             146              176
     Net change in short-term debt                                 50              (43)              83
     Borrowings of long-term debt                                 - -              499              250
     Repayments of long-term debt                                (112)            (150)             (10)
     Repurchase of common stock                                   (26)             - -              - -
     Dividends paid                                               (72)             (72)             (72)
                                                              ----------      ----------        --------- 
         Net cash provided by (used in) financing activities     (176)             380              427
                                                              ----------      ----------        --------- 
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                   18               58              (84)
Cash and cash equivalents at beginning of period                   68               10               94
                                                              ----------      ----------        --------- 
Cash and cash equivalents at end of period                      $  86            $  68            $  10
                                                              ==========      ==========        ========= 
</TABLE>

                See notes to consolidated financial statements.

                                       44
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.  FORMATION OF THE COMPANY AND OPERATIONS

Lyondell Petrochemical Company ("Company" or "Lyondell") operates in the
petrochemicals, polymers and refining segments through its interests in Equistar
Chemicals, LP ("Equistar"), LYONDELL-CITGO Refining Company Ltd. ("LCR"), a
Texas limited liability company, and Lyondell Methanol Company, L.P. ("Lyondell
Methanol").  Equistar was formed on December 1, 1997 as a joint venture between
the Company and Millennium Chemicals Inc. ("Millennium") and is operated as a
limited partnership.  In December 1996, the Company sold an undivided interest
in its methanol facility to MCN Investment Corporation ("MCNIC") and created
Lyondell Methanol Company L.P. ("Lyondell Methanol"), a partnership with MCNIC
as the minority owner, to own and operate the methanol facility.

In 1996 and 1995, Lyondell operated in two segments: the petrochemicals segment,
which included the results of operations of the Company's petrochemicals and
polymers business, and the refining segment.  Beginning in 1997, the
petrochemicals segment was split into the petrochemicals and polymers segments.
The petrochemicals segment consists of: olefins including ethylene, propylene,
butadiene, butylenes and specialty products; aromatics including benzene and
toluene; methanol; methyl tertiary butyl ether ("MTBE"); refinery blending
stocks and ethyl alcohol.  Lyondell's interest in Lyondell Methanol for 1997 and
the petrochemicals business of Equistar for December 1997 are included in the
petrochemicals segment.

The polymers segment consists of Lyondell's operations in polyolefins including
high-density polyethylene ("HDPE"), low-density polyethylene and polypropylene.
The polymers, concentrates and compounds, and wire and cable businesses
contributed by Millennium to Equistar in December 1997 are also included in the
polymers segment.

The Company's operations in the refining segment are conducted through its
interest in LCR, a Texas limited liability company owned by subsidiaries of the
Company and CITGO Petroleum Corporation ("CITGO").  The refining segment
consists of refined petroleum products, including gasoline, low sulfur diesel,
and jet fuel; aromatics produced at LCR's full-conversion Houston, Texas
refinery ("Refinery"), including benzene, toluene, paraxylene and orthoxylene;
lubricants, including industrial lubricants, motor oils, white oils and process
oils; carbon black oil; sulfur; residual oil; petroleum coke fuel; olefins
feedstocks; and crude oil resales.  LCR completed a major upgrade project at the
Refinery ("Upgrade Project") during the first quarter of 1997 to enable the
facility to process substantial additional volumes of very heavy crude oil.  LCR
sells its principal refined products to CITGO (see Note 4).

From its formation in 1985 through June 1988, Lyondell operated as a division of
Atlantic Richfield Company ("ARCO").  In July 1988, ARCO transferred the
division's assets and liabilities along with additional pipeline assets, to its
wholly owned subsidiary, Lyondell Petrochemical Company, a Delaware corporation.
In January 1989, ARCO completed an initial public offering of approximately 50.1
percent of the Company's common stock. In August 1994, ARCO issued three-year
debt securities ("Exchangeable Notes") which were exchangeable upon maturity on
September 15, 1997 into Lyondell common stock or an equivalent cash value, at
ARCO's option.  On September 15, 1997, ARCO delivered shares of Lyondell common
stock to the holders of the Exchangeable Notes.  The Company purchased the
remaining 383,312 shares of common stock held by ARCO after the conversion.  As
of December 31, 1997, ARCO owns no shares of common stock of Lyondell.

Although during the previous five years the contribution to operating profits
made by the petrochemicals and polymers segments has been over five times
greater than the contribution to operating profits made by the refining segment,
this trend could be reversed in any particular year due to margin volatility
within the petrochemicals and petroleum refining industries.

                                       45
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)



2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation - The 1997 consolidated financial statements include the
accounts of the Company and its subsidiaries, including Lyondell Methanol.  LCR
is included in the consolidated financial statements of the Company in 1996 and
1995.  All significant transactions between the entities of the Company have
been eliminated from the consolidated financial statements.  The Company's
investments in LCR in 1997 and Equistar for December 1997 are shown as equity
investments and are not consolidated.

Revenue Recognition - Revenue from product sales is generally recognized upon
delivery of products to the customer.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid debt
instruments such as certificates of deposit, commercial paper and money market
accounts purchased with an original maturity date of three months or less.  Cash
equivalents are stated at cost, which approximates fair value.  The Company's
policy is to invest cash in conservative, highly rated instruments and limit the
amount of credit exposure to any one institution.  The Company performs periodic
evaluations of the relative credit standing of these financial institutions
which are considered in the Company's investment strategy.

The Company has no requirements for compensating balances in a specific amount
at a specific point in time.  The Company does maintain compensating balances
for some of its banking services and products.  Such balances are maintained on
an average basis and are solely at the Company's discretion.  As a result, none
of the Company's cash is restricted.

All investments in debt and equity securities are accounted for in accordance
with Statement of Financial Accounting Standards ("SFAS") No. 115, "Accounting
for Certain Investments in Debt and Equity Securities."  Management determines
the appropriate classification of investments in debt securities as trading,
available-for-sale or held-to-maturity at the time of purchase and reevaluates
such designation as of each balance sheet date.

Accounts Receivable - The Company, Equistar and LCR sell their products
primarily to companies in the petrochemicals and refining industries.  The
Company, Equistar and LCR perform ongoing credit evaluations of their customers'
financial condition and in certain circumstances require letters of credit from
them.  The Company's allowance for doubtful accounts receivable, which is
reflected in the consolidated balance sheet as a reduction of accounts
receivable, totaled $3 million at December 31, 1996.  The Company had no
significant allowance for doubtful accounts recorded at December 31, 1997.

Inventories - Inventories are stated at the lower of cost or market.  Cost is
determined on the last-in, first-out ("LIFO") basis except for materials and
supplies, which are valued at average cost.

Property, Plant and Equipment - Property, plant and equipment are recorded at
cost.  Depreciation of property, plant and equipment is computed using the
straight-line method over the estimated useful lives of the related assets as
follows.

     Manufacturing facilities and equipment    -  5 to 30 years
     Leased assets and improvements            -  5 to 20 years

Upon retirement or sale, the Company removes the cost of the assets and the
related accumulated depreciation from the accounts and reflects any resulting
gains or losses in income. The Company's policy is to capitalize interest cost
incurred on debt during the construction of major projects exceeding one year.

Turnaround Maintenance and Repair Expenses - Cost of repairs and maintenance
incurred in connection with turnarounds of major units at the Company's
manufacturing facilities exceeding $5 million are deferred and amortized on a
straight-line basis until the next planned turnaround, generally four to six
years.

                                       46
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


Environmental Remediation Costs - Expenditures related to investigation and
remediation of contaminated sites, which include operating facilities and waste
disposal sites, are accrued when it is probable a liability has been incurred
and the amount of the liability can reasonably be estimated.  Estimates have not
been discounted to present value.  Environmental remediation costs are expensed
or capitalized in accordance with generally accepted accounting principles.

In October 1996 the American Institute of Certified Public Accountants issued
Statement of Position 96-1 ("SOP 96-1"), "Environmental Remediation
Liabilities," which establishes new accounting and reporting standards for the
recognition and disclosure of environmental remediation liabilities.  The effect
of adoption of SOP 96-1 in 1997 did not have a material impact on the Company's
financial position or results of operations.

Exchanges - Crude oil and finished product exchange transactions, which are of a
homogeneous nature of commodities in the same line of business and do not
involve the payment or receipt of cash, are not accounted for as purchases and
sales.  Any resulting volumetric exchange balances are accounted for as
inventory in accordance with the normal LIFO valuation policy.  Exchanges
settled through payment and receipt of cash are accounted for as purchases and
sales.

Income Taxes - Deferred income taxes result from temporary differences in the
recognition of revenues and expenses for tax and financial reporting purposes
and are calculated based upon cumulative book and tax differences in the
consolidated balance sheets in accordance with SFAS No. 109, "Accounting for
Income Taxes."

Basic and Diluted Earnings per Share - In February 1997, the Financial
Accounting Standards Board ("FASB") issued SFAS No. 128, "Earnings per Share."
SFAS No. 128 establishes standards for computing and presenting earnings per
share ("EPS").  SFAS No. 128 replaces the presentation of primary EPS with a
presentation of basic EPS and also requires dual presentation of basic and
diluted EPS on the face of the income statement for all entities with complex
capital structures.  There was no impact on 1997, 1996 or 1995 from the
Company's adoption of SFAS No. 128.

Use of Estimates - The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period.  Actual results could differ from those estimates.

Reclassifications - Certain previously reported amounts have been restated to
conform to classifications adopted in 1997.


3.  EQUISTAR CHEMICALS, LP

Equistar was formed on December 1, 1997 as a joint venture between the Company
and Millennium and is operated as a limited partnership.  Lyondell contributed
substantially all of the assets comprising its petrochemicals and polymers
business segments, as well as a $345 million note, in exchange for a 57 percent
interest in Equistar, held through two wholly owned subsidiaries.  Millennium
contributed substantially all of the assets comprising its polyethylene and
related products, performance polymers and ethyl alcohol businesses, which had
been held in Millennium Petrochemicals, Inc., a wholly owned subsidiary of
Millennium.  In exchange, Millennium received a 43 percent interest in Equistar,
Equistar repaid $750 million of debt due to Millennium from its contributed
business and Millennium retained $250 million of certain accounts receivable.
Equistar owns and operates the petrochemicals and polymers businesses
contributed by the two companies. Because certain management decisions are
jointly controlled by Lyondell and Millennium, Lyondell accounts for its
investment in Equistar under the equity method of accounting, similar to the
accounting for its investment in LCR.

Summarized financial information for Equistar is as follows (in millions of
dollars).

                                       47
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


<TABLE>
<CAPTION>
 
BALANCE SHEET
                                                   DECEMBER 31
                                                       1997
                                                   -----------  
<S>                                                <C>
Total current assets                                  $1,193
Property, plant and equipment, net                     2,118
Goodwill, net                                          1,139
Deferred charges and other assets                        151
                                                   -----------
Total assets                                          $4,601
                                                   ===========
 
Current maturities of long-term debt                  $   36
Other current liabilities                                316
Long-term debt                                         1,512
Other liabilities and deferred credits                    34
Partners' capital                                      3,048
Note receivable from Lyondell                           (345)
                                                   -----------  
Total liabilities and partners' capital               $4,601
                                                   ===========  

                                                   FOR THE ONE
                                                   MONTH ENDED
                                                   DECEMBER 31
INCOME STATEMENT                                      1997    
                                                   -----------  
Sales and other operating revenues                    $  365
Cost of sales                                            287
Selling, general and administrative expenses              21
Unusual charge                                            42
                                                   -----------  
Operating income                                          15
Interest expense, net                                      8
                                                   -----------  
Net income                                            $    7
                                                   ===========  
SELECTED CASH FLOW INFORMATION
Depreciation and amortization                         $   19
Changes in working capital                                69
Additions to property, plant and equipment               (12)
</TABLE>

Lyondell's equity income from investment in Equistar is presented on the
consolidated income statement as Lyondell's $30 million share of Equistar's
income before the unusual charge for December 1997. Lyondell's $24 million share
of the Equistar unusual charge is included in the unusual charges line on the
consolidated income statement (see Note 7).


4.  LYONDELL-CITGO REFINING COMPANY LTD.

In July 1993, LCR was formed to own and operate the Company's refining business.
LCR completed the Upgrade Project at the Refinery during the first quarter of
1997, which enables the facility to process substantial additional volumes of
very heavy crude oil.  As a result of the completion of the Upgrade Project,
effective April 1, 1997 the participation interests changed from 86 percent and
14 percent to 58.5 percent and 41.5 percent for Lyondell and CITGO,
respectively, to reflect CITGO's equity contribution in the Upgrade Project.
CITGO has a one-time option to increase its participation interest in LCR up to
50 percent by making an additional equity contribution.  Net income before
depreciation expense for the period is allocated to LCR's owners based on
participation interests.  Depreciation expense is allocated to the owners based
on contributed assets.

Pursuant to contractual arrangements and concurrent with the completion of the
Upgrade Project, the authority and responsibility for certain management
decisions previously decided by majority vote, and therefore controlled by
Lyondell, changed to unanimous vote resulting in expanded joint control of LCR
by Lyondell and CITGO.  

                                       48
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


Consequently, effective January 1, 1997, Lyondell began accounting for its
investment in LCR under the equity method of accounting, meaning that the
operations of LCR are no longer consolidated line by line with those of
Lyondell. Lyondell's portion of LCR's net earnings are included in the
consolidated statements of income as income from equity investment and
Lyondell's portion of LCR's net assets appear on a single line in the
consolidated balance sheets as investment in affiliate. Cash advances to and
distributions in excess of earnings from LCR are reflected as individual line
items on the consolidated statements of cash flows.

The following unaudited pro forma financial information presents the financial
position, results of operations and cash flows of the Company as of and for the
year ended December 31, 1996 using the equity method of accounting for
Lyondell's investment in LCR as if the change in accounting method had been
effective January 1, 1996.  This unaudited pro forma information may not be
indicative of results that will be obtained in the future.
<TABLE>
<CAPTION>
 
BALANCE SHEETS                                                      PRO FORMA             AS REPORTED          
- --------------                                                    EQUITY METHOD           CONSOLIDATED         
MILLIONS OF DOLLARS                                             DECEMBER 31, 1996      DECEMBER 31, 1996       
- --------------------                                          --------------------    --------------------     
<S>                                                            <C>                  <C>                        
Current assets                                                             $  619               $  831         
Property, plant and equipment, net                                            893                2,270         
Investment in affiliate                                                        83                  - -         
Receivable from affiliate                                                     177                  - -         
Deferred charges and other assets                                             118                  175         
                                                              --------------------    --------------------     
Total assets                                                               $1,890               $3,276         
                                                              ====================    ====================     
Notes payable                                                              $   50               $   60         
Current maturities of long-term debt                                          112                  112         
Other current liabilities                                                     323                  599     
                                                              --------------------    -------------------- 
Total current liabilities                                                     485                  771         
Long-term debt                                                                744                1,194         
Other liabilities and deferred credits                                         70                  114         
Deferred income taxes                                                         157                  157         
Minority interest                                                               3                  609         
Total stockholders' equity                                                    431                  431         
                                                              --------------------    --------------------      
Total liabilities and stockholders' equity                                 $1,890               $3,276         
                                                              ====================    ====================      
INCOME STATEMENTS                                                 PRO FORMA               AS REPORTED          
- -----------------                                               EQUITY METHOD             CONSOLIDATED         
                                                               FOR THE YEAR ENDED       FOR THE YEAR ENDED     
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNTS                   DECEMBER 31, 1996         DECEMBER 31, 1996     
- --------------------------------------------                  --------------------    --------------------     
Sales and other operating revenues                                         $2,644               $5,052         
Income from equity investment                                                   2                  - -         
Gain on sale of assets                                                         30                   30         
Cost of sales                                                               2,228                4,570         
Selling, general and administrative expenses                                  172                  234         
                                                              --------------------    --------------------      
Operating income                                                              276                  278         
Interest expense                                                              (79)                 (81)        
Interest income                                                                 1                    3         
Minority interest                                                              (2)                  (4)        
                                                              --------------------    --------------------      
Income before income taxes                                                    196                  196         
Provision for income taxes                                                     70                   70         
                                                              --------------------    --------------------      
Net income                                                                 $  126               $  126         
                                                              ====================    ====================      
Earnings per share                                                          $1.58                $1.58          
                                                              ====================    ====================      
</TABLE>

                                       49
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


<TABLE>
<CAPTION>
STATEMENTS OF CASH FLOWS                               PRO FORMA                AS REPORTED    
- ------------------------                             EQUITY METHOD             CONSOLIDATED    
                                                  FOR THE YEAR ENDED        FOR THE YEAR ENDED 
MILLIONS OF DOLLARS                                DECEMBER 31, 1996         DECEMBER 31, 1996 
- -------------------                               -------------------       ------------------   
<S>                                               <C>                       <C> 
Net income                                                     $ 126                   $ 126      
Depreciation and amortization                                     74                     110      
Deferred income taxes                                             50                      50      
Minority interest                                                  2                       4      
Gain on sale of assets                                           (30)                    (30)     
Changes in working capital and other                             (92)                    (28)     
                                                  -------------------       ------------------    
     Net cash provided by operating activities                   130                     232      
                                                  -------------------       ------------------    
Additions to property, plant and equipment                       (80)                   (609)     
Proceeds from sales of assets                                     55                      55      
Contributions and advances to affiliate, net                     (82)                    - -      
Deconsolidation of affiliate                                      (4)                    - -      
                                                  -------------------       ------------------    
     Net cash used in investing activities                      (111)                   (554)     
                                                  -------------------       ------------------    
Minority owners' contributions                                     2                     146      
Net change in short-term debt                                    (53)                    (43)     
Borrowings of long-term debt                                     300                     499      
Repayments of long-term debt                                    (150)                   (150)     
Dividends paid                                                   (72)                    (72)     
                                                  -------------------       ------------------    
     Net cash provided by financing activities                    27                     380      
                                                  -------------------       ------------------    
Increase in cash and cash equivalents                             46                      58      
Cash and cash equivalents, beginning of period                    10                      10      
                                                  -------------------       ------------------    
Cash and cash equivalents, end of period                       $  56                   $  68      
                                                  ===================       ==================    
</TABLE>

Summarized financial information for LCR is as follows (in millions of dollars).
The results below include a restatement for a pricing adjustment between LCR and
Lyondell recorded in 1996 retroactive to 1993.

<TABLE>
<CAPTION>
 
BALANCE SHEETS                                               DECEMBER 31
                                                  --------------------------------
                                                     1997                  1996
                                                  ----------          ------------  
<S>                                               <C>                 <C> 
Total current assets                                $   243              $   273
Property, plant and equipment, net                    1,391                1,391
Deferred charges and other assets                        47                   56
                                                  ----------          ------------  
Total assets                                        $ 1,681              $ 1,707
                                                  ==========          ============  
Total current liabilities                           $   293              $   373
Long-term debt                                          663                  627
Other liabilities and deferred credits                   52                   44
Members' equity                                         673                  663
                                                  ----------          ------------  
Total liabilities and members' equity               $ 1,681              $ 1,707
                                                  ==========          ============  
 
</TABLE>

                                       50
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


<TABLE>
<CAPTION>
 
 
INCOME STATEMENTS                                         FOR THE YEAR ENDED DECEMBER 31
                                              --------------------------------------------
                                                  1997           1996             1995
                                              -----------   -------------    -------------
<S>                                             <C>       <C>             <C>
Sales and other operating revenues               $2,695          $2,816          $2,651
Cost of sales                                     2,442           2,750           2,462
Selling, general and administrative expenses         72              62              58
                                              -----------   -------------    -------------
Operating income                                    181               4             131
Interest expense, net                                35             - -              (2)
State income taxes                                    1             - -               3
                                              -----------   -------------    -------------
Net income                                       $  145          $    4          $  130
                                              ===========   =============    ============= 
 
STATEMENTS OF CASH FLOWS
Depreciation and amortization                        91              74              32
Net changes in working capital                      (26)            (49)             25
Additions to property, plant and equipment          (85)            (80)           (506)
</TABLE>

Included in sales and other operating revenues above are $181 million, $175
million and $289 million in sales to Lyondell for the eleven months ended
November 30, 1997 and the years ended December 31, 1996 and 1995 respectively.
Sales to Equistar included above were $7 million for December 1997.  In
addition, LCR purchased $325 million, $234 million and $193 million, primarily
product purchases, from Lyondell for the eleven months ended November 30, 1997,
and the years ended December 31, 1996 and 1995, respectively, which is included
in LCR's cost of sales.  Purchases from Equistar in December 1997 included in
LCR's cost of sales totaled $28 million.

The Company has various service and cost sharing arrangements with LCR.
Billings to LCR were approximately $7 million, $11 million, and $16 million for
the years ended December 31, 1997, 1996, and 1995, respectively.  Billings from
LCR were approximately $5 million, $3 million, and $11 million for the years
ended December 31, 1997, 1996 and 1995, respectively.

LCR has a long-term crude supply contract ("Crude Supply Contract") with
Lagoven, S.A., now known as PDVSA Petroleo y Gas, S.A. ("PDVSA Oil"), an
affiliate of CITGO.  The Crude Supply Contract incorporates a formula price
based on the market value of a slate of refined products deemed to be produced
from each particular crude oil or feedstock, less: (i) certain deemed refining
costs, adjustable for inflation and energy costs; (ii) certain actual costs,
including crude transportation costs, import duties and taxes; and (iii) a
deemed margin, which varies according to the grade of crude oil or other
feedstock delivered.  Deemed margins and deemed costs are adjusted periodically.
These adjustments are based on inflation rates and energy costs, however, deemed
margin adjustments can be less than the rate of inflation.  Because deemed
operating costs and the slate of refined products deemed to be produced for a
given barrel of crude oil or other feedstock do not necessarily reflect the
actual costs and yields in any period and because the market value of the
refined products used in the pricing formula does not necessarily reflect the
actual price received for the refined products, the actual refining margin
earned by LCR under the Crude Supply Contract will vary depending on, among
other things, the efficiency with which LCR conducts its operations during such
period.

Despite the limitations discussed above, the Crude Supply Contract reduces the
volatility of earnings and cash flow of the refining operations of LCR
irrespective of market fluctuations of either crude oil or refined products.
Specifically, if the market value of refined products "deemed" to be produced
from the Venezuelan crude oil increases, the "deemed" cost of crude oil to LCR
will also increase.  Alternatively, if the market value of refined products
"deemed" to be produced from the Venezuelan crude oil decreases, the "deemed"
cost of crude oil to LCR will also decrease.  This results in relatively stable
"deemed" margins regardless of refined products market volatility.  If the
actual yields, costs or volumes differ substantially from those contemplated by
the Crude Supply Contract, the benefits of this agreement to LCR could be
substantially different than anticipated.

In addition, under the terms of a long-term product sales agreement ("Products
Agreement"), CITGO purchases substantially all of the refined products produced
at the Refinery.  Both PDVSA Oil and CITGO are direct or indirect wholly owned
subsidiaries of Petroleos de Venezuela, S.A., the national oil company of
Venezuela.  LCR is required to 

                                       51
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


purchase, and PDVSA Oil is required to sell, sufficient crude oil to satisfy
LCR's coking capacity, or a minimum of 200,000 barrels per day and up to 230,000
barrels per day of very heavy Venezuelan crude oil. PDVSA Oil has the right, but
not the obligation, to supply incremental amounts above 230,000 barrels per day.


5.  LYONDELL METHANOL COMPANY, L.P.

Lyondell Methanol was formed in December 1996 by Lyondell and MCNIC to own and
operate the methanol facility at the Channelview Facility.  MCNIC has a 25
percent interest in Lyondell Methanol.  Lyondell has a 75 percent interest in
Lyondell Methanol and serves as managing partner and operator.

In accordance with the guidance in Emerging Issues Task Force Issue No. 96-16
("EITF 96-16") issued by the FASB in May 1997, Lyondell will account for its
investment in Lyondell Methanol under the equity method of accounting effective
January 1, 1998.

During 1997, Lyondell Methanol revenues were $165 million and net income was $58
million on a book depreciation basis.


6.  ACQUISITION OF ALATHON/(R)/ HIGH-DENSITY POLYETHYLENE BUSINESS

In May 1995, the Company acquired Occidental Chemical Corporation's Alathon/(R)/
high-density polyethylene ("HDPE") business ("ALATHON Business") for $356
million including certain direct costs, plus approximately $64 million for
inventory.  Assets involved in the purchase included resin production facilities
at Victoria and Matagorda, Texas, associated research and development activities
and the rights to the Alathon/(R)/ trademark.  These facilities have a combined
annual production capacity of approximately 1.5 billion pounds of HDPE.  The
Company financed the acquisition from internal cash and $230 million of short-
term borrowings from its existing financing arrangements.

The following unaudited pro forma information combines the results of operations
of the Company and the ALATHON Business for the year ended December 31, 1995 and
assumes the acquisition of the ALATHON Business occurred on January 1, 1995.
This unaudited pro forma information may not be indicative of results that would
have actually resulted if this transaction had occurred on January 1, 1995 or
which may be obtained in the future.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNT            1995
- -------------------------------------------          -------
<S>                                                  <C>
Sales and other operating revenues                    $5,130
Net income                                               409
Earnings per share                                      5.11
 
</TABLE>

7.  UNUSUAL CHARGES

During 1997, the Company recognized $40 million of unusual charges related to
the formation of Equistar, comprised primarily of costs associated with a
reduction of the workforce and consolidation of certain operations.  Certain
costs were paid by Equistar and allocated to Lyondell and Millennium in
accordance with ownership percentages.  Lyondell also incurred costs related to
the early termination of incentive compensation plans and executive severance.
The unusual charges consist of the following items (in millions of dollars).
<TABLE>
<CAPTION>
 
<S>                                                                       <C>
Lyondell's 57 percent share of the Equistar unusual charge                    $  24
Lyondell incentive compensation and executive severance                          16
                                                                          -----------
     Total                                                                    $  40
                                                                          ===========
</TABLE> 

                                       52
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


8.  SUPPLEMENTAL CASH FLOW INFORMATION
 
Supplemental cash flow information is summarized as follows.

<TABLE> 
<CAPTION> 
MILLIONS OF DOLLARS                                               1997                 1996              1995
- -------------------                                            -----------          ----------       ---------- 
<S>                                                            <C>                  <C>              <C>
Cash paid during the year for:
   Interest:
      Paid                                                         $  66               $ 103            $  83
      Less amount capitalized                                        - -                  32                6
                                                               -----------          ----------       ----------  
      Net                                                          $  66               $  71            $  77
                                                               ===========          ==========       ==========  
   Income taxes                                                    $ 125               $  42            $ 252 
                                                               ===========          ==========       ==========  
</TABLE>

At December 31, 1996 and 1995, property, plant and equipment included $9 million
and $53 million, respectively, of non-cash additions which related to accounts
payable accruals.  No such amounts are included at December 31, 1997.

The petrochemicals and polymers businesses contributed by the Company to
Equistar on December 1, 1997 included non-cash net assets with a net book value
of $762 million, including $381 million of accounts receivable, $233 million of
inventory, $826 million of net property, plant and equipment and $745 million of
long-term debt including the current portion of long-term debt.  In addition,
the Company contributed a $345 million Term Note payable to Equistar.


9.  FINANCIAL INSTRUMENTS

The fair value of all financial instruments included in current assets and
current liabilities, including cash and cash equivalents, accounts receivable,
accounts payable and notes payable, approximated their carrying value due to
their short maturity. The fair value of the long-term debt payable to Equistar
approximated its carrying value due to its variable interest rate.  Based on the
borrowing rates currently available to the Company for debt with terms and
average maturities similar to the Company's debt portfolio, the fair value of
the Company's long-term debt, including amounts due within one year, was $1.236
billion at December 31, 1996.


10.  RELATED PARTY TRANSACTIONS

Atlantic Richfield Company Sales to ARCO, excluding sales to ARCO Chemical
Company, were $31 million in 1996 and $4 million in 1995.  Costs of sales and
selling expenses include charges from ARCO, excluding costs to ARCO Chemical
Company, of $23 million in 1996 and $28 million in 1995.  The Company purchased
383,312 shares of common stock held by ARCO after the conversion of the
Exchangeable Notes on September 15, 1997 at a price of $25.66 per share.

Sales to ARCO Chemical Company, an ARCO affiliate, consisting of propylene,
MTBE, benzene, ethylene, methanol and other products and services, were $206
million in 1997, $287 million in 1996 and $321 million in 1995.

In July 1996, a fire occurred at the ARCO PipeLine Company meter station located
within the Channelview Facility.  The fire forced the shutdown of the entire
Channelview Facility for several days and more than two weeks for some units.
The Company recovered lost profits from ARCO PipeLine Company for this shutdown.
The recovery was included in 1996 reported results.

                                       53
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


LYONDELL-CITGO Refining Company Ltd. During 1997, the Company received interest
of approximately $12 million for interest on loans related to funding a portion
of the upgrade project and certain other capital expenditures at the Refinery.


11.  INVENTORIES

The Company's inventory was contributed to Equistar on December 1, 1997.  At
December 31, 1996 the Company had total inventory of $294 million, which was
comprised of $47 million of petrochemicals, $34 million of polymers, $172
million of crude oil and refined products, and $41 million of materials and
supplies.

For the years ended December 31, 1997 and 1996, the Company increased cost of
sales by approximately $1 million and $2 million, respectively; and for the year
ended December 31, 1995, the Company reduced cost of sales by approximately $2
million, all associated with the reduction in LIFO inventories.  The excess of
the current cost of inventories over book value was approximately  $189 million
at December 31, 1996.


12.  PROPERTY, PLANT AND EQUIPMENT

The Company's manufacturing facilities and equipment at December 31, 1997 are
owned by Lyondell Methanol.  The components of property, plant and equipment and
their gross value at December 31, 1997 and 1996 were as follows.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS                                1997         1996   
- -------------------                             ----------   ---------- 
<S>                                                <C>        <C>     
Manufacturing facilities and equipment             $ 138       $3,329 
Construction projects in progress                    - -          953 
Land                                                 - -           28 
Leased assets and improvements                       - -            3 
                                                ----------   ----------  
    Total property, plant and equipment            $ 138       $4,313  
                                                ==========   ==========  
</TABLE>

Total interest cost incurred during 1997, 1996 and 1995 was approximately $75
million, $114 million and $86 million, respectively, of which approximately $33
million in 1996 and $6 million in 1995 was capitalized.  No interest was
capitalized in 1997.


13.  DEFERRED CHARGES AND OTHER ASSETS

Deferred charges and other assets at December 31, 1997 and 1996 were as follows.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS                                1997        1996
- -------------------                             ----------   ----------   
<S>                                            <C>           <C>
Company owned life insurance                      $  43        $  39
Deferred turnaround costs                             1           81
Deferred software costs                             - -           32
Other                                                 3           23
                                                ----------   ----------    
    Total deferred charges and other assets       $  47        $ 175 
                                                ==========   ==========     
</TABLE> 

                                       54
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


14.  OTHER ACCRUED LIABILITIES

Other accrued liabilities at December 31, 1997 and 1996 were as follows.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS                                1997         1996    
- -------------------                             ----------   ---------- 
<S>                                             <C>           <C>        
Accrued taxes other than income                     $  11       $  35
Accrued payroll                                         6          37
Accrued interest                                        2          18
Income taxes                                          - -           6
Other                                                   5          28
                                                ----------   ----------
    Total other accrued liabilities                 $  24       $ 124 
                                                ==========   ==========
 
</TABLE>

15.  LONG-TERM DEBT AND FINANCING ARRANGEMENTS

Long-term debt at December 31, 1997 and 1996 was comprised of the following.
<TABLE>
<CAPTION>
 
 
MILLIONS OF DOLLARS                                1997         1996    
- -------------------                             ----------   ----------  
<S>                                             <C>           <C> 
8.25% Notes due in 1997                             $ - -       $  100
10.00% Notes due in 1999                              - -          150
9.125% Notes due in 2002                              - -          100
6.5% Notes due in 2006                                - -          150
7.55% Debentures due in 2026                          - -          150
LCR 5-year term credit facility                       - -          450
Medium-term notes (1998-2005)                         - -          206
Term note to Equistar                                 345          - -
                                                ----------   ----------   
                                                      345        1,306
Less current portion                                  - -          112
                                                ----------   ----------   
    Total long-term debt                            $ 345       $1,194 
                                                ==========   ==========   
</TABLE>

The 8.25% Notes due in 1997 and $12 million of the medium-term notes were paid
in 1997 prior to the contribution of the remaining long-term debt, including
current maturities of long-term debt, to Equistar on December 1, 1997. Lyondell
remains liable on the debt, which totaled $744 million at December 31,1997,
until its maturity.

On December 1, 1997, the Company entered into a $345 million Term Note Agreement
with Equistar.  The note bears interest at LIBOR, which was 5.7 percent at
December 31, 1997.  The note matures on the earlier of three years or thirty
days following a refinancing of LCR which results in the payment of LCR's $450
million term construction loan and a distribution to the Company of at least
$345 million.

Effective, December 1, 1997, the Company has a 364-day, $225 million revolving
credit facility ("Facility") with a group of banks, which replaced the five-year
$400 million revolving credit facility.  Borrowings under the Facility bear
interest at either the eurodollar or prime rates or based on a competitive
auction feature wherein the interest rate can be established by competitive bids
submitted by the sponsoring banks, all at the Company's option.  The Facility is
available for working capital and general corporate purposes as needed and
contains covenants relating to disposition of assets, mergers and
consolidations, and certain ratios.  At December 31, 1997, no amounts were
outstanding under this Facility.

The Company also has uncommitted lines of credit totaling $150 million with
banks and other financial institutions.  These uncommitted lines of credit
provide the Company with additional borrowing flexibility and potentially more
competitive interest rates.  The Company can borrow money on these uncommitted
lines of credit on such terms as may be mutually agreed upon at the time amounts
are borrowed.  The lines of credit can be terminated by the 

                                       55
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


lenders, in their sole discretion, on short notice. As of December 31, 1997, the
Company had $100 million outstanding under these uncommitted lines of credit.


16.  STOCKHOLDERS' EQUITY

Dividends - During 1997, 1996 and 1995, the Company paid regular quarterly
dividends of $.225 per share of common stock outstanding.

Earnings per Share - Basic and diluted earnings per share for all periods
presented are computed based on the weighted average number of shares
outstanding for the periods, which was 79,795,788 shares for the year ended
December 31, 1997, and 80,000,000 shares for 1996 and 1995.  Options to purchase
159,173 shares of common stock at $30 per share were outstanding during 1997 but
were not included in the computation of diluted earnings per share because of
their anti-dilutive effect.

Treasury Stock - Treasury stock is acquired under a resolution the Board of
Directors adopted in September 1997 authorizing the Company to purchase, from
time to time, shares of the Company's common stock not to exceed $75 million in
the aggregate.  The Company purchased 1,015,512 shares through December 31, 1997
for approximately $26 million.

Rights to Purchase Common Stock - On December 8, 1995, the Board of Directors of
Lyondell declared a dividend of one right ("Right") for each outstanding share
of the Company's common stock to stockholders of record on December 20, 1995.
The Rights become exercisable upon the earlier of (i) ten days following a
public announcement by another entity that it has acquired beneficial ownership
of 15 percent or more of the outstanding shares of common stock, or (ii) ten
business days following the commencement of a tender offer or exchange offer to
acquire beneficial ownership of 15 percent or more of the outstanding shares of
common stock, excluding ARCO, except under certain circumstances.  The Rights
expire at the close of business on December 8, 2005 unless earlier redeemed at a
price of $.0005 per Right or exchanged by the Company as described in the Rights
Agreement dated as of December 8, 1995.

Preferred Stock - The Company has authorized 80,000,000 shares of preferred
stock, $.01 par value, of which none were issued or outstanding at December 31,
1997.

Stock Options - The Company's Executive Long-Term Incentive Plan ("LTI Plan")
became effective in November 1988.  The last stock options granted under the LTI
Plan were granted in March 1994.  No additional stock option grants will be made
under the LTI Plan.  The LTI Plan provided, among other compensation awards, for
the granting to officers and other key management employees of non-qualified
stock options for the purchase of up to 1,295,000 shares of the Company's common
stock.  The number of options exercisable each year is equal to 25 percent of
the number granted after each year of continuous service starting one year from
the date of grant.  The LTI Plan provided that the option price per share was
not less than 100 percent of the fair market value of the stock on the effective
date of the grant.  As of December 31, 1997, options covering 732,160 shares
were outstanding under the LTI Plan with a weighted average remaining life of 5
years, of which 675,579 were exercisable at prices ranging from $18.25 to $30.00
per share.  The following summarizes stock option activity for the LTI Plan.
<TABLE>
<CAPTION>
 
                                                                            OPTION PRICE               
                                                        NUMBER                AVERAGE                  
MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS         OF SHARES              PER SHARE            TOTAL 
- ---------------------------------------------       --------------        ----------------      ---------- 
<S>                                                 <C>                   <C>                    <C> 
Balance, January 1, 1996                               948,256               $23.26              $ 22
  Exercised                                           (204,454)               22.64                (5)
                                                    --------------                              ----------  
Balance, December 31, 1996                             743,802                23.43                17
  Exercised                                            (11,642)               19.15                --
                                                    --------------                              ----------  
Balance, December 31, 1997                             732,160                23.50              $ 17
                                                    ==============                              ==========  

</TABLE>

                                       56
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


The Company's Incentive Stock Option Plan ("ISO Plan"), a tax qualified plan,
became effective in January 1989.  The last stock options granted under the ISO
Plan were granted in March 1993.  No additional grants will be made under the
ISO Plan.  All employees of the Company who were not on the executive payroll
were eligible to participate in the ISO Plan, subject to certain restrictions.
Various restrictions apply as to when and to the number of stock options that
may be exercised during any year.  As of December 31, 1997, options covering
156,751 shares were outstanding at prices ranging from $19.44 to $30.00 per
share.  These options were held by 719 eligible employees and expire in January
1999.  At December 31, 1997, 180 stock options were exercisable at an average
exercise price of $19.44.  The following summarizes stock option activity for
the ISO Plan.
<TABLE>
<CAPTION>
 
 
                                                                            OPTION PRICE               
                                                        NUMBER                AVERAGE                  
MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS         OF SHARES              PER SHARE            TOTAL 
- ---------------------------------------------       --------------        ----------------      ---------- 
<S>                                                 <C>                   <C>                    <C> 
Balance, January 1, 1996                               189,553                $29.64               $   6
  Canceled/forfeited                                   (10,303)                28.51                  --
  Exercised                                             (3,446)                19.44                  --
                                                    --------------                              ----------  
Balance, December 1, 1996                              175,804                 29.91                   6
  Canceled/forfeited                                   (18,250)                29.68                  (1)
  Exercised                                               (803)                19.44                  --
                                                    --------------                              ----------  
Balance, December 31, 1997                             156,751                 29.99                   5
                                                    ==============                              ==========  

</TABLE>


17.  RETIREMENT PLANS

All full-time regular Lyondell, Equistar and LCR employees are covered by
defined benefit pension plans.  Retirement benefits are based on years of
service and the employee's highest three consecutive years of compensation
during the last ten years of service.  The funding policy for these plans is to
make periodic contributions as required by applicable law.  Lyondell, Equistar
and LCR accrue pension costs based on an actuarial valuation and fund the plans
through contributions to pension trust funds separate from Lyondell, Equistar or
LCR's funds. Lyondell, Equistar and LCR also have unfunded supplemental
nonqualified retirement plans which provide pension benefits for certain
employees in excess of the tax qualified plans' limits.

The following table sets forth the funded status of Lyondell's retirement plans
and the amounts recognized in the Company's consolidated balance sheets at
December 31, 1997 and 1996.  The funded status of LCR's retirement plans are
included in 1996 amounts.  In connection with the formation of Equistar, no
pension assets or obligations were contributed by Lyondell to Equistar.
However, the employees transferred to Equistar effective December 1, 1997 became
fully vested and will no longer accrue service with Lyondell.

                                       57
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


<TABLE>
<CAPTION>
 
 
                                                                     1997                                       1996    
                                                    -------------------------------------      ------------------------------------
                                                      PLANS WITH             PLANS WITH           PLANS WITH            PLANS WITH
                                                       ASSETS IN               ABO IN             ASSETS IN               ABO IN
                                                       EXCESS OF              EXCESS OF           EXCESS OF              EXCESS OF
MILLIONS OF DOLLARS                                       ABO                  ASSETS                ABO                  ASSETS
- -------------------                                 --------------        ---------------      ---------------       -------------- 

<S>                                                    <C>                     <C>                 <C>                     <C> 
Actuarial present value of benefit obligations:                                                                   
  Vested benefit obligation                             $  73                     $   6                $  85             $       7
                                                    ==============        ===============      ===============       ============== 

  Accumulated benefit obligation ("ABO")                $  78                     $   7                $  94             $       7
                                                    ==============        ===============      ===============       ==============
  Projected benefit obligation                          $ 125                     $  11                $ 150             $      15
Plan assets at fair value, primarily
  stocks and bonds                                        102                        --                  122                    --
                                                    --------------        ---------------      ---------------       --------------
Projected benefit obligation in of plan
  assets                                                  (23)                      (11)                 (28)                  (15)
Unrecognized net loss                                      19                         2                   11                     7
Prior service cost not yet recognized in
  pension cost                                              1                         2                    4                     2
Remaining unrecognized net asset                           (2)                       --                   (4)                   (1)
                                                    --------------        ---------------      ---------------       --------------
Net pension liability                                   $  (5)                    $(7)                 $ (17)            $      (7)
                                                    ==============        ===============      ===============       ==============
 
The Company's net periodic pension cost for 1997, 1996 and 1995 included the following components.

MILLIONS OF DOLLARS                                                 1997                    1996                    1995    
- ---------------------------                                     -----------              ----------              ---------  
Service cost - benefits earned during the period                   $   6                   $  10                   $   8  
Interest cost on projected benefit obligations                        10                      12                       9  
Actual gain on plan assets                                           (13)                    (19)                    (20) 
Net amortization and deferral                                          7                      11                      13  
                                                                -----------              ----------              --------- 
Net periodic pension cost                                          $  10                   $  14                   $  10   
                                                                ===========              ==========              ========= 
</TABLE>

The assumptions used at December 31, 1997, 1996 and 1995, in determining the net
periodic pension cost and net pension liability shown above were as follows.
<TABLE>
<CAPTION>
 
PERCENT                                                             1997                    1996                    1995   
- -------                                                         -----------              ----------              ---------  
<S>                                                             <C>                      <C>                     <C>
Discount rate                                                       7.25                    7.50                    7.10
Rate of salary progression                                          4.75                    5.00                    5.00
Long-term rate of return on assets                                  9.50                    9.50                    9.50 
</TABLE>

Lyondell, Equistar and LCR also maintain voluntary defined contribution savings
plans for eligible employees.  Under provisions of the plans, Lyondell, Equistar
and LCR contribute an amount equal to 160 percent of employee contributions up
to a maximum matching contribution of eight percent of the employee's base
salary.  Prior to July 1, 1995, Lyondell and LCR had similar voluntary defined
contribution plans.  Lyondell contributions to all voluntary defined
contribution savings plans totaled $5 million during the year ended December 31,
1997.  Lyondell and LCR contributions to all voluntary defined contribution
savings plans totaled $10 million and $9 million during the years ended December
31, 1996 and 1995, respectively.


18.  POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

Lyondell, Equistar and LCR sponsor unfunded postretirement benefit plans other
than pensions ("OPEB") for both salaried and non-salaried employees which
provide medical and life insurance benefits.  The postretirement health care
plans are contributory while the life insurance plans are non-contributory.
Currently, Lyondell, Equistar and LCR pay approximately 80 percent of the cost
of the health care plans, but reserve the right to modify the cost-sharing
provisions at any time.  During 1997, in connection with the formation of
Equistar, an accrued 

                                       58
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


postretirement benefit liability of $12 million, associated with Lyondell
employees transferred to Equistar, was contributed by Lyondell to Equistar.

The following table sets forth the plans' separate postretirement benefit
liabilities at December 31, 1997 and 1996.
<TABLE>
<CAPTION>
 
                                                               1997                                    1996
                                                 --------------------------------       ------------------------------
MILLIONS OF DOLLARS                                 MEDICAL               LIFE             MEDICAL             LIFE 
- -------------------                              ------------           ---------       ------------         --------- 
<S>                                              <C>                     <C>              <C>                <C> 
Accumulated postretirement benefit obligation:                                                                      
    Retirees                                          $  (3)             $  (1)               $ (7)            $ (7)
    Fully eligible active plan participants             - -                - -                  (7)              (2)
    Other active plan participants                      - -                - -                 (32)              (1)
                                                 ------------           ---------       ------------         ---------  
                                                         (3)                (1)                (46)             (10)
Unrecognized prior service cost                         (20)               - -                  (5)             - - 
Unrecognized net loss                                     4                 (1)                  1              - - 
                                                 ------------           ---------       ------------         ---------  
Accrued postretirement benefit liability              $ (19)             $  (2)               $(50)            $(10) 
                                                 ============           =========       ============         =========  
</TABLE>

Net periodic postretirement benefit costs for 1997 was less than $1 million and
in 1996 and 1995 included the following components.
<TABLE>
<CAPTION>
    
                                                                     1996                           1995             
                                                        ----------------------------     --------------------------- 
MILLIONS OF DOLLARS                                        MEDICAL           LIFE          MEDICAL           LIFE    
- ---------------------                                   -------------     ----------     ------------     ----------   
<S>                                                       <C>             <C>             <C>              <C> 
Service cost - benefits attributed to service             $  3              $  --           $   2           $  --
Interest cost on accumulated postretirement obligation       3                  1               2               1
                                                        -------------     ----------     ------------     ----------    
Net periodic postretirement benefit cost                  $  6              $   1           $   4           $   1
                                                        =============     ==========     ============     ==========    

</TABLE>

For measurement purposes, the assumed annual rate of increase in the per capita
cost of covered health care benefits as of December 31, 1997 was 7 percent for
1998-2001 and 5 percent thereafter.  The health care cost trend rate assumption
does not have a significant effect on the amounts reported.  To illustrate,
increasing the assumed health care cost trend rates by one percentage point in
each year would increase the accumulated postretirement benefit liability as of
December 31, 1997 and the net periodic postretirement benefit cost for the year
then ended by less than $1 million each.

The accumulated postretirement benefit obligation was calculated utilizing a
weighted-average discount rate of 7.25 percent and 7.5 percent at December 31,
1997 and 1996, respectively, and an average rate of salary progression of 4.75
percent and 5.0 percent in 1997 and 1996, respectively.  Lyondell, Equistar and
LCR's current policy is to fund the postretirement health care and life
insurance plans on a pay-as-you-go basis.


19.  INCOME TAXES

Significant components of the Company's provision for income taxes follow.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS                                                   1997             1996             1995
- ---------------------                                              ----------       ----------       ----------
<S>                                                                <C>               <C>              <C> 
Current
  Federal                                                           $  114            $  19            $  206
  State                                                                 13                1                20
                                                                   ----------       ----------       ----------
     Total current                                                     127               20               226
                                                                   ----------       ----------       ----------
Deferred
  Federal                                                               43               48                 4
  State                                                                 --                2                (1)
                                                                   ----------       ----------       ----------
     Total deferred                                                     43               50                 3
                                                                   ----------       ----------       ----------
                                                                    $  170            $  70            $  229
                                                                   ==========       ==========       ==========

</TABLE>

                                       59
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax liabilities and assets as of December 31, 1997 and
1996 were as follows.
<TABLE>
<CAPTION>
 
MILLIONS OF DOLLARS                                                            1997                    1996    
- -------------------                                                         ----------             ---------- 
<S>                                                                           <C>                      <C>     
Deferred tax liabilities:                                                                                      
    Investments in partnerships                                               $ 230                    $ - -     
    Tax over book depreciation                                                  - -                      190   
    Deferred turnaround costs                                                   - -                       11   
    Business interruption recovery                                              - -                       11   
    LIFO inventory                                                              - -                        4   
    Other                                                                       - -                      - -   
                                                                            ----------             ----------  
        Total deferred tax liabilities                                          230                      216   
                                                                            ----------             ----------  
Deferred tax assets:                                                                                           
    Pension and other compensation related obligations                           16                       23   
    OPEB obligation                                                               4                       18   
    Environmental reserve                                                         5                        6   
    Other                                                                         2                        9   
                                                                            ----------             ----------  
        Total deferred tax assets                                                27                       56   
                                                                            ----------             ----------  
Net deferred tax liabilities                                                    203                      160   
Less current portion of deferred tax liability (asset)                           (6)                       3   
                                                                            ----------             ----------  
Long-term deferred income taxes                                               $ 209                    $ 157    
                                                                            ==========             ==========  
</TABLE>

The reconciliation of income tax computed at the U.S. federal statutory tax
rates to the Company's effective tax rates follows.
<TABLE>
<CAPTION>
 
                                                       1997                   1996                    1995 
DESCRIPTION                                              %                      %                       %  
- -----------                                          -------                --------               -------- 
<S>                                                    <C>                    <C>                     <C>  
U.S. statutory income tax rates                        35.0                   35.0                    35.0 
State income taxes, net of federal                      1.8                    1.2                     2.0 
Company owned life insurance                            (.1)                   (.1)                    - - 
Officer compensation                                     .9                    - -                     - - 
Other, net                                              (.3)                   (.4)                     .1 
                                                     -------                --------               --------  
    Effective income tax rate                          37.3                   35.7                    37.1  
                                                     =======                ========               ========  
</TABLE>

20.  COMMITMENTS AND CONTINGENCIES

The Company was party to various unconditional purchase obligation contracts as
a purchaser for product and services until the formation of Equistar on December
1, 1997.  The Company's total purchases under these agreements, including LCR
for 1996 and 1995, were $27 million, $47 million and $21 million in 1997, 1996
and 1995, respectively.

Operating lease net rental expenses for 1997, 1996 and 1995, including LCR for
1996 and 1995, were $43 million, $66 million and $60 million, respectively.

Depending on market conditions, breach or termination of LCR's Crude Supply
Contract could adversely affect the Company.  Although the parties have
negotiated alternative arrangements in the event of certain force majeure
conditions, including governmental or other actions restricting or otherwise
limiting PDVSA Oil's ability to perform its obligations, any such alternative
arrangements may not be as beneficial as the Crude Supply Contract.  There can
be no assurance that alternative crude oils with similar margins would be
available for purchase by LCR.  Furthermore, the breach or termination of the
Crude Supply Contract would require LCR to return to the practice of 

                                       60
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)



purchasing all of its crude oil feedstocks in the merchant market and would
again subject LCR to significant volatility and price fluctuations.

In connection with the transfer of assets and liabilities from ARCO to the
Company, the Company agreed to assume certain liabilities arising out of the
operation of the Company's integrated petrochemicals and petroleum processing
business prior to July 1, 1988.  In connection with the transfer of such
liabilities, the Company and ARCO entered into an agreement ("Cross-Indemnity
Agreement") whereby the Company agreed to defend and indemnify ARCO against
certain uninsured claims and liabilities which ARCO may incur relating to the
operation of the business of the Company prior to July 1, 1988, including
certain liabilities which may arise out of pending and future lawsuits.  ARCO
also indemnified the Company for all federal taxes which might be assessed upon
audit of the operations of the Company included in the consolidated financial
statements prior to January 12, 1989, and for all state and local taxes for the
period prior to July 1, 1988.

In 1997, the Company and ARCO updated the Cross-Indemnity Agreement ("Revised
Cross-Indemnity Agreement").  For current and future cases related to Company
products and Company operations, ARCO and the Company bear a proportionate share
of judgment and settlement costs according to a formula which allocates
responsibility based on years of ownership during the relevant time period.  The
party with the most significant potential liability exposure is responsible for
case management and associated costs while allowing the non-case managing party
to protect its interests.  Under the Revised Cross-Indemnity Agreement, the
Company will assume responsibility for its proportionate share of future costs
for waste site matters not covered by ARCO insurance.  Subject to the
uncertainty inherent in all litigation, management believes the resolution of
the matters pursuant to the Revised Cross-Indemnity Agreement will not have a
material adverse effect upon the consolidated financial statements or liquidity
of the Company.

Lyondell and Millennium have similar indemnifications with Equistar related to
the petrochemicals and polymers business contributions by the companies.
Equistar has agreed to indemnify and defend Lyondell and Millennium,
individually, against certain uninsured claims and liabilities which Equistar
may incur relating to the operation of the contributed business prior to
December 1, 1997 up to $7 million each within the first seven years of the
partnership, subject to certain terms of the Asset Contribution Agreements.

In addition to lawsuits for which the Company has indemnified ARCO, the Company
is also subject to various lawsuits and proceedings.  Subject to the uncertainty
inherent in all litigation, management believes the resolution of these
proceedings will not have a material adverse effect upon the consolidated
financial statements or liquidity of the Company.

The Company's policy is to be in compliance with all applicable environmental
laws. The Company is subject to extensive environmental laws and regulations
concerning emissions to the air, discharges to surface and subsurface waters and
the generation, handling, storage, transportation, treatment and disposal of
waste materials. Some of these laws and regulations are subject to varying and
conflicting interpretations. In addition, the Company cannot accurately predict
future developments, such as increasingly strict requirements of environmental
laws, inspection and enforcement policies and compliance costs therefrom which
might affect the handling, manufacture, use, emission or disposal of products,
other materials or hazardous and non-hazardous waste.

Subject to the terms of the Cross-Indemnity Agreement, the Company is currently
contributing funds to the cleanup of one waste site (Brio, located near Houston,
Texas) under the Comprehensive Environmental Response, Compensation and
Liability Act ("CERCLA") as amended and the Superfund Amendments and
Reauthorization Act of 1986. The Company is also subject to certain assessment
and remedial actions at the Refinery under the Resource Conservation and
Recovery Act ("RCRA").  In addition, the Company has negotiated an order with
the Texas Natural Resource Conservation Commission ("TNRCC") for assessment and
remediation of groundwater and soil contamination at the Refinery.

                                       61
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


During July 1994, the Company reported results of an independent investigation
conducted by the Audit Committee of the Board of Directors regarding the
compliance status of two process waste-water streams under the applicable
Benzene National Emissions Standard for Hazardous Air Pollutants ("NESHAPS")
regulations and certain issues raised by an employee.  Noncompliance with the
Benzene NESHAPS regulations and the related reporting requirements can result in
civil penalties and, under certain circumstances, substantial civil and,
potentially, criminal penalties.  The Company received a notice of violation
from the TNRCC regarding the two streams and paid a fine of $10,200.  In
addition, the Company incurred approximately $2 million in capital costs in
connection with these wastewater streams to achieve ongoing compliance with the
Benzene NESHAPS regulations.  Although the Criminal Enforcement Division of the
EPA is conducting a formal investigation, the Company does not believe any
aspects of the matters described above will subject the Company to criminal
liability or have a material adverse effect on the consolidated financial
statements or liquidity of the Company.

As of December 31, 1997 the Company has accrued $12 million related to future
CERCLA, RCRA and TNRCC assessment and remediation costs, of which $2 million is
included in current liabilities while the remaining amounts are expected to be
incurred over the next two to seven years.  In the opinion of management, there
is currently no material range of loss in excess of the amount recorded.
However, it is possible that new information about the sites for which the
reserve has been established, new technology or future developments such as
involvement in other CERCLA, RCRA, TNRCC or other comparable state law
investigations, could require the Company to reassess its potential exposure
related to environmental matters.

In the opinion of management, any liability arising from the matters discussed
in this Note is not expected to have a material adverse effect on the
consolidated financial statements or liquidity of the Company.  However, the
adverse resolution in any reporting period of one or more of these matters
discussed in this Note could have a material impact on the Company's results of
operations for that period without giving effect to contribution or
indemnification obligations of co-defendants or others, or to the effect of any
insurance coverage that may be available to offset the effects of any such
award.


21.  SEGMENT INFORMATION

The petrochemicals segment consists of Lyondell's operations in petrochemicals
including: olefins (including ethylene, propylene, butadiene, butylenes and
specialty products); aromatics (including benzene and toluene); methanol; methyl
tertiary butyl ether ("MTBE"); and refinery blending stocks.  Lyondell's
interest in Lyondell Methanol for 1997 and the petrochemicals business of
Equistar, including ethanol and ethyl ether, for December 1997 are included in
the petrochemicals segment. Production sites for the petrochemicals segment are
located at the Channelview Facility contributed by Lyondell to Equistar and
three of the eleven plant sites contributed by Millennium to Equistar.

The polymers segment consists of Lyondell's operations in polyolefins including
high-density polyethylene ("HDPE"), low-density polyethylene and polypropylene.
The polymers, concentrates and compounds, and wire and cable resins businesses
of Equistar for December 1997 are included in the polymers segment.

The refining segment, which is primarily composed of LCR operations, consists of
refined petroleum products including gasoline, low sulfur diesel and jet fuel;
aromatics produced at the Refinery, including benzene, toluene, paraxylene and
orthoxylene; lubricants, including industrial lubricants, motor oils, white
oils, process oils and base oils; carbon black sulfur; residual oil; petroleum
coke fuel; olefins feedstocks; and crude oil resales. Crude oil resales consist
of revenues from the resale of previously purchased crude oil and from
locational exchanges of crude oil that are settled on a cash basis.  Crude oil
exchanges and resales facilitate the operation of the Company's petroleum
processing business by allowing LCR to optimize the crude oil feedstock mix in
response to market conditions and refinery maintenance turnarounds and also to
reduce transportation costs.  Crude oil resales included in Lyondell's
consolidated results amounted to $436 million and $370 million for the years
ended December 31, 1996 and 1995, respectively.

                                       62
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)

Consolidated sales to CITGO, substantially all from LCR under the Products
Agreement, totaled $1.7 billion in 1996 and $1.4 billion in 1995.  No other
customer accounted for 10 percent or more of consolidated sales.

Summarized below is the segment data for the Company which includes restatements
in 1996 and 1995 to split the petrochemicals segment into the petrochemicals and
polymers segments and certain reclassifications for an intersegment pricing
adjustment recorded in 1996 retroactive to 1993.  Intersegment sales between the
petrochemicals and refining segments in 1996 and 1995 include olefins feedstocks
and benzene produced at the Refinery and gasoline blending stocks and hydrogen
produced at the Channelview Facility.  Intersegment sales from the
petrochemicals segment to the polymers segment include ethylene and propylene
produced at the Channelview Facility.  Intersegment sales were made at prices
based on current market values.
 
<TABLE>
<CAPTION>
                                                                                                                      
                              PETROCHEMICALS    POLYMERS    REFINING                                                  
MILLIONS OF DOLLARS              SEGMENT        SEGMENT     SEGMENT     UNALLOCATED     ELIMINATIONS     CONSOLIDATED 
- -------------------           --------------    --------    --------    -----------     ------------     ------------ 
1997
- ----
<S>                           <C>               <C>         <C>         <C>             <C>              <C>  
Sales and other
  operating revenues:
    Customers                         $2,108        $770                                                       $2,878
    Intersegment                         424         - -                                       $(424)             - -
                             ----------------  ----------                              --------------   -------------  
                                       2,532         770                                        (424)           2,878
Income from equity invest-
  ments before unusual                                                                                                
   charges                                28          13      $  102          $ (11)             - -              132 
Cost of sales                          2,062         612         - -            - -             (424)           2,250
Selling, general and
  administrative
  expenses                                26          76         - -             84              - -              186
 Unusual charges                         - -         - -         - -             40              - -               40
                             ----------------  ----------  ----------  -------------   --------------   -------------    
Operating income                      $  472        $ 95      $  102          $(135)    $        - -           $  534
                             ================  ==========  ==========  =============   ==============   =============   
Depreciation and
  amortization expense                $   50        $ 29         - -          $   5                            $   84
                             ================  ==========  ==========  =============                    =============   
Capital expenditures                  $   27        $ 13         - -          $   9                            $   49
                             ================  ==========  ==========  =============                    =============   
Identifiable assets                   $  447        $349      $  300          $ 463     $        - -           $1,559
                             ================  ==========  ==========  =============   ==============   =============    
 
1996
- ----
Sales and other
  operating revenues:
    Customers                         $1,628        $783      $2,641                                           $5,052
    Intersegment                         665         - -         171                           $(836)             - -
                             ----------------  ----------                              --------------   -------------  
 
                                       2,293         783       2,812                            (836)           5,052
Gain on sale of assets                    30         - -         - -                             - -               30
Cost of sales                          2,049         608       2,749                            (836)           4,570
Selling, general and
  administrative
  expenses                                34          78          62          $  60              - -              234
                             ----------------  ----------  ----------  -------------   --------------   -------------    
Operating income                      $  240        $ 97      $    1          $ (60)    $        - -           $  278
                             ================  ==========  ==========  =============   ==============   =============    
Depreciation and
  amortization expense                $   44        $ 29      $   34          $   3                            $  110
                             ================  ==========  ==========  =============                    =============    
Capital expenditures                  $   57        $ 20      $  529          $   3                            $  609
                             ================  ==========  ==========  =============                    =============    
Identifiable assets                   $  870        $624      $1,706          $ 137            $ (61)          $3,276
                             ================  ==========  ==========  =============   ==============   =============    
 
1995
- ----
Sales and other
  operating revenues:
    Customers                         $1,839        $627      $2,470                                           $4,936
    Intersegment                         504         - -         178                           $(682)             - -
                             ----------------  ----------  ----------                  --------------   -------------    
                                       2,343         627       2,648                            (682)           4,936
Cost of sales                          1,746         505       2,457                            (682)           4,026

</TABLE> 


                                       63
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)



<TABLE> 
<CAPTION> 
<S>                           <C>               <C>         <C>         <C>             <C>              <C>  
Selling, general and
  administrative
  expenses                                31          53          61          $  59              - -              204
                             ----------------  ----------  ----------  -------------   --------------   -------------    
Operating income                      $  566        $ 69      $  130          $ (59)    $        - -           $  706
                             ================  ==========  ==========  =============   ==============   =============     
 Depreciation and
  amortization expense                $   36        $ 18      $   30          $   2                            $   86
                             ================  ==========  ==========  =============                    =============     
Capital expenditures                  $   95        $376      $  505          $   6                            $  982
                             ================  ==========  ==========  =============                    =============     
Identifiable assets                   $  736        $605      $1,212          $  93            $ (40)          $2,606
                             ================  ==========  ==========  =============   ==============   =============     
</TABLE>

                                       64
 
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)

22. UNAUDITED QUARTERLY RESULTS

<TABLE> 
<CAPTION>
                                                                             FOR THE QUARTER ENDED
                                                      ------------------------------------------------------------------
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNTS             MARCH 31           JUNE 30        SEPTEMBER 30     DECEMBER 31
- --------------------------------------------          --------------     ------------     --------------   -------------
<S>                                                       <C>               <C>               <C>             <C>
1997
- ----
Sales and other operating revenues                        $  755            $  789            $  799          $  535
Operating income                                              85               167               182             100
Income before income taxes                                    63               146               162              85
Net income                                                    40                93               102              51
Earnings per share                                           .50              1.17              1.27             .64

1996
- ----
Sales and other operating revenues                        $1,165            $1,239            $1,247          $1,401
Operating income                                              61                45                71             101 
Income before income taxes                                    38                23                55              80
Net income                                                    24                15                35              52
Earnings per share                                           .30               .19               .43             .66
</TABLE> 

23. SUBSEQUENT EVENT

On March 20, 1998, Lyondell and Millennium announced an agreement to expand 
Equistar with the addition of the ethylene, propylene and ethylene oxide and 
derivatives businesses of Occidental Chemical Corporation, a subsidiary of 
Occidental Petroleum. The transaction, which is subject to regulatory approval, 
is expected to close by mid-year 1998. Lyondell's percentage ownership in 
Equistar would decrease to 41 percent from the current 57 percent ownership as a
result of this transaction.

                                      65
<PAGE>
 
                            EQUISTAR CHEMICALS, LP
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
                                        



To the Partnership Governance Committee
of Equistar Chemicals, LP:

We have audited the accompanying balance sheet of Equistar Chemicals, LP (the
"Partnership") as of December 31, 1997, and the related statements of income,
partners' capital, and cash flows for the period from December 1, 1997
(inception) to December 31, 1997.  These financial statements are the
responsibility of the Partnership's management.  Our responsibility is to
express an opinion on these financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Equistar Chemicals, LP as of
December 31, 1997, and the results of its operations and its cash flows for the
period from December 1, 1997 (inception) to December 31, 1997 in conformity with
generally accepted accounting principles.



Coopers & Lybrand L.L.P.                          Price Waterhouse LLP
Houston, Texas                                    Morristown, New Jersey
February 16, 1998                                 February 16, 1998

(Except as to the information                     (Except as to the information
presented in Note 18, for which                   presented in Note 18, for
the date is March 20, 1998)                       which the date is March 20, 
                                                  1998)


                                      66

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                              STATEMENT OF INCOME

              FOR THE PERIOD FROM DECEMBER 1, 1997 (INCEPTION) TO
                               DECEMBER 31, 1997
                                        


 
MILLIONS OF DOLLARS
- -------------------
 
SALES AND OTHER OPERATING REVENUES:
     Unrelated parties                                              $  338
     Related parties                                                    27
                                                                    ------
                                                                       365
  
OPERATING COSTS AND EXPENSES:
     Cost of sales:
       Unrelated parties                                               261
       Related parties                                                  26
     Selling, general and administrative expenses                       21
     Unusual charges                                                    42
                                                                    ------
                                                                       350
 
     Operating income                                                   15
 
Interest expense                                                       (10)
Interest income                                                          2
                                                                    ------
NET INCOME                                                          $    7
                                                                    ======
 


                      See notes to financial statements.

                                      67

<PAGE>
 
                            EQUISTAR CHEMICALS, LP

                                 BALANCE SHEET

                               DECEMBER 31, 1997
                                        
MILLIONS OF DOLLARS
- -------------------
 
ASSETS
Current assets:
  Cash and cash equivalents                                $    41
  Accounts receivable:
    Trade                                                      445
    Related parties                                             36
  Receivable from partners                                     150
  Inventories                                                  513
  Prepaid expenses and other current assets                     24
                                                           -------
    Total current assets                                     1,209
                                                           -------
 
Property, plant and equipment                                3,678
Less accumulated depreciation and amortization              (1,560)
                                                           --------
                                                             2,118
 
Goodwill, net                                                1,139
Deferred charges and other assets                              151
                                                           -------
Total assets                                               $ 4,617
                                                           =======
 
LIABILITIES AND PARTNERS' CAPITAL
Current liabilities:
  Accounts payable:
    Trade                                                  $   171
    Related parties                                             18
  Payable to partners                                           63
  Other accrued liabilities                                     65
  Current maturities of long-term debt                          36
                                                           -------
    Total current liabilities                                  353
                                                           -------
Long-term debt                                               1,512
Other liabilities and deferred credits                          34
 
Commitments and contingencies
 
Partners' capital:
  Partners' capital                                          3,063
  Note receivable from Lyondell LP                            (345)
                                                           -------
    Total partners' capital                                  2,718
                                                           -------
Total liabilities and partners' capital                    $ 4,617
                                                           =======


                      See notes to financial statements.

                                      68

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                        STATEMENT OF PARTNERS' CAPITAL

              FOR THE PERIOD FROM DECEMBER 1, 1997 (INCEPTION) TO
                               DECEMBER 31, 1997


<TABLE>
<CAPTION>
MILLIONS OF DOLLARS                                          LYONDELL               MILLENNIUM            TOTAL
- -------------------                                          --------               ----------            -----
<S>                                                         <C>                    <C>                   <C> 
Balance at December 1, 1997 (inception)                      $    - -               $      - -            $ - -
 
Capital contributions at inception:
    Net assets, at historical cost                                763                    2,048             2,811
    Note receivable from Lyondell LP                              345                      - -               345
 
Net income                                                          4                        3                 7
 
Distributions to partners                                         (57)                     (43)             (100)
 
                                                             --------               ----------            ------ 
Balance at December 31, 1997                                 $  1,055               $    2,008            $3,063
                                                             ========               ==========            ======
</TABLE>


                      See notes to financial statements.

                                      69

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                            STATEMENT OF CASH FLOWS

              FOR THE PERIOD FROM DECEMBER 1, 1997 (INCEPTION) TO
                               DECEMBER 31, 1997


 
MILLIONS OF DOLLARS
- -------------------
 
CASH FLOWS FROM OPERATING ACTIVITIES:
     Net income                                                    $   7
     Adjustments to reconcile net income to net
       cash provided by operating activities:
          Depreciation and amortization                               19
          Increase in accounts receivable                           (100)
          Increase in receivable from partners                      (101)
          Increase in inventories                                     (5)
          Increase in accounts payable                               188
          Increase in payable to partners                             54
          Increase in other accrued liabilities                       48
          Net change in other working capital accounts               (15)
          Other                                                        7
                                                                   -----
               Net cash provided by operating activities             102
                                                                   -----
 
CASH FLOWS FROM INVESTING ACTIVITIES:
     Additions to property, plant and equipment                      (12)
                                                                   -----
               Net cash used in investing activities                 (12)
                                                                   -----
 
CASH FLOWS FROM FINANCING ACTIVITIES:
     Borrowings of long-term debt                                     50
     Cash contributions from partners                                  1
     Distributions to partners                                      (100)
                                                                   -----
               Net cash used in financing activities                 (49)
                                                                   -----
 
INCREASE IN CASH AND CASH EQUIVALENTS                                 41
Cash and cash equivalents at beginning of period                     - -
                                                                   -----
Cash and cash equivalents at end of period                         $  41
                                                                   =====



                      See notes to financial statements.

                                      70

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                         NOTES TO FINANCIAL STATEMENTS


1.  FORMATION OF THE COMPANY AND OPERATIONS

Pursuant to a partnership agreement (the "Partnership Agreement") Lyondell
Petrochemical Company ("Lyondell") and Millennium Chemicals, Inc. ("Millennium")
formed Equistar Chemicals, LP ("Equistar" or the "Partnership"), a Delaware
limited partnership, which commenced operations on December 1, 1997 (See note 11
for related discussion).  The Partnership is owned 57 percent by Lyondell and 43
percent by Millennium.  Lyondell owns its interest in the Partnership through
two wholly-owned subsidiaries, Lyondell Petrochemical G.P. Inc. ("Lyondell GP")
and Lyondell Petrochemical L.P. Inc. ("Lyondell LP").  Millennium also owns its
interest in the Partnership through two wholly-owned subsidiaries, Millennium
Petrochemicals GP LLC ("Millennium GP") and Millennium Petrochemicals LP LLC
("Millennium LP").

The Partnership owns and operates the petrochemicals and polymers businesses
contributed by Lyondell and Millennium (the "Contributed Businesses") which
consist of 15 manufacturing facilities on the US Gulf Coast and in the US
Midwest.  The petrochemicals segment produces products including ethylene,
propylene, ethyl alcohol, butadiene, aromatics and methyl tertiary butyl ether
("MTBE").  These products are used primarily in the production of other
chemicals and products, including polymers.  The petrochemicals segment also
includes sales of methanol produced by Lyondell Methanol LP ("Lyondell
Methanol"), which is owned 75 percent by Lyondell.  The Partnership operates the
Lyondell Methanol facility.  The polymers segment produces products that include
polyethylene (high-density, low-density and linear low-density) and
polypropylene, which are used in the production of a wide variety of consumer
and industrial products.

The Partnership Agreement provides that Equistar is governed by a Partnership
Governance Committee consisting of six representatives, three appointed by each
partner. Most of the significant decisions of the Partnership Governance
Committee require unanimous consent, including approval of the Partnership's
Strategic Plan and annual updates thereof.

Pursuant to the Partnership Agreement, net income is allocated among the
partners on a pro rata basis based on their percentage ownership of the
Partnership.  Distributions are made to the partners based on their percentage
ownership of the Partnership.  Additional contributions required by the
Partnership will also be based on the partners' percentage ownership of the
Partnership.


2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Revenue Recognition - Revenue from product sales is generally recognized upon
shipment of products to the customer.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid debt
instruments such as certificates of deposit, commercial paper and money market
accounts purchased with an original maturity date of three months or less.  Cash
equivalents are stated at cost, which approximates fair value.  The
Partnership's policy is to invest cash in conservative, highly rated instruments
and limit the amount of credit exposure to any one institution.  The Partnership
performs periodic evaluations of the relative credit standing of these financial
institutions which are considered in the Partnership's investment strategy.

The Partnership has no requirements for compensating balances in a specific
amount at a specific point in time.  The Partnership does maintain compensating
balances for some of its banking services and products.  Such balances are
maintained on an average basis and are solely at the Partnership's discretion.
As a result, none of the Partnership's cash is restricted.

                                      71

<PAGE>
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


Management determines the appropriate classification of investments in debt
securities as trading, available-for-sale or held-to-maturity at the time of
purchase and reevaluates such designation as of each balance sheet date.

Accounts Receivable - The Partnership sells its products primarily to companies
in the petrochemicals and polymers industries.  The Partnership performs ongoing
credit evaluations of its customers' financial condition and in certain
circumstances requires letters of credit from them.

Inventories - Inventories are stated at the lower of cost or market.  Cost is
determined on the last-in, first-out ("LIFO") basis except for materials and
supplies, which are valued at average cost.

Property, Plant and Equipment - Property, plant and equipment are recorded at
cost.  Depreciation of property, plant and equipment is computed using the
straight-line method over the estimated useful lives of the related assets,
generally 5 to 25 years.
 
Upon retirement or sale, the Partnership removes the cost of the assets and the
related accumulated depreciation from the accounts and reflects any resulting
gains or losses in income.  The Partnership's policy is to capitalize interest
cost incurred on debt during the construction of major projects exceeding one
year.

Turnaround Maintenance and Repair Expenses - Cost of major repairs and
maintenance incurred in connection with turnarounds of units at the
Partnership's manufacturing facilities are deferred and amortized on a straight-
line basis until the next planned turnaround, generally four to six years.

Goodwill - Goodwill, which was contributed by Millennium, is being amortized
using the straight-line method over forty years.  Management periodically
evaluates goodwill for impairment based on the anticipated future cash flows
attributable to the related operations.  Such expected cash flows, on an
undiscounted basis, are compared to the carrying value of the tangible and
intangible assets, and if impairment is indicated, the carrying value of
goodwill, and if necessary other related assets, is adjusted.  Management
believes that no impairment exists at December 31, 1997.  The Partnership
amortized $3 million of goodwill during the period from December 1, 1997
(inception) to December 31, 1997.

Environmental Remediation Costs - Expenditures related to investigation and
remediation of contaminated sites, which include operating facilities and waste
disposal sites, are accrued when it is probable a liability has been incurred
and the amount of the liability can reasonably be estimated.  Estimates have not
been discounted to present value.  Environmental remediation costs are expensed
or capitalized in accordance with generally accepted accounting principles.

In October 1996 the American Institute of Certified Public Accountants issued
Statement of Position 96-1 ("SOP 96-1"), "Environmental Remediation
Liabilities," which establishes new accounting and reporting standards for the
recognition and disclosure of environmental remediation liabilities.  The effect
of adoption of SOP 96-1 in 1997 did not have a material impact on the
Partnership's financial position or results of operations.

Exchanges - Finished product exchange transactions, which are of a homogeneous
nature of commodities in the same line of business and do not involve the
payment or receipt of cash, are not accounted for as purchases and sales.  Any
resulting volumetric exchange balances are accounted for as inventory in
accordance with the normal LIFO valuation policy.  Exchanges settled through
payment and receipt of cash are accounted for as purchases and sales.

Income Taxes - The Partnership is not subject to federal income taxes as income
is reportable directly by the individual partners; therefore, there is no
provision for income taxes in the accompanying financial statements.

                                      72

<PAGE>
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


Use of Estimates - The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amount of revenues and expenses during the reporting
period.  Actual results could differ from those estimates.

3.  FINANCIAL INSTRUMENTS

The fair value of all financial instruments included in current assets and
current liabilities, including cash and cash equivalents, accounts receivable,
accounts payable and notes payable, approximated their carrying value due to
their short maturity. Based on the borrowing rates currently available to the
Partnership for debt with terms and average maturities similar to the
Partnership's debt portfolio, the fair value of the Partnership's long-term
debt, including amounts due within one year, was $1.506 billion at December 31,
1997.

At December 31, 1997, the Partnership had issued letters of credit totaling $4
million.

4.   RELATED PARTY TRANSACTIONS

Lyondell provides certain corporate, general and administrative services to the
Partnership, including legal, tax, treasury, risk management and other services
pursuant to a shared services agreement. The Partnership provides certain
general and administrative services to Lyondell, including computer, office
lease and employee benefits services.  During the period from December 1, 1997
(inception) to December 31, 1997, billings for these services were less than $1
million.

The Partnership also provides certain general and administrative services to
Millennium, including materials management, certain utilities, office space,
health, safety and environmental services and computer services. Millennium
provides the Partnership with certain operational services, including waste
water treatment and barge dock access.  During the period from December 1, 1997
(inception) to December 31, 1997, billings for these services were less than $1
million.

The Partnership has several feedstock and product sales agreements with
Lyondell-CITGO Refining Company Ltd. ("LCR"), a joint venture investment of
Lyondell.  Sales to LCR were $27 million and cost of sales to LCR were $26
million for the period from December 1, 1997 (inception) to December 31, 1997.

The Partnership has a feedstock, product sales and other services agreement with
Lyondell Methanol.  Lyondell Methanol sells all of its products to Equistar.
Purchases from Lyondell Methanol were $15 million for the period from December
1, 1997 (inception) to December 31, 1997.  Lyondell Methanol purchased $4
million of natural gas feedstock from the Partnership during the period from
December 1, 1997 (inception) to December 31, 1997.  Lyondell Methanol also pays
a business management fee to Equistar which was less than $1 million during the
period from December 1, 1997 (inception) to December 31, 1997.

                                      73

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


5.  INVENTORIES

The categories of inventory and their book values at December 31, 1997 were as
follows:

         MILLIONS OF DOLLARS
         -------------------
         Petrochemicals                           $ 183
         Polymers                                   264
         Materials and supplies                      66
                                                  -----
           Total inventories                      $ 513
                                                  =====

For  the period from December 1, 1997 (inception) to December 31, 1997, the
Partnership increased cost of sales by approximately $1 million associated with
the reduction in LIFO inventories.  The excess of the current cost of
inventories over book value was approximately $103 million at December 31, 1997.

6.  PROPERTY, PLANT AND EQUIPMENT

The components of property, plant and equipment and their gross value at
December 31, 1997 were as follows:

         MILLIONS OF DOLLARS
         -------------------
         Manufacturing facilities and equipment    $ 3,477
         Construction projects in progress             127
         Land                                           74
                                                   -------
           Total property, plant and equipment     $ 3,678
                                                   =======
                                                                                
7.  DEFERRED CHARGES AND OTHER ASSETS

Deferred charges and other assets at December 31, 1997 were as follows:

         MILLIONS OF DOLLARS
         -------------------
         Deferred turnaround costs, net                  $  66
         Deferred software costs, net                       44
         Deferred pension asset                             23
         Other                                              18
                                                         -----
           Total deferred charges and other assets       $ 151
                                                         =====

8.  OTHER ACCRUED LIABILITIES

Other accrued liabilities at December 31, 1997 were as follows:

         MILLIONS OF DOLLARS
         -------------------
         Accrued severance and other costs
           related to formation of the Partnership       $  27
         Accrued interest                                   10
         Other                                              28
                                                         -----
           Total other accrued liabilities               $  65
                                                         =====

                                      74

<PAGE>
 
9.  LONG-TERM DEBT AND FINANCING ARRANGEMENTS

Long-term debt at December 31, 1997 was comprised of the following:

         MILLIONS OF DOLLARS
         -------------------
         10.00% Notes due in 1999                  $  150
         9.125% Notes due in 2002                     100
         5-year term credit facility                  800
         Medium-term notes (1998-2005)                194
         6.5% Notes due in 2006                       150
         7.55% Debentures due in 2026                 150
         Other                                          4
                                                   ------
                                                    1,548
         Less current portion                          36
                                                   ------
           Total long-term debt                    $1,512
                                                   ======

Aggregate maturities of long-term debt during the five years subsequent to
December 31, 1997 are as follows: 1998-$36 million; 1999-$150 million; 2000-$42
million; 2001-$90 million; 2002-$901 million.  All of the above debt is
guaranteed by the Partners.

The medium-term notes mature at various dates from 1998 to 2005 and have a
weighted average interest rate at December 31, 1997 of 9.83 percent.

The Partnership has a five-year, $1.25 billion credit facility ("Facility") with
a group of banks expiring November 2002.  Borrowings under the Facility bear
interest at either the Federal Funds rate plus  1/2 of 1 percent, LIBOR, which
was 5.7 percent at December 31, 1997, a fixed rate offered by one of the
sponsoring banks or rates that are based on a competitive auction feature
wherein the interest rate can be established by competitive bids submitted by
the sponsoring banks, depending on the type of borrowing made under the
Facility.  The Facility is available for working capital and general purposes as
needed and contains covenants relating to liens, sale and leaseback
transactions, debt incurrence, leverage and interest coverage ratios, sales of
assets and mergers and consolidations.  As of December 31, 1997, the Partnership
was in compliance with the covenants of the Facility.


10.  NOTE RECEIVABLE FROM LYONDELL LP

Upon formation of the Partnership, Lyondell LP also contributed capital to the
Partnership in the form of a $345 million promissory note (the "Lyondell Note").
The Lyondell Note bears interest at LIBOR plus a market spread.  The Lyondell
Note will be repaid to the Partnership at the earlier of 3 years from the date
the Partnership commenced operations or 30 days after a financing at LCR, a
joint venture investment of Lyondell, which results in the repayment of LCR's
existing $450 million 5-year term loan and a distribution to Lyondell of at
least $345 million. During the period from December 1, 1997 (inception) to
December 31, 1997, the Partnership accrued $1.75 million of interest income
related to the Lyondell Note.


11. UNUSUAL CHARGES

In December 1997, the Partnership recorded $42 million of unusual charges
related to the formation of the Partnership.  These charges included severance
and other costs related to a workforce reduction (approximately 430 employees)
that resulted from the consolidation of the businesses contributed to the
Partnership ($30 million), various closing costs ($6 million), and various other
charges ($6 million).  Approximately $15 million of these charges were paid in
1997 and $27 million are included in other accrued liabilities in the
accompanying balance sheet and will be paid during 1998.

                                      75

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


12.  SUPPLEMENTAL CASH FLOW INFORMATION

The historical cost of the net assets contributed to the Partnership at
inception are summarized as follows (in millions of dollars):

                                                           AMOUNT
                                                           ------
              Total current assets                         $  948
              Property, plant and equipment, net            2,121
              Goodwill, net                                 1,142
              Deferred charges and other assets               158
                                                           ------
              Total assets                                 $4,369
                                                           ======
                                                    
              Current maturities of long-term debt         $   36
              Other current liabilities                        17
              Long-term debt                                1,462
              Other liabilities and deferred credits           43
              Partners' capital                             3,156
              Note receivable from Lyondell LP               (345)
                                                           ------
              Total liabilities and partners' capital      $4,369
                                                           ======

13.  LEASES

At December 31, 1997, future minimum rental payments for operating leases with
noncancelable lease terms in excess of one year were as follows:


              MILLIONS OF DOLLARS                          AMOUNT
              -------------------                          ------
              1998                                         $  128
              1999                                            111
              2000                                             80
              2001                                             56
              2002                                             42
              Thereafter                                      369
                                                           ------
                  Total minimum lease payments             $  786
                                                           ======

Operating lease net rental expense was $11 million for the period from December
1, 1997 (inception) to December 31, 1997.

The Partnership is party to various unconditional purchase obligation contracts
as a purchaser for product and services.  At  December 31, 1997, future minimum
payments under these contracts with noncancelable contract terms in excess of
one year were as follows:

              MILLIONS OF DOLLARS                          AMOUNT
              -------------------                          ------
              1998                                         $   30
              1999                                             29
              2000                                             29
              2001                                             26
              2002                                             26
              Thereafter                                      189
                                                           ------
              Total minimum contract payments              $  329
                                                           ======

                                      76

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


The Partnership's total purchases under these agreements were $3 million during
the period from December 1, 1997 (inception) to December 31, 1997.

14.  RETIREMENT PLANS

All full-time regular employees of the Partnership are covered by defined
benefit pension plans sponsored by the Partnership.  The plans became effective
on January 1, 1998, except for union represented employees, whose plans were
contributed to the Partnership at formation.  In connection with the formation
of the Partnership, there were no pension assets or obligations contributed to
the Partnership, except for the union represented plans.  Retirement benefits
are based on years of service and the employee's highest three consecutive years
of compensation during the last ten years of service.  The funding policy for
these plans is to make periodic contributions as required by applicable law.
The Partnership accrues pension costs based on an actuarial valuation and funds
the plans through contributions to pension trust funds. The Partnership also has
unfunded supplemental nonqualified retirement plans which provide pension
benefits for certain employees in excess of the tax qualified plans' limits.

The following table sets forth the funded status of the union represented plans
at December 31, 1997 (the other plans are unfunded as of December 31, 1997):

 
                                                             PLANS WITH
                                                              ASSETS IN
                                                              EXCESS OF
                                                                 ABO
                                                             ----------
MILLIONS OF DOLLARS
- -------------------
Actuarial present value of benefit obligations:
    Vested benefit obligation                                   $  19
                                                                =====
    Accumulated benefit obligation ("ABO")                      $  20
                                                                =====
    Projected benefit obligation                                $  21
Plan assets at fair value, primarily stocks and bonds              40
Plan assets in excess of projected benefit obligation              19
Unrecognized net loss                                               4
                                                                -----
Net pension asset                                               $  23
                                                                =====

As the non-union plans became effective on January 1, 1998, the Partnership did
not recognize any net periodic pension cost during the period from December 1,
1997 (inception) to December 31, 1997.

The assumptions used at December 31, 1997 in determining the net pension
liability shown above were as follows:

                                                           PERCENT
                                                           -------
Discount rate                                                7.25
Rate of salary progression                                   4.75
Long-term rate of return on assets                           9.00

Effective January 1, 1998, the Partnership also maintains voluntary defined
contribution savings plans for eligible employees.  Under provisions of the
plans, the Partnership contributes an amount equal to 160 percent of employee
contributions up to a maximum matching contribution of eight percent of the
employee's base salary.

                                      77

<PAGE>
 
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


15.  POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

The Partnership sponsors unfunded postretirement benefit plans other than
pensions ("OPEB") for both salaried and non-salaried employees, which provide
medical and life insurance benefits.  The postretirement health care plans are
contributory while the life insurance plans are non-contributory.  Currently,
the Partnership pays approximately 80 percent of the cost of the health care
plans, but reserves the right to modify the cost-sharing provisions at any time.
In connection with the formation of the Partnership, the Partners contributed
$31 million of accrued postretirement benefit liabilities for employees that
transferred to the Partnership.

The following table sets forth the plans' separate postretirement benefit
liabilities at December 31, 1997:


MILLIONS OF DOLLARS                              MEDICAL       LIFE
- -------------------                              -------       ----
Accumulated postretirement benefit obligation:
    Retirees                                     $     -      $   -
    Fully eligible active plan participants          (11)        (3)
    Other active plan participants                   (25)       (11)
                                                 -------      ----- 
                                                     (36)       (14)
Unrecognized prior service cost                        -          -
Unrecognized net loss                                 14          5
                                                 -------      -----
Accrued postretirement benefit liability         $   (22)     $  (9)
                                                 =======      =====

The accrued postretirement benefit liabilities were calculated and contributed
as of December 31, 1997; therefore, there was no net periodic postretirement
benefit costs for the period from December 1, 1997 (inception) to December 31,
1997.

For measurement purposes, the assumed annual rate of increase in the per capita
cost of covered health care benefits as of December 31, 1997 was 7 percent for
1998-2001 and 5 percent thereafter.  The health care cost trend rate assumption
does not have a significant effect on the amounts reported.  To illustrate,
increasing the assumed health care cost trend rates by one percentage point in
each year would increase the accumulated postretirement benefit liability as of
December 31, 1997 by less than $1 million.

The accumulated postretirement benefit obligation was calculated utilizing a
weighted-average discount rate of 7.25 percent at December 31, 1997 and an
average rate of salary progression of 4.75 percent.  The Partnership's current
policy is to fund the postretirement health care and life insurance plans on a
pay-as-you-go basis.

16.  COMMITMENTS AND CONTINGENCIES

The Partnership has various purchase commitments for materials, supplies and
services incident to the ordinary conduct of business.  In the aggregate, such
commitments are not at prices in excess of current market.

The Partnership is also subject to various lawsuits and proceedings.  Subject to
the uncertainty inherent in all litigation, management believes the resolution
of these proceedings will not have a material adverse effect upon the financial
statements or liquidity of the Partnership.

Equistar has agreed to indemnify and defend Lyondell and Millennium,
individually, against certain uninsured claims and liabilities which Equistar
may incur relating to the operation of the Contributed Business prior to
December 1, 1997 up to $7 million each within the first seven years of the
partnership, subject to certain terms of the Asset Contribution Agreements.

                                      78

<PAGE>
 
                            EQUISTAR CHEMICALS, LP

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


The Partnership's policy is to be in compliance with all applicable
environmental laws. The Partnership is subject to extensive environmental laws
and regulations concerning emissions to the air, discharges to surface and
subsurface waters and the generation, handling, storage, transportation,
treatment and disposal of waste materials. Some of these laws and regulations
are subject to varying and conflicting interpretations.  In addition, the
Partnership cannot accurately predict future developments, such as increasingly
strict requirements of environmental laws, inspection and enforcement policies
and compliance costs therefrom which might affect the handling, manufacture,
use, emission or disposal of products, other materials or hazardous and non-
hazardous waste.

In the opinion of management, any liability arising from the matters discussed
in this Note is not expected to have a material adverse effect on the financial
statements or liquidity of the Partnership.  However, the adverse resolution in
any reporting period of one or more of these matters discussed in this Note
could have a material impact on the Partnership's results of operations for that
period without giving effect to contribution or indemnification obligations of
co-defendants or others, or to the effect of any insurance coverage that may be
available to offset the effects of any such award.

17.  SEGMENT INFORMATION

The petrochemicals segment consists of olefins, including ethylene, propylene,
butadiene, butylenes and specialty products; aromatics, including benzene and
toluene; and MTBE.  The polymers segment consists of polyolefins including
polypropylene, high-density polyethylene, low-density polyethylene and linear
low-density polyethylene.

Summarized below is the segment data for the Partnership.  Intersegment sales
between the petrochemicals and polymers segments were made at prices based on
current market values.

<TABLE>
<CAPTION>
                            PETROCHEMICALS          POLYMERS
MILLIONS OF DOLLARS             SEGMENT              SEGMENT            UNALLOCATED           ELIMINATIONS          CONSOLIDATED
- -------------------         --------------          --------            -----------           ------------          ------------
<S>                         <C>                   <C>                 <C>                   <C>                    <C>
Sales and other
operating revenues:
    Customers                       $  179            $  186                                                              $  365
    Intersegment                       105               - -                                        $ (105)                  - -
                                    ------            ------                 ------                 ------                ------ 
                                       284               186                                          (105)                  365
Cost of sales                          236               156                                          (105)                  287
Selling, general and
  administrative
  expenses                               1                 8                 $   12                    - -                    21
Unusual charges                        - -               - -                     42                    - -                    42
                                    ------            ------                 ------                 ------                ------ 
Operating income                    $   47            $   22                 $  (54)                   - -                $   15
                                    ======            ======                 ======                 ======                ======
Depreciation and
  amortization expense              $    7            $    7                 $    5                 $  - -                $   19
                                    ======            ======                 ======                 ======                ====== 
Capital expenditures                $    7             $   4                 $    1                    - -                $   12
                                    ======            ======                 ======                 ======                ======
Identifiable assets                 $1,679            $1,510                 $1,428                 $    -                $4,617
                                    ======            ======                 ======                 ======                ======
</TABLE>

18.  SUBSEQUENT EVENT

On March 20, 1998, Lyondell and Millennium announced an agreement to expand
Equistar with the addition of the ethylene, propylene, ethylene oxide and
derivatives businesses of Occidental Chemical Corporation ("Occidental"), a
subsidiary of Occidental Petroleum Corporation. The transaction, which is
subject to regulatory approval, is expected to close by mid-year 1998. After the
close of the transaction, Lyondell will have 41 percent ownership interest of
the Partnership and Millennium and Occidental will each have 29.5 percent
ownership interests.

                                      79

<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.


LYONDELL-CITGO Refining Company Ltd. ("LCR") is a limited liability company
organized under the laws of the state of Texas.  LCR was formed in 1993 by
Lyondell Petrochemical Company ("Lyondell") and CITGO Petroleum Corporation
("CITGO"). LCR is owned by two members, Lyondell Refining Company and CITGO
Refining Investment Company, which are wholly owned subsidiaries of Lyondell and
CITGO, respectively.  CITGO is a subsidiary of Petroleos de Venezuela,
S.A.("PDVSA"), the national oil company of Venezuela.

The operative agreement with respect to the rights of each of the two members
and their parent companies is the Amended and Restated Limited Liability Company
Regulations ("Regulations") of LCR.  The Regulations govern, among other things,
ownership and cash distribution rights.  Under the terms of a reciprocal
Performance Guarantee and Control Agreement ("Performance Guarantee"), Lyondell
and CITGO each unconditionally guarantee the obligations and performance of
their respective wholly owned subsidiaries under the terms of the Regulations.

The Regulations provide that LCR is managed by an Owners Committee, which has
three representatives ("Representatives") from each member.  Actions requiring
unanimous consent of the Representatives, include, without limitation, amendment
of the Regulations, borrowing money in excess of LCR's existing credit
facilities, delegations of authority to committees, certain purchase commitments
and capital expenditures in excess of designated amounts and budgetary approval.
LCR's daily operations are managed by LCR's executive officers.

LCR owns a Refinery located on approximately 700 acres in Houston, Texas and a
lube oil blending and packaging plant in Birmingport, Alabama.  LCR also owns a
pipeline used to transport gasoline, kerosene and heating oil from the Refinery
to the GATX Terminal located in Pasadena, Texas to interconnect with common
carrier pipelines.

Units included in the Refinery are a fluid catalytic cracking unit, cokers,
reformers, crude distillation units, sulfur recovery plants and
hydrodesulfurization units as well as lube oil manufacturing and packaging
facilities and an aromatics recovery unit.  As a result of an upgrade project
completed in February 1997, the Refinery has a heavy crude oil processing
capability of approximately 250,000 barrels per day of 17 degree API gravity
crude oil.  LCR purchases substantially all of the heavy crude oil processed at
the Refinery from subsidiaries of PDVSA.

The Refinery produces gasoline, low sulfur diesel, jet fuel, aromatics,
lubricants and certain industrial products.  All of LCR's gasoline, low sulfur
diesel and jet fuel are sold to CITGO.  Aromatics such as benzene, toluene,
paraxylene and orthoxylene are used to manufacture a variety of intermediate
chemicals, including ethylbenzene, cumene, urethane foam components and
polyester intermediates for films, fibers and resins.  End uses of these
products include packaging and containers, furniture, apparel and flooring.


                                      80

<PAGE>
 

                     LYONDELL-CITGO REFINING COMPANY LTD.

                       REPORT OF INDEPENDENT ACCOUNTANTS



To the Owners Committee
of LYONDELL-CITGO Refining Company Ltd.

     We have audited the accompanying balance sheets of LYONDELL-CITGO Refining
Company Ltd. as of December 31, 1997 and 1996 and the related statements of
income, members' equity, and cash flows for each of the three years in the
period ended December 31, 1997.  These financial statements are the
responsibility of the Company's management.  Our responsibility is to express an
opinion on these financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of LYONDELL-CITGO Refining
Company Ltd. as of December 31, 1997 and 1996, and the results of its operations
and its cash flows for each of the three years in the period ended December 31,
1997 in conformity with generally accepted accounting principles.



Coopers & Lybrand L.L.P.
Houston, Texas
February 6, 1998


                                      81

<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                             STATEMENTS OF INCOME





                                                  FOR THE YEAR ENDED DECEMBER 31
                                                 -------------------------------
MILLIONS OF DOLLARS                                 1997       1996      1995
- -------------------                                 ----       ----      ---- 

SALES AND OTHER OPERATING REVENUES                 $2,697     $2,823    $2,646

OPERATING COSTS AND EXPENSES:
   Cost of sales:
        Crude oil and feedstock                     1,960      2,367     2,095
        Operating and other expenses                  482        386       367
   Selling, general and administrative expenses        72         59        58
                                                   ------     ------    ------ 
                                                    2,514      2,812     2,520
                                                   ------     ------    ------ 

   Operating income                                   183         11       126

Interest expense                                      (37)        (2)       (1)
Interest income                                         2          2         3
                                                   ------     ------    ------ 

Income before state income taxes                      148         11       128

Provision for state income taxes                        1      - - -         3
                                                   ------     ------    ------ 

NET INCOME                                         $  147     $   11    $  125
                                                   ======     ======    ====== 


                      See notes to financial statements.


                                      82


<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                                BALANCE SHEETS

                                                             DECEMBER 31
                                                         ------------------- 
MILLIONS OF DOLLARS                                      1997           1996
                                                         ----           ----

ASSETS
  Current assets:
    Cash and cash equivalents                           $   65         $   12
    Accounts receivable:
      Trade                                                 37            109
      Related parties and affiliates                        42             53
    Inventories                                             98             98
    Prepaid expenses and other current assets                1              1
                                                        ------         ------
      Total current assets                                 243            273
                                                        ------         ------

  Property, plant and equipment                          2,228          1,372
  Construction projects in progress                         52            832
  Accumulated depreciation and amortization               (889)          (826)
                                                        ------         ------
                                                         1,391          1,378
  Deferred charges and other assets                         47             56
                                                        ------         ------
 
      Total assets                                      $1,681         $1,707
                                                        ======         ======

LIABILITIES AND MEMBERS' EQUITY
  Current liabilities:
    Accounts payable:
      Trade                                             $   72         $  154 
      Related parties and affiliates                       125            152
    Distribution payable to LOwner                          36             24
    Distribution payable to COwner                          25          - - -
    Loan payable to bank                                 - - -             10
    Taxes, payroll and other liabilities                    35             33
                                                        ------         ------
      Total current liabilities                            293            373
                                                        ------         ------
  Commitments and contingencies
  Loan payable to bank                                     450            450
  Loans payable to LOwner                                  196            177
  Loans payable to COwner                                   17          - - -
  Pension, postretirement benefit and other liabilities     52             44
                                                        ------         ------
      Total long-term liabilities                          715            671
                                                        ------         ------

  Members' equity                                          673            663
                                                        ------         ------

      Total liabilities and members' equity             $1,681         $1,707
                                                        ======         ======

                      See notes to financial statements.


                                      83
<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                           STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                    FOR THE YEAR ENDED DECEMBER 31
                                                                              -----------------------------------------
MILLIONS OF DOLLARS                                                              1997           1996            1995
                                                                              ---------       ---------        --------
<S>                                                                           <C>              <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income                                                                    $   147          $   11         $   125
    Adjustments to reconcile net income to
       net cash provided by operating activities:
         Depreciation                                                                75              25              19
         Amortization                                                                16              10              13
         (Increase) decrease in accounts receivable - trade                          72              (1)            (38)
         (Increase) decrease in accounts receivable - related parties                 9             (20)             19
         Decrease in inventories                                                 - - -                9               3
         (Increase) decrease in prepaid expenses and other current assets            (1)              6          - - -
         Increase (decrease) in accounts payable - trade                            (89)             51              (8)
         Increase (decrease) in accounts payable - related parties                  (27)             43              42
         Increase (decrease) in taxes, payroll and other liabilities                  5              (4)             10
         Increase in deferred charges and other assets and change
              in pension, postretirement benefit and other liabilities                5             (28)             (3)
                                                                              ---------       ---------        --------
              Net cash provided by operating activities                             212             102             182
                                                                              ---------       ---------        --------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Additions to property, plant and equipment:
    Maintenance capital expenditures                                                (12)            (10)             (5)
    Environmental capital expenditures                                              (11)            (28)            (30)
    Capital enhancement expenditures                                                (17)            (18)            (11)
    Refinery upgrade expenditures                                                   (45)           (473)           (458)
    Capital expenditures to be reimbursed by Lyondell                            - - -           - - -               (2)
                                                                              ---------       ---------        --------
              Total capital expenditures                                            (85)           (529)           (506)
  Other                                                                              (1)             (1)              1
                                                                              ---------       ---------        --------
             Net cash used in investing activities                                  (86)           (530)           (505)
                                                                              ---------       ---------        --------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from (repayments of) bank loan                                           (10)             10             (20)
  Proceeds from bank loan for costs incurred on refinery upgrade                 - - -              199             251
  Proceeds from LOwner loans for costs incurred on refinery upgrade                  18             123              25
  Contributions from LOwner for working capital facility paydown                     65          - - -           - - -
  Proceeds from LOwner loans for costs to be incurred on capital projects             2              29          - - -
  Contributions from LOwner for costs to be incurred on capital projects              1               8          - - -
  Distributions to LOwner                                                          (147)            (84)           (146)
  Distributions to COwner                                                           (91)            (13)            (17)
  Reimbursements from Lyondell for capital expenditures                          - - -                4               2
  Reimbursements from COwner for costs incurred on refinery upgrade                   2             123             171
  Reimbursements from COwner for loan costs incurred on refinery upgrade              8              21               5
  Contributions from COwner for working capital facility paydown                     28          - - -           - - -
  Proceeds from COwner loans for costs incurred on refinery upgrade                  16          - - -           - - -
  Contributions from COwner for costs to be incurred on capital projects             35              13              17
                                                                              ---------       ---------        --------
             Net cash provided by (used in) financing activities                    (73)            433             288
                                                                              ---------       ---------        --------

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                     53               5             (35)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                     12               7              42
                                                                              ---------       ---------        --------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                                    $      65       $      12        $      7
                                                                              =========       =========        ========
</TABLE>

                      See notes to financial statements.

                                      84
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         STATEMENTS OF MEMBERS' EQUITY



MILLIONS OF DOLLARS              LOWNER       COWNER        TOTAL
                                 -------       ------       ------

BALANCE, DECEMBER 31, 1994        $  182       $  268       $  450

Cash contributions                     2          193          195
Other contributions               - - -             5            5
Distributions                       (164)         (22)        (186)
Net income                           110           15          125

                                 -------       ------       ------
BALANCE, DECEMBER 31, 1995           130          459          589

Cash contributions                     8          157          165
Other contributions               - - -             1            1
Distributions                        (91)         (12)        (103)
Net income                            10            1           11

                                 -------       ------       ------
BALANCE, DECEMBER 31, 1996            57          606          663

Cash contributions                    66           73          139
Other contributions               - - -        - - -        - - -
Distributions                       (158)        (118)        (276)
Net income                           103           44          147

                                 -------       ------       ------
BALANCE, DECEMBER 31, 1997       $    68       $  605       $  673
                                 =======       ======       ======


                      See notes to financial statements.


                                      85
<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


1. THE COMPANY

On July 1, 1993, Lyondell Petrochemical Company ("Lyondell") and CITGO Petroleum
Corporation ("CITGO") announced the commencement of operations of LYONDELL-CITGO
Refining Company Ltd. ("LCR" or the "Company"), a new entity formed and owned by
subsidiaries of Lyondell and CITGO in order to own and operate a refinery
("Refinery") located adjacent to the Houston Ship Channel in Houston, Texas and
a lube oil blending and packaging plant in Birmingport, Alabama.

Lyondell owns its interest in the Company through a wholly-owned subsidiary,
Lyondell Refining Company ("LOwner").  CITGO holds its interest through CITGO
Refining Investment Company ("COwner"), a wholly-owned subsidiary of CITGO.

The Company is organized and structured to afford its members the full
limitation of liability provided by the Texas Limited Liability Company Act
("Act").  The Act provides as to liability to third parties in the case of
companies such as LCR that its members, LOwner and COwner ("Members"), are not
liable for the debts, obligations or liabilities of the limited liability
company including under a judgment decree, or order of a court.  Unless
dissolved earlier under the terms of its Amended and Restated Limited Liability
Company Regulations ("Regulations"), LCR will continue to exist until December
31, 2017.

LOwner and COwner have agreed to allocate net income and cash provided by
operating activities based on certain contributions and other factors instead of
allocating such amounts based on their equity account balances.  Based upon
these contributions and other factors, LOwner and COwner had participation
interests of approximately 58 percent and 42 percent, respectively, as of
December 31, 1997.  COwner has a one-time option to make an additional equity
contribution sufficient to increase its participation interest in LCR to 50
percent.

At December 31, 1997, the Company employed approximately 1,300 full-time
employees.  Of these, approximately 800 were covered by collective bargaining
agreements between the Company and the Oil, Chemical and Atomic Workers Union.
The Company also uses the services of independent contractors in the routine
conduct of its business.

                                      86

<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Revenue Recognition - Revenue from product sales is generally recognized upon
delivery of products to the customer.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid debt
instruments such as certificates of deposit, commercial paper and money market
accounts purchased with an original maturity date of three months or less. Cash
equivalents are stated at cost, which approximates fair value.  The Company's
policy is to invest cash in conservative, highly rated instruments and limit the
amount of credit exposure to any one institution.  The Company performs periodic
evaluations of the relative credit standing of these financial institutions
which are considered in the Company's investment strategy.

Accounts Receivable - The Company sells its products primarily to companies in
the petrochemical and refining industries.  The Company performs ongoing credit
evaluations of its customers' financial condition and in certain circumstances
requires letters of credit from them.  The Company's allowance for doubtful
accounts receivable, which is reflected in the balance sheet as a reduction in
accounts receivable, was $179,000 and $220,000 at December 31, 1997 and 1996,
respectively.

Inventories - Inventories are stated at the lower of cost or market.  Cost is
determined on the last-in, first-out ("LIFO") basis except for materials and
supplies, which are valued at average cost.

Property, Plant and Equipment - Property, plant and equipment are recorded at
cost.  Depreciation of fixed assets is computed using the straight-line method
over the estimated useful lives of the related assets which range from five to
thirty years.  Upon retirement or sale, the Company removes the cost of the
assets and the related accumulated depreciation from the accounts and reflects
any resulting gains or losses in income. Interest costs incurred on debt during
the construction of major projects are capitalized.

Refinery Maintenance - Turnaround costs are repair and maintenance costs
incurred while performing an overhaul of a manufacturing unit.  Significant
turnaround costs are deferred and amortized on a straight-line basis over the
estimated period until the next planned turnaround, generally four to six years.
Other turnaround costs and ordinary repair and maintenance costs are expensed as
incurred.

Environmental Remediation Costs - Expenditures related to investigation and
remediation of contaminated sites, which include operating facilities and waste
disposal sites, are accrued when it is probable a liability has been incurred
and the amount of the liability can reasonably be estimated.  Estimates have not
been discounted to present value.  Environmental remediation costs are expensed
or capitalized in accordance with generally accepted accounting principles.

                                      87
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Exchanges - Crude oil and finished product exchange transactions, which are of a
homogeneous nature of commodities in the same line of business and do not
involve the payment or receipt of cash, are not accounted for as purchases and
sales.  Any resulting volumetric exchange balances are accounted for as
inventory in accordance with the normal LIFO valuation policy.  Exchanges
settled through payment and receipt of cash are accounted for as purchases and
sales.

Income Taxes - Deferred taxes result from temporary differences in the
recognition of revenues and expenses for tax and financial reporting purposes
and are calculated based upon cumulative book and tax differences in the balance
sheet in accordance with SFAS No. 109, "Accounting for Income Taxes."

Use of Estimates - The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period.  Actual results could differ from those estimates.

3.  RELATED PARTY TRANSACTIONS

On July 1, 1993, the Company entered into a long-term crude oil supply contract
("Crude Supply Contract") with Lagoven, S.A., now known as PDVSA Petroleo y Gas,
S.A. ("PDVSA Oil"), an affiliate of CITGO.  Pursuant to this contract, the
Company will purchase a substantial majority of its crude oil supply at market-
based prices adjusted for certain indexed items.  In addition, under the terms
of a long-term product sales agreement, CITGO purchases all of the refined
products produced at the Refinery also at market-based prices.  Both PDVSA Oil
and CITGO are subsidiaries of Petroleos de Venezuela, S.A.("PDVSA"), the
national oil company of Venezuela.

Also effective July 1, 1993, the Company and Lyondell entered into a number of
feedstock and product sales agreements; a tolling agreement, pursuant to which
alkylate and methyl tertiary butyl ether will be produced at Lyondell's
Channelview, Texas petrochemical complex for the Company; and various
administrative services agreements.

On December 1, 1997, Lyondell contributed its Channelview, Texas petrochemical
complex including its rights and obligations under the related party agreements
with LCR to a joint venture named Equistar Chemicals, LP ("Equistar").  Lyondell
has a 57 percent interest in Equistar.


                                      88
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


3.  RELATED PARTY TRANSACTIONS (CONTINUED)

Related party transactions are summarized as follows:

                                                   FOR THE YEAR ENDED
                                                       DECEMBER 31
                                           ---------------------------------
  MILLIONS OF DOLLARS                      1997          1996           1995
  -------------------                      ----          ----           ----
  Costs:
     Crude oil purchases                   $  977        $1,046        $  734
     Product purchases                        435           246           206
     Transportation fees                       13            27            22
                                           ------        ------        ------
                                           $1,425        $1,319        $  962
                                           ======        ======        ======
  Sales of crude oil and products          $1,987        $1,835        $1,707
                                           ======        ======        ======

The Company billed Lyondell (including in 1997, one month of Equistar
operations) approximately $5 million, $3 million and $11 million and Lyondell
and Equistar billed the Company approximately $7 million, $11 million and $16
million pursuant to various service and cost sharing arrangements during the
years ended December 31, 1997, 1996 and 1995, respectively. In addition, the
Company paid Lyondell (including in 1997, one month of Equistar operations)
approximately $40 million and $6 million during 1997 and 1996, respectively,
pursuant to a hydrogen supply agreement.

In September 1997 Atlantic Richfield Company ("ARCO") eliminated its ownership
interest in Lyondell by delivering its shares of Lyondell common stock to the
holders of certain ARCO notes.  For the nine months ended September 30, 1997,
the Company paid ARCO PipeLine Company, an affiliate of ARCO, approximately $4
million pursuant to throughput agreements. During 1996 and 1995 the Company paid
ARCO PipeLine Company approximately $5 million and $1 million, respectively,
pursuant to throughput agreements.

The Company recognized revenue from Lyondell of approximately $11 million in
1996 for a pricing adjustment retroactive to 1993.

During 1997 and 1996, the Company paid LOwner approximately $13 million and $4
million, respectively,  for interest on loans related to funding a portion of
the upgrade project at the Refinery and other capital expenditures.

In accordance with the terms of the Regulations, during 1997, 1996 and 1995 the
Company billed COwner approximately $7 million, $22 million and $6 million,
respectively, and COwner paid the Company approximately $8 million, $ 21 million
and $5 million, respectively, for financing costs incurred in connection with
the bank loan being used to partially fund the upgrade project at the Refinery.


                                      89
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


4.  SUPPLEMENTAL CASH FLOW INFORMATION

At December 31, 1997, 1996 and 1995, property, plant and equipment included
approximately $13 million, $9 million and $53 million, respectively, of non-cash
additions which related to accounts payable accruals.  Accounts receivable from
related parties and affiliates at December 31, 1995 included approximately $4
million of reimbursements due to the Company from Lyondell for additions to
fixed assets.

During 1997, 1996 and 1995, the Company paid approximately $42 million, $27
million and $7 million, respectively, for interest and approximately $1 million,
$4 million and $2 million, respectively, for state income and franchise taxes.
Of the interest paid during 1997, 1996 and 1995, approximately $9 million, $25
million and $6 million, respectively, was capitalized.

5.  FINANCIAL INSTRUMENTS

The fair value of all financial instruments included in current assets and
current liabilities, including cash and cash equivalents, accounts receivable,
accounts payable and notes payable, approximated their carrying value due to
their short maturity.  The fair value of long-term loans payable approximated
their carrying value because they are variable interest rate loans.

At December 31, 1997, the Company had issued letters of credit totaling
approximately $8 million.

The Company is party to take-or-pay contracts for hydrogen and electricity.  At
December 31, 1997, future minimum payments under these contracts with
noncancelable contract terms in excess of one year were as follows:

MILLIONS OF DOLLARS        AMOUNT
- -------------------        ------
     1998                  $  43
     1999                     43
     2000                     43
     2001                     44
     2002                     33
     Thereafter              474
                           -----
  Total minimum payments   $ 680
                           =====

The Company's total purchases under these agreements were approximately $90
million, $35 million and $8 million during 1997, 1996 and 1995, respectively.


                                      90
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


6.  INVENTORIES

The categories of inventory and their book values were as follows:

                                      DECEMBER 31
                                   ----------------- 
   MILLIONS OF DOLLARS             1997         1996
   -------------------             ----         ---- 
   Crude oil                       $ 47         $ 47
   Refined products                  35           35
   Materials and supplies            16           16
                                   ----         ----
                                   $ 98         $ 98
                                   ====         ====

There was no material impact to cost of sales in 1997 associated with a change
in LIFO inventories.  Cost of sales was reduced approximately $2 million and $3
million in 1996 and 1995 , respectively, associated with reductions in LIFO
inventories.  The excess of the current cost of inventories over book value was
approximately $73 million and $143 million at December 31, 1997 and 1996,
respectively.

7.  PROPERTY, PLANT AND EQUIPMENT

The primary components of property, plant and equipment were manufacturing
facilities and equipment.

Repair and maintenance expenses for the years ended December 31, 1997, 1996 and
1995 were approximately $75 million, $70 million, and $73 million, respectively.
The 1997, 1996 and 1995 amounts include amortization of deferred turnaround
costs of approximately $10 million, $5 million, and $11 million, respectively.

8.  FINANCING ARRANGEMENTS

In May 1995, LCR entered into two credit facilities totaling $520 million with a
group of banks.  The first facility, a $70 million, 364-day revolving working
capital facility, was renewed effective May 1997, and is being utilized for
general business purposes and for letters of credit.  At December 31, 1997, no
amounts were outstanding under this credit facility.  At December 31, 1996, $10
million was outstanding under this credit facility with a weighted average
interest rate of 7.1 percent. Interest for this credit facility is based on
either prime or eurodollar rates or based on a competitive auction feature
wherein the interest rate can be established by competitive bids submitted by
the participating banks, all at the Company's option. The second facility is a
$450 million, five-year term credit facility that was used to partially fund an
upgrade project at the Refinery which was completed in February 1997.  At both
December 31, 1997 and 1996, $450 million was outstanding under this credit
facility with a weighted average interest rate of 6.5 percent and 6.3 percent,
respectively.  Interest for this facility is based on prime or eurodollar rates
at the Company's option.  This second facility is due in May, 2000.  Both
facilities contain

                                      91
<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


8.  FINANCING ARRANGEMENTS (CONTINUED)

covenants which require LCR to maintain a minimum net worth which increases each
year until 1998 and maintenance of certain financial ratios defined in the
agreements.  The facilities also contain other customary covenants which limit
the Company's ability to modify certain significant contracts, incur additional
debt or liens, dispose of assets, make restricted payments as defined in the
agreements or merge or consolidate with other entities.

In October 1995, pursuant to the Regulations, the Company began borrowing money
from LOwner in connection with the upgrade project at the Refinery and other
capital expenditures.  These loans are due on July 1, 2003 and are subordinate
to the two bank credit facilities.  At December 31, 1997 and 1996, these
subordinated loans totaled approximately $196 million and $178 million,
respectively, and had a weighted average interest rate of 6.2 percent and 5.9
percent, respectively.  Interest on these loans is based on eurodollar rates and
is payable at the end of each calendar quarter.

In January 1997, pursuant to the Regulations, the Company began borrowing money
from COwner in connection with the upgrade project at the Refinery and other
capital expenditures.  These loans are due on July 1, 2003 and are subordinate
to the two bank facilities.  At December 31, 1997, these subordinated loans
totaled approximately $17 million and had a weighted average interest rate of
6.2 percent.

During 1997, 1996 and 1995, the Company incurred approximately $45 million, $30
million and $7 million of interest cost, respectively, and capitalized
approximately $9 million, $27 million and $6 million, respectively, of this
amount.

9.  LEASES

The Company leases crude oil storage facilities, a fleet of railroad tank cars,
computers, office equipment and other items.  At December 31, 1997, future
minimum rental payments for operating leases with noncancelable lease terms in
excess of one year were as follows:

     MILLIONS OF DOLLARS                 AMOUNT
     -------------------                 ------
            1998                          $ 15
            1999                            14
            2000                            11
            2001                             5
            2002                             9
            Thereafter                       7
                                          ----
     Total minimum lease payments         $ 61
                                          ====


                                      92
<PAGE>
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS



9.  LEASES (CONTINUED)

Operating lease net rental expenses for the years ended December 31, 1997, 1996
and 1995 were approximately $22 million, $22 million and $25 million,
respectively.

10. RETIREMENT PLANS

All full-time, regular employees are covered by defined benefit pension plans.
Retirement benefits are based on years of service and the employee's highest
three consecutive years of compensation during the last ten years of service.
The funding policy for these plans is to make periodic contributions as required
by applicable law.  The Company accrues pension costs based on an actuarial
valuation and funds the plans through contributions to a pension trust fund
separate from the Company's funds.

The Company also has an unfunded supplemental nonqualified retirement plan which
provides pension benefits for certain employees in excess of the tax qualified
plan's limits.

The following table sets forth the funded status of the Company's retirement
plans and the amounts recognized in the Company's balance sheet:

<TABLE>
<CAPTION>
                                                                         DECEMBER 31
                                                           --------------------------------------
                                                                     1997                 1996
                                                           ------------------------    ----------
                                                           Plans with    Plans with    Plans with
                                                           assets in       ABO in      assets in
                                                           excess of     excess of     excess of
MILLIONS OF DOLLARS                                           ABO         assets          ABO
- -----------------------                                    ----------    ----------    ----------
<S>                                                       <C>           <C>           <C>
Actuarial present value of benefit obligations:
  Vested benefit obligation                                  $ 6           $ 28          $   25
                                                             ===           ====          ======
  Accumulated benefit obligation ("ABO")                     $ 7           $ 31          $   29
                                                             ===           ====          ======
  Projected benefit obligation                               $11           $ 53          $   48
Plan assets at fair value, primarily stocks and bonds          7             29              30
                                                             ---           ----          ------
Projected benefit obligation in excess of plan assets         (4)           (24)            (18)
Unrecognized net loss                                          1              8               3
Prior service cost not yet recognized in pension cost         --              3               3
Remaining unrecognized net asset                              --             (1)             (1)
                                                             ---           ----          ------
Net pension liability                                        $(3)          $(14)         $  (13)
                                                             ===           ====          ======
</TABLE>


                                      93


<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS
                                        

10. RETIREMENT PLANS (CONTINUED)

The Company's net periodic pension cost included the following components:

                                                   FOR THE YEAR ENDED
                                                       DECEMBER 31
                                            --------------------------------
  MILLIONS OF DOLLARS                       1997          1996          1995
  -------------------                       ----          ----          ----
  Service cost - benefits earned
   during the period                        $  4          $  4          $  3
  Interest cost on projected
   benefit obligations                         5             4             3
  Actual (gain) loss on plan assets           (5)           (5)           (5)
  Net amortization and deferral                2             3             3
                                            ----          ----          ----
  Net periodic pension cost                 $  6          $  6          $  4
                                            ====          ====          ====
                                        
The assumptions used in determining the net periodic pension cost and net
pension liability were as follows:

                                                         DECEMBER 31
                                              -------------------------------
  PERCENT                                     1997         1996          1995
  -------                                     ----         ----          ----
  Discount rate                               7.25         7.50          7.10
  Rate of salary progression                  4.75         5.00          5.00
  Long-term rate of return on assets          9.50         9.50          9.50

The Company maintains voluntary defined contribution savings plans for its
eligible employees.  Under the current provisions of the plans, the Company
contributes an amount equal to 160 percent of employee contributions up to a
maximum Company contribution of eight percent of the employee's base salary. The
Company contributed approximately $5 million, $4 million and $4 million to these
plans during 1997, 1996 and 1995, respectively.

11.  POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

The Company sponsors unfunded postretirement benefit plans other than pensions
for both salaried and non-salaried employees which provide medical and life
insurance benefits.  The postretirement health care plan is contributory while
the life insurance plan is non-contributory.  Currently, the Company pays
approximately 80 percent of the cost of the health care plan, but reserves the
right to modify the cost-sharing provisions at any time.

                                      94
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


11. POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (CONTINUED)

The following table sets forth the plans' separate postretirement benefit
liabilities:

<TABLE>
<CAPTION>
                                                                           DECEMBER 31
                                                         ----------------------------------------------
                                                                 1997                      1996
                                                         ------------------         -------------------
MILLIONS OF DOLLARS                                      MEDICAL       LIFE         MEDICAL        LIFE
- -------------------                                      -------       ----         -------        ----
<S>                                                   <C>          <C>              <C>         <C>
Accumulated postretirement benefit obligation:
 Retirees                                                 $ (4)    $    ---          $ (3)       $  ---
 Fully eligible active plan participants                    (6)          (1)           (4)           (1)
 Other active plan participants                            (27)          (4)          (19)           (4)
                                                          ----          ---          ----           ---
                                                           (37)          (5)          (26)           (5)
Unrecognized prior service cost                             (2)          --            (3)           --
Unrecognized net loss                                        9           (1)            3            --
                                                          ----          ---          ----           ---
Accrued postretirement benefit liability                  $(30)         $(6)         $(26)          $(5)
                                                          ====          ===          ====           ===
</TABLE>
                                        
Net periodic postretirement benefit cost included the following component:

<TABLE>
<CAPTION>
                                                         FOR THE YEAR ENDED DECEMBER 31
                                    -----------------------------------------------------------------------
                                            1997                      1996                      1995
                                    ------------------         ------------------        ------------------
MILLIONS OF DOLLARS                 MEDICAL       LIFE         MEDICAL       LIFE        MEDICAL       LIFE
- -------------------                 -------       ----         -------       ----        -------       ----
<S>                               <C>           <C>            <C>         <C>         <C>           <C>
Service cost - benefits
 attributed to                      $ 1.6        $ 0.2         $  1.3      $  0.2         $ 0.8       $ 0.2
   service during the period
Interest cost on accumulated
 postretirement benefit               2.4          0.4            1.9         0.4           1.3         0.4
 obligation
Net amortization and deferral         0.1          --            (0.1)         --          (0.2)         --
                                    -----        -----          ------     ------         -----       -----
Net periodic postretirement
   benefit cost                     $ 4.1        $ 0.6          $  3.1     $  0.6         $ 1.9       $ 0.6
                                    =====        =====          ======     ======         =====       =====
</TABLE>
                                        
For measurement purposes, the assumed annual rate of increase in the per capita
cost of covered health care benefits as of December 31, 1997 was seven percent
through 2001 and five percent thereafter. The health care cost trend rate
assumption has a significant effect on the amounts reported.  To illustrate,
increasing the assumed health care cost trend rates by one percentage point in
each year would increase the accumulated postretirement benefit obligation as of
December 31, 1997 by approximately $8 million and the net periodic
postretirement benefit cost for the year then ended by approximately $1 million.

The accumulated postretirement benefit obligation was calculated utilizing a
weighted-average discount rate of 7.25 percent and 7.5 percent and an average
rate of salary progression of 4.75 percent and 5 percent at December 31, 1997
and 1996, respectively.  The Company's current policy is to fund the cost of
postretirement health care and life insurance plans on a pay-as-you-go basis.

                                      95
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


12. INCOME TAXES

The Company is treated as a partnership for federal income tax purposes;
consequently, no provision for federal income taxes is required.  However, the
Company is subject to state income taxes, and therefore a provision for state
income taxes has been recorded.

Significant temporary differences creating future federal taxable income or tax
deductions for the Members are as follows:

                                                                 DECEMBER 31
                                                              -----------------
MILLIONS OF DOLLARS                                           1997         1996
- -------------------                                           ----         ----
Temporary differences creating future taxable income:
     LIFO inventory                                          $   20      $   32
     Deferred turnaround costs                                   18          10
     Tax over book depreciation                                 199          66
                                                             ------      ------
       Total future taxable income                              237         108
                                                             ------      ------
Temporary differences creating future tax deductions:
     Postretirement benefits                                    (36)        (32)
     Amortization of organization costs                          (2)         (1)
     Pensions and other compensation liabilities                (23)        (17)
     Uniform capitalization                                      (8)         (5)
                                                             ------      ------
       Total future tax deductions                              (69)        (55)
                                                             ------      ------
 
  Net temporary differences                                  $  168      $   53
                                                             ======      ======

Pretax income was taxed by domestic jurisdictions only. The current provision
for state income tax was $1 million in 1997 and $3 million in 1995.  There was
no current provision for state income tax in 1996.  In addition, there was no
deferred provision for state income tax in 1997, 1996 and 1995.

13.  FRANCHISE TAXES

The capital-based portion of the Texas franchise tax during 1997, 1996 and 1995
of approximately  $1 million each year is included in selling, general and
administrative expenses.

14.  COMMITMENTS AND CONTINGENCIES

The Company is subject to various lawsuits and proceedings.

                                      96
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS



14.  COMMITMENTS AND CONTINGENCIES (CONTINUED)

With respect to liabilities associated with the Company, Lyondell generally has
retained liability for events that occurred prior to July 1, 1993 and certain
on-going environmental projects at the Refinery.  The Company generally is
responsible for liabilities associated with events occurring after June 30, 1993
and on-going environmental compliance inherent to the operation of the Refinery.

The Company's policy is to be in compliance with all applicable environmental
laws.  The Company is subject to extensive environmental laws and regulations
concerning emissions to the air, discharges to surface and subsurface waters and
the generation, handling, storage, transportation, treatment and disposal of
waste materials.  Some of these laws and regulations are subject to varying and
conflicting interpretations.  In addition, the Company cannot accurately predict
future developments, such as increasingly strict requirements of environmental
laws, inspection and enforcement policies and compliance costs therefrom, which
might affect the handling, manufacture, use, emission or disposal of products,
other materials or hazardous and non-hazardous waste.

The Company estimates that it has a liability of approximately $11 million at
December 31, 1997 related to future Comprehensive Environmental Response,
Compensation and Liability Act of 1980 ("CERCLA"), Resource Conservation and
Recovery Act ("RCRA"), and Texas Natural Resource Conservation Commission
("TNRCC") assessment and remediation costs.  Lyondell has a contractual
obligation to reimburse the Company for a portion of this liability which is
currently estimated to be approximately $10 million.  The Company has accrued a
current liability of approximately $1 million related to this liability for
which Lyondell does not have any obligation to reimburse the Company. In the
opinion of management, there is currently no material range of loss in excess of
the amount recorded.  However, it is possible that new information about the
sites associated with this liability, new technology or future developments such
as involvement in other CERCLA, RCRA, TNRCC or other comparable state law
investigations, could require the Company to reassess its potential exposure
related to environmental matters.

Depending on then current market conditions, breach or termination of the Crude
Supply Contract could adversely affect the Company.  Although the parties have
negotiated alternative arrangements in the event of certain force majeure
conditions, including governmental or other actions restricting or otherwise
limiting PDVSA Oil's ability to perform its obligations, any such alternative
arrangements may not be as beneficial as the Crude Supply Contract.  There can
be no assurance that alternative crude oils with similar margins would be
available for purchase by the Company.  Furthermore, the breach or termination
of the Crude Supply Contract may require the Company to return to the practice
of purchasing all of its crude oil feedstocks in the merchant market and may
subject the Company to significant volatility and price fluctuations.

                                      97
<PAGE>
 
 
                     LYONDELL-CITGO REFINING COMPANY LTD.
                          A LIMITED LIABILITY COMPANY
                         NOTES TO FINANCIAL STATEMENTS


14.  COMMITMENTS AND CONTINGENCIES (CONTINUED)

During the first quarter of 1997 the Company settled outstanding litigation for
approximately $3.5 million through voluntary mediation.

The Company has various purchase commitments for materials, supplies and
services incident to the ordinary conduct of business.  In the aggregate, such
commitments are not at prices in excess of current market.

In the opinion of management, any liability arising from the matters discussed
in this note will not have a material adverse effect on the financial statements
or liquidity of the Company.  However, the adverse resolution in any reporting
period of one or more of the matters discussed in this note could have a
material impact on the Company's results of operations for that period.

15.  SUBSEQUENT EVENTS

In January 1998, LCR announced a cost reduction plan which is expected to
eliminate approximately 100 jobs at LCR over the next twelve months.
Approximately 40 of the jobs eliminated would be replaced by positions created
at Lyondell and CITGO and billed to LCR under shared service arrangements.
Restructuring costs are currently estimated to be approximately $2 million.

                                      98

<PAGE>
 
ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
           FINANCIAL DISCLOSURE

           None, except as set forth in the Company's Current Report on Form 8-K
           filed pursuant to the Securities Exchange Act of 1934, as amended, on
           March 26, 1998.

                                    PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

ITEM 11.  EXECUTIVE COMPENSATION

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Information regarding executive officers of the Company is included in Part I.
For the other information called for by Items 10, 11, 12 and 13, reference is
made to the Registrant's definitive proxy statement for its Annual Meeting of
Stockholders, to be held on May 15, 1998, which will be filed with the
Securities and Exchange Commission within 120 days after December 31, 1997, and
which is incorporated herein by reference.

                                       99
<PAGE>
 
                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

  (a) The following documents are filed as a part of this report:

1 and 2  --  Consolidated Financial Statements:  these documents are listed in
             the Index to Financial Statements.

EXHIBITS
<TABLE> 
<CAPTION> 


<S>         <C> 
 
3.1     -   Amended and Restated Certificate of Incorporation of the Registrant (15)
3.2     -   Amended and Restated By-Laws of the Registrant (16)
4.1     -   Indenture, as supplemented by a First Supplemental Indenture, between the Registrant and Texas
            Commerce Bank National Association, as Trustee (2)
4.1(a)  -   Second Supplemental Indenture between the Registrant, Equistar and Texas Commerce Bank National
            Association
4.2     -   Indenture, as supplemented by a First Supplemental Indenture, between the Registrant and
            Continental Bank, National Association, as Trustee (4)
4.2(a)  -   Second Supplemental Indenture between the Registrant, Equistar and First Trust National Association
4.3     -   Indenture, as supplemented by a First Supplemental Indenture, between the Registrant and Texas
            Commerce Bank, as Trustee (12)
4.3(a)  -   Second Supplemental Indenture between the Registrant, Equistar and Texas Commerce Bank National
            Association
4.4     -   Specimen certificate (1)
4.5     -   LYONDELL-CITGO Refining Company Ltd. $70,000,000 Credit Agreement (8)
4.5(a)  -   Amendment No. 1 to the $70,000,000 Credit Agreement (13)
4.5(b)  -   Amendment No. 2 to the $70,000,000 Credit Agreement (14)
4.6     -   LYONDELL-CITGO Refining Company Ltd. $450,000,000 Credit Agreement (8)
4.6(a)  -   Amendment No. 1 to the $450,000,000 Credit Agreement (13)
4.6(b)  -   Amendment No. 2 to the $450,000,000 Credit Agreement (14)
4.7     -   Registrant's $225,000,000 Amended and Restated Credit Agreement
4.8     -   Rights Agreement between the Registrant and the Bank of New York, as Rights Agent (11)
</TABLE>

The Company is a party to several debt instruments under which the total amount
of securities authorized does not exceed 10% of the total assets of the Company
and its subsidiaries on a consolidated basis.  Pursuant to paragraph 4(iii)(A)
of Item 601(b) of Registration S-K, the Company agrees to furnish a copy of such
instruments to the Commission upon request.
 
<TABLE>
<CAPTION>
EXECUTIVE COMPENSATION:
<S>         <C> 
 
10.1    -   Amended and Restated Executive Supplementary Savings Plan (15)
10.2    -   Amended and Restated Executive Long-Term Incentive Plan (3)
10.3    -   Amended and Restated Supplementary Executive Retirement Plan
10.3(a) -   Amendment to the Amended and Restated Supplementary Executive Retirement Plan
10.4    -   Executive Medical Plan (15)
10.4(a) -   Amendment No. 1 to the Executive Medical Plan (15)
10.4(b) -   Amendment No. 2 to the Executive Medical Plan (15)
10.5    -   Amended and Restated Executive Deferral Plan
10.6    -   Executive Long-Term Disability Plan (4)
10.6(a) -   Amendment No. 1 to the Executive Long-Term Disability Plan (15)
10.7    -   Executive Life Insurance Plan (4)
10.8    -   Amended and Restated Supplemental Executive Benefit Plans Trust Agreement
10.8(a) -   Amendment to the Amended and Restated Supplemental Executive Benefit Plans Trust Agreement
10.9    -   Restricted Stock Plan (7)
10.9(a) -   Amendment No. 1 to the Restricted Stock Plan (10)
</TABLE> 


                                      100

<PAGE>
<TABLE> 
<CAPTION> 
<S>         <C> 
10.9(b) -   Amendment No. 2 to the Restricted Stock Plan
10.10   -   Form of Registrant's Indemnity Agreement with Officers and Directors (1)
10.11   -   Amended and Restated Elective Deferral Plan for Non-Employee Directors (15)
10.11(a)-   Amendment No. 1 to the Amended and Restated Elective Deferral Plan for Non-Employee Directors (15)
10.11(b)-   Amendment No. 2 to the Amended and Restated Elective Deferral Plan for Non-Employee Directors
10.12   -   Amended and Restated Retirement Plan for Non-Employee  Directors
10.12(a)-   Amendment to the Amended and Restated Retirement Plan for Non-Employee Directors
10.13   -   Restricted Stock Plan for Non-Employee Directors (13)
10.13(a)-   Amendment to the Restricted Stock Plan for Non-Employee Directors
10.14   -   Non-Employee Directors Benefit Plans Trust Agreement
10.14(a)-   Amendment to the Non-Employee Directors Benefit Plans Trust Agreement
 
OTHER MATERIAL CONTRACTS:
 
10.15   -   Conveyance (conformed without exhibits) between the Registrant and ARCO (1)
10.16   -   Asset Purchase Agreement (conformed without exhibits) between the Registrant and Rexene Products
            Company (2)
10.17   -   Amended and Restated Limited Liability Company Regulations of LYONDELL-CITGO Refining Company Ltd. (5)
10.17(a)-   Amendment No. 1 to the Amended and Restated Limited Liability Company Regulations of
            LYONDELL-CITGO Refining Company Ltd. (8)
10.17(b)-   Amendment No. 2 to the Amended and Restated Limited Liability Company Regulations of
            LYONDELL-CITGO Refining Company Ltd.
10.17(c)-   Amendment No. 3 to the Amended and Restated Limited Liability Company Regulations of
            LYONDELL-CITGO Refining Company Ltd.
10.18   -   Contribution Agreement between the Registrant and LYONDELL-CITGO Refining Company Ltd. (5)
10.19   -   Crude Oil Supply Agreement between LYONDELL-CITGO Refining Company Ltd. and Lagoven, S.A. (5)
10.20   -   Asset Purchase Agreement between the Registrant and Occidental Chemical Company. (9)
10.21   -   Limited Partnership Agreement of Equistar Chemicals, LP (18)
10.22   -   Asset Contribution Agreement among the Registrant, Lyondell Petrochemical LP and Equistar
            Chemicals, LP (18)
10.23   -   Asset Contribution Agreement among Millennium Petrochemicals Inc., Millennium LP and Equistar
            Chemicals, LP (18)
10.24   -   Parent Agreement among the Registrant, Millennium Chemicals Inc. and Equistar Chemicals, LP (18)
10.25   -   Master Transaction Agreement between the Registrant, Equistar Chemicals, LP, Occidental Petroleum
            Corporation and Millennium Chemicals Inc.
21      -   Subsidiaries of the Registrant
23(a)   -   Consent of Coopers & Lybrand L.L.P
23(b)   -   Consent of Coopers & Lybrand L.L.P. and Price Waterhouse L.L.P.
24      -   Powers of Attorney
27      -   Financial Data Schedule
 
</TABLE>

(1)    Filed as an exhibit to Registrant's Registration Statement on Form S-1
       (No. 33-25407) and incorporated herein by reference.
(2)    Filed as an exhibit to Registrant's Annual Report on Form 10-K Report for
       the year ended December 31, 1989 and incorporated herein by reference.
(3)    Filed as an exhibit to Registrant's Annual Report on Form 10-K Report for
       the year ended December 31, 1990 and incorporated herein by reference.
(4)    Filed as an exhibit to Registrant's Annual Report on Form 10-K Report for
       the year ended December 31, 1992 and incorporated herein by reference.


                                      101
<PAGE>
 
(5)    Filed as an exhibit to Registrant's Interim Report on Form 8-K dated as
       of July 1, 1993 and incorporated herein by reference.
(6)    Filed as an exhibit to Registrant's Annual Report on Form 10-K for the
       year ended December 31, 1993 and incorporated herein by reference.
(7)    Filed as an exhibit to Registrant's Annual Report on Form 10-K for the
       year ended December, 31, 1994 and incorporated herein by reference.
(8)    Filed as an exhibit to Registrant's Quarterly Report on Form 10-Q for the
       quarter ended March 31, 1995 and incorporated herein by reference.
(9)    Filed as an exhibit to Registrant's Interim Report on Form 8-K dated as
       of May 1, 1995 and incorporated herein by reference.
(10)   Filed as an exhibit to Registrant's Quarterly Report on Form 10-Q for the
       quarter ended September 30, 1995 and incorporated herein by reference.
(11)   Filed as an exhibit to Registrant's Interim Report on Form 8-K dated
       December 8, 1995 and incorporated herein by reference.
(12)   Filed as an exhibit to Registrant's Registration Statement on Form S-3
       dated as of January 31, 1996 and incorporated herein by reference.
(13)   Filed as an exhibit to Registrant's Quarterly Report on Form 10-Q for the
       period ended March 31, 1996 and incorporated herein by reference.
(14)   Filed as an exhibit to Registrant's Quarterly Report on Form 10-Q for the
       period ended September 30, 1996 and incorporated herein by reference.
(15)   Filed as an exhibit to Registrant's Annual Report on Form 10-K for the
       year ended December 31, 1996 and incorporated herein by reference.
(16)   Filed as an exhibit to Registrant's Quarterly Report on Form 10-Q for the
       period ended June 30, 1997 and incorporated herein by reference.
(17)   Filed as an exhibit to Registrant's Interim Report on Form 8-K dated as
       of July 25, 1997 and incorporated herein by reference.
(18)   Filed as an exhibit to Registrant's Interim Report on Form 8-K dated as
       of October 17, 1997 and incorporated herein by reference.

  (b)  Consolidated Financial Statements and Financial Statement Schedules

          (1)  Consolidated Financial Statements

          Consolidated Financial Statements filed as part of this Annual Report
          on Form 10-K are listed in the Index to Financial Statements on 
          page 40.

          (2)  Financial Statement Schedules

          Financial statement schedules are omitted because they are
          not applicable or the required information is contained in the
          Financial Statements or notes thereto.

          Copies of exhibits will be furnished upon prepayment of 25 cents per
          page. Requests should be addressed to the Secretary.

  (c)  Reports on Form 8-K:

          The following Current Reports on Form 8-K were filed during the
          quarter ended December 31, 1997 through March 26, 1998.
 
          Date of Report            Item No.  Financial Statements
          --------------            --------  --------------------
 
          October 17, 1997             7               No
 
          December 1, 1997             2               Yes
 
          March 13, 1998            4 and 5            No  


                                      102

 

<PAGE>
 
 
                                   SIGNATURES

PURSUANT TO THE REQUIREMENTS OF SECTION 13 OF THE SECURITIES EXCHANGE ACT OF
1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON ITS BEHALF BY
THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.

                              LYONDELL PETROCHEMICAL COMPANY

                              By:   DAN F. SMITH*
                                    --------------------------
                                    Dan F. Smith
                                    President and Chief Executive Officer

PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS REPORT
HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS ON BEHALF OF THE REGISTRANT AND
IN THE CAPACITIES AND ON THE DATES INDICATED.
<TABLE>
<CAPTION>
 
                   SIGNATURE                                     TITLE                        DATE
                   ---------                                     -----                        ----       
<S>                                                              <C>                          <C>
 
 
WILLIAM T. BUTLER*                                   Chairman of the Board                          March 30, 1998 
- -----------------------------------------------                                                                    
(William T. Butler)                                                                                                
                                                                                                                   
                                                                                                                   
                                                                                                                   
DAN F. SMITH*                                        President, Chief Executive Officer and         March 30, 1998 
- -----------------------------------------------      Director                                                      
(Dan F. Smith, Principal Executive Officer)                                                                        
                                                                                                                   
                                                                                                                   
                                                                                                                   
CURTIS J. CRAWFORD*                                  Director                                       March 30, 1998 
- -----------------------------------------------                                                                    
(Curtis J. Crawford)                                                                                               
                                                                                                                   
                                                                                                                   
TRAVIS ENGEN*                                        Director                                       March 30, 1998 
- -----------------------------------------------                                                                    
(Travis Engen)                                                                                                     
                                                                                                                   
                                                                                                                   
                                                                                                                   
STEPHEN F. HINCHLIFFE, JR.*                          Director                                       March 30, 1998 
- -----------------------------------------------                                                                    
(Stephen F. Hinchliffe, Jr.)                                                                                      
                                                                                                                   
                                                                                                                   
DUDLEY C. MECUM II*                                  Director                                       March 30, 1998 
- -----------------------------------------------                                                                    
(Dudley C. Mecum  II)                                                                                              
                                                                                                                   
                                                                                                                   
                                                                                                                   
PAUL R. STALEY*                                      Director                                       March 30, 1998 
- -----------------------------------------------                                                                    
(Paul R. Staley)                                                                                                   
                                                                                                                   
                                                                                                                   
EDWARD W. RICH*                                      Vice President, Finance and Treasurer          March 30, 1998 
- -----------------------------------------------                                                                    
(Edward W. Rich, Principal Financial and                                                                           
 Accounting Officer)                                                                                               
                                                                                                                   
                                                                                                                   
*By: JEFFREY R. PENDERGRAFT                                                                         March 30, 1998  
     -----------------------------
     (Jeffrey R. Pendergraft, as Attorney-in-fact)
</TABLE>

                                      103


<PAGE>
 
                                                                  EXHIBIT 4.1(A)




                                                                  EXECUTION COPY


                        LYONDELL PETROCHEMICAL COMPANY,

                            EQUISTAR CHEMICALS, LP

                                      AND

                   TEXAS COMMERCE BANK NATIONAL ASSOCIATION,

                                    TRUSTEE



                         SECOND SUPPLEMENTAL INDENTURE

                                  DATED AS OF

                               DECEMBER 1, 1997

                                      TO

                                   INDENTURE

                                  DATED AS OF

                                 MAY 31, 1989

             (AS SUPPLEMENTED BY THE FIRST SUPPLEMENTAL INDENTURE
                           DATED AS OF MAY 31, 1989)
<PAGE>
 
          THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplement"), dated as of
December 1, 1997, between Lyondell Petrochemical Company, a Delaware corporation
("Lyondell"), Equistar Chemicals, LP, a Delaware limited partnership
("Equistar") and Texas Commerce Bank National Association, as Trustee (the
"Trustee"), supplements the Indenture dated as of May 31, 1989 (the
"Indenture"), between Lyondell and the Trustee, as supplemented by the First
Supplemental Indenture dated as of May 31, 1989 (the "First Supplemental
Indenture"), pursuant to which the Company's 10.00% Notes Due 1999 (the "Notes")
were issued and are outstanding.

                                   RECITALS

          WHEREAS, Lyondell has executed and delivered to the Trustee the
Indenture, providing for the issuance from time to time of Lyondell's unsecured
debentures, notes or other evidences of indebtedness, issuable in one or more
series (the "Securities"), and Lyondell has executed and delivered to the
Trustee the First Supplemental Indenture, providing for the issuance of the
Notes, which are Securities under the Indenture;

          WHEREAS, Lyondell and Millennium Chemicals Inc., a Delaware
corporation ("Millennium"), have entered into a Master Transaction Agreement
dated July 25, 1997, as amended (the "Master Transaction Agreement"), which
provides that, on the Closing Date (as defined in the Master Transaction
Agreement) each of Lyondell and Millennium will contribute or cause to be
contributed certain assets to a joint venture partnership and that such joint
venture partnership will assume certain liabilities of each of Lyondell and
Millennium;

          WHEREAS, Lyondell has caused two of its wholly-owned subsidiaries,
Lyondell Petrochemical L.P. Inc. ("Lyondell LP") and Lyondell Petrochemical G.P.
Inc., each a Delaware corporation, and Millennium has caused two of its wholly-
owned subsidiaries, to execute and deliver the Limited Partnership Agreement of
Equistar dated as of October 10, 1997, and Equistar has been organized by the
partners thereof to serve as the joint venture partnership contemplated by the
Master Transaction Agreement;

          WHEREAS, the Master Transaction Agreement provides that Lyondell will
contribute certain specified assets (the "Assets") to Equistar and that Equistar
will assume certain specified liabilities of Lyondell, including the Notes,
pursuant to an Asset Contribution Agreement to be entered into on the Closing
Date between Lyondell, Lyondell LP and Equistar (the "Asset Contribution
Agreement"), the form of which is attached as an exhibit  to the Master
Transaction Agreement;

          WHEREAS, pursuant to the Asset Contribution Agreement, on the Closing
Date, Lyondell will contribute the Assets to Equistar and Equistar will assume
the Notes;
<PAGE>
 
          WHEREAS, Section 12.01 of the Indenture provides that nothing
contained in the Indenture or in any of the Securities shall prevent any sale or
conveyance of all or substantially all the property of Lyondell to any other
corporation, provided that upon any such sale or conveyance the due and punctual
payment of the principal of and premium, if any, and interest, if any, on all of
the Securities, according to their tenor, and the due and punctual performance
and observance of all of the covenants and conditions of the Indenture and in
such series to be performed by Lyondell shall be expressly assumed, by
supplemental indenture, by the corporation which shall have acquired such
property;

          WHEREAS, for purposes of Section 12.01 of the Indenture, the Assets
constitute substantially all of the assets of Lyondell;

          WHEREAS, pursuant to Section 12.03 of the Indenture, upon such
assumption by supplemental indenture as specified in the foregoing paragraph,
the transferee shall succeed to and be substituted for Lyondell, with the same
effect as if it had been named in the Indenture;

          WHEREAS, Section 11.01 of the Indenture provides that under certain
conditions, Lyondell and the Trustee may, from time to time and at any time
enter into an indenture or indentures supplemental to the Indenture, inter alia,
to evidence the succession of another corporation to the Company and the
assumption by any such successor, pursuant to Article 12 of the Indenture of the
covenants, agreements and obligations of Lyondell contained in the Indenture and
the Securities; and

          WHEREAS, in connection with the contribution of the Assets to Equistar
by Lyondell and the assumption of the Notes by Equistar, Lyondell and Equistar
have duly determined to make, execute and deliver to the Trustee this Supplement
pursuant to the Indenture;

          NOW, THEREFORE, THIS SUPPLEMENT WITNESSETH:

          In consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
to comply with Sections 12.01 and 12.03 of the Indenture, the parties hereto
hereby agree, for the equal and proportionate benefit of the respective Holders
from time to time of the Securities, as follows:

                                  SECTION ONE

                                  DEFINITIONS

          Capitalized terms used and not otherwise defined herein have the
respective meanings assigned to such terms in the Indenture.

                                      -3-
<PAGE>
 
                                  SECTION TWO

                       SUCCESSION BY TRANSFER OF ASSETS

          On the Closing Date, the Assets will be transferred to Equistar, and
effective upon such transfer, (a) Equistar hereby expressly assumes the due and
punctual payment of the principal of and premium, if any, and interest, if any,
on all of the Securities of each series and the due and punctual performance of
all of the covenants and conditions of the Indenture, as supplemented by the
First Supplemental Indenture and this Supplement, and in such series to be
performed by Lyondell; and (b) Equistar will succeed to and be substituted for
Lyondell as the "Company" for purposes of the Indenture, with the same effect as
if Equistar had been named as the "Company" in the Indenture, as supplemented;
provided, however, that Lyondell shall not be released from any of its
obligations under the Indenture and under the Securities of each series,
including the obligation to pay the principal of and premium, if any, and
interest, if any, on the Securities.

          After the Closing Date, for purposes of the Indenture, the term
"Company" shall mean and include both Equistar and Lyondell, and Equistar shall
not be a "Subsidiary" of Lyondell.

                                 SECTION THREE

                                 RATIFICATION

          Except as expressly amended and supplemented on this Supplement, the
Indenture shall remain unchanged and in full force and effect.  This Supplement
shall be construed as supplemental to the Indenture and shall form a part
thereof.

                                 SECTION FOUR

                                 GOVERNING LAW

          This Supplement shall be governed by and construed in accordance with
the laws of the State of New York applicable to agreements made and to be
performed therein.

                                 SECTION FIVE

                                 COUNTERPARTS

          This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                      -4-
<PAGE>
 
          IN WITNESS WHEREOF, each of Lyondell Petrochemical Company and
Equistar Chemicals, LP have caused this Second Supplemental Indenture to be duly
executed and its seal to be affixed hereunto and the same to be attested by its
Secretary or an Assistant Secretary, and Texas Commerce Bank National
Association as Trustee, has caused this Second Supplemental Indenture to be
signed by one of its Vice Presidents or Assistant Vice Presidents as of the day
and year first above written.

                                   LYONDELL PETROCHEMICAL COMPANY


[SEAL]                             By   /s/ Russell S. Young
                                      ---------------------------------------
                                       Name:  Russell S. Young
                                       Title: Senior Vice President, Chief
                                               Financial Officer and Treasurer

Attest:

     /s/ Kerry A. Galvin
- -------------------------------
Name:  Kerry A. Galvin
Title: Assistant Secretary


                                   EQUISTAR CHEMICALS, LP


[SEAL]                             By   /s/ Joseph M. Putz
                                      ---------------------------------------
                                       Name:  Joseph M. Putz
                                       Title: Senior Vice President, Finance
                                               and Administration

Attest:

     /s/ Gerald A. O'Brien
- -------------------------------
Name:  Gerald A. O'Brien
Title: Vice President and Secretary


                                   TEXAS COMMERCE BANK NATIONAL
                                   ASSOCIATION, Trustee


                                   By   /s/ Mauri J. Cowen
                                      ---------------------------------------
                                       Name:  Mauri J. Cowen
                                       Title: Vice President and Trust Officer

                                      -5-

<PAGE>
 
                                                                  EXHIBIT 4.2(A)


                                                                  EXECUTION COPY


                        LYONDELL PETROCHEMICAL COMPANY,

                            EQUISTAR CHEMICALS, LP

                                      AND

                       FIRST TRUST NATIONAL ASSOCIATION,

                                    TRUSTEE



                         SECOND SUPPLEMENTAL INDENTURE

                                  DATED AS OF

                               DECEMBER 1, 1997

                                      TO

                                   INDENTURE

                                  DATED AS OF

                                MARCH 10, 1992

             (AS SUPPLEMENTED BY THE FIRST SUPPLEMENTAL INDENTURE
                          DATED AS OF MARCH 10, 1992)
<PAGE>
 
          THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplement"), dated as of
December 1, 1997, between Lyondell Petrochemical Company, a Delaware corporation
("Lyondell"), Equistar Chemicals, LP, a Delaware limited partnership
("Equistar") and First Trust National Association, as Trustee (the "Trustee"),
supplements the Indenture dated as of March 10, 1992 (the "Indenture"), between
Lyondell and Continental Bank, National Association, as the previous Trustee
under the Indenture, as supplemented by the First Supplemental Indenture dated
as of March 10, 1992 (the "First Supplemental Indenture"), pursuant to which the
Company's 9.125% Notes Due 2002 (the "Notes") were issued and are outstanding.

                                   RECITALS

          WHEREAS, Lyondell has executed and delivered to the Trustee the
Indenture, providing for the issuance from time to time of Lyondell's unsecured
debentures, notes or other evidences of indebtedness, issuable in one or more
series (the "Securities"), and Lyondell has executed and delivered to the
Trustee the First Supplemental Indenture, providing for the issuance of the
Notes, which are Securities under the Indenture;

          WHEREAS, Lyondell and Millennium Chemicals Inc., a Delaware
corporation ("Millennium"), have entered into a Master Transaction Agreement
dated July 25, 1997, as amended (the "Master Transaction Agreement"), which
provides that, on the Closing Date (as defined in the Master Transaction
Agreement) each of Lyondell and Millennium will contribute or cause to be
contributed certain assets to a joint venture partnership and that such joint
venture partnership will assume certain liabilities of each of Lyondell and
Millennium;

          WHEREAS, Lyondell has caused two of its wholly-owned subsidiaries,
Lyondell Petrochemical L.P. Inc. ("Lyondell LP") and Lyondell Petrochemical G.P.
Inc., each a Delaware corporation, and Millennium has caused two of its wholly-
owned subsidiaries, to execute and deliver the Limited Partnership Agreement of
Equistar dated as of October 10, 1997, and Equistar has been organized by the
partners thereof to serve as the joint venture partnership contemplated by the
Master Transaction Agreement;

          WHEREAS, the Master Transaction Agreement provides that Lyondell will
contribute certain specified assets (the "Assets") to Equistar and that Equistar
will assume certain specified liabilities of Lyondell, including the Notes,
pursuant to an Asset Contribution Agreement to be entered into on the Closing
Date between Lyondell, Lyondell LP and Equistar (the "Asset Contribution
Agreement"), the form of which is attached as an exhibit  to the Master
Transaction Agreement;

          WHEREAS, pursuant to the Asset Contribution Agreement, on the Closing
Date, Lyondell will contribute the Assets to Equistar and Equistar will assume
the Notes;
<PAGE>
 
          WHEREAS, Section 12.01 of the Indenture provides that nothing
contained in the Indenture or in any of the Securities shall prevent any sale or
conveyance of all or substantially all the property of Lyondell to any other
corporation, provided that upon any such sale or conveyance the due and punctual
payment of the principal of and premium, if any, and interest, if any, on all of
the Securities, according to their tenor, and the due and punctual performance
and observance of all of the covenants and conditions of the Indenture and in
such series to be performed by Lyondell shall be expressly assumed, by
supplemental indenture, by the corporation which shall have acquired such
property;

          WHEREAS, for purposes of Section 12.01 of the Indenture, the Assets
constitute substantially all of the assets of Lyondell;

          WHEREAS, pursuant to Section 12.03 of the Indenture, upon such
assumption by supplemental indenture as specified in the foregoing paragraph,
the transferee shall succeed to and be substituted for Lyondell, with the same
effect as if it had been named in the Indenture;

          WHEREAS, Section 11.01 of the Indenture provides that under certain
conditions, Lyondell and the Trustee may, from time to time and at any time
enter into an indenture or indentures supplemental to the Indenture, inter alia,
to evidence the succession of another corporation to the Company and the
assumption by any such successor, pursuant to Article 12 of the Indenture of the
covenants, agreements and obligations of Lyondell contained in the Indenture and
the Securities; and

          WHEREAS, in connection with the contribution of the Assets to Equistar
by Lyondell and the assumption of the Notes by Equistar, Lyondell and Equistar
have duly determined to make, execute and deliver to the Trustee this Supplement
pursuant to the Indenture;

          NOW, THEREFORE, THIS SUPPLEMENT WITNESSETH:

          In consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
to comply with Sections 12.01 and 12.03 of the Indenture, the parties hereto
hereby agree, for the equal and proportionate benefit of the respective Holders
from time to time of the Securities, as follows:

                                  SECTION ONE

                                  DEFINITIONS

          Capitalized terms used and not otherwise defined herein have the
respective meanings assigned to such terms in the Indenture.

                                      -3-
<PAGE>
 
                                  SECTION TWO

                       SUCCESSION BY TRANSFER OF ASSETS

          On the Closing Date, the Assets will be transferred to Equistar, and
effective upon such transfer, (a) Equistar hereby expressly assumes the due and
punctual payment of the principal of and premium, if any, and interest, if any,
on all of the Securities of each series, according to their tenor, and the due
and punctual performance and observance of all of the covenants and conditions
of the Indenture, as supplemented by the First Supplemental Indenture and this
Supplement, and in such series to be performed by Lyondell; and (b) Equistar
will succeed to and be substituted for Lyondell as the "Company" for purposes of
the Indenture, with the same effect as if Equistar had been named as the
"Company" in the Indenture, as supplemented; provided, however, that Lyondell
shall not be released from any of its obligations under the Indenture and under
the Securities of each series, including the obligation to pay the principal of
and premium, if any, and interest, if any, on the Securities.

          After the Closing Date, for purposes of the Indenture, the term
"Company" shall mean and include both Equistar and Lyondell, and Equistar shall
not be a "Subsidiary" of Lyondell.

                                 SECTION THREE

                                 RATIFICATION

          Except as expressly amended and supplemented on this Supplement, the
Indenture shall remain unchanged and in full force and effect.  This Supplement
shall be construed as supplemental to the Indenture and shall form a part
thereof.

                                 SECTION FOUR

                                 GOVERNING LAW

          This Supplement shall be governed by and construed in accordance with
the laws of the State of New York applicable to agreements made and to be
performed therein.

                                 SECTION FIVE

                                 COUNTERPARTS

          This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                      -4-
<PAGE>
 
          IN WITNESS WHEREOF, each of Lyondell Petrochemical Company and
Equistar Chemicals, LP have caused this Second Supplemental Indenture to be duly
executed and its seal to be affixed hereunto and the same to be attested by its
Secretary or an Assistant Secretary, and First Trust National Association as
Trustee, has caused this Second Supplemental Indenture to be signed by one of
its Vice Presidents or Assistant Vice Presidents as of the day and year first
above written.


                                   LYONDELL PETROCHEMICAL COMPANY


[SEAL]                             By   /s/ Russell S. Young
                                      ---------------------------------------
                                       Name:  Russell S. Young
                                       Title: Senior Vice President, Chief
                                               Financial Officer and Treasurer

Attest:

     /s/ Kerry A. Galvin
- -------------------------------
Name:  Kerry A. Galvin
Title: Assistant Secretary


                                   EQUISTAR CHEMICALS, LP


[SEAL]                             By   /s/ Joseph M. Putz
                                      ---------------------------------------
                                       Name:  Joseph M. Putz
                                       Title: Senior Vice President, Finance
                                               and Administration

Attest:

     /s/ Gerald A. O'Brien
- -------------------------------
Name:  Gerald A. O'Brien
Title: Vice President and Secretary


                                   FIRST TRUST NATIONAL
                                   ASSOCIATION, Trustee


                                   By   /s/ Bud W. Lord
                                      ---------------------------------------
                                       Name:  Bud W. Lord
                                       Title: Asst. Vice President 

                                      -5-

<PAGE>
 
                                                                  EXHIBIT 4.3(A)


                                                                  EXECUTION COPY


                        LYONDELL PETROCHEMICAL COMPANY,

                            EQUISTAR CHEMICALS, LP

                                      AND

                   TEXAS COMMERCE BANK NATIONAL ASSOCIATION,

                                    TRUSTEE



                         SECOND SUPPLEMENTAL INDENTURE

                                  DATED AS OF

                               DECEMBER 1, 1997

                                      TO

                                   INDENTURE

                                  DATED AS OF

                               JANUARY 29, 1996

             (AS SUPPLEMENTED BY THE FIRST SUPPLEMENTAL INDENTURE
                        DATED AS OF FEBRUARY 15, 1996)
<PAGE>
 
          THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplement"), dated as of
December 1, 1997, between Lyondell Petrochemical Company, a Delaware corporation
("Lyondell"), Equistar Chemicals, LP, a Delaware limited partnership
("Equistar") and Texas Commerce Bank National Association, as Trustee (the
"Trustee"), supplements the Indenture dated as of January 29, 1996 (the
"Indenture"), between Lyondell and the Trustee, as supplemented by the First
Supplemental Indenture dated as of February 15, 1996 (the "First Supplemental
Indenture"), pursuant to which the Company's 6.50% Notes Due 2006 and 7.55%
Notes Due 2026 (collectively, the "Notes") were issued and are outstanding.

                                   RECITALS

          WHEREAS, Lyondell has executed and delivered to the Trustee the
Indenture, providing for the issuance from time to time of Lyondell's unsecured
debentures, notes or other evidences of indebtedness, issuable in one or more
series (the "Securities"), and Lyondell has executed and delivered to the
Trustee the First Supplemental Indenture, providing for the issuance of the
Notes, which are Securities under the Indenture;

          WHEREAS, Lyondell and Millennium Chemicals Inc., a Delaware
corporation ("Millennium"), have entered into a Master Transaction Agreement
dated July 25, 1997, as amended (the "Master Transaction Agreement"), which
provides that, on the Closing Date (as defined in the Master Transaction
Agreement) each of Lyondell and Millennium will contribute or cause to be
contributed certain assets to a joint venture partnership and that such joint
venture partnership will assume certain liabilities of each of Lyondell and
Millennium;

          WHEREAS, Lyondell has caused two of its wholly-owned subsidiaries,
Lyondell Petrochemical L.P. Inc. ("Lyondell LP") and Lyondell Petrochemical G.P.
Inc., each a Delaware corporation, and Millennium has caused two of its wholly-
owned subsidiaries, to execute and deliver the Limited Partnership Agreement of
Equistar dated as of October 10, 1997, and Equistar has been organized by the
partners thereof to serve as the joint venture partnership contemplated by the
Master Transaction Agreement;

          WHEREAS, the Master Transaction Agreement provides that Lyondell will
contribute certain specified assets (the "Assets") to Equistar and that Equistar
will assume certain specified liabilities of Lyondell, including the Notes,
pursuant to an Asset Contribution Agreement to be entered into on the Closing
Date between Lyondell, Lyondell LP and Equistar (the "Asset Contribution
Agreement"), the form of which is attached as an exhibit  to the Master
Transaction Agreement;

          WHEREAS, pursuant to the Asset Contribution Agreement, on the Closing
Date, Lyondell will contribute the Assets to Equistar and Equistar will assume
the Notes;

          WHEREAS, Section 12.01 of the Indenture provides that nothing
contained in the Indenture or in any of the Securities shall prevent any sale or
conveyance of all or substantially all 
<PAGE>
 
the property of Lyondell to any other corporation, provided that upon any such
sale or conveyance the due and punctual payment of the principal of and premium,
if any, and interest, if any, on all of the Securities, according to their
tenor, and the due and punctual performance and observance of all of the
covenants and conditions of the Indenture and in such series to be performed by
Lyondell shall be expressly assumed, by supplemental indenture, by the
corporation which shall have acquired such property;

          WHEREAS, for purposes of Section 12.01 of the Indenture, the Assets
constitute substantially all of the assets of Lyondell;

          WHEREAS, pursuant to Section 12.03 of the Indenture, upon such
assumption by supplemental indenture as specified in the foregoing paragraph,
the transferee shall succeed to and be substituted for Lyondell, with the same
effect as if it had been named in the Indenture;

          WHEREAS, Section 11.01 of the Indenture provides that under certain
conditions, Lyondell and the Trustee may, from time to time and at any time
enter into an indenture or indentures supplemental to the Indenture, inter alia,
to evidence the succession of another corporation to the Company and the
assumption by any such successor, pursuant to Article 12 of the Indenture of the
covenants, agreements and obligations of Lyondell contained in the Indenture and
the Securities; and

          WHEREAS, in connection with the contribution of the Assets to Equistar
by Lyondell and the assumption of the Notes by Equistar, Lyondell and Equistar
have duly determined to make, execute and deliver to the Trustee this Supplement
pursuant to the Indenture;

          NOW, THEREFORE, THIS SUPPLEMENT WITNESSETH:

          In consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
to comply with Sections 12.01 and 12.03 of the Indenture, the parties hereto
hereby agree, for the equal and proportionate benefit of the respective Holders
from time to time of the Securities, as follows:

                                  SECTION ONE

                                  DEFINITIONS

          Capitalized terms used and not otherwise defined herein have the
respective meanings assigned to such terms in the Indenture.

                                      -3-
<PAGE>
 
                                  SECTION TWO

                       SUCCESSION BY TRANSFER OF ASSETS

          On the Closing Date, the Assets will be transferred to Equistar, and
effective upon such transfer, (a) Equistar hereby expressly assumes the due and
punctual payment of the principal of and premium, if any, and interest, if any,
on all of the Securities of each series and the due and punctual performance of
all of the covenants and conditions of the Indenture, as supplemented by the
First Supplemental Indenture and this Supplement, and in such series to be
performed by Lyondell; and (b) Equistar will succeed to and be substituted for
Lyondell as the "Company" for purposes of the Indenture, with the same effect as
if Equistar had been named as the "Company" in the Indenture, as supplemented;
provided, however, that Lyondell shall not be released from any of its
obligations under the Indenture and under the Securities of each series,
including the obligation to pay the principal of and premium, if any, and
interest, if any, on the Securities.

          After the Closing Date, for purposes of the Indenture, the term
"Company" shall mean and include both Equistar and Lyondell, and Equistar shall
not be a "Subsidiary" of Lyondell.

                                 SECTION THREE

                                 RATIFICATION

          Except as expressly amended and supplemented on this Supplement, the
Indenture shall remain unchanged and in full force and effect.  This Supplement
shall be construed as supplemental to the Indenture and shall form a part
thereof.

                                 SECTION FOUR

                                 GOVERNING LAW

          This Supplement shall be governed by and construed in accordance with
the laws of the State of New York applicable to agreements made and to be
performed therein.

                                 SECTION FIVE

                                 COUNTERPARTS

          This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                      -4-
<PAGE>
 
          IN WITNESS WHEREOF, each of Lyondell Petrochemical Company and
Equistar Chemicals, LP have caused this Second Supplemental Indenture to be duly
executed and its seal to be affixed hereunto and the same to be attested by its
Secretary or an Assistant Secretary, and Texas Commerce Bank National
Association as Trustee, has caused this Second Supplemental Indenture to be
signed by one of its Vice Presidents or Assistant Vice Presidents as of the day
and year first above written.


                                   LYONDELL PETROCHEMICAL COMPANY


[SEAL]                             By   /s/ Russell S. Young
                                      ---------------------------------------
                                       Name:  Russell S. Young
                                       Title: Senior Vice President, Chief
                                               Financial Officer and Treasurer

Attest:

     /s/ Kerry A. Galvin
- -------------------------------
Name:  Kerry A. Galvin
Title: Assistant Secretary


                                   EQUISTAR CHEMICALS, LP


[SEAL]                             By   /s/ Joseph M. Putz
                                      ---------------------------------------
                                       Name:  Joseph M. Putz
                                       Title: Senior Vice President, Finance
                                               and Administration

Attest:

     /s/ Gerald A. O'Brien
- -------------------------------
Name:  Gerald A. O'Brien
Title: Vice President and Secretary


                                   TEXAS COMMERCE BANK NATIONAL
                                   ASSOCIATION, Trustee


                                   By   /s/ Mauri J. Cowen
                                      ---------------------------------------
                                       Name:  Mauri J. Cowen
                                       Title: Vice President and Trust Officer

                                      -5-

<PAGE>
 
                                                                     EXHIBIT 4.7
 
________________________________________________________________________________



                        LYONDELL PETROCHEMICAL COMPANY

                                 $225,000,000


                               CREDIT AGREEMENT

                         DATED AS OF DECEMBER 1, 1997



                   TEXAS COMMERCE BANK NATIONAL ASSOCIATION,
                           AS ADMINISTRATIVE AGENT,

            BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION,
                           AS  DOCUMENTATION AGENT,

                           THE CHASE MANHATTAN BANK,
                               AS AUCTION AGENT,

                                      AND

                   THE BANKS FROM TIME TO TIME PARTY HERETO


________________________________________________________________________________
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                             <C>
                                   ARTICLE I
                                  DEFINITIONS
SECTION
     1.01.   Definitions........................................................ 1
     1.02.   Accounting Terms and Determinations................................18
     1.03.   Types of Loans and Borrowings......................................18
     1.04.   Terms Generally....................................................18

                                  ARTICLE II
                                  THE CREDITS

     2.01.   Commitments to Lend................................................19
     2.02.   Notice of Committed Borrowings.....................................21
     2.03.   Letters of Credit..................................................22
     2.04.   Notice to Banks; Funding of Committed Loans........................27
     2.05.   Committed Notes....................................................28
     2.06.   Maturity of Committed Loans........................................29
     2.07.   Interest Rates.....................................................29
     2.08.   Conversions and Continuances.......................................30
     2.09.   Pro Rata Committed Borrowings......................................31
     2.10.   Competitive Borrowings.............................................31
     2.11.   Optional Termination or Reduction of Commitments...................35
     2.12.   Mandatory Termination of Commitments...............................35
     2.13.   Optional Prepayments...............................................35
     2.14.   General Provisions as to Payments..................................36
     2.15.   Funding Losses.....................................................36
     2.16.   Fees...............................................................37
     2.17.   Computation of Interest and Fees...................................37
     2.18.   Maximum Interest Rate..............................................38
     2.19.   Withholding Tax Exemption..........................................40

                                  ARTICLE III
                                  CONDITIONS

SECTION
     3.01.   Effectiveness......................................................41
     3.02.   Credit Events......................................................43
</TABLE>
<PAGE>
 
<TABLE>
<S>                                                                             <C>
                                  ARTICLE IV
                        REPRESENTATIONS AND WARRANTIES

SECTION
     4.01.   Representations and Warranties of the Borrower.....................45

                                   ARTICLE V
                                   COVENANTS

SECTION
     5.01.   Certain Information to be Furnished by the Borrower................50
     5.02.   Maintenance of Property; Insurance.................................54
     5.03.   Limitation on Liens................................................54
     5.04.   Consolidation, Merger, Disposition of Assets.......................57
     5.05.   Use of Proceeds....................................................58
     5.06.   Payment of Taxes...................................................58
     5.07.   LCR Matters........................................................58
     5.08.   Equistar Matters...................................................59
     5.09.   Financial Covenants................................................59
     5.10.   No Subsidiary Debt.................................................61
     5.11.   Disposition of Interests in Subsidiaries...........................61

                                  ARTICLE VI
                             DEFAULTS AND REMEDIES

SECTION
     6.01.   Defaults...........................................................62
     6.02.   Other Remedies.....................................................64
     6.03.   Rights of Setoff...................................................64

                                  ARTICLE VII
                                  THE AGENTS

SECTION
     7.01.   Appointment and Authorization......................................65
     7.02.   Agents and Affiliates..............................................65
     7.03.   Action by Agents...................................................65
     7.04.   Consultation with Experts..........................................65
     7.05.   Liability of Agents................................................66
     7.06.   INDEMNIFICATION....................................................66
     7.07.   Credit Decision....................................................66
     7.08.   Successor Agents...................................................67
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<S>                                                                             <C>
                                 ARTICLE VIII
                            CHANGE IN CIRCUMSTANCES

SECTION
     8.01.   Basis for Determining Interest Rate Inadequate or Unfair...........67
     8.02.   Illegality.........................................................68
     8.03.   Increased Cost and Reduced Return..................................68
     8.04.   Substitute Loans...................................................70
     8.05.   Regulation D Compensation..........................................71
     8.06.   Substitution of Bank...............................................71

                                  ARTICLE IX
                                 MISCELLANEOUS

SECTION
     9.01.   Notices............................................................72
     9.02.   No Waiver..........................................................72
     9.03.   GOVERNING LAW......................................................72
     9.04.   Expenses; Documentary Taxes; Indemnification.......................72
     9.05.   Amendments, Etc....................................................74
     9.06.   Counterparts; Integration..........................................74
     9.07.   Successors and Assigns.............................................74
     9.08.   Survival...........................................................76
     9.09.   Acknowledgment.....................................................76
     9.10.   Headings...........................................................76
     9.11.   Sharing of Setoffs.................................................76
     9.12.   Collateral.........................................................77
     9.13.   CONSENT TO JURISDICTION............................................77
     9.14.   FINAL AGREEMENT OF THE PARTIES.....................................78
</TABLE>

SCHEDULE I - Commitments
SCHEDULE 5.03(c) - Existing and Contemplated Liens

EXHIBIT 2.02 - Form of Notice of Committed Borrowing
EXHIBIT 2.03 - Form of Letter of Credit Request
EXHIBIT 2.05 - Form of Committed Note
EXHIBIT 2.08 - Form of Notice of Conversion
EXHIBIT 2.10(a) - Form of Competitive Bid Request
EXHIBIT 2.10(b) - Form of Notice of Competitive Bid Request
EXHIBIT 2.10(c) - Form of Competitive Bid
EXHIBIT 2.10(d) - Form of Competitive Note
EXHIBIT 3.01(ii) - Form of Certificate of Incumbency
EXHIBIT 3.01(iv) - Form of Opinion of Counsel for the Borrower

                                      iii
<PAGE>
 
EXHIBIT 3.01(v)  - Form of Opinion of Special Counsel for the Agents

                                      iv
<PAGE>
 
          THIS CREDIT AGREEMENT (this"Agreement") dated as of December 1, 1997
among LYONDELL PETROCHEMICAL COMPANY, a Delaware corporation, the BANKS listed
on the signature pages hereof and/or those BANKS that hereafter become party to
this Agreement pursuant to Section 9.07(c), TEXAS COMMERCE BANK NATIONAL
ASSOCIATION, as Administrative Agent, BANK OF AMERICA NATIONAL TRUST AND SAVINGS
ASSOCIATION, as Documentation Agent, and THE CHASE MANHATTAN BANK, as Auction
Agent.

          The Borrower (such term and each other capitalized term used but not
otherwise defined herein having the meaning assigned to it in Article I) has
requested the Banks to extend credit in order to enable it to borrow on a
revolving basis and obtain the issuance of Letters of Credit in an aggregate
amount not in excess of $225,000,000.  The proceeds of the Loans and the Letters
of Credit are to be used to provide working capital availability and for general
corporate purposes.  The Banks are willing to extend such credit to the Borrower
on the terms and subject to the conditions set forth herein.

          Accordingly, in consideration of the mutual agreements herein
contained and other good and valuable consideration, the sufficiency and receipt
of which are hereby acknowledged, the parties hereto hereby agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

     SECTION  1.01.   Definitions.  In addition to terms defined elsewhere in
                      -----------                                            
this Agreement, as used in this Agreement the following terms have the following
meanings (all terms defined in this Agreement in the singular to have the same
meanings when used in the plural and vice versa):
 
     "Administrative Questionnaire" means, with respect to each Bank, the
administrative questionnaire in the form submitted to such Bank by the
Administrative Agent and submitted to the Administrative Agent (with a copy to
the Borrower) duly completed by such Bank.

     "Administrative Agent" means Texas Commerce Bank National Association in
its capacity as administrative and syndication agent for the Banks hereunder and
its successors in such capacity.

     "Affiliate" means, with respect to any Person, any other Person directly or
indirectly controlling, controlled by, or under direct or indirect common
control with such Person.

                                       1
<PAGE>
 
     "Agents" means the Administrative Agent, the Documentation Agent and the
Auction Agent.

     "Agreement" has the meaning specified in the introduction hereto, as the
same may hereafter be amended, extended and modified from time to time.

     "Alternate Competitive Loan" means any Competitive Loan bearing interest at
a fixed percentage rate per annum specified by the Bank making such Loan in its
Competitive Bid.

     "Applicable Lending Office" means, with respect to any Bank, (i) in the
case of its Base Rate Loans, its Domestic Lending Office, (ii) in the case of
its Euro-Dollar Committed Loans and Euro-Dollar Competitive Loans, its Euro-
Dollar Lending Office, and (iii) with respect to the Issuing Bank, its Domestic
Lending Office.
 
     "Applicable Margin" means (a) 0.55% with respect to the Euro-Dollar
Committed Loans and 0.20% per annum with respect to the Facility Fee, in each
case for the period from the date of this Agreement until the first
Determination Date after the date of this Agreement and (b) for any subsequent
period from and including any Determination Date, beginning with the first
Determination Date after the date of this Agreement, if the Applicable
Percentage Ratio on the first day of such period is within a range set forth in
column A below, the per annum percentage equal to the percentage set forth for
that range in the column for Euro-Dollar Committed Loans or the Facility Fee, as
the case may be:

<TABLE> 
<CAPTION> 
       A                Euro-Dollar Committed Loans         Facility Fee
- --------------          ---------------------------         ------------
<S>                     <C>                                 <C> 
less than or equal                  0.55%                      0.20%
     to 1.0 to 1.0

greater than 1.0 to 1.0             0.75%                      0.25%
</TABLE> 

     "Applicable Percentage Ratio" means (a) as of any Determination Date as
defined in clause (a) of that definition, the ratio of (i) Consolidated Debt as
of the end of the Borrower's most recently ended fiscal quarter or fiscal year,
as the case may be, to (ii) Consolidated Cash Flow for the Borrower's four most
recently ended fiscal quarters and (b) as of any other Determination Date, a
ratio greater than 1.0 to 1.0 until such time as the Administrative Agent
receives the requisite financial statements referred to in clause (b) or (c) of
the definition of Determination Date, as the case may be.

     "Assignee" has the meaning set forth in Section 9.07(c).

                                       2
<PAGE>
 
     "Auction Agent" means The Chase Manhattan Bank in its capacity as auction
agent for the Banks hereunder and its successors in such capacity.

     "Authorized Officer" and "Authorized Representative" of the Borrower shall
mean an officer or other representative of the Borrower designated as such in
the latest Certificate of Incumbency of the Borrower. The Agents and the Banks
shall be conclusively entitled to rely on the latest such Certificate of
Incumbency of the Borrower delivered to the Administrative Agent.

     "Bank" means each financial institution which is listed on the signature
pages hereof as being a "Bank" and which has executed and delivered this
Agreement and/or each Assignee which becomes a "Bank" pursuant to Section
9.07(c), and their respective successors.

     "Base Rate" means, for any day, a rate per annum equal to the lesser of (i)
the higher of (x) the Prime Rate for such day, or (y) the Federal Funds Rate for
such day, plus 1/2 of 1 percent, or (ii) the Highest Lawful Rate.

     "Base Rate Loan" means a Committed Loan to be made by a Bank as a Base Rate
Loan in accordance with the applicable Notice of Committed Borrowing or pursuant
to Article VIII.

     "Borrower" means Lyondell Petrochemical Company, a Delaware corporation,
and its successors.

     "Borrowing" has the meaning set forth in Section 1.03.

     "Borrowing Date" means, with respect to each Borrowing, the Domestic
Business Day or Euro-Dollar Business Day upon which the proceeds of such
Borrowing are to be made available to the Borrower.

     "Certificate of Incumbency" shall mean a Certificate of Incumbency
described in clause (ii) of Section 3.01 and any successor or replacement
Certificate of Incumbency delivered hereunder.

     "CITGO" means CITGO Petroleum Corporation, a Delaware corporation, and its
successors and assigns.

     "CITGO Refining" means CITGO Refining Investment Company, an Oklahoma
corporation, and its successors (including any entity that assumes Citgo
Refining's obligations under the Company Regulations).

                                       3
<PAGE>
 
     "Code" means the Internal Revenue Code of 1986, as amended, or any
successor statute.

     "Commitment" means, as to each Bank, the amount set forth opposite its name
on Schedule I under the heading "Commitment" or as set forth in an instrument
signed by all appropriate parties in accordance with Section 9.07(c) (as such
amount may be increased from time to time pursuant to Section 2.01(b) or reduced
from time to time as provided in Section 2.10 or 2.11).
 
     "Commitment Percentage" of any Bank means, at any time, the ratio which its
Commitment bears to the aggregate of all the Banks' Commitments or, if the
Commitments have been terminated, the ratio which the aggregate outstanding
principal amount of the Committed Loans made by such Bank bears to the aggregate
outstanding principal amount of all Committed Loans made by the Banks.

     "Committed Amount" means, at any time, the aggregate principal amount of
the Commitments at such time.

     "Committed Borrowing" is a Borrowing under Sections 2.01 and 2.02.

     "Committed Loan" means a Loan made pursuant to Section 2.01.

     "Competitive Bid" means an offer by a Bank to the Borrower to make a
Competitive Loan in the form of Exhibit 2.10(c).

     "Competitive Bid Request" has the meaning set forth in Section 2.10(a).

     "Competitive Borrowing" is a Borrowing under Section 2.10.

     "Competitive Loan" means a Loan made pursuant to Section 2.10.

     "Consolidated Capital Expenditures" means, for any period with respect to
any Person, the gross additions to fixed assets attributable to cash flows from
investing activities as reflected on the consolidated statement of cash flows of
that Person and its Consolidated Subsidiaries for such period.

     "Consolidated Cash Flow" means, for any period with respect to the Borrower
and its Consolidated Subsidiaries, without duplication, (a) EBITDA of the
Borrower as of the end of that period, plus (b) all distributions to the
Borrower from earnings and all distributions to the Borrower in excess of
earnings from LCR, Equistar, Methanol and each Other Equity Person, in each
case, as reflected on the consolidated statement of cash flows of the Borrower
and its Consolidated Subsidiaries as of the end of that period, minus (c) an
amount equal to the sum of (i) the amount of all distributions to 

                                       4
<PAGE>
 
the Borrower derived from financing activities of LCR, Equistar, Methanol and
each Other Equity Person, plus (ii) the amount of all capital contributions by
the Borrower to LCR, Equistar, Methanol and each Other Equity Person.

     "Consolidated Debt" means, as of the date of any determination thereof with
respect to any Person, all Debt of that Person and its Consolidated
Subsidiaries.

     "Consolidated Interest Expense" means, for any period with respect to any
Person, the Interest Expense reflected on the consolidated statement of income
of that Person and its Consolidated Subsidiaries for such period.

     "Consolidated Net Income or Loss" means, for any period with respect to any
Person, the net income (loss) reflected on the consolidated statement of income
of that Person and its Consolidated Subsidiaries for such period.

     "Consolidated Net Tangible Assets" means, with respect to any Person, the
total amount of assets (less applicable reserves and other properly deductible
items) after deducting therefrom (i) all current liabilities (excluding any
liabilities that are by their terms extendible or renewable at the option of the
obligor thereon to a time more than 12 months after the time as of which the
amount thereof is being computed), and (ii) all goodwill, trade names,
trademarks, patents, purchased technology, unamortized debt discount and other
like intangible assets, all as set forth on the most recent quarterly
consolidated balance sheet of that Person and its Consolidated Subsidiaries.

     "Consolidated Subsidiary" means at any date with respect to any Person any
Subsidiary of that Person or other entity the accounts of which are consolidated
with those of that Person in that Person's consolidated financial statements as
of such date.

     "Controlled Group" means all members of a controlled group of corporations
and all trades or businesses (whether or not incorporated) under common control
which, together with the Borrower, are treated as a single employer under
Section 414(b) or 414(c) of the Code.
 
     "Credit Event" means the making of a Loan or the occasion of any other
Borrowing hereunder or the issuance, renewal or extension of any Letter of
Credit hereunder.

     "Debt" of any Person means without duplication, as of the date of any
determination thereof (i) the aggregate outstanding principal amount of all
indebtedness for borrowed money of such Person, (ii) all obligations of such
Person evidenced by bonds, debentures, notes or other similar instruments
(including letters of credit), (iii) all obligations of such Person to pay the
deferred purchase price of

                                       5
<PAGE>
 
property or services, except trade accounts payable incurred in the ordinary
course of business, (iv) the capitalized amount of all obligations of such
Person as lessee under capital leases, (v) all obligations of others of the type
described in clauses (i) through (iv) of this definition to the extent secured
by a Lien on any asset of such Person, whether or not such obligations are
assumed by such Person and (vi) all obligations of others of the type described
in clauses (i) through (iv) of this definition to the extent Guaranteed by such
Person.

     "Default" means any condition or event which constitutes an Event of
Default or which with the giving of notice or lapse of time or both would,
unless cured or waived, become an Event of Default.

     "Determination Date" means, for purposes of determining the Applicable
Margin or the Letter of Credit Percentage from time to time, (a) the first date
after the end of a fiscal quarter or fiscal year, as the case may be, of the
Borrower on which the Administrative Agent receives the financial statements as
of the end of that fiscal quarter or fiscal year required by Section 5.01(a) or
Section 5.01(b), as the case may be, (b) the 61st day after the end of any
fiscal quarter of the Borrower if the Administrative Agent has not received the
financial statements as of the end of that fiscal quarter required by Section
5.01(b) and (c) the 121st day after the end of any fiscal year of the Borrower
if the Administrative Agent has not received the financial statements required
by Section 5.01(a).

     "Dividend" means any cash dividend paid or declared by the board of
directors of the Borrower in respect of the Borrower's stock now or hereafter
outstanding.

     "Documentation Agent" means Bank of America National Trust and Savings
Association in its capacity as documentation agent for the Banks hereunder and
its successors in such capacity.

     "Domestic Business Day" means any day except a Saturday, Sunday or other
day on which commercial banks in Houston or New York City are authorized by law
to close.

     "Domestic Lending Office" means, as to each Bank, including the Issuing
Bank, its office, branch or Affiliate located at its address set forth in its
Administrative Questionnaire (or identified in its Administrative Questionnaire
as its Domestic Lending Office) or such other office, branch or Affiliate as
such Bank may from time to time specify to the Administrative Agent and the
Borrower as its Domestic Lending Office.
 
     "Drawing" means any drawing under a Letter of Credit.

                                       6
<PAGE>
 
     "EBITDA" means, for any period with respect to any Person, the sum of (a)
Consolidated Net Income or Loss of that Person for such period, minus (b)
interest income of that Person and its Consolidated Subsidiaries for such
period, plus (c) Consolidated Interest Expense of that Person for such period,
plus (d) depreciation, amortization and provisions for deferred taxes of that
Person and its Consolidated Subsidiaries for such period, and plus or minus (e)
any Non-Operating Special Items.

     "EBITDA Adjustment" means, for any fiscal quarter in which the Borrower,
LCR, Equistar, Methanol or any Other Equity Person or any of their respective
Consolidated Subsidiaries shall incur downtime at or with respect to any plant
or manufacturing or processing unit (as determined by the Borrower in its sole
discretion), an amount equal to the lesser of (i) the estimated amount by which
the combined EBITDA of all such Persons is impacted by such downtime or (ii)
$20,000,000, which amount may be included in the calculation of Global EBITDA
for that fiscal quarter; provided, that such adjustment of up to $20,000,000 for
                         --------                                               
all such Persons may only be made for one fiscal quarter during the term of this
Agreement.

     "Effective Date" means December 1, 1997, on satisfaction of the conditions
set forth in clauses (a) and (b) of Section 3.01.

     "Environmental Laws" means federal, state or local laws, rules or
regulations, including any administrative order, permit or approval pertaining
to health, safety or the environment in effect in the applicable jurisdiction at
the time in question, including the Clean Air Act, as amended, the Comprehensive
Environmental Response, Compensation and Liability Act, as amended ("CERCLA"),
                                                                     ------   
the Federal Water Pollution Control Act, as amended, the Occupational Safety and
Health Act, as amended, the Resource Conservation and Recovery Act, as amended,
the Safe Drinking Water Act, as amended, the Toxic Substances Control Act, as
amended, the Superfund Amendment and Reauthorization Act of 1986, as amended,
the Hazardous Materials Transportation Act, as amended, comparable state and
local laws, and other environmental conservation and protection laws.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

     "Equistar" means Equistar Chemicals, LP, a Delaware limited partnership,
the general partners of which on the date hereof are Lyondell Equistar G.P. and
Millennium Equistar GP and the limited partners of which on the date hereof are
Lyondell Equistar LP and Millennium Equistar LP, and its successors.

     "Equistar Debt" means the Debt of Lyondell Equistar LP evidenced by its
promissory note dated December 1, 1997 in the principal face amount of
$345,000,000 payable to Equistar on the terms provided for therein.

                                       7
<PAGE>
 
     "Equistar Partnership Agreement" means the limited partnership agreement of
Equistar dated October 10, 1997, as amended from time to time, subject, however,
to Section 5.08.
 
     "Euro-Dollar Business Day" means any Domestic Business Day on which
commercial banks are open for international business (including dealings in
dollar deposits) in London.
 
     "Euro-Dollar Committed Loan" means a Committed Loan to be made by a Bank as
a Euro-Dollar Committed Loan in accordance with the applicable Notice of
Committed Borrowing.

     "Euro-Dollar Competitive Loan" means a Competitive Loan to be made by a
Bank as a Euro-Dollar Competitive Loan in accordance with the applicable
Competitive Bid.

     "Euro-Dollar Lending Office" means, as to each Bank, its office, branch or
Affiliate located at its address set forth in its Administrative Questionnaire
(or identified in its Administrative Questionnaire as its Euro-Dollar Lending
Office) or such other office, branch or Affiliate of such Bank as it may from
time to time specify to the Administrative Agent and the Borrower as its Euro-
Dollar Lending Office.

     "Euro-Dollar Margin" has the meaning set forth in Section 2.07(b).

     "Euro-Dollar Rate" has the meaning set forth in Section 2.07(b).
 
     "Euro-Dollar Reserve Percentage" means with respect to any Bank for any day
that percentage (expressed as a decimal) which is in effect on such day as
prescribed by the Board of Governors of the Federal Reserve System (or any
successor) for determining the reserve requirement (including without limitation
any basic, supplemental or emergency reserves) imposed on such Bank in respect
of "Euro-currency liabilities" (or in respect of any other category of
liabilities which includes deposits by reference to which the interest rate on
Euro-Dollar Committed Loans is determined or in respect of any category of
extensions of credit or other assets which includes loans by a non-United States
office of such Bank to United States residents).

     "Event of Default" has the meaning set forth in Section 6.01.

     "Facility Fee" has the meaning specified in Section 2.16(a).

     "Federal Funds Rate" means, for any day, the rate per annum (rounded
upwards, if necessary, to the nearest 1/1OOth of 1 percent) equal to the
weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers on such
day, as published by the Federal 

                                       8
<PAGE>
 
Reserve Bank of Dallas on the Domestic Business Day next succeeding such day;
provided, however, that (i) if such day is not a Domestic Business Day, the
- --------  -------
Federal Funds Rate for such day shall be such rate on such transactions on the
next preceding Domestic Business Day as so published on the next succeeding
Domestic Business Day, and (ii) if no such rate is so published on such next
succeeding Domestic Business Day, the Federal Funds Rate for such day shall be
the average rate quoted to Texas Commerce Bank National Association on such day
for such transactions as determined by the Administrative Agent.

     "Global Debt" means the sum of (a) the Borrower's Consolidated Debt, plus
(b) the amount equal to the Ownership Percentage in LCR of LCR's Consolidated
Debt, plus (c) the amount equal to the Ownership Percentage in Equistar of
Equistar's Consolidated Debt, plus (d) the amount equal to the Ownership
Percentage in Methanol of Methanol's Consolidated Debt, plus (e) the amount
equal to the Ownership Percentage in each Other Equity Person of such Other
Equity Person's Consolidated Debt; provided, however, Global Debt shall not
include any Debt of LCR, Equistar, Methanol or any Other Equity Person owing to
the Borrower.

     "Global EBITDA" means (a) the Borrower's EBITDA, plus (b) the amount equal
to the Ownership Percentage in LCR of LCR's EBITDA, plus (c) the amount equal to
the Ownership Percentage in Equistar of Equistar's EBITDA, plus (d) the amount
equal to the Ownership Interest in Methanol of Methanol's EBITDA, plus (e) the
amount equal to the Ownership Percentage in each Other Equity Person of such
Other Equity Person's EBITDA, plus (e) any EBITDA Adjustment.

     "Guarantee"means, in respect of any Person, for that Person to guarantee or
act, directly or indirectly, as a surety for any Debt of any other Person and,
without limiting the generality of the foregoing, to (i) incur or assume any
such Debt, direct or indirect, contingent or otherwise, (ii) purchase or pay (or
advance or supply funds for the purchase or payment of) such Debt (whether
arising by virtue of partnership arrangements, by binding agreement to keep-
well, to purchase assets, goods, securities or services, to take-or-pay or to
maintain financial statement conditions or otherwise) or (iii) assure in any
other manner the obligee of such Debt of the payment thereof or to protect such
obligee against loss in respect thereof (in whole or in part); provided,
                                                               -------- 
however, in no event shall the term "Guarantee"mean to endorse for collection or
- -------                                                                         
deposit in the ordinary course of business.

     "Hazardous Materials" means any pollutant, contaminant, solid waste,
asbestos, petroleum product, crude oil or a fraction thereof, any toxic or
hazardous substance, material or waste, any flammable, explosive or radioactive
material  or any other material or substance not mentioned above which is
regulated under any Environmental Law.

                                       9
<PAGE>
 
     "Highest Lawful Rate" has the meaning set forth in Section 2.18.

     "Interest Expense" means, for any period and for any Person, without
duplication, the total interest expense of such Person as reflected on an income
statement of such Person for such period.

     "Interest Period" means: (1) with respect to each Euro-Dollar Committed
Borrowing, the period commencing on the date of such Committed Borrowing and
ending one through seven days (subject to market availability), or one, two,
three or six months thereafter, as the Borrower may elect in the applicable
Notice of Committed Borrowing or Notice of Conversion; provided, however, that:
                                                       --------  -------       

          (a)  any Interest Period which would otherwise end on a day which is
     not a Euro-Dollar Business Day shall be extended to the next succeeding
     Euro-Dollar Business Day, unless such Euro-Dollar Business Day falls in
     another calendar month, in which case such Interest Period shall end on the
     next preceding Euro-Dollar Business Day;

          (b)  any Interest Period which begins on the last Euro-Dollar Business
     Day of a calendar month (or on a day for which there is no numerically
     corresponding day in the calendar month at the end of such Interest Period)
     shall, subject to clause (c) immediately below, end on the last Euro-Dollar
     Business Day of a calendar month; and

          (c)  any Interest Period applicable to any Euro-Dollar Committed Loan
     of any Bank which begins before the Termination Date and would otherwise
     end after the Termination Date shall end on the Termination Date;

     (2)  with respect to each Base Rate Borrowing, the period commencing on the
date of such Committed Borrowing and ending 90 days thereafter; provided,
                                                                -------- 
however, that:
- -------       

          (a)  any Interest Period (other than an Interest Period determined
     pursuant to clause (b) immediately below) which would otherwise end on a
     day which is not a Domestic Business Day shall be extended to the next
     succeeding Domestic Business Day; and

          (b)  any Interest Period applicable to any Base Rate Loan of any Bank
     which begins before the Termination Date and would otherwise end after the
     Termination Date shall end on the Termination Date; and

                                      10
<PAGE>
 
     (3)  with respect to each Competitive Borrowing, the period commencing on
the date of such Competitive Borrowing and ending on such date as the Borrower
may elect in the applicable Competitive Bid Request, provided, however, that:
                                                     --------  -------       

          (a)  any Interest Period (other than an Interest Period determined
     pursuant to clause (c) immediately below) applicable to a Alternative
     Competitive Loan which would otherwise end on a day which is not a Domestic
     Business Day shall be extended to the next succeeding Domestic Business
     Day;

          (b)  any Interest Period (other than an Interest Period determined
     pursuant to clause (c) immediately below) applicable to a Euro-Dollar
     Competitive Loan which would otherwise end on a day which is not a Euro-
     Dollar Business Day shall be extended to the next succeeding Euro-Dollar
     Business Day unless such Euro-Dollar Business Day falls in another calendar
     month, in which case such Interest Period shall end on the next preceding
     Euro-Dollar Business Day; and

          (c)  any Interest Period applicable to any Competitive Borrowing which
     begins before the Termination Date and would otherwise end after the
     Termination Date shall end on the Termination Date.

     "Issuing Bank" means Texas Commerce Bank National Association or such other
Bank as the Borrower may have requested and which has consented to serve as
Issuing Bank that issues a Letter of Credit.

     "Joint Proxy Statement" shall mean the Joint Proxy Statement filed by the
Borrower and Millennium with the Securities and Exchange Commission on October
17, 1997.

     "Joint Venture" shall mean the combination of certain of the Borrower's and
Millennium's respective petrochemicals businesses to form a joint venture, which
will be organized as a Delaware limited partnership named Equistar Chemicals, LP
and headquartered in Houston, Texas, all on terms and in a manner not materially
inconsistent with the Master Transaction Agreement, the Asset Contribution
Agreements, the Limited Partnership Agreement and the description thereof in the
Joint Proxy Statement.

     "LCR" means LYONDELL-CITGO Refining Company Ltd., a Texas limited liability
company, and its successors.

     "LCR Regulations" means the amended and restated limited liability company
regulations of LCR dated as of July 1, 1993, as further amended to the date
hereof and as hereafter amended from time to time, subject, however, to Section
5.07.

                                      11
<PAGE>
 
     "Letter of Credit" has the meaning set forth in Section 2.03(a).

     "Letter of Credit Application" has the meaning set forth in Section
2.03(a).

     "Letter of Credit Fee" has the meaning set forth in Section 2.03(n).

     "Letter of Credit Limit" means $75,000,000.
 
     "Letter of Credit Outstandings" means, at any time, the sum of (a) the
aggregate Stated Amount of all outstanding Letters of Credit and (b) the amount
of all Unpaid Drawings in respect of all Letters of Credit.

     "Letter of Credit Percentage" means (a) 0.75% for the period from the date
of this Agreement until the first Determination Date after the date of this
Agreement and (b) for any subsequent period from and including any Determination
Date, beginning with the first Determination Date after the date of this
Agreement, (i) 0.75% if the Applicable Percentage Ratio is less than or equal to
1.0 to 1.0 and (ii) 1.00% if the Applicable Percentage Ratio is greater than 1.0
to 1.0.

     "Letter of Credit Request" has the meaning set forth in Section 2.03(a).

     "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset.
For the purposes of this Agreement, any Person or any Subsidiary of that Person
shall be deemed to own subject to a Lien any asset which it has acquired or
holds subject to the interest of a vendor or lessor under any conditional sale
agreement, capital lease or other title retention agreement relating to such
asset.

     "Loan" means a Committed Loan or a Competitive Loan and "Loans" means
Committed Loans or Competitive Loans or any combination of the foregoing.

     "Loan Documents" means this Agreement (including all Exhibits), the Notes
and the Letter of Credit Applications.

     "LRC" means Lyondell Refining Company, a Delaware corporation and a wholly-
owned Subsidiary of the Borrower, and its successors (including any entity that
assumes LRC's obligations under the LCR Regulations).

     "Lyondell Equistar GP" means Lyondell Petrochemical G.P. Inc., a Delaware
corporation and wholly-owned Subsidiary of the Borrower, and its successors
(including any entity that assumes Lyondell Equistar GP's obligations under the
Equistar Partnership Agreement).

                                      12
<PAGE>
 
     "Lyondell Equistar LP" means Lyondell Petrochemical L.P. Inc., a Delaware
corporation and wholly-owned Subsidiary of the Borrower, and its successors
(including any entity that assumes Lyondell Equistar LP's obligations under the
Equistar Partnership Agreement).

     "Lyondell Equistar Partners" means Lyondell Equistar GP and Lyondell
Equistar LP.

     "Lyondell Methanol GP" means Lyondell General Methanol Company, a Delaware
corporation and wholly-owned Subsidiary of the Borrower, and its successors
(including any entity that assumes Lyondell Methanol GP's obligations under the
Methanol Partnership Agreement).

     "Lyondell Methanol LP" means Lyondell Limited Methanol Company, a Delaware
corporation and wholly-owned Subsidiary of the Borrower, and its successors
(including any entity that assumes Lyondell Methanol LP's obligations under the
Methanol Partnership Agreement).

     "Lyondell Methanol Partners" means Lyondell Methanol GP and Lyondell
Methanol LP.

     "Material Adverse Effect" means relative to the occurrence of any event and
after taking into account existing or reasonably anticipated insurance coverage
and indemnification rights with respect to such occurrence, a material adverse
effect (i) on the business, operations, affairs, assets, condition (financial or
otherwise) or results of operations of the Borrower and its Consolidated
Subsidiaries, considered as a whole, or (ii) on the ability of the Borrower to
perform its obligations hereunder and under the Notes.

     "Material Plan" means a Plan or Plans having aggregate Unfunded Vested
Liabilities in excess of $25,000,000.

     "MCNIC" means MCN Investment Corporation, a Michigan corporation, and its
successors and assigns.

     "MCNIC Methanol GP" means MCNIC General Methanol Company, a Michigan
corporation and a wholly-owned Subsidiary of MCNIC, and its successors
(including any entity that assumes MCNIC Methanol GP's obligations under the
Methanol Partnership Agreement).

     "MCNIC Methanol LP" means MCNIC General Methanol Company, a Michigan
corporation and a wholly-owned Subsidiary of MCNIC, and its successors
(including 

                                      13
<PAGE>
 
any entity that assumes MCNIC Methanol LP's obligations under the Methanol
Partnership Agreement).

     "Methanol Partnership Agreement" means the limited partnership agreement of
Methanol dated December 12, 1996, as amended from time to time.

     "Methanol" means Lyondell Methanol Company, L.P., a Texas limited
partnership, the general partners of which on the date hereof are Lyondell
Methanol GP and MCNIC Methanol GP and the limited partners of which on the date
hereof are Lyondell Methanol LP and MCNIC Methanol LP, and its successors.

     "Millennium" means Millennium Chemicals Inc., a Delaware corporation, and
its successors and assigns.

     "Millennium Equistar GP" means Millennium Petrochemicals GP LLC, a Delaware
limited liability company and indirect, wholly-owned Subsidiary of Millennium,
and its successors (including any entity that assumes Millennium Equistar GP's
obligations under the Equistar Partnership Agreement).

     "Millennium Equistar LP" means Millennium Petrochemicals LP LLC, a Delaware
limited liability company and an indirect, wholly-owned Subsidiary of
Millennium, and its successors (including any entity that assumes Millennium
Equistar LP's obligations under the Equistar Partnership Agreement).

     "Millennium Equistar Partners" means Millennium Equistar GP and Millennium
Equistar LP.

     "Net Interest" means the sum of (a) interest on Replacement Debt, minus (b)
any interest earned on the proceeds from Replacement Debt, plus (c) interest on
Replaced Debt.

     "Non-Operating Special Item" means (a) any item resulting from a change in
one or more accounting principles, (b) any extraordinary or non-recurring item
or (c) any material operating item which is unusual in nature or infrequent in
occurrence; provided, however, that with respect to the designation of any item
            --------  -------                                                  
(other than non-cash items) described in clause (c), the Borrower must obtain
the agreement of the Administrative Agent and the Documentation Agent that such
designation is appropriate, which agreement shall not be unreasonably withheld.

     "Notes" means Committed Notes of the Borrower, substantially in the form of
Exhibit 2.05, and Competitive Notes of the Borrower, substantially in the form
of Exhibit 2.10(d), evidencing the obligation of the Borrower to repay the Loans
made 

                                      14
<PAGE>
 
thereunder, and "Note" means any one of such Committed Notes or Competitive
Notes.

     "Notice of Committed Borrowing" means a Notice of Committed Borrowing made
pursuant to Section 2.02 in the form of Exhibit 2.02.

     "Notice of Competitive Bid Request" means a Notice of Competitive Bid
Request made pursuant to Section 2.10(a) in the form of Exhibit 2.10(b).

     "Notice of Conversion" has the meaning set forth in Section 2.08.

     "Obligations" means all the obligations of the Borrower now or hereafter
existing under the Loan Documents, whether for principal, Unpaid Drawings,
interest, fees, expenses, indemnification or otherwise.

     "Other Equity Person" means any Person other than LCR, Equistar and
Methanol in which the Borrower owns investments which are accounted for on the
equity basis of accounting by the Borrower.

     "Owner" has the meaning assigned to that term in the LCR Regulations.

     "Ownership Percentage" means, at any time, the percentage represented by
the ratio of the equity interests owned, directly or indirectly, by the Borrower
in any Person to all equity interests of that Person issued and outstanding, at
that time.

     "Parent" means, with respect to any Bank, any Person controlling such Bank.

     "Participant" has the meaning set forth in Section 9.07(b).

     "PBGC" means the Pension Benefit Guaranty Corporation or any entity
succeeding to any or all of its functions under ERISA.

     "Person" means an individual, a corporation, a limited liability company, a
limited or general partnership, an association, a trust or any other entity or
organization, including a government or political subdivision or an agency or
instrumentality thereof.

     "Plan" means at any time an employee pension benefit plan which is covered
by Title IV of ERISA or subject to the minimum funding standards under Section
412 of the Code and is either (i) maintained by a member of the Controlled Group
for employees of a member of the Controlled Group or (ii) maintained pursuant to
a collective bargaining agreement or any other arrangement under which more than
one employer makes contributions and to which a member of the Controlled Group
is then 

                                      15
<PAGE>
 
making or accruing an obligation to make contributions or has within the
preceding five plan years made contributions.

     "Prime Rate" means the prime rate of interest most recently determined by
Texas Commerce Bank National Association and thereafter entered in the minutes
of its Loan and Discount Committee, automatically fluctuating upward and
downward with and at the time specified in each such determination, without
notice to the Borrower or any other Person, which prime rate may not necessarily
represent the lowest or best rate actually charged to a customer.

     "Reference Bank" means Texas Commerce Bank National Association.

     "Refunding Borrowing" means a Committed Borrowing which, after application
of the proceeds thereof, results in no net increase in the outstanding principal
amount of Loans made by any Bank.

     "Regulation G" shall mean Regulation G of the Board of Governors of the
Federal Reserve System, as in effect from time to time (including any successor
provision thereto).

     "Regulation U" means Regulation U of the Board of Governors of the Federal
Reserve System, as in effect from time to time (including any successor
provision thereto).

     "Regulation X" shall mean Regulation X of the Board of Governors of the
Federal Reserve System, as in effect from time to time (including any successor
provision thereto).

     "Release" means any spilling, leaking, pumping, pouring, emitting,
emptying, discharging, injecting, escaping, leaching, dumping or disposing into
the environment (including the abandonment or discarding of barrels, containers
and other closed receptacles).

     "Required Banks" means, at any date, Banks holding at least 66-2/3 percent
of the then aggregate unpaid principal amount of the Committed Loans and
participations in the Letter of Credit Outstandings, or, if no such principal
amount is then outstanding and no Letter of Credit Outstandings exist, then
Banks having at least 66-2/3 percent of the Commitments; if no such principal
amount is then outstanding and no Letter of Credit Outstandings exist and all
Commitments have been terminated, then Banks holding at least 66-2/3 percent of
the then aggregate unpaid principal amount of the Competitive Loans.

                                      16
<PAGE>
 
     "Requirements of Environmental Laws" means, as to any Person, the
requirements of any Environmental Laws applicable to such Person or the
condition or operation of such Person's business or its properties, both real
and personal.

     "Restricted Property" means:

          (a)  any plant (including fixtures and equipment) for the refining of
     petroleum or the production of petrochemicals owned by the Borrower, or any
     of its Subsidiaries, except (i) related facilities which in the opinion of
     the Board of Directors of the Borrower are transportation or marketing
     facilities and (ii) any plant for the refining of petroleum or the
     production of petrochemicals which in the reasonable opinion of the Board
     of Directors of the Borrower is not a principal plant of the Borrower and
     its Subsidiaries;

          (b)  any inventory of the Borrower or a Subsidiary;

          (c)  any trade accounts receivable of the Borrower or any of its
     Subsidiaries; and

          (d)  any shares of capital stock or indebtedness of a Restricted
     Subsidiary owned by the Borrower or any of its Subsidiaries (excluding any
     of such shares that constitute "margin stock" as defined in Regulation U).

     "Restricted Subsidiary" shall mean any Subsidiary of the Borrower which
owns any Restricted Property.

     "Stated Amount" means, with respect to each Letter of Credit, at any time,
the maximum amount then available to be drawn thereunder, assuming satisfaction
of all conditions to such drawing.

     "Stub Period Global EBITDA" means the sum of (a) the Borrower's EBITDA,
plus (b) an amount equal to the Ownership Percentage in LCR of LCR's EBITDA.

     "Subsidiary" means, with respect to any Person, any corporation or other
entity of which securities or other ownership interests having ordinary voting
power to elect a majority of the board of directors or other Persons performing
similar functions (whether or not any other class of securities has or might
have voting power by reason of the happening of a contingency) are at the time
owned or controlled directly or indirectly by that Person.  Without in any other
way limiting the foregoing, none of LCR, Equistar, Methanol or any Other Equity
Person shall be deemed to be a Subsidiary of the Borrower.

                                      17
<PAGE>
 
     "Termination Date" means for any Bank the earlier of (a) the later of (i)
the 364th day after the date of this Agreement and (ii) such later date as may
be accepted by such Bank from time to time pursuant to Section 2.01(b) and (b)
any date on which the Loans become due and payable in full, whether by
acceleration or otherwise in accordance with this Agreement.

     "'34 Act Report" has the meaning set forth in Section 4.01(f).

     "Total Capitalization" means at any time, with respect to the Borrower and
its Subsidiaries, the sum of (a) the Consolidated Debt of the Borrower and (b)
the shareholder's equity of the Borrower and its Subsidiaries determined on a
consolidated basis.

     "Unfunded Vested Liabilities" means, with respect to any Plan at any time,
the amount (if any) by which (i) the present value of all vested nonforfeitable
benefits under such Plan exceeds (ii) the fair market value of all Plan assets
allocable to such benefits, all determined as of the then most recent valuation
date for such Plan, but only to the extent that such excess represents a
potential liability of a member of the Controlled Group to the PBGC or the Plan
under Title IV of ERISA.

     "Unpaid Drawing" has the meaning specified in Section 2.03(g).

     SECTION 1.02. Accounting Terms and Determinations.  Unless otherwise
                   -----------------------------------                   
specified herein, with respect to any Person, all accounting terms used herein
shall be interpreted, all accounting determinations hereunder shall be made, and
all financial statements required to be delivered hereunder shall be prepared in
accordance with generally accepted accounting principles as in effect from time
to time, applied on a basis consistent (except for changes concurred in by such
Person's independent public accountants) with the most recent audited
consolidated financial statements of such Person and its Consolidated
Subsidiaries delivered to the Administrative Agent.

     SECTION 1.03.  Types of Loans and Borrowings. The term "Borrowing" denotes 
                    -----------------------------                      
the aggregation of Loans of one or more Banks to be made to the Borrower or
converted or continued pursuant to Article II on a single date and for a single
Interest Period. Loans and Borrowings are classified for purposes of this
Agreement by reference to the Loans comprising such Borrowings and the pricing
of such Loans (e.g., a "Euro-Dollar Committed Borrowing" is a Borrowing
comprised of Committed Euro-Dollar Loans).

     SECTION 1.04.  Terms Generally.  When used in this Agreement, (i) the words
                    ---------------                                       
"herein," "hereof," "hereto" and "hereunder" and words of similar import shall
refer to this Agreement as a whole unless otherwise specified, (ii) the words
"Article," "Section," "Exhibit" and "Schedule" shall refer to Articles and
Sections of, and 

                                      18
<PAGE>
 
Exhibits and Schedules to, this Agreement unless otherwise specified. For
purposes of Section 2.18, the term "Bank" shall also include the Issuing Bank
and (iii) the word "including" (and with correlative meaning "include") means
including, without limiting the generality of any description preceding such
terms.

                                  ARTICLE II

                                  THE CREDITS

      SECTION 2.01. Commitments to Lend.  (a)  Each Bank severally agrees, on
                    -------------------                                      
the terms and conditions set forth in this Agreement, from time to time to lend
to the Borrower pursuant to this Section 2.01 in amounts such that the aggregate
outstanding principal amount of Committed Loans by such Bank, plus its
Commitment Percentage of the Letter of Credit Outstandings at any one time
outstanding shall not exceed the amount of its Commitment.  Without in any way
limiting the foregoing, at no time will the sum of (A) the Letter of Credit
Outstandings, plus (B) the aggregate outstanding principal amount of the
Committed Loans, plus (c) the aggregate outstanding principal amount of the
Competitive Loans exceed the Committed Amount. Each Committed Borrowing under
this Section 2.01 shall be in an aggregate principal amount of $5,000,000 or any
larger multiple of $1,000,000 (except that any such Committed Borrowing may be
in an aggregate amount such that, immediately after giving effect to such
Borrowing, the sum of (A) the Letter of Credit Outstandings, plus (B) the
aggregate outstanding principal amount of the Committed  Loans, plus (C) the
aggregate outstanding principal amount of the Competitive Loans will equal the
Committed Amount) and shall be made by the several Banks ratably in proportion
to their respective Commitments. Within the foregoing limits, prior to the
Termination Date the Borrower may borrow under this Section 2.01, repay, or to
the extent permitted by Section 2.13, prepay Committed Loans and re-borrow at
any time.

     (b)  At any time after the 61st day prior to the then current Termination
Date, the Borrower may request that the Termination Date be extended, effective
on the then current Termination Date, to the date which is the 364th day after
the then current Termination Date and the Banks may, at their option, accept or
reject such request.  To request an extension, the Borrower shall notify the
Administrative Agent of the Borrower's request to extend the Termination Date,
and the Administrative Agent shall promptly notify the Banks of each such
request.  Each Bank shall notify the Administrative Agent in writing within 30
days after receipt of such request whether it consents to such extension;
provided that no Bank shall be required to give notice of consent prior to 30
- --------                                                                     
days prior to the then current Termination Date (the later of such days shall be
referred to as the "Extension Response Date").  If any Bank shall fail to give
such notice to the Administrative Agent by the Extension Response Date, such
Bank shall be deemed to have rejected the requested extension.  If all the Banks
consent to the requested extension by the Extension Response Date, the
Termination 

                                      19
<PAGE>
 
Date shall be automatically extended to the date which is the 364th day after
the then current Termination Date. If fewer than all the Banks so consent (each
Bank rejecting the requested extension being referred to as a "Terminating
                                                               -----------
Bank"), the Borrower shall within five days after the Extension Response Date 
- ----
notify the Administrative Agent (which shall promptly notify each Bank) whether
the Borrower elects to withdraw its request for an extension of the Termination
Date or to extend the Termination Date for all the Banks that have consented to
such extension. If the Borrower elects to so extend the Termination Date as to
fewer than all the Banks, the Administrative Agent shall promptly notify the 
non-Terminating Banks of the Borrower's decision, and each Bank which is not a
Terminating Bank shall have the right, but not the obligation, to elect to
increase its Commitment by an amount not to exceed the aggregate amount of the
Commitments of the Terminating Banks, which election shall be made by notice
from each such non-Terminating Bank to the Administrative Agent and the Borrower
given not later than five Business Days after the date notified by the
Administrative Agent, specifying the amount of such proposed increase in such
non-Terminating Bank's Commitment.

     (c)  If the aggregate amount of the proposed increases in the respective
Commitments of all such non-Terminating Banks making such an election is in
excess of the aggregate Commitments of the Terminating Banks, (i) the respective
Commitments of the Terminating Banks shall be allocated pro rata among such non-
                                                        --------               
Terminating Banks based on the respective amounts of the proposed increases to
their Commitments elected by such non-Terminating Banks and (ii) the respective
Commitments of such non-Terminating Banks shall be increased by the respective
amounts allocated pursuant to clause (i) above so that, after giving effect to
such Commitment terminations and increases, the aggregate amount of the
Commitments of the non-Terminating Banks will be the same as the Committed
Amount prior to the Extension Response Date. If the aggregate amount of the
proposed increases to the respective Commitments of all non-Terminating Banks
making such an election equals the aggregate Commitments of the Terminating
Banks, the respective Commitments of such non-Terminating Banks shall be
increased by the respective amounts of their proposed increases, so that after
giving effect to such Commitment terminations and increases, the aggregate
amount of the Commitments non-Terminating Banks will be the same as  the
Committed Amount prior to the Extension Response Date.  If the aggregate amount
of the proposed increases to the respective Commitments of all non-Terminating
Banks making such an election is less than the aggregate Commitments of the
Terminating Banks, (i) the respective Commitments of such non-Terminating Banks
shall be increased by the respective amounts of their proposed increases and
(ii) the Borrower shall have the right to add one or more banks and other
financial institutions as parties to this Agreement (in such capacity, each a
"Purchasing Bank") to replace such Terminating Banks, which Purchasing Banks
 ---------------                                                            
shall have aggregate Commitments not greater than those of the Terminating
Banks, less the amounts thereof, if any, assumed by the non-Terminating Banks,
as described 

                                      20
<PAGE>
 
immediately above. The transfer of Commitments and outstanding Loans from
Terminating Banks to Purchasing Banks and non-Terminating Banks shall take place
on the effective date of, and pursuant to the execution, delivery, acceptance
and recording of, instruments of assignment and acceptance in accordance with
the procedures set forth in Section 9.07(c).

     (d)  To the extent that any Terminating Bank does not transfer all its
Commitment and outstanding Loans to a Purchasing Bank or a non-Terminating Bank
pursuant to subsection (c) immediately above, on the Termination Date applicable
to each such Terminating Bank, the Committed Amount shall be reduced by the
amount of the Commitment of each such Terminating Bank and, concurrently with
such reduction in the Committed Amount, the Borrower shall pay the outstanding
principal amount of the Loans of each such Terminating Bank, together with all
accrued and unpaid interest thereon, each such Terminating Bank's ratable share
of all accrued and unpaid Facility Fees and all other amounts then owing to such
Terminating Bank hereunder, in each case, to the extent not transferred pursuant
to subsection (c) immediately above.

     (e)  Each Terminating Bank's Commitment shall expire no later than its
Termination Date and each Terminating Bank shall have no further rights or
obligations hereunder following (i) the transfer of such Terminating Bank's
Commitment and outstanding Loans from such Terminating Bank to Purchasing Banks
or non-Terminating Banks and (ii) the payment in full of all amounts due and
owing to such Terminating Bank on its Termination Date.

     (f)  Notwithstanding any other provision of this Section 2.01, the
Administrative Agent and the Borrower shall have the right, without consent of
the Required Banks, to amend the procedures for the extension of the Termination
Date set forth in this Section 2.01 to the extent the Administrative Agent shall
determine such amendment to be necessary to ensure that the Banks will not be
required to maintain capital against their Commitments under applicable rules,
regulations and interpretations of bank regulatory authorities; provided, that
                                                                --------      
no such amendment shall permit the extension of any Bank's Commitment without
the consent of such Bank.

     SECTION 2.02.  Notice of Committed Borrowings. The Borrower shall give
                    ------------------------------                         
the Administrative Agent notice (a "Notice of Committed Borrowing")
substantially in the form of Exhibit 2.02  not later than 10:00 a.m. (Houston
time) on (i) the date of each Base Rate Borrowing or each Euro-Dollar Committed
Borrowing with an Interest Period of seven days or less and (ii) the third Euro-
Dollar Business Day before each Euro-Dollar Committed Borrowing with an Interest
Period greater than seven days, specifying:

                                      21
<PAGE>
 
          (a)  the date of such Committed Borrowing, which shall be a Domestic
     Business Day in the case of a Base Rate Borrowing or a Euro-Dollar Business
     Day in the case of a Euro-Dollar Committed Borrowing;

          (b)  the aggregate amount of such Committed Borrowing;

          (c)  whether the Loans comprising such Committed Borrowing are to be
     Base Rate Loans or Euro-Dollar Committed Loans;

          (d)  in the case of a Euro-Dollar Committed Borrowing, the duration of
     the Interest Period applicable thereto, subject to the provisions of the
     definition of Interest Period;

          (e)  the aggregate outstanding principal amount of Debt of the
     Borrower and its Subsidiaries incurred after the Effective Date and, if
     required, a calculation as of the date of such Notice of Committed
     Borrowing pursuant to Section 5.09(a);

          (f)  more than one Notice of Committed Borrowing may be given on any
     Domestic Business Day or any Euro-Dollar Business Day, as the case may be.

     SECTION 2.03.   Letters of Credit.
                     ----------------- 

     (a)  Subject to and upon the terms and conditions hereof and the execution
and delivery of a letter of credit application ("Letter of Credit Application"),
and a letter of credit request ("Letter of Credit Request") substantially in the
form of Exhibit 2.03(b) , the Issuing Bank agrees that it will, at any time and
from time to time on or after the Effective Date and prior to the Termination
Date, renew, extend and issue for the account of the Borrower (in support of its
obligations or the obligations of its Consolidated Subsidiaries) one or more
irrevocable standby letters of credit (each such letter of credit, a "Letter of
Credit"); provided, however, that the Issuing Bank shall not extend, renew or
          --------  -------                                                  
issue any Letter of Credit if at the time of such issuance, extension or renewal
and after giving effect thereto:

          (i)  the sum of the Letter of Credit Outstandings at such time, plus
     the aggregate principal amount of all Loans then outstanding or requested
     would exceed the Commitment Amount; or

          (ii) the Letter of Credit Outstandings at such time, would exceed the
     Letter of Credit Limit; or

                                      22
<PAGE>
 
          (iii) the expiry date or, in the case of any Letter of Credit
     containing an expiry date that is extendible at the option of the Issuing
     Bank, the initial expiry date of such Letter of Credit, is a date that is
     later than the Termination Date; or

          (iv)  such issuance, renewal or extension shall be prohibited by
     applicable law.

     (b)  The Issuing Bank shall neither renew nor permit the renewal of any
Letter of Credit if any of the conditions precedent to such renewal set forth in
Section 3.02 are not satisfied or, after giving effect to such renewal, the
expiry date of such Letter of Credit would be a date that is later than the
Termination Date.

     (c)  Whenever the Borrower requests that a Letter of Credit be issued or
renewed for its account or an existing expiry date be extended, it shall forward
an executed Letter of Credit Request and Letter of Credit Application to the
Issuing Bank (with copies to be sent to the Administrative Agent (if different
from the Issuing Bank)) (i) in the case of a Letter of Credit to be issued or
renewed at least four Domestic Business Days' prior to the proposed date of
issuance or renewal and (ii) in the case of the extension of the existing expiry
date of any Letter of Credit, at least five Domestic Business Days prior to the
date on which the Issuing Bank must notify the beneficiary thereof that the
Issuing Bank does not intend to extend such existing expiry date.  Each Letter
of Credit shall be denominated in U.S. dollars, shall expire no later than the
date specified in paragraph (a) above, shall not be in an amount greater than is
permitted under this Section 2.03 and shall be in such form as may be approved
from time to time by the Issuing Bank and the Borrower.

     (d)  The making of each Letter of Credit Request shall be deemed to be a
representation and warranty by the Borrower that such Letter of Credit may be
renewed, extended or issued in accordance with, and will not violate the
requirements of this Agreement.  Unless the Issuing Bank has received notice
from the Administrative Agent (if different from the Issuing Bank) before it
issues or renews the respective Letter of Credit or extends the existing expiry
date of a Letter of Credit that one or more of the conditions specified in
Article III are not then satisfied, or that the renewal, extension or issuance
of such Letter of Credit would violate any of the terms of this Agreement, then
the Issuing Bank may renew, extend or issue the requested Letter of Credit for
the account of the Borrower (in support of its obligations and the obligations
of its Consolidated Subsidiaries) in accordance with the Issuing Bank's usual
and customary practices.  Upon its issuance or renewal of any Letter of Credit
or the extension of the existing expiry date of any Letter of Credit, as the
case may be, the Issuing Bank shall promptly notify the Borrower, the
Administrative Agent and each Bank of such issuance, renewal or extension, which
notice shall be accompanied by a copy of the Letter of Credit actually issued or
renewed or a copy of any  

                                      23
<PAGE>
 
amendment extending the existing expiry date of any Letter of Credit, as the
case may be.

     (e)  Upon the renewal, extension or issuance by the Issuing Bank of each
Letter of Credit, the Issuing Bank shall be deemed to have sold and transferred
to each Bank, and each Bank shall be deemed irrevocably and unconditionally to
have purchased and received from the Issuing Bank, without recourse or warranty,
an undivided interest and participation, to the extent of such Bank's Commitment
Percentage in each such Letter of Credit (including extensions of the expiry
date thereof), each substitute letter of credit, each drawing made thereunder
and the Obligations of the Borrower under this Agreement and the other Loan
Documents with respect thereto and any security, if any, therefor.

     (f)  In determining whether to pay under any Letter of Credit, the Issuing
Bank shall have no obligation relative to the Banks other than to confirm that
any documents required to be delivered under such Letter of Credit appear to
have been delivered and that they appear to comply on their face with the
requirements of such Letter of Credit.

     (g)  Upon the receipt by the Issuing Bank of any documentation presented
for a drawing from a beneficiary under a Letter of Credit, the Issuing Bank
promptly will provide the Administrative Agent (if different from the Issuing
Bank), the Banks and the Borrower with telecopy notice thereof and the Issuing
Bank will promptly examine the documentation presented for such drawing in
accordance with its customary procedures for conformity to the requirements of
such Letter of Credit. The Borrower hereby agrees to reimburse the Issuing Bank
by making payment to the Administrative Agent in immediately available funds
(which payment may be made by application of the proceeds of Loans made to the
Borrower in accordance with this Agreement) for any payment so made by the
Issuing Bank under any Letter of Credit issued by it (each such amount so paid
until reimbursed by the Borrower, including by application of the proceeds of
Loans to the Borrower in accordance with this Agreement, an "Unpaid Drawing")
upon demand on or after the date of such payment, with interest on the amount so
paid by the Issuing Bank, to the extent not reimbursed prior to 2:00 p.m.
(Houston time) on the date of such payment, from and including the date paid to
but excluding the date reimbursement is made as provided above, at a rate per
annum equal to the lesser of (i) the sum of 2 percent, plus the Base Rate, or
(ii) the Highest Lawful Rate.

     (h)  In the event that the Issuing Bank makes any payment under any Letter
of Credit and the Borrower shall not have reimbursed such amount in full to the
Issuing Bank (including by any application of the proceeds of Loans) pursuant to
paragraph (g) above, the Issuing Bank shall promptly notify the Administrative
Agent (if different from the Issuing Bank) and the Administrative Agent, shall
promptly notify each Bank 

                                      24
<PAGE>
 
of such failure, and each Bank shall promptly and unconditionally pay the
Administrative Agent for the account of the Issuing Bank the amount of such
Bank's Commitment Percentage of such unreimbursed payment in dollars and in
funds immediately available in Houston. If the Administrative Agent so notifies,
prior to 11:00 a.m. (Houston time) on any Domestic Business Day, any Bank
required to fund a payment under a Letter of Credit, such Bank shall make
available to the Administrative Agent for the account of the Issuing Bank such
Bank's Commitment Percentage of the amount of such payment on such Domestic
Business Day in funds immediately available in Houston. If and to the extent
such Bank shall not have so made its Commitment Percentage of the amount of such
payment available to the Administrative Agent for the account of the Issuing
Bank, such Bank agrees to pay to the Administrative Agent for the account of the
Issuing Bank, forthwith on demand such amount, together with the interest
thereon, for each day from such date until the date such amount is paid to the
Administrative Agent for the account of the Issuing Bank at the Federal Funds
Rate. The failure of any Bank to make available to the Administrative Agent for
the account of the Issuing Bank, its Commitment Percentage of any payment under
any Letter of Credit shall not relieve any other Bank of its obligation
hereunder to make available to the Administrative Agent for the account of the
Issuing Bank its Commitment Percentage of any payment under any Letter of Credit
on the date required, as specified above, but no Bank shall be responsible for
the failure of any other Bank to make available to the Administrative Agent for
the account of the Issuing Bank such other Bank's Commitment Percentage of any
such payment.

     (i)  Whenever the Issuing Bank receives a payment of a reimbursement
obligation as to which the Administrative Agent has received for the account of
the Issuing Bank any payments from a Bank pursuant to paragraph (h) above, the
Issuing Bank shall pay to the Administrative Agent (if different from the
Issuing Bank) and the Administrative Agent shall promptly pay to each Bank which
has paid its Commitment Percentage thereof, in dollars and in same day funds, an
amount equal to such Bank's Commitment Percentage thereof together with any
interest on such reimbursement obligation allocable to such Bank's Commitment
Percentage paid by the Borrower to the Issuing Bank and received by the
Administrative Agent pursuant to paragraph (g) above.

     (j)  The obligations of the Banks to make payments to the Administrative
Agent for the account of the Issuing Bank with respect to Letters of Credit
shall be irrevocable and not subject to any qualification or exception
whatsoever (except for the gross negligence or willful misconduct of the Issuing
Bank) and shall be made in accordance with the terms and conditions of this
Agreement under all circumstances, including any of the following circumstances:

                                      25
<PAGE>
 
          (1)  any lack of validity or enforceability of this Agreement or any
     of the other Loan Documents;

          (2)  the existence of any claim, setoff, defense or other right which
     the Borrower may have at any time against a beneficiary named in a Letter
     of Credit, any transferee of Letter of Credit, any Agent, the Issuing Bank,
     any other Bank, or any other Person, whether in connection with this
     Agreement, any Letter of Credit, the transactions contemplated herein or
     any unrelated transactions;

          (3)  any draft, certificate or any other document presented under the
     Letter of Credit proving to be forged, fraudulent, invalid or insufficient
     in any respect or any statement therein being untrue or inaccurate in any
     respect;

          (4)  the surrender or impairment of any security for the performance
     or observance of any of the terms of any of the Loan Documents; or

          (5)  the occurrence of any Default or Event of Default.

     (k)  The Borrower also agrees with the Issuing Bank and the Banks that the
Issuing Bank shall not be responsible for, and the Borrower's reimbursement
obligations under paragraph (g) above are absolute and unconditional and shall
not be affected by any of the following (absent any gross negligence, willful
misconduct or violation of law on the part of any of the Issuing Bank, the
Agents and the other Banks): the validity or genuineness of documents or any
endorsements thereon, even though such documents shall in fact prove to be
invalid, fraudulent or forged, or any dispute between or among the Borrower and
the beneficiary of any letter of Credit or any other party to which such Letter
of Credit may be transferred or any claims whatsoever of the Borrower against
any beneficiary of such Letter of Credit or any such transferee or any other
matter or event similar to any of the foregoing or any setoff, counterclaim or
defense to payment which the Borrower may have.

     (l)  The Issuing Bank, its officers, directors, agents and employees, shall
not be liable for any error, omission, interruption or delay in transmission,
dispatch or delivery of any message or advice, however transmitted, in
connection with any Letter of Credit, except for errors, omissions,
interruptions or delays caused by the Issuing Bank's gross negligence or willful
misconduct or violation of law.  IT IS THE EXPRESS INTENTION OF THE PARTIES
HERETO THAT THE ISSUING BANK SHALL BE INDEMNIFIED AND HELD HARMLESS AGAINST ANY
AND ALL LOSSES, LIABILITIES, CLAIMS, DEFICIENCIES, JUDGMENTS OR REASONABLE
EXPENSES ARISING OUT OF OR RESULTING FROM THE ORDINARY NEGLIGENCE (WHETHER SOLE
OR CONTRIBUTORY) OF THE ISSUING BANK IN CONNECTION WITH ANY SUCH ERROR,
OMISSION, INTERRUPTION OR DELAY AS AFORESAID.  The Borrower agrees that 

                                      26
<PAGE>
 
any action taken or omitted by the Issuing Bank under or in connection with any
Letter of Credit or the related drafts or documents if done in accordance with
the standards of care specified in the Uniform Customs and Practice for
Documentary Credits, International Chamber of Commerce, as in effect from time
to time, and, to the extent not inconsistent therewith, the Uniform Commercial
Code of the State of Texas, shall not result in any liability of the Issuing
Bank to the Borrower.

     (m)  To the extent that any provision of any Letter of Credit Application
related to any Letter of Credit is inconsistent with the provisions of this
Agreement, the provisions of this Agreement shall control and no Letter of
Credit Application or any other document relating to any Letter of Credit shall
give the Agents or the Banks any additional rights than they would otherwise
have under this Agreement.

     (n)  The Borrower shall, on the date of issuance or any extension or
renewal of any Letter of Credit and at such other time or times as such charges
are customarily made by the Issuing Bank, pay an upfront fee (in each case, a
"Letter of Credit Fee") to the Administrative Agent in respect of each Letter of
Credit so issued in an amount equal to the Letter of Credit Percentage in effect
from time to time of the face amount of such Letter of Credit, as the case may
be, plus a fronting fee for the benefit of the Issuing Bank equal to 0.125%
(computed on an annualized basis), plus the Issuing Bank's issuance, amendment
and other administrative fees and charges customarily charged to its customers
similarly situated. Such Letter of Credit Fee (but not such customary issuance,
amendment fee or other administrative fees and charges, or the fronting fee, all
of which shall be solely for the account of the Issuing Bank) shall be for the
accounts of the Banks in accordance with their respective Commitment
Percentages. Such upfront fees and fronting fees shall be based on a 360-day
year, except that if the use of a 360-day year would cause any such fees
constituting interest (within the meaning of all applicable laws) to exceed the
Highest Lawful Rate, then such interest and fees will be computed on the basis
of a year of 365 days (or 366 in a leap year).

     SECTION 2.04.   Notice to Banks; Funding of Committed Loans.
                     ------------------------------------------- 

     (a)  Upon receipt of a Notice of Committed Borrowing, the Administrative
Agent shall promptly notify each Bank of the contents thereof and of such Bank's
share (if any) of such Committed Borrowing and such Notice of Committed
Borrowing shall not thereafter be revocable by the Borrower.

     (b)  Not later than 12:00 noon (Houston time) on the date of each Committed
Borrowing, each Bank participating therein shall (except as provided in
subsection (c) of this Section) make available its share of such Committed
Borrowing, in funds immediately available in Houston, to the Administrative
Agent at its address specified in or pursuant to Section 9.01.  Unless the
Administrative Agent determines that any 

                                      27
<PAGE>
 
applicable condition specified in Article III has not been satisfied, the
Administrative Agent will make the funds so received from the Banks available to
the Borrower at the Administrative Agent's aforesaid address.

     (c)  If any Bank makes a new Committed Loan hereunder on a day on which the
Borrower is to repay all or any part of an outstanding Committed Loan from such
Bank, such Bank shall apply the proceeds of its new Committed Loan to make such
repayment and only an amount equal to the difference (if any) between the amount
being borrowed and the principal amount being repaid shall be made available by
such Bank to the Administrative Agent as provided in subsection (b) immediately
above, or remitted by the Borrower to the Administrative Agent as provided in
Section 2.14, as the case may be.

     (d)  Unless the Administrative Agent shall have received notice from a Bank
prior to or on the date of any Committed Borrowing that such Bank will not make
available to the Administrative Agent such Bank's share of such Committed
Borrowing, the Administrative Agent may assume that such Bank has made such
share available to the Administrative Agent on the date of such Committed
Borrowing in accordance with subsections (b) and (c) of this Section 2.04 and
the Administrative Agent may, in reliance upon such assumption, make available
to the Borrower on such date a corresponding amount. If and to the extent that
such Bank shall not have so made such share available to the Administrative
Agent, such Bank and the Borrower severally agree to repay to the Administrative
Agent forthwith on demand such corresponding amount together with interest
thereon, for each day from the date such amount is made available to the
Borrower until the date such amount is repaid to the Administrative Agent, at
(i) in the case of the Borrower, a rate per annum equal to the higher of the
Federal Funds Rate and the interest rate applicable thereto pursuant to Section
2.07 and (ii) in the case of such Bank, the Federal Funds Rate. If such Bank
shall repay to the Administrative Agent such corresponding amount, such amount
so repaid shall constitute such Bank's Committed Loan included in such Committed
Borrowing for purposes of this Agreement.  In no event shall any payment by the
Administrative Agent, or repayment by the Borrower, of any amount pursuant to
this subsection (d) relieve the Bank that failed to make available its share of
the related Committed Borrowing of its obligations hereunder.

     SECTION 2.05.   Committed Notes.   (a)  The Committed Loans of each Bank
                     ---------------                                         
shall be evidenced by a single Committed Note payable to the order of such Bank
for the account of its Applicable Lending Office in an amount equal to such
Bank's Commitment.

     (b)  Upon receipt of each Bank's Committed Note pursuant to Section 3.01,
the Administrative Agent shall send by overnight mail such Committed Note to
such Bank.  Each Bank shall record the date, amount and maturity of each
Committed Loan

                                      28
<PAGE>
 
made by it and the date and amount of each payment of principal made by the
Borrower with respect thereto, and prior to any transfer of its Committed Note
shall endorse on the schedule forming a part thereof appropriate notations to
evidence the foregoing information with respect to each such Committed Loan then
outstanding; provided, however, that the failure of any Bank to make any such
             --------  -------
recordation or endorsement shall not affect the obligations of the Borrower
hereunder or under the Committed Notes. Each Bank is hereby irrevocably
authorized by the Borrower so to endorse its Committed Note and to attach to and
make a part of its Committed Note a continuation of any such schedule as and
when required.

     SECTION 2.06.   Maturity of Committed Loans.  Subject to any rights of the
                     ---------------------------                               
Borrower under Section 2.08, each Committed Loan included in any Committed
Borrowing shall mature, and the principal amount thereof shall be due and
payable, on the last day of the Interest Period applicable to such Committed
Borrowing.

     SECTION 2.07.   Interest Rates.  (a)  Each Base Rate Loan shall bear
                     --------------                                      
interest on the outstanding principal amount thereof, for each day from the date
such Committed Loan is made until it becomes due, at a rate per annum equal to
the Base Rate for such day.  Such interest shall be payable for each Interest
Period on the last day thereof. Any overdue principal of and, to the extent
permitted by law, overdue interest on any Base Rate Loan shall bear interest,
payable on demand, for each day until paid at a rate per annum equal to the
lesser of (i) the sum of 2 percent, plus the rate otherwise applicable to Base
Rate Loans for such day, or (ii) the Highest Lawful Rate.

     (b)  Each Euro-Dollar Committed Loan shall bear interest on the outstanding
principal amount thereof, for the Interest Period applicable thereto, at a rate
per annum equal to the lesser of (i) the sum of the Euro-Dollar Margin (as in
effect on the first day of such Interest Period), plus the Euro-Dollar Rate or
(ii) the Highest Lawful Rate.  Such interest shall be payable for each Interest
Period on the last day thereof and, if such Interest Period is longer than three
months, at intervals of three months after the first day thereof.

     "Euro-Dollar Margin" means, for any Interest Period, the Applicable Margin
for Euro-Dollar Committed Loans.

     "Euro-Dollar Rate" means, for the Interest Period for each Euro-Dollar
Committed Loan comprising part of the same Borrowing, an interest rate per annum
equal to the rate per annum at which deposits in U.S. dollars are offered by the
principal office of the Reference Bank to first class banks in the interbank
eurodollar market selected by the Reference Bank, as shown on the Dow Jones
Telerate Screen (Pages 314, 872 and 4833) or, if the Dow Jones Telerate Screen
is not available, as shown on the Bloomberg Screen British Banker's LIBOR
fixing, at or around 9:00 a.m. (Houston time), two (2) Business Days before the
first day of such Interest Period (except in the 

                                      29
<PAGE>
 
case of a Borrowing with an Interest Period of 7 days or less, which shall be
10:30 a.m. (Houston time) on the Business Day of such Borrowing) in an amount
substantially equal to the amount of the Euro-Dollar Committed Loan of the
Reference Bank comprising part of such Borrowing to be outstanding during such
Interest Period and for a period equal to such Interest Period.

     (c)  Any overdue principal of and, to the extent permitted by law, overdue
interest on any Euro-Dollar Committed Loan shall bear interest, payable on
demand, for each day from and including the date payment thereof was due to but
excluding the date of actual payment, at a rate per annum equal to the lesser of
(i) the sum of 2 percent, plus the rate applicable to Base Rate Loans for such
day or (ii) the Highest Lawful Rate.

     (d)  The Administrative Agent shall determine each interest rate applicable
to the Committed Loans hereunder.  The Administrative Agent shall give prompt
notice to the Borrower and the participating Banks by telecopy, telex or cable
of each rate of interest so determined, and its determination thereof shall be
conclusive in the absence of manifest error.

     (e)  The Reference Bank, if not the Administrative Agent, agrees to use its
best efforts to furnish quotations to the Administrative Agent as contemplated
by this Section.  If the Reference Bank, if not the Administrative Agent, does
not furnish a timely quotation, the Administrative Agent shall determine the
relevant interest rate on the basis of the quotation or quotations furnished by
the remaining Reference Bank or, if none of such quotations is available on a
timely basis, the provisions of Section 8.01 shall apply.

     (f)  Competitive Loans shall bear interest as set forth in Section 2.10(i).

     SECTION 2.08.   Conversions and Continuances.  At the end of any Interest
                     ----------------------------                             
Period, the Borrower shall have the option to convert or continue all or a
portion, equal to not less than $5,000,000 ($1,000,000 in the case of
conversions or continuations into Base Rate Loans), of the outstanding principal
amount of one Type of its Committed Loans made pursuant to one or more Committed
Borrowings into a Committed Borrowing or Committed Borrowings of the other Type
or Types of Committed Loans; provided, however, that except as otherwise
                             --------  -------                          
provided in Section 8.03, no partial conversion or continuation of Euro-Dollar
Committed Loans shall reduce the outstanding principal amount of Euro-Dollar
Committed Loans made pursuant to any single Borrowing to less than $5,000,000
and (ii) Base Rate Loans may be converted into Euro-Dollar Committed Loans or
continued as Base Rate Loans, and Euro-Dollar Committed Loans may be continued
as Euro-Dollar Committed Loans or converted into Base Rate Loans for additional
Interest Periods if and only if, in either case no Default or Event of Default
is in existence on the date of the conversion or 

                                      30
<PAGE>
 
continuation. Each such conversion or continuation shall be effected by the
Borrower giving the Administrative Agent notice substantially in the form of
Exhibit 2.08 (each a "Notice of Conversion") prior to 11:00 a.m. (Houston time)
at least (a) three Euro-Dollar Business Days prior to the date of such
conversion or continuation in the case of a conversion or continuation into 
Euro-Dollar Committed Loans (unless such conversion or continuation of Euro-
Dollar Committed Loans is into an Interest Period of seven days or less, in
which event such notice shall be delivered no later than 10:30 a.m. (Houston
time) on the Business Day of such Borrowing) and (b) one Domestic Business Day
in the case of a conversion or continuation into Base Rate Loans, specifying
each Type of Borrowing (or portions thereof) to be so converted or continued
and, if to be converted or continued into Euro-Dollar Committed Loans, the
Interest Period to be initially applicable thereto. The Administrative Agent
shall promptly give the Banks written or telephonic notice (promptly confirmed
in writing) of any such proposed conversion or continuation affecting any of its
Loans.

     SECTION 2.09.   Pro Rata Committed Borrowings.  All Committed Borrowings
                     -----------------------------                           
under this Agreement shall be incurred from the Banks ratably in proportion to
their respective Commitments.  It is understood that no Bank shall be
responsible for any default by any other Bank in its obligation to make
Committed Loans hereunder and that each Bank shall be obligated to make the
Loans provided to be made by it hereunder, regardless of the failure of any
other Bank to fulfill its Commitment hereunder.

     SECTION 2.10.   Competitive Borrowings.  (a) The Borrower may, from time
                     ---------------------- 
to time, request the Auction Agent to deliver to the Banks a request for
Competitive Bids, to which any one or more of the Banks may, but are not
obligated to, respond. To request a Competitive Bid, the Borrower shall hand
deliver, telex or telecopy to the Auction Agent a duly completed request for
Competitive Bid in the form of Exhibit 2.10(a) (a "Competitive Bid Request"), to
                               ---------------     ----------------------- 
be received by the Auction Agent (i) in the case of: a Euro-Dollar Competitive
Loan, not later than 9:00 a.m. (Houston time), four Euro-Dollar Business Days
before the Borrowing Date specified for a proposed Competitive Borrowing and
(ii) in the case of an Alternate Competitive Loan, not later than 9:00 a.m.
(Houston time), one Domestic Business Day before the Borrowing Date specified
for a proposed Competitive Borrowing. A Competitive Bid Request that does not
conform substantially to the format of Exhibit 2.10(a) may be rejected in the
                                       ---------------
Auction Agent's sole discretion, and the Auction Agent shall promptly notify the
Borrower of such rejection by telex or telecopier. Each Competitive Bid Request
shall in each case refer to this Agreement and specify (i) whether the
Competitive Loans then being requested are to be Euro-Dollar Competitive Loans
or Alternate Competitive Loans, (ii) the Borrowing Date of such Competitive
Loans and the aggregate principal amount thereof which shall not be less than
$5,000,000 or greater than the unused Committed Amount on such Borrowing Date
and shall be in integral multiples of $1,000,000), (iii) the Interest Period
with respect thereto and (iv) the total Borrowings

                                      31
<PAGE>
 
(Committed and Competitive) outstanding hereunder. Upon receipt of a
satisfactory Competitive Bid Requests, the Auction Agent shall forward a Notice
of Competitive Bid Request on to each of the Banks by telex or telecopier on the
terms and conditions of this Agreement, to make Competitive Bids pursuant to
such Notice of Competitive Bid Request. The Notice of Competitive Bid Request
with respect to any proposed Competitive Borrowing shall be given to the Banks
promptly, and in no event later than 12:00 noon (Houston time), (i) in the case
of Euro-Dollar Competitive Loans, four Euro-Dollar Business Days before the
Borrowing Date specified for such proposed Competitive Borrowing, and (ii) in
the case of Alternate Competitive Loans, one Business Day before the Borrowing
Date specified for such Competitive Borrowing.

     (b)  (i)  Each Bank may, in its sole discretion, make a Competitive Bid to
the Borrower responsive to each Notice of Competitive Bid Request.  Each
Competitive Bid by a Bank must be submitted to the Auction Agent via telex or
telecopier, (A) in the case of Euro-Dollar Competitive Loans, not later than
8:30 a.m. (Houston time), three Euro-Dollar Business Days before the Borrowing
Date specified for a proposed Competitive Borrowing and (B) in the case of
Alternate Competitive Loans, not later than 8:30 a.m. (Houston time), on the
Borrowing Date specified for a proposed Competitive Borrowing.  Each Competitive
Bid shall refer to this Agreement and (A) specify the principal amount which
shall not be less than $5,000,000 and integral multiples of $1,000,000, or (B)
specify the interest rate or rates at which the Bank is prepared to make the
Competitive Loan and (C) confirm the Borrowing Date and the Interest Period (if
any) with respect thereto specified by the Borrower.  If any Bank shall elect
not to make a Competitive Bid, such Bank shall so notify the Auction Agent via
telex or telecopier (A) in the case of Euro-Dollar Competitive Loans, not later
than 8:30 a.m. (Houston time), three Euro-Dollar Business Days before the
Borrowing Date specified for a proposed Competitive Borrowing and (B) in the
case of Alternate Competitive Loans, not later than 8:30 a.m. (Houston time), on
the Borrowing Date specified for a proposed Competitive Borrowing; provided,
                                                                   -------- 
however, that failure by any Bank to give such notice shall not cause such Bank
- -------                                                                        
to be obligated to make any Competitive Loan as part of such Competitive
Borrowing and shall constitute rejection. A Competitive Bid submitted by a Bank
pursuant to this paragraph shall be irrevocable;

          (ii) with respect to any Competitive Bid for a Euro-Dollar Competitive
Borrowing, the interest rate shall be calculated on the basis of the LIBO Rate,
which means an interest rate per annum equal to the arithmetic average (rounded
upwards, if not already a whole multiple of 1/16 of 1%, to the next higher 1/16
of 1%) of the rate per annum at which deposits in U.S. dollars are offered in
immediately available funds to the principal office of the Reference Bank in
London, England (or if a Reference Bank does not at the time any such
determination is made maintain an office in London, England, the principal
office of any Affiliate of such Reference Bank in London, England), at 11:00
a.m., London time (or as soon thereafter as practicable), 

                                      32
<PAGE>
 
two Business Days before the first day of such Interest Period with a maturity
equal to the applicable Interest Period.

     (c)  The Auction Agent will arrange the bids in ascending yield order. In
the case of (i) Euro-Dollar Competitive Loans, not later than 9:00 a.m. (Houston
time), three Euro-Dollar Business Days before the proposed Borrowing Date
specified for a proposed Competitive Borrowing and (ii) Alternate Competitive
Loans, not later than 9:00 a.m. (Houston time), on the Borrowing Date specified
for a proposed Competitive Borrowing, the Auction Agent shall notify the
Borrower of the terms (i) of any Competitive Bid submitted by a Bank that is in
accordance with subsection (b) of this Section and (ii) of any subsequent
Competitive Bids submitted by such Bank with respect to the same Notice of
Competitive Bid Request; provided that any such subsequent Competitive Bid shall
                         --------                                               
be disregarded by the Auction Agent unless such subsequent Competitive Bid is
submitted solely to correct a manifest error in such former Competitive Bid.
The Auction Agent's notice to the Borrower shall specify (i) the aggregate
principal amount of Competitive Bids for which offers have been received for
each Interest Period specified in the related Notice of Competitive Bid Request,
(ii) the respective principal amounts and interest rates, so offered and (iii)
if applicable, limitations on the aggregate principal amount of Competitive Bids
for which offers in any single Notice of Competitive Bid Request may be
accepted.

     (d)  If offers are made by two or more Banks with the same interest rates
for a greater aggregate principal amount of Competitive Loans than can be
accepted for the related Interest Period (after giving effect to the acceptance
of all lower Interest Rates, as the case may be, properly offered for such
Interest Period), the principal amount of Competitive Loans which can be
accepted shall be allocated by the Borrower among such Banks as nearly as
possible (in such multiples of $1,000,000 (or the approximate equivalent amount
thereof), as the Borrower may deem appropriate) in proportion to the aggregate
principal amount of such offers. Determinations by the Borrower of the amounts
of Competitive Loans to be made by each Bank shall be conclusive in the absence
of manifest error.

     (e)  The Borrower may in its sole and absolute discretion, subject only to
the provisions of this paragraph, accept or reject any Competitive Bid and shall
notify Auction Agent by telex or telecopier whether and to what extent it has
decided to accept or reject the bids (i) in the case of Euro-Dollar Competitive
Loans, not later than 10:00 a.m. (Houston time), three Euro-Dollar Business Days
before the Borrowing Date specified for a proposed Competitive Borrowing and
(ii) in the case of Alternate Competitive Loans, not later than 10:00 a.m.
(Houston time), on the Borrowing Date specified for a proposed Competitive
Borrowing; provided, however, that (y) the failure of the Borrower to accept or
           --------  -------                                                   
reject any bid within the time period specified shall be deemed to be a
rejection of such bid and (z) the aggregate amount of the Competitive Bids
accepted by the Borrower shall not exceed the principal amount specified in the

                                      33
<PAGE>
 
Notice of Competitive Bid Request. Failure to notify the Auction Agent of
acceptance by said time shall be deemed a rejection of a Competitive Bid.

     (f)  Upon receipt of a notice of the Borrower's acceptance of a Competitive
Bid, the Auction Agent shall promptly notify each Bank of the contents thereof
and of such Bank's ratable share (if any) of such Competitive Loan and such
notice of the Borrower's acceptance of a Competitive Bid shall not thereafter be
revocable by the Borrower giving such notice.  The Borrower shall notify the
Auction Agent and the Auction Agent shall also notify each Bank of the aggregate
principal amount of all Competitive Bids accepted.  Promptly, upon notice from
the Auction Agent of the Borrower's acceptance of a Competitive Bid, the
successful bidders will become bound, subject to the other applicable conditions
hereof, to make the Competitive Loan in respect of which its bid has been
accepted and shall forward the required funds to the Borrower on the Borrowing
Date indicated in its Competitive Bid.

     (g)  All Competitive Loans shall reduce the unused portion of the Committed
Amount by the total amount advanced; provided, however, that each Bank's
                                     --------- --------                 
percentage of the aggregate unused Commitment shall remain unchanged, regardless
of the extent to which such Bank participates in any Competitive Borrowing.

     (h)  (i) The Competitive Loan of each Bank shall be evidenced by a single
Competitive Note payable to the order of such Bank for the account of its
Applicable Lending Office in an amount equal to the Committed Amount.  (ii) Upon
receipt of each Bank's Competitive Note pursuant to Section 3.01, the
Administrative Agent shall send by overnight mail said Competitive Note to such
Bank.  Each Bank shall record the date, amount and maturity of each Competitive
Loan made by it and the date and amount of each payment of principal made by the
Borrower with respect thereto, and prior to any transfer of its Competitive Note
shall endorse on the schedule forming a part thereof appropriate notations to
evidence the foregoing information with respect to each such Competitive Loan
then outstanding; provided, however, that the failure of any Bank to make any
                  --------  -------                                          
such recordation or endorsement shall not affect the obligations of the Borrower
hereunder or under the Competitive Notes.  Each Bank is hereby irrevocably
authorized by the Borrower so to endorse its Competitive Note and to attach to
and make a part of its Competitive Note a continuation of any such schedule as
and when required.

     (i)  Each Competitive Loan shall bear interest at the rate set forth in the
Competitive Bid by the bidding Bank which has been accepted by the Borrower.
Any overdue principal of and, to the extent permitted by law, overdue interest
on any Competitive Loan shall bear interest, payable on demand, for each day
from and including the date payment thereof was due to but excluding the date of
actual payment, at a rate per annum equal to the lesser of (i) the sum of 2
percent, plus the rate applicable to Base Rate Loans for such day or (ii) the
Highest Lawful Rate.

                                      34
<PAGE>
 
     SECTION 2.11.   Optional Termination or Reduction of Commitments.  The
                     ------------------------------------------------      
Borrower may, upon at least three Domestic Business Days' notice to the
Administrative Agent, (i) terminate the Commitments at any time, if no Loans or
Letters of Credit are outstanding at such time or (ii) ratably reduce from time
to time by an aggregate amount of $5,000,000 or any larger multiple of
$1,000,000, the Committed Amount in excess of the sum of the aggregate
outstanding principal amount of the Loans, plus the Letter of Credit
Outstandings; provided, however, that if no Loans are then outstanding, the
              --------  -------                                            
Borrower may terminate the Commitments at any time when there are outstanding
Letters of Credit by depositing with the Administrative Agent such amount of
cash as is equal to the aggregate Stated Amount of the Letters of Credit then
outstanding to be held in an interest bearing account with the Administrative
Agent, all such cash and interest to be held by the Administrative Agent as
security for the obligations of the Borrower in respect of such Letters of
Credit; provided further, that the Borrower shall remain liable for any expenses
        -------- -------                                                        
and other liabilities in respect of such Letters of Credit on terms consistent
with Section 9.04, but for all other purposes of this Agreement and the other
Loan Documents the Obligations will be deemed paid in full and not outstanding.
Any reduction of the Commitments shall apply proportionately to the Commitment
of each Bank in accordance with its Commitment Percentage and any such reduction
shall be permanent.

     SECTION 2.12.   Mandatory Termination of Commitments.  The Commitment of
                     ------------------------------------                    
each Bank shall terminate on the Termination Date, and all Loans then
outstanding (together with accrued interest thereon) shall be due and payable on
such date; provided, however, if there are any Letter of Credit Outstandings or
           --------  -------                                                   
unpaid Loans on the Termination Date, all obligations of the Borrower and all
rights and remedies of the Banks hereunder shall continue, subject to the
provisos of Section 2.10, until the full and final repayment thereof.

     SECTION 2.13.   Optional Prepayments.  (a)  The Borrower may, upon at
                     --------------------                                 
least one Domestic Business Day's notice to the Administrative Agent, prepay any
Base Rate Borrowing (or any other Borrowing bearing interest at the Base Rate
pursuant to Article VIII) or, subject to Section 2.15 and upon at least three
Euro-Dollar Business Days' notice to the Administrative Agent, prepay any Euro-
Dollar Committed Borrowing, in whole at any time, or from time to time in part
in amounts aggregating $5,000,000 or any larger multiple of $1,000,000, by
paying the principal amount to be prepaid together with accrued interest thereon
to but excluding the date of prepayment. Each such optional prepayment shall be
applied to prepay ratably the Committed Loans of the several Banks included in
such Committed Borrowing. Competitive Loans may not be prepaid.

     (b)  Upon receipt of a notice of prepayment pursuant to this Section, the
Administrative Agent shall promptly notify each Bank of the contents thereof and
of 

                                      35
<PAGE>
 
such Bank's ratable share (if any) of such prepayment and such notice shall not
there after be revocable by the Borrower.

     SECTION 2.14.   General Provisions as to Payments.
                     --------------------------------- 

     (a)  The Borrower shall make each payment of principal of, and interest on,
the Loans and of fees hereunder, not later than 12:00 noon (Houston time) on the
date when due, in Federal or other funds immediately available in Houston, to
the Administrative Agent at its address referred to in Section 9.01.  The
Administrative Agent will promptly distribute to each Bank its ratable share, if
any, of each such payment received by the Administrative Agent for the account
of the Banks. Whenever any payment of principal of, or interest on, the Base
Rate Loans or Alternate Competitive Loans or of fees shall be due on a day which
is not a Domestic Business Day, the date for payment thereof shall be extended
to the next succeeding Domestic Business Day. Whenever any payment of principal
of, or interest on, the Euro-Dollar Committed Loans and the Euro-Dollar
Competitive Loans shall be due on a day which is not a Euro-Dollar Business Day,
the date for payment thereof shall be extended to the next succeeding Euro-
Dollar Business Day unless such Euro-Dollar Business Day falls in another
calendar month, in which case the date for payment thereof shall be the next
preceding Euro-Dollar Business Day.  If the date for any payment of principal is
extended by operation of law or otherwise, interest thereon shall be payable for
such extended time.

     (b)  Unless the Administrative Agent shall have received notice from the
Borrower prior to the date on which any payment is due to the Banks hereunder
that the Borrower will not make such payment in full, the Administrative Agent
may assume that the Borrower has made such payment in full to the Administrative
Agent on such date and the Administrative Agent may, in reliance upon such
assumption, cause to be distributed to each Bank on such due date an amount
equal to the amount then due such Bank.  If and to the extent that the Borrower
shall not have so made such payment, each Bank shall repay to the Administrative
Agent forthwith on demand such amount distributed to such Bank together with
interest thereon, for each day from the date such amount is distributed to such
Bank until the date such Bank repays such amount to the Administrative Agent, at
the Federal Funds Rate.

     SECTION 2.15.   Funding Losses.  The Borrower shall pay to the
                     --------------                                
Administrative Agent for the account of each Bank, upon the request of such Bank
through the Administrative Agent, such amount or amounts as shall compensate
such Bank for any reasonable loss, cost or expense actually incurred by such
Bank (or, subject to Section 9.07(b), by any existing Participant in the related
Committed Loan or Competitive Loan) as a result of:

                                      36
<PAGE>
 
          (a)  any payment or prepayment of a Euro-Dollar Committed Loan or a
     Competitive Loan (pursuant to Section 2.11 or Article VI or VIII or
     otherwise) held by such Bank (or such Participant) on a date other than the
     last day of the Interest Period applicable thereto, or

          (b)  any failure by the Borrower to borrow a Euro-Dollar Committed
     Loan or any Competitive Loan held or to be held by such Bank (or such
     Participant) on the date for such Borrowing specified in the relevant
     Notice of Committed Borrowing or Request for Competitive Bid,

such compensation to include, without limitation, an amount equal to the excess,
if any, of (i) the amount of interest which would have accrued on the amount so
paid or prepaid, or not converted or borrowed, for the period from the date of
such payment or prepayment or failure to borrow or convert to the last day of
such Interest Period (or, in the case of a failure to borrow, the Interest
Period for such Euro-Dollar Committed  Loan or Competitive Loan which would have
commenced on the date of such failure to convert or borrow) in each case at the
applicable rate of interest for such Euro-Dollar Committed Loan provided for
herein (excluding, however, the Euro-Dollar Margin included therein) or
Competitive Loan over (ii) the amount of interest (as reasonably determined by
such Bank or Participant) which would have accrued to such Bank or Participant
on such amount by placing such amount on deposit for a comparable period with
leading banks in the relevant interbank market; provided, however, that such
                                                --------  -------           
Bank shall have delivered to the Borrower, within 60 days after the date of such
payment or prepayment or failure to borrow, a certificate as to the amount of
such actual loss or expense, which certificate shall set forth in reasonable
detail the basis for such loss or expense and shall be conclusive in the absence
of manifest error. Any payment required to be made pursuant to this Section 2.15
shall be made within 5 days after receipt of the certificate referred to above.

     SECTION 2.16.   Fees.
                     ---- 

     (a)  Facility Fee.  The Borrower shall pay to the Administrative Agent for
          ------------                                                         
the account of each Bank a facility fee (the "Facility Fee") equal to the
Applicable Margin in effect from time to time on the amount of the Commitment
(whether used or unused) of that Bank. The Facility Fee shall accrue for the
account of each Bank from and including the date of this Agreement to but
excluding the Termination Date.

     (b)  Payments.  Accrued fees under this Section for the account of any Bank
          --------                                                              
shall be payable quarterly in arrears on each March 31, June 30, September 30
and December 31 and upon the Termination Date.

     SECTION 2.17.   Computation of Interest and Fees.  Interest based on the
                     --------------------------------                        
Prime Rate shall be computed on the basis of a year of 365 days (or 366 days in
a leap year) 

                                      37
<PAGE>
 
and paid for the actual number of days elapsed (including the first day but
excluding the last day). All other interest and all fees shall be computed on
the basis of a year of 360 days and paid for the actual number of days elapsed
(including the first day but excluding the last day) except that if use of a 
360-day year would cause any interest or fees constituting interest (within the
meaning of all applicable laws) to exceed the Highest Lawful Rate, then such
interest and fees will be computed on the basis of a year of 365 days (or 366 in
a leap year).

     SECTION 2.18.   Maximum Interest Rate.  (a)  It is the intention of each
                     ---------------------                                   
party hereto to comply strictly with all usury laws applicable to it regarding
the contracting for, and the taking, reserving, charging, collection, payment
and receipt of, interest (which, for purposes of this Section 2.18, shall be
deemed to include, without limitation, any compensation received by any Agent or
any Bank for the use, forbearance or detention of money (as such terms are used
in Tex. Rev. Civ. Stat. Ann. Art. 5069-1.01(a), the Texas Finance Code and the
Texas Credit Title) under or in connection with this Agreement and the Notes),
whether such laws are now or hereafter in effect and whether such laws are those
of the United States of America or other applicable jurisdiction (the
"Applicable Usury Laws").

     (b)  With respect to any Bank, if any payment by the Borrower or any other
Person to any Agent or such Bank hereunder or in connection with any transaction
contemplated hereby (including any payment upon acceleration of the maturity of
any Note of such Bank) would produce a rate of interest in excess of the
"Highest Lawful Rate" (as defined in paragraph (e) below), or if any such
payment would result in the Borrower or any other Person paying or being deemed
to have paid to any Agent or such Bank any interest in excess of the "Maximum
Amount," (as defined in paragraph (c) below) or if any Agent or such Bank shall
for any reason receive any unearned interest in violation of any Applicable
Usury Law, or if any transaction contemplated by, or any provision of, this
Agreement, any Note, any Letter of Credit Application or any other agreement or
instrument executed and delivered pursuant to or in connection with this
Agreement or any transaction contemplated hereby (collectively, such Bank's
"Loan Documents") would otherwise be usurious under Applicable Usury Laws, then,
notwithstanding anything to the contrary in such Bank's Loan Documents, the
parties hereto agree, to the maximum extent that they may do so under applicable
law, that: (i) the provisions of this Section 2.18 shall govern and control;
(ii) the aggregate amount of all interest under Applicable Usury Laws that is
contracted for, taken, reserved, charged, collected or received pursuant to such
Bank's Loan Documents or otherwise shall be limited such that under no
circumstances shall such interest exceed the Maximum Amount; (iii) neither the
Borrower nor any other Person shall be obligated to pay any amount of interest
that exceeds the Maximum Amount; and (iv) the provisions of such Bank's Loan
Documents immediately shall be deemed reformed, without the necessity of the
execution of any new document or instrument, so as to comply with the Applicable
Usury Laws (it being the intention of the parties hereto, 

                                      38
<PAGE>
 
to the fullest extent permitted by applicable law, to render inapplicable any
and all penalties of any kind provided by any Applicable Usury Law as a result
of any such excess interest).

     (c)  To the fullest extent permitted by Applicable Usury Laws, If any
payment by the Borrower or any other Person under any Bank's Loan Documents
(including any payment upon acceleration of the maturity of any Note) results in
the Borrower actually having paid to such Bank or any Agent any interest in
excess of the maximum amount of interest that such Bank or Agent may contract
for, take, reserve, charge, collect or receive under Applicable Usury Laws (the
"Maximum Amount"), then such excess amount shall be applied to the reduction of
the principal balance of such Bank's Loans or to other amounts (other than
interest) payable hereunder, and if no such principal is then outstanding, and
no such other amount is then payable, such excess or part thereof remaining
shall be repaid to the Borrower or such other Person.

     (d)  All interest paid, or agreed to be paid, pursuant to any Bank's Loan
Documents shall, to the fullest extent permitted by Applicable Usury Laws, be
amortized, prorated, allocated and spread throughout the stated term of any
indebtedness incurred under or evidenced by such Bank's Loan Documents.

     (e)  As used herein, the term "Highest Lawful Rate" means, with respect to
any Bank in all its various capacities hereunder, the maximum rate of interest
that may be contracted for, taken, reserved, charged, collected or received by
such Bank in respect of the extensions of credit under or evidenced by such
Bank's Loan Documents under the Applicable Usury Laws.  In this connection,
insofar as Texas law is ultimately determinative of the Highest Lawful Rate, the
Highest Lawful Rate shall be computed on the basis of (i) the "indicated rate
ceiling" from time to time in effect referred to in Tex. Rev. Civ. Stat. Ann.
Art. 5069-1.04, as modified by Section (a)(1) of such Art. 5069-1.04, and, to
the extent applicable after the date hereof, (ii) the "weekly ceiling" from time
to time in effect referred to in Section 303.21 of the Texas Finance Code and
Articles 1D.002 and 1D.003 of the Texas Credit Title; provided, however, that to
                                                      --------  -------         
the fullest extent permitted by Tex. Rev. Civ. Stat. Ann. Art. 5069, the Texas
Finance Code and the Texas Credit Title, as applicable, each Agent and each Bank
reserves the right to change from time to time the ceiling on which the Highest
Lawful Rate is based under such Texas laws by giving written notice thereof to
the Borrower in the manner and to the extent required such Texas laws.
Notwithstanding the foregoing, the Highest Lawful Rate for any Bank in all of
its various capacities hereunder shall not be limited to rate ceilings permitted
under Texas law, if other Applicable Usury Laws (whether applicable federal or
state laws and whether now or hereafter in effect) shall permit a higher rate of
interest to be contracted for, taken, reserved, charged, collected and received
under such Bank's Loan Documents.

                                      39
<PAGE>
 
     (f)  In the event that any rate of interest set forth in Section 2.07 or
8.01 on any Loan of any Bank (a "Stated Rate"), together with any fees or other
amounts payable under such Bank's Loan Documents to any Agent or such Bank, in
any of such Bank's capacities hereunder, deemed to constitute interest under
Applicable Usury Laws ("Additional Interest"), exceeds the Highest Lawful Rate,
then, the rate at which interest will accrue pursuant to such Bank's Loan
Documents shall be limited, notwithstanding anything to the contrary in such
Bank's Loan Documents, to the Highest Lawful Rate; provided, however, that, to
                                                   --------  -------          
the fullest extent permitted by Applicable Usury Laws, any subsequent reductions
in any Stated Rate shall not reduce the rate at which interest will accrue
pursuant to such Bank's Loan Documents below the Highest Lawful Rate until the
aggregate amount of interest payable to such Bank actually accrued pursuant to
such Bank's Loan Documents, together with all Additional Interest payable to
such Bank, equals the amount of interest which would have accrued if the Stated
Rates had at all times been in effect and such Additional Interest, if any, had
been paid in full.

     (g)  In the event that, at maturity or upon payment in full of all amounts
payable under any Bank's Loan Documents, the total amount of interest (including
all Additional Interest) accrued and paid under the terms of such Bank's Loan
Documents is less than the total amount of interest (including Additional
Interest) which would have accrued and been paid under such Bank's Loan
Documents if the Stated Rates had at all times been in effect and all Additional
Interest had been paid in full, then the Borrower shall, to the extent permitted
by Applicable Usury Laws, pay to the Administrative Agent for the account of
such Bank an amount equal to the difference between (1) the lesser of (i) the
amount of interest which would have accrued and been paid if the Highest Lawful
Rate for such Bank had at all times been in effect or (ii) the amount of
interest which would have accrued and been paid if the Stated Rates had at all
times been in effect and all Additional Interest had been paid in full and (2)
the amount of interest (including all Additional Interest) actually accrued and
paid to such Bank pursuant to such Bank's Loan Documents.

     (h)  To the extent permitted by applicable law, the Borrower, the Agents
and the Banks agree that, except for Article 15.10(b) thereof, the provisions of
Chapter 15, Subtitle 79, Revised Civil Statutes of Texas, 1925, as amended
(which regulates certain revolving credit loan accounts and revolving tri-party
accounts), do not apply to this Agreement or any of the Notes or any of the
Obligations.

     SECTION 2.19.   Withholding Tax Exemption.  At least five Domestic
                     -------------------------                         
Business Days prior to the first date on which interest or fees are payable
hereunder for the account of any Bank, each Bank that is not incorporated under
the laws of the United States of America or a state thereof agrees that it will
deliver to each of the Borrower and the Administrative Agent two duly completed
copies of United States Internal Revenue Service Form 1001 or 4224, certifying
in either case that such Bank is  

                                      40
<PAGE>
 
entitled to receive payments under this Agreement and the Notes without
deduction or withholding of any United States federal income taxes. Each Bank
which so delivers a Form 1001 or 4224 further undertakes to deliver to each of
the Borrower and the Administrative Agent two additional copies of such form (or
a successor form) on or before the date that such form expires or becomes
obsolete or after the occurrence of any event requiring a change in the most
recent form so delivered by it, and such amendments thereto or extensions or
renewals thereof as may be reasonably requested by the Borrower or the
Administrative Agent, in each case certifying that such Bank is entitled to
receive payments under this Agreement and the Notes without deduction or
withholding of any United States federal income taxes, unless an event
(including without limitation any change in treaty, law or regulation) has
occurred after the date hereof and prior to the date on which any such delivery
would otherwise be required which renders all such forms inapplicable or which
would prevent such Bank from duly completing and delivering any such form with
respect to it and such Bank advises the Borrower and the Administrative Agent
that it is not capable of receiving payments without any deduction or
withholding of United States federal income tax. Any Bank that is not capable of
receiving payments without any deduction or withholding of United States federal
income tax will promptly notify the Borrower and the Administrative Agent to
that effect and will designate a different Applicable Lending Office if such
designation will render such Bank capable of receiving payments without any such
deduction or withholding and will not, in the reasonable judgment of such Bank,
be otherwise disadvantageous. If the Borrower shall receive a certificate of
such Bank claiming the need for deductions or withholdings under this Section
2.19, the Borrower shall, subject to Section 8.06, commence making any
deductions and withholding any amounts with respect to payments for the account
of such Bank that are required by applicable law.

                                  ARTICLE III

                                  CONDITIONS

      SECTION 3.01.   Effectiveness.  This Agreement shall become effective as
                      -------------                                           
of December 1, 1997 on (a) execution of this Agreement by the Administrative
Agent and  the Borrower and receipt by the Administrative Agent of counterparts
of this Agreement signed by the other Agents and the Banks listed on the
signature pages hereto (or, in the case of any party as to which an executed
counterpart shall not have been received, receipt by the Administrative Agent in
form reasonably satisfactory to it of telecopied, telegraphic, telex or other
written confirmation from such party of execution of a counterpart hereof by
such party) and (b) receipt by the Administrative Agent of evidence of
termination by the Borrower of the "Commitments" of the "Banks" under and as
such terms are defined in the Borrower's $400,000,000 Amended and Restated
Credit Agreement dated as of June 27, 1995, as amended, among the Borrower, the
Agents (or the predecessors thereof) and the other financial 

                                      41
<PAGE>
 
institutions party thereto, and the payment of all fees and other "Obligations"
becoming due and payable thereunder as a result of such termination; provided,
                                                                     --------
however, the respective obligations hereunder of the Banks to make their initial
- -------
Loans and of the Issuing Bank to issue its intial Letter of Credit shall be
subject to the satisfaction of the following conditions precedent on or prior to
the date of any such Credit Event (or the waiver thereof in accordance with
Section 9.05):

          (i)   receipt by the Administrative Agent of (1) certified copies of
     the Certificate of Incorporation and By-Laws of the Borrower and the
     resolutions of the Board of Directors of the Borrower authorizing the
     transactions contemplated hereby, (2) certified copies of the Equistar
     Partnership Agreement and (3) such other documents as the Administrative
     Agent or the Required Banks may reasonably request relating to the
     existence of the Borrower, the corporate authority for and the validity of
     this Agreement and the Notes, and any other matters relevant hereto, all in
     form and substance satisfactory to the Administrative Agent;

          (ii)  receipt by the Administrative Agent of a Certificate of
     Incumbency dated on or after the Effective Date executed by the Secretary
     or an Assistant Secretary of the Borrower in substantially the form of
     Exhibit 3.01(ii), setting forth the name, title and specimen signature of
     each Authorized Officer or Authorized Representative of the Borrower (1)
     who has signed this Agreement on behalf of the Borrower, (2) who will sign
     the Notes on behalf of the Borrower or (3) who will, until replaced by
     another officer or representative duly authorized for that purpose, act as
     the representative of the Borrower for the purposes of signing documents
     and giving notices and other communications by the Borrower in connection
     with this Agreement and the transactions contemplated hereby;
 
          (iii) receipt by the Administrative  Agent of a certificate dated on
     or after the Effective Date signed by the Chief Executive Officer or Chief
     Administrative Officer of the Borrower to the effects set forth in clauses
     (iii) and (iv) of Section 3.02;

          (iv)  receipt by the Administrative Agent of an opinion of the Chief
     Corporate Counsel of the Borrower dated on or after the Effective Date in
     substantially the form of Exhibit 3.01(iv) and covering such additional
     matters relating to the transactions contemplated hereby as the Required
     Banks may reasonably request;

          (v)   receipt by the Agents of an opinion of Andrews & Kurth L.L.P.,
     counsel for the Agents, dated on or after the Effective Date in
     substantially the form of Exhibit 3.01(v) and covering such additional
     matters relating to the

                                      42
<PAGE>
 
     transactions contemplated hereby as the Required Banks may reasonably
     request;

          (vi)   receipt by the Administrative Agent of a certificate dated on
     or after the Effective Date signed by the Chief Executive Officer or any
     Vice President of LRC to the effect that LRC is not in default in its
     material obligations pursuant to the LCR Regulations;

          (viii) receipt by the Administrative Agent of certificates dated on
     or after the Effective Date signed by the Chief Executive Officer, any Vice
     President or the Treasurer of each of the Lyondell Equistar Partners,
     Lyondell Methanol GP and Lyondell Methanol LP to the effect that such
     Persons are not in default in their respective material obligations under
     the Equistar Partnership Agreement or the Methanol Partnership Agreement,
     as the case may be; and

          (ix)   receipt by the Administrative Agent for the account of each
     Bank of a duly executed Committed Note dated the Effective Date, complying
     with the provisions of Section 2.05 and a duly executed Competitive Note
     dated the Effective Date, complying with the provisions of Section 2.10.

The Administrative Agent shall promptly notify the Borrower and the Banks of the
Effective Date, and such notice shall be conclusive and binding on all parties
hereto. The Administrative Agent shall, promptly after the receipt thereof,
forward to the Banks copies of the documents delivered pursuant to this Section
3.01.

     SECTION 3.02.   Credit Events.  (a) The obligation of any Bank to make a
                     -------------                                           
Committed Loan on the occasion of any Committed Borrowing hereunder and the
obligation of the Issuing Bank to issue, renew or extend any Letter of Credit
hereunder are subject to the satisfaction of the following conditions:

          (i)    receipt by the Administrative Agent of a Notice of Committed
     Borrowing as required by Section 2.02 or receipt by the Issuing Bank of a
     Letter of Credit Request as required by Section 2.03, as the case may be;

          (ii)   the fact that, immediately after such Credit Event, the
     aggregate outstanding principal amount of the Committed Loans, plus the
     Letter of Credit Outstandings, plus the aggregate outstanding principal
     amount of the Competitive Loans will not exceed the Committed Amount;

          (iii)  the fact that, immediately before and after such Credit Event,
     no Default or Event of Default shall have occurred and be continuing; and

                                      43
<PAGE>
 
          (iv) the fact that the representations and warranties of the Borrower
     contained in this Agreement shall be true in all material respects on and
     as of the date of such Credit Event as if made on and as of such date
     (except in the case of a Refunding Borrowing, the representations and
     warranties set forth in paragraphs (f), (g), (m) and (n) of Section 4.01),
     unless a representation and warranty expressly relates to an earlier date,
     in which event such representation and warranty was true in all material
     respects at such date.

(b) The obligation of each Bank bound to make a Competitive Loan pursuant to
Section 2.10 on the occasion of a Competitive Borrowing (including the initial
Competitive Borrowing) is subject to the further condition precedent that:

          (i)  The Auction Agent and the Administrative Agent shall have
     received a Competitive Bid Request with respect thereto; and

          (ii) On the Borrowing Date of such Competitive Borrowing, the
     following statements shall be true (and each of the giving of the
     applicable Competitive Bid Request and the acceptance by the Borrower of
     the proceeds of such Competitive Borrowing shall constitute a
     representation and warranty by the Borrower that on the date of such
     Competitive Borrowing such statements are true):

               (A)  the fact that, immediately after such Credit Event, the
          aggregate outstanding principal amount of the Committed Loans, plus
          the Letter of Credit Outstandings, plus the aggregate outstanding
          principal amount of the Competitive Loans, will not exceed the
          Committed Amount;

               (B)  the fact that, immediately before and after such Credit
          Event, no Default or Event of Default shall have occurred and be
          continuing; and

               (C)  the fact that the representations and warranties of the
          Borrower contained in this Agreement shall be true in all material
          respects on and as of the date of such Credit Event as if made on and
          as of such date, unless a representation and warranty expressly
          relates to an earlier date, in which event such representation and
          warranty was true in all material respects at such date.

Each Credit Event hereunder shall be deemed to be a representation and warranty
by the Borrower on the date of such Borrowing as to the facts specified in
clauses (ii), (iii) and (iv) of paragraph (a) or clause (ii) of paragraph (b),
as the case may be.

                                      44
<PAGE>
 
                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES

      SECTION 4.01.   Representations and Warranties of the Borrower.  The
                      ----------------------------------------------      
Borrower represents and warrants to the Agents and the Banks as follows:

          (a)(1) The Borrower is (i) a corporation duly incorporated, validly
     existing and in good standing under the laws of the State of Delaware and
     (ii) qualified to do business and in good standing in each jurisdiction
     where the ownership of its properties or the conduct of its business
     requires such qualification, except where the failure to be so qualified
     would not have a Material Adverse Effect.

          (2)    The Borrower has all corporate power and authority,
     governmental permits, licenses, consents, authorizations, orders and
     approvals and other authorizations and powers as are necessary to carry on
     its business substantially as presently conducted, except where the failure
     to have such power, authority, permits, licenses, consents, authorizations,
     orders and approvals would not have a Material Adverse Effect.

          (3)    The execution, delivery and performance by the Borrower of this
     Agreement and of the Notes, and the Borrowings and other extensions of
     credit hereunder, are within the Borrower's corporate power and authority
     and have been duly authorized by all necessary corporate proceedings.

          (4)    Neither such authorization nor the execution, delivery and
     performance by the Borrower of this Agreement or of the Notes, nor any
     Borrowing or Letter of Credit when made or issued, as the case may be,
     hereunder will conflict with, result in a breach of or constitute a default
     under any of the terms, conditions or provisions of any law or any
     regulation, order, writ, injunction or decree of any court or governmental
     authority or of the Certificate of Incorporation or By-Laws of the Borrower
     or result in the violation or contravention of, or the acceleration of any
     obligation under, or cause the creation of any Lien on any of the assets of
     the Borrower pursuant to the provisions of, any indenture, loan or credit
     agreement or other material instrument to which it is a party or by which
     it is bound.

          (5)    Assuming its due execution by the Banks and the Agents, this
     Agreement constitutes a legal, valid and binding agreement of the Borrower
     and the Notes, when duly executed on behalf of the Borrower and delivered
     in accordance with this Agreement, will constitute legal, valid and binding
     obligations of the Borrower.

                                      45
<PAGE>
 
          (b)(1) The consolidated balance sheet of the Borrower and its
     Consolidated Subsidiaries as of December 31, 1996 and the related
     consolidated statements of income and cash flows for the fiscal year ended
     that date, reported on by Coopers & Lybrand, L.L.P., copies of which have
     been delivered to the Administrative Agent, present fairly, in all material
     respects, the consolidated financial position of the Borrower and its
     Consolidated Subsidiaries as of such date and their consolidated results of
     operations and cash flows for such fiscal year, in conformity with
     generally accepted accounting principles consistently applied.

          (2)    The unaudited consolidated balance sheet of the Borrower and
     its Consolidated Subsidiaries as of September 30, 1997 and the related
     unaudited consolidated statements of income and cash flows for the nine-
     month period then ended, copies of which have been delivered to the
     Administrative Agent, present fairly, in all material respects, in
     conformity with generally accepted accounting principles applied on a basis
     consistent with the financial statements referred to in paragraph (b)(1) of
     this Section, the consolidated financial position of the Borrower and its
     Consolidated Subsidiaries as of such date and their consolidated results of
     operations and cash flows for such nine-month period (subject to normal
     year-end adjustments and not including footnotes or schedules required by
     generally accepted accounting principles).

          (c)(1) The balance sheet of LCR as of December 31, 1996 and the
     related statements of income and cash flows for the fiscal year ended that
     date, reported on by Coopers & Lybrand, L.L.P., copies of which have been
     delivered to the Administrative Agent, present fairly, in all material
     respects, the financial position of LCR as of such date and its results of
     operations and cash flows for such fiscal year, in conformity with
     generally accepted accounting principles consistently applied.

          (2)    The unaudited balance sheet of LCR as of September 30, 1997 and
     the related statements of income and cash flows for the nine-month period
     then ended, copies of which have been delivered to the Administrative
     Agent, present fairly, in all material respects, in conformity with
     generally accepted accounting principles applied on a basis consistent with
     the financial statements referred to in paragraph (c)(1) of this Section,
     the financial position of LCR as of such date and its results of operations
     and cash flows for such three-month period (subject to normal year-end
     adjustments and not including footnotes or schedules required by generally
     accepted accounting principles).

          (d)    The Borrower has heretofore furnished to the Administrative
     Agent and the Banks the unaudited balance sheet of Equistar and its
     Subsidiaries prepared on a pro forma combined basis, as of June 30, 1997
     and the

                                      46
<PAGE>
 
     unaudited income statement of Equistar and its Subsidiaries prepared on a
     pro forma combined basis for the 12-month period ended December 31, 1996
     and for the six-month period ended June 30, 1997.  Such pro forma balance
     sheet and income statements have been prepared in good faith based on the
     assumptions used to prepare the pro forma financial information continued
     in the Joint Proxy Statement (which assumptions are believed by the
     Borrower on the date hereof to be reasonable), are based on the best
     information available to the Borrower as of the date of the furnishing
     thereof, accurately reflect all adjustments required to be made to give
     effect the Joint Venture and present fairly, in all material respects, on a
     pro forma basis the estimated combined financial position of Equistar and
     its Subsidiaries as of June 30, 1997 and the 12-month and six-month periods
     ended December 31, 1996 and June 30, 1997, respectively.

          (e)  The unaudited balance sheet of Methanol as of September 30, 1997
     and the related statement of income for the nine-month period then ended,
     copies of which have been delivered to the Administrative Agent and the
     Banks, present fairly, in all material respects, in conformity with
     generally accepted accounting principles, the financial position of
     Methanol as of such date and its results of operations for such nine-month
     period (subject to normal year-end adjustments and not including footnotes
     or schedules required by generally accepted accounting principles).

          (f)  Except as described in the Borrower's Annual Report on Form 10-K
     for the year ended December 31, 1996 ("1996 Form 10-K") or any document
     filed subsequently by the Borrower pursuant to the Securities Exchange Act
     of 1934 ("'34 Act Report") or as otherwise disclosed in writing to the
     Administrative Agent and delivered to the Banks, there is no action, suit
     or proceeding pending or, to the knowledge of the Borrower, threatened
     against or affecting the Borrower or any of its Consolidated Subsidiaries
     in any court or before or by any arbitrator, governmental department,
     agency or instrumentality, an adverse decision in which could reasonably be
     expected to have a Material Adverse Effect.

          (g)  Except as described in the 1996 Form 10-K or any subsequent '34
     Act Report or as otherwise disclosed in writing to the Administrative Agent
     and delivered to the Banks, there has been no material adverse change since
     December 31, 1996 in the business, operations, affairs, assets, condition
     (financial or otherwise) or results of operations of the Borrower and its
     Consolidated Subsidiaries, considered as a whole.

          (h)  No Default or Event of Default has occurred and is continuing.

                                      47
<PAGE>
 
          (i)    No consent, authorization, order or approval of (or filing or
     registration with) any governmental commission or board or other
     governmental regulatory authority (other than routine reporting
     requirements) is required for the execution, delivery and performance by
     the Borrower of this Agreement or of the Notes.

          (j)    Each member of the Controlled Group has fulfilled its
     obligations under the minimum funding standards of ERISA and the Code with
     respect to each Plan and is in compliance with the presently applicable
     provisions of ERISA and the Code, except to the extent that any
     noncompliance would not reasonably be expected to have a Material Adverse
     Effect. No member of the Controlled Group has incurred any liability to the
     PBGC (other than for routine premiums due to the PBGC) or a Plan under
     Title IV of ERISA that would have a Material Adverse Effect.

          (k)(1) Each corporate Subsidiary is a corporation duly incorporated,
     validly existing and in good standing under the laws of its jurisdiction of
     incorporation, and has all corporate powers and all governmental licenses,
     authorizations, consents and approvals required to carry on its business
     substantially as presently conducted except for such powers, licenses,
     authorizations, consents or approvals the absence of which would not
     reasonably be expected to have a Material Adverse Effect.

          (2)    LCR is a limited liability company duly organized, validly
     existing and in good standing under the laws of the State of Texas and is
     registered, qualified or licensed (or has applied for such registration,
     qualification or licensing) to do business and is in good standing in each
     of the jurisdictions within the United States where ownership of its
     properties or the conduct of its business requires such registration,
     qualification or licensing, except in all cases where the failure to be so
     registered, qualified or licensed would not reasonably be expected to have
     a Material Adverse Effect.  LCR also has all power and authority,
     governmental permits, licenses, consents, authorizations, orders and
     approvals and other authorizations as are necessary to carry on its
     business substantially as presently conducted except in all cases where the
     failure to have any of the foregoing would not reasonably be expected to
     have a Material Adverse Effect.

          (3)    Each of Equistar and Methanol is a limited partnership duly
     formed, validly existing and in good standing under the laws of the State
     of Delaware and, where applicable, is registered, qualified or licensed (or
     has applied for such registration, qualification or licensing) to do
     business and is in good standing in each of the jurisdictions within the
     United States where ownership of its properties or the conduct of its
     business requires such registration, qualification 

                                      48
<PAGE>
 
     or licensing, except in all cases where the failure to be so registered,
     qualified or licensed would not reasonably be expected to have a Material
     Adverse Effect. Each of Equistar and Methanol also has all power and
     authority, governmental permits, licenses, consents, authorizations, orders
     and approvals and other authorizations as are necessary to carry on its
     business substantially as presently conducted except in all cases where the
     failure to have any of the foregoing would not reasonably be expected to
     have a Material Adverse Effect.

          (l)  The Borrower is not an "investment company" within the meaning of
     the Investment Company Act of 1940, as amended, or a "public-utility
     company" or a "holding company" within the meaning of the Public Utility
     Holding Company Act of 1935 or a "public utility" under the laws of the
     State of Texas.

          (m)  Except as described in the Borrower's 1996 Form 10-K or any
     subsequent '34 Act Report or as otherwise disclosed in writing to the
     Administrative Agent and delivered to the Banks, to the best of its
     knowledge (i) the Borrower and each of its Consolidated Subsidiaries
     possess all environmental, health and safety licenses, permits,
     authorizations, registrations, approvals and similar rights necessary for
     the Borrower or such Consolidated Subsidiary to conduct its operations as
     now being conducted, except where the failure to possess or maintain any of
     the foregoing would not reasonably be expected to have a Material Adverse
     Effect and (ii) the Borrower and each of its Consolidated Subsidiaries are
     in compliance with all terms, conditions or other provisions of such
     licenses, permits, authorizations, registrations, approvals and similar
     rights, except for such failure or noncompliance that would not reasonably
     be expected to have a Material Adverse Effect.

          (n)  Except as described in the Borrower's 1996 Form 10-K or any
     subsequent '34 Act Report or as otherwise disclosed in writing to the
     Administrative Agent and delivered to the Banks, to the best of its
     knowledge, there does not exist any Release of a Hazardous Material or any
     violation of the Requirements of Environmental Laws that reasonably would
     be expected to impose a liability on the Borrower or a Consolidated
     Subsidiary, or require an expenditure by the Borrower or a Consolidated
     Subsidiary to cure such violation, in any case where such liability or
     expenditure would reasonably be expected to have a Material Adverse Effect.

          (o)  Each of the Borrower and its Consolidated Subsidiaries has filed
     all federal income tax returns and other material tax returns, statements
     and reports (or obtained extensions with respect thereto) which are
     required to be filed and have paid or deposited or made adequate provision
     in accordance with generally accepted accounting standards for the payment
     of all taxes (including 

                                      49
<PAGE>
 
     estimated taxes shown on such returns, statements and reports) which are
     shown to be due pursuant to such returns.

          (p)  Each of the LCR Regulations, the Equistar Partnership Agreement
     and the Methanol Partnership Agreement is in full force and effect.

          (q)  LRC is not in default of its material obligations under the LCR
     Regulations; none of the Lyondell Equistar Partners is in default of its
     material obligations under the Equistar Partnership Agreement; and neither
     Lyondell Methanol GP nor Lyondell Methanol LP is in default of its material
     obligations under the Methanol Partnership Agreement.

          (r)  On the date of this Agreement, the Borrower has no Restricted
Subsidiaries.

                                   ARTICLE V

                                   COVENANTS

     The Borrower agrees that, so long as any Bank has any Commitment hereunder
or any amount payable under any Note or in respect of any Letter of Credit
remains unpaid:

      SECTION 5.01.   Certain Information to be Furnished by the Borrower.  The
                      ---------------------------------------------------      
Borrower will deliver to the Administrative Agent and the Administrative Agent
shall promptly deliver to the Banks:

          (a)(1) as soon as available and in any event within 120 days after the
     end of each of its fiscal years, the consolidated balance sheet of the
     Borrower and its Consolidated Subsidiaries as of the end of such fiscal
     year and the related consolidated statements of income and cash flows for
     such year, setting forth in each case in comparative form the figures for
     the previous fiscal year, together with the audit report thereon of a
     nationally recognized firm of independent certified public accountants;

          (2)    as soon as available and in any event within 120 days after the
     end of each of its fiscal years, the balance sheet of LCR as of the end of
     such fiscal year and the related statements of income and cash flows for
     such year, setting forth in each case in comparative form the figures for
     the previous fiscal year, together with an audit report thereon of a
     nationally recognized firm of independent certified public accountants;

                                      50
                                        
<PAGE>
 
          (3)    as soon as available and in any event within 120 days after the
     end of each of its fiscal years, the balance sheet of Equistar as of the
     end of such fiscal year and the related statements of income, cash flows
     and partners' equity for such year, setting forth in each case (commencing
     with its fiscal year ending December 31, 1998) in comparative form the
     figures for the previous fiscal year, together with an audit report thereon
     of a nationally recognized firm of independent certified public
     accountants;

          (4)    as soon as available and in any event within 120 days after the
     end of each of its fiscal years, the unaudited balance sheet of Methanol as
     of the end of such fiscal year and the related statement of income for such
     year, setting forth in each case (commencing with its fiscal year ending
     December 31, 1998) in comparative form the figures for the previous fiscal
     year;

          (b)(1) as soon as available and in any event within 60 days after the
     end of each of the first three quarters of each of its fiscal years, (i)
     the consolidated balance sheet of the Borrower and its Consolidated
     Subsidiaries as of the end of such fiscal quarter, (ii) the related
     consolidated statement of income for such fiscal quarter and for the
     portion of the fiscal year ended with such quarter and (iii) the related
     consolidated statements of income and cash flows for the portion of the
     fiscal year ended with such quarter, setting forth, with respect to (iii),
     in comparative form the figures for the corresponding portion of the
     Borrower's previous fiscal year, all certified (subject to normal year-end
     adjustments and not including footnotes or schedules required by generally
     accepted accounting principles) by the chief financial officer or the chief
     accounting officer of the Borrower to present fairly, in all material
     respects, the financial position, results of operations and cash flows of
     the Borrower and its Consolidated Subsidiaries in accordance with generally
     accepted accounting principles (except as otherwise stated therein) applied
     on a basis consistent with the financial statements referred to in
     paragraph (a)(1) of this Section;

          (2)    as soon as available and in any event within 60 days after the
     end of each of the first three quarters of each of its fiscal years, (i)
     the balance sheet of LCR as of the end of such fiscal quarter, (ii) the
     related statement of income for such fiscal quarter and for the portion of
     the fiscal year ended with such quarter and (iii) the related statements of
     income and cash flows for the portion of the fiscal year ended with such
     quarter, setting forth, with respect to (iii), in comparative form the
     figures for the corresponding portion of LCR's previous fiscal year, all
     certified (subject to normal year-end adjustments and not including
     footnotes or schedules required by generally accepted accounting
     principles) by the chief financial officer or the chief accounting officer
     of LCR to present fairly, in all material respects, the financial position,
     results of operations and cash flows of LCR in accordance with generally
     accepted

                                      51
<PAGE>
 
     accounting principles (except as otherwise stated therein) applied on a
     basis consistent with the financial statements referred to in paragraph
     (a)(2) of this Section;

          (3)  as soon as available and in any event within 60 days after the
     end of each of the first three quarters of each of its fiscal years, (i)
     the balance sheet of Equistar as of the end of such fiscal quarter, (ii)
     the related statement of income for such fiscal quarter and for the portion
     of the fiscal year ended with such quarter and (iii) the related statements
     of income and cash flows and partners' equity for the portion of the fiscal
     year ended with such quarter, setting forth, with respect to (iii),
     commencing with its fiscal quarter ending March 31, 1999, in comparative
     form the figures for the corresponding portion of Equistar's previous
     fiscal year, all certified (subject to normal year-end adjustments and not
     including footnotes or schedules required by generally accepted accounting
     principles) by the chief financial officer or the chief accounting officer
     of Lyondell Equistar GP to present fairly, in all material respects, the
     financial position, results of operations, cash flows and partners' equity
     of Equistar in accordance with generally accepted accounting principles
     (except as otherwise stated therein) applied on a basis consistent with the
     financial statements referred to in paragraph (a)(3) of this Section;

          (4)  at such time as the Borrower causes to be prepared routinely on a
     quarterly basis financial statements for Methanol, promptly after the
     preparation thereof after the end of each of the first three quarters of
     each of Methanol's fiscal years thereafter, (i) the balance sheet of
     Methanol as of the end of such fiscal quarter, (ii) the related statement
     of income for such fiscal quarter and for the portion of the fiscal year
     ended with such quarter and (iii) the related statement of income for the
     portion of the fiscal year ended with such quarter, which financial
     statements shall set forth with respect to (iii) (commencing with any such
     financial statements prepared after December 31, 1997), in comparative form
     the figures for the corresponding portion of Methanol's previous fiscal
     year, all certified (subject to normal year-end adjustments and not
     including footnotes or schedules required by generally accepted accounting
     principles) by the chief financial officer or the chief accounting officer
     of Lyondell Methanol GP to present fairly, in all material respects, the
     financial position and results of operations of Methanol in accordance with
     generally accepted accounting principles (except as otherwise stated
     therein) applied on a basis consistent with the financial statements
     referred to in paragraph (a)(4) of this Section;

          (c)  promptly after the same are sent to shareholders or filed, copies
     of all (i) financial statements, notices, reports and proxy materials sent
     by the Borrower to shareholders of the Borrower and (ii) registration
     statements (other 

                                      52
<PAGE>
 
     than exhibits thereto and any registration statements on Form S-8 or its
     equivalent) and reports on Form 10-K, 10-Q and 8-K (or their equivalents)
     filed by the Borrower with the Securities and Exchange Commission (or any
     governmental agency succeeding to the functions of such Commission);

          (d)  simultaneously with the delivery of the financial statements
     referred to in paragraphs (a) and (b) above, (i) a certificate of the
     Borrower signed by the Treasurer or any Assistant Treasurer of the Borrower
     stating whether there exists to the knowledge of such officer of the
     Borrower on the date of such certificate any Default, and, if any such
     Default then exists, specifying the nature and period of existence thereof
     and the action the Borrower is taking or is causing to be taken and
     proposes to take or cause to be taken with respect thereto and (ii) a
     certificate of the Borrower signed by the Treasurer or any Assistant
     Treasurer of the Borrower stating that the Borrower is in compliance with
     the provisions of Section 5.08 and setting forth all computations relating
     thereto;

          (e)  forthwith, if at any time any officer of the Borrower shall
     obtain knowledge of any Default, a certificate of the Treasurer or any
     Assistant Treasurer specifying the nature and period of existence thereof
     and the action the Borrower is taking or is causing to be taken and
     proposes to take or cause to be taken with respect thereto;

          (f)  promptly upon obtaining knowledge thereof, a copy of each of the
     following notices:  if and when any member of the Controlled Group (i)
     gives or is required to give notice to the PBGC of any "reportable event"
     (as defined in Section 4043 of ERISA) with respect to any Plan which might
     reasonably be expected to constitute grounds for a termination of such Plan
     under Title IV of ERISA, or knows that the plan administrator of any Plan
     has given or is required to give notice of any such reportable event, a
     copy of the notice of such reportable event given or required to be given
     to the PBGC; (ii) receives notice of complete or partial withdrawal
     liability under Title IV of ERISA, a copy of such notice; or (iii) receives
     notice from the PBGC under Title IV of ERISA of an intent to terminate or
     appoint a trustee to administer any Plan, a copy of such notice;

          (g)  in the event of any damage, loss or casualty to or destruction of
     any portion of any facility of the Borrower, any of its Subsidiaries, LCR,
     Equistar, Methanol or any Other Equity Person, prompt notice thereof,
     specifying the nature and extent of such damage, loss, casualty or
     destruction and stating whether such damage, loss, casualty or destruction,
     in the reasonable judgment of the Borrower, materially adversely affects
     the production capacity of such facility or the economic value of such
     facility;

                                      53
<PAGE>
 
     provided, however, that the Borrower shall have no obligation to deliver
     --------  -------
     such notice if the damage to the facility in the good faith judgment of the
     Borrower will not cost in excess of $15,000,000 to rebuild, replace or
     restore or if such damage does not materially adversely affect such
     production capacity or the economic value of the facility;

          (h)  in the event of any total or partial shutdown of any production
     or storage facility of the Borrower, any of its Consolidated Subsidiaries,
     LCR, Equistar, Methanol or any Other Equity Person in connection with any
     Release, prompt notice thereof to the Administrative Agent, specifying the
     reason for such shutdown; provided, however, that the Borrower shall have
                               --------  -------
     no obligation to deliver such notice if in the good faith judgment of the
     Borrower such shutdown will not result in a reduction of the combined
     Consolidated Net Income of the Borrower, LCR, Equistar, Methanol and each
     Other Equity Person of $10,000,000 or more over a period of five years
     beginning with the date of such shutdown;

          (i)  in addition to its obligations pursuant to Section 2.02, prompt
     written notice of any Debt of the Borrower, other than Borrowings, incurred
     subsequent to the date of this Agreement; and

          (j)  from time to time such further information regarding compliance
     with this Agreement or the business, operations, affairs, assets, condition
     (financial or otherwise) or results of operations of the Borrower and its
     Consolidated Subsidiaries, LCR, Equistar, Methanol and Other Equity Persons
     as the Administrative Agent, at the request of any Bank, may reasonably
     request.

     SECTION 5.02.   Maintenance of Property; Insurance.
                     ---------------------------------- 

     (a)  The Borrower will keep, and will cause each of its Subsidiaries to
keep, all property useful and necessary in its business in good working order
and condition, ordinary wear and tear excepted.

     (b)  The Borrower will, and will cause each of its Subsidiaries to,
maintain insurance consistent either with the insurance practices of the
Borrower and its Subsidiaries in effect on the date hereof, or with then
existing industry practice, in either case to the extent available to the
Borrower and its Subsidiaries on commercially reasonable terms, and will furnish
to the Administrative Agent, upon request from the Administrative Agent,
information presented in reasonable detail as to the insurance so carried.

     SECTION 5.03.   Limitation on Liens.  Except as otherwise specifically
                     -------------------                                   
provided in this Agreement, nothing contained in this Agreement shall in any way
restrict or 

                                      54
<PAGE>
 
prevent the Borrower or any Subsidiary from incurring any Debt; provided,
                                                                --------
however, that neither the Borrower nor any Restricted Subsidiary will issue,
- -------
assume or incur any Debt secured by any Lien upon any Restricted Property or
grant any Lien on any such Restricted Property to secure any such Debt without
effectively providing that all of the Notes and the Letter of Credit
Outstandings (together with, if the Borrower so determines, any other Debt then
existing and any other Debt thereafter created ranking equally with the Notes)
shall be secured equally and ratably with (or prior to) such Debt so long as
such Debt shall be so secured. To the extent, if any, that the following Liens
would otherwise be prohibited by the foregoing provisions, the foregoing
provisions shall not apply to:

     (a)  Liens on any property of a corporation or other Person existing at the
time it becomes a Subsidiary or at the time it is merged into or consolidated
with the Borrower or a Subsidiary and not created in contemplation of such
event;

     (b)  Liens on any assets (i) existing at the time of acquisition thereof
and not created in contemplation of such event or (ii) incurred to secure
payment of all or part of the purchase price thereof or (iii) incurred to secure
Debt incurred prior to, at the time of or within 120 days after acquisition
thereof for the purpose of financing all or part of the purchase price thereof;

     (c)  Liens on property of the Borrower or any of its Subsidiaries existing
or contemplated on the date hereof and listed on Schedule 5.03(c);

     (d)  Liens on any new plant (including any processing unit or production or
storage facility) or the real estate on which such plant is situated or is to be
constructed securing Debt incurred or assumed either (i) at the time of or
within 24 months after commencement of improvement or construction or (ii)
within 120 days after completion of improvement or construction of such plant in
a principal amount not exceeding the cost of such improvement or construction
and the cost of acquisition of such plant and such real estate;

     (e)  Liens which secure only Debt owing by a Subsidiary to the Borrower or
another Subsidiary;

     (f)  Liens in favor of the United States of America or any state thereof or
any department, agency, instrumentality or political subdivision of any such
jurisdiction to secure partial, progress, advance or other payments pursuant to
any contract or statute or to secure any Debt incurred for the purpose of
financing all or any part of the purchase price or cost of constructing or
improving the property subject to such Lien, including, without limitation,
Liens to secure Debt of the pollution control or industrial revenue bond type;

                                      55
<PAGE>
 
     (g)  Liens required by any contract or statute in order to permit the
Borrower or a Subsidiary to perform any contract or subcontract made by it with
or at the request of the United States of America, any state or any department,
agency or instrumentality or political subdivision of either; or

     (h)  Liens securing taxes, assessments, governmental charges or levies,
statutory Liens of landlords and Liens of carriers, warehousemen, materialmen,
mechanics and other like Persons not yet due or the payment of which is not then
required; provided, however, that this paragraph (h) shall not be deemed to
          --------  -------                                                
permit any Liens which may be imposed pursuant to Section 4068 of ERISA;

     (i)  Liens of or resulting from any judgment or award not in excess of
$25,000,000, the time for the appeal or petition for rehearing of which shall
not have expired, or in respect of which the obligor shall at any time in good
faith be prosecuting an appeal or proceeding for a review and in respect of
which a stay of execution pending such appeal or proceeding for review shall
have been secured;

     (j)  Liens incurred or deposits made in the ordinary course of business (i)
in connection with workers' compensation, unemployment insurance and other types
of social security, or (ii) to secure reimbursement obligations in respect of
documentary letters of credit secured by collateral customarily and normally
provided to banks issuing documentary letters of credit; provided, however, that
                                                         --------  -------      
any obligation secured by any such Lien shall not be overdue or, if overdue, is
being contested in good faith by appropriate actions or proceedings during which
there is no right to exercise remedies and with respect to which adequate book
reserves are maintained to the extent required by generally accepted accounting
principles; provided further, that paragraph (j) shall not be deemed to permit
            -------- -------                                                  
any Liens which may be imposed pursuant to Section 4068 of ERISA;

     (k)  minor survey exceptions and minor encumbrances, easements or
reservations, or rights of others for rights-of-way, utilities and other similar
purposes, or zoning or other restrictions as to the use of real properties,
which are necessary for the conduct of the activities of Borrower or any
Subsidiary or which customarily exist on properties of corporations or other
Persons engaged in similar activities and similarly situated;

     (l)  any extension, renewal or replacement (or successive extensions,
renewals or replacements), in whole or in part, of any Lien referred to in the
foregoing paragraphs (a) to (k) inclusive or of any Debt secured thereby,
provided that the principal amount of Debt secured thereby shall not exceed the
principal amount of Debt so secured at the time of such extension, renewal or
replacement, and that such extension, renewal or replacement Lien shall be
limited to all or part of substantially 

                                      56
<PAGE>
 
the same property which secured the Lien extended, renewed or replaced, plus
improvements on such property;


provided, however, that the Borrower and any one or more Restricted Subsidiaries
- --------  -------
may issue, assume or incur Debt secured by Liens which would otherwise be
subject to the foregoing restrictions or grant any such Lien to secure any such
Debt in an aggregate principal amount which, together with the aggregate
outstanding principal amount of all Debt of the Borrower and the Restricted
Subsidiaries which would otherwise be subject to the foregoing restrictions (not
including Debt permitted to be secured under paragraphs (a) to (l) inclusive
above), does not at any one time exceed the greater of $50,000,000 or 10 percent
of Consolidated Net Tangible Assets of the Borrower and its Consolidated
Subsidiaries.

     SECTION 5.04.   Consolidation, Merger, Disposition of Assets.  (a)
                     --------------------------------------------       
Subject to the provisions of Section 5.04(b), nothing contained in this
Agreement shall prevent any consolidation or merger of the Borrower with or into
any other entity or entities (whether or not an Affiliate of the Borrower), or
successive consolidations or mergers in which the Borrower or its successor or
successors shall be a party or parties, or shall prevent any sale or conveyance
of all the property and assets of the Borrower substantially as an entirety, to
any other Person (whether or not an Affiliate of the Borrower) authorized to
acquire and operate the same; provided, however, that upon any such
                              --------  -------                    
consolidation, merger, sale or conveyance, other than a consolidation or merger
in which the Borrower is the continuing entity, the surviving entity must be
chartered under the laws of the United States or one of its states and the due
and punctual payment of the principal of and interest on all of the Notes,
according to their tenor, and the due and punctual performance and observance of
all of the covenants and conditions of this Agreement, shall be expressly
assumed by instrument reasonably satisfactory in form to the Required Banks and
executed and delivered to the Administrative Agent by the corporation (if other
than the Borrower) formed by such consolidation or into which the Borrower shall
have been merged or by the Person which shall have acquired such property; and
provided further, that no Default or Event of Default shall exist hereunder
- -------- -------                                                           
after giving effect to such consolidation, merger or sale of assets.
Notwithstanding the foregoing, the provisos of this Section 5.04(a) shall not
apply to the direct or indirect transfer by the Borrower to Equistar of the
properties and assets of the Borrower described in the Joint Proxy Statement.

     (b)  If, upon any consolidation or merger of the Borrower with or into any
other corporation, or upon the sale or conveyance of all the property and assets
of the Borrower substantially as an entirety to any other Person or if any of
the remaining property of the Borrower or of any Restricted Subsidiary would
thereupon become subject to any Lien, the Borrower, prior to or simultaneously
with such consolidation, merger, sale or conveyance, will secure the Notes, the
Letter of Credit Outstandings and all other obligations of the Borrower under
this Agreement equally and ratably with

                                      57
<PAGE>
 
any other obligations of the Borrower (or any Restricted Subsidiary if
applicable) then entitled thereto, by a direct Lien on all such property prior
to all Liens other than any theretofore existing thereon.

     SECTION 5.05.   Use of Proceeds.  The proceeds of the Loans made and
                     ---------------                                     
Letters of Credit issued under this Agreement will be used by the Borrower and
its Subsidiaries for general business purposes; provided, however, without the
                                                -----------------             
prior consent of the Required Lenders, the Borrower and its Subsidiaries will
not acquire in one or more transactions operating assets with proceeds of Loans
aggregating more than $75,000,000.  No proceeds of any Loan will be used in
violation of Regulation U, Regulation X, Regulation G or of any similar laws or
regulations relating to Debt secured directly or indirectly by equity
securities.

     SECTION 5.06.   Payment of Taxes.  The Borrower will, and will cause each
                     ----------------                                         
Consolidated Subsidiary to, pay and discharge, or make adequate provision for,
all material taxes, assessments and governmental charges or levies imposed upon
it or upon its income or profits, or upon any properties belonging to it;
provided, however, that neither the Borrower nor any Consolidated Subsidiary
- --------  -------                                                           
shall be required to pay or discharge or cause to be paid or discharged any such
taxes, assessments, charges or levies whose amount, applicability or validity is
being contested in good faith by appropriate actions or proceedings and as to
which reserves have been established if required by generally accepted
accounting principles.

     SECTION 5.07.   LCR Matters.
                     ------------

     (a)  The Borrower will not permit LRC, as an Owner of LCR, to consent to
any amendment or modification to the LCR Regulations, or to take any other
action, that would in each case result in LRC's Participation Percentage (as
defined in the LCR Regulations) to be less than 50 percent, without the consent
of Banks having at least 70 percent of the aggregate Commitments.

     (b)  Unless the Banks having at least 70 percent of the aggregate
Commitments agree otherwise, the Borrower shall cause LRC (within the bounds of
good business judgment and its legal obligations under or in connection with the
LCR Regulations), as an Owner of LCR, to withhold its consent, which is required
under Section 3.8 of the LCR Regulations, with respect to any action that would
cause or permit LCR (or any Person acting in the name or on behalf of LCR),
directly or indirectly, to undertake any of the following:

          (1)  to fail to maintain insurance consistent either with the
     insurance practices of the Borrower and its Subsidiaries in effect on the
     date hereof or with then existing industry practice, in either case to the
     extent available to LCR on commercially reasonable terms; and

                                      58
<PAGE>
 
          (2)  to amend, or alter the LCR Regulations in any way that would
     materially adversely affect (i) the Borrower's access to its share of
     distributable cash from LCR or (ii) other material rights and obligations
     of the Borrower or LRC under the LCR Regulations (including without
     limitation materially increasing an obligation of the Borrower or LRC to
     make contributions to LCR or materially decreasing an obligation of CITGO
     or CITGO Refining to make contributions to LCR), provided, however, that in
                                                      --------  -------         
     any event the Borrower will provide promptly thereafter to the
     Administrative Agent notice and copies of all amendments to the LCR
     Regulations.

     SECTION 5.08   Equistar Matters.  Unless the Banks having at least 70
                    ----------------                                      
percent of the aggregate Commitments agree otherwise, the Borrower shall cause
each of the Lyondell Equistar Partners (within the bounds of good business
judgment and its legal obligations under or in connection with the Equistar
Partnership Agreement), as partners of Equistar, to withhold its consent, which
is required under Section 6.7 or Section 13.23 of the Equistar Partnership
Agreement, with respect to any action that would cause or permit Equistar (or
any Person acting in the name or on behalf of Equistar), directly or indirectly,
to undertake any of the following:

          (a)  to fail to maintain insurance consistent either with the
     insurance practices of the Borrower and its Subsidiaries (including such
     insurance coverage for Methanol) in effect on the date hereof or with then
     existing industry practice, in either case to the extent available to
     Equistar on commercially reasonable terms; and

          (b)  to amend, or alter the Equistar Partnership Agreement in any way
     that would materially adversely affect (i) the Borrower's access to its
     share of distributable cash from Equistar or (ii) other material rights and
     obligations of the Borrower or the Lyondell Equistar Partners under the
     Equistar Partnership Agreement (including, without limitation, materially
     increasing an obligation of the Borrower or the Lyondell Equistar Partners
     to make contributions to Equistar or materially decreasing an obligation of
     the Millennium Equistar Partners to make contributions to Equistar),
     provided, however, that in any event the Borrower will provide promptly
     --------  -------
     thereafter to the Administrative Agent notice and copies of all amendments
     to the Equistar Partnership Agreement.

     SECTION 5.09.   Financial Covenants.   The Borrower will comply with the
                     --------------------                                    
covenants described in this Section.

     (a)  Debt Incurrence Test.  If at any time the aggregate outstanding
          --------------------                                           
principal amount of the Loans exceeds $50,000,000, then the Borrower will not be
permitted to make any additional Borrowings hereunder (other than Borrowings
constituting conversions and continuations pursuant to Article II) unless, after
giving effect to any 

                                      59
<PAGE>
 
such Borrowing, (i) the ratio of Global Debt to Stub Period Global EBITDA, for
the four-fiscal-quarter period of the Borrower ended September 30, 1997, if such
Borrowing will be made at any time prior to the first Determination Date, or
(ii) the ratio of Global Debt to Global EBITDA, for the four-fiscal-quarter
Period of the Borrower most recently ended after September 30, 1997, if such
Borrowing will be made on or after the first Determination Date, in each case,
is less than or equal to 3.75 to 1.0; provided, however, that each such
                                      --------  -------
determination shall be made by giving effect to (A) all Global Debt actually
outstanding during any portion of such four-fiscal-quarter period and by
assuming that such proposed Borrowing had been incurred on the first day of such
four-fiscal-quarter period and (B) all operating assets acquired during such
four-fiscal-quarter period and by assuming that such assets were acquired on the
first day of such four-fiscal-quarter period.

     (b)  Fixed Charge Coverage Ratio.  The Borrower will not permit, as of the
          ---------------------------                                          
end of any fiscal quarter, the ratio of (i) Consolidated Cash Flow, minus
Consolidated Capital Expenditures of the Borrower, to (ii) Consolidated Interest
Expense of the Borrower, in each case for the four-fiscal-quarter period most
recently ended, to be less than 3.0 to 1.0.

     (c)  Leverage.  (i) The Borrower will not permit, as of the end of any
          --------                                                         
fiscal quarter, the ratio of Consolidated Debt of the Borrower to Consolidated
Cash Flow, computed in each case for the four-fiscal-quarter period most
recently ended, to be greater than 2.0 to 1.0.

          (ii) The Borrower will not permit, as of the end of any fiscal
quarter, the ratio of Consolidated Debt of the Borrower to Total Capitalization
to be greater than 0.5 to 1.0.

     (d)  Dividend Payments.  The Borrower will not at any time declare, make or
          -----------------                                                     
pay, or incur any liability to make or pay, or cause or permit to be declared,
made or paid any Dividend unless at the time of declaring such Dividend, and
after giving effect thereto, the aggregate amount of all such Dividends declared
or paid on or after January 1, 1998 shall not exceed an amount equal to the sum
of (i) $50,000,000, plus (ii) 75 percent of Consolidated Net Income or Loss of
the Borrower, excluding non-cash Non-Operating Special Items used in determining
Consolidated Net Income or Loss, for the period commencing January 1, 1998 and
ending with the most recently completed fiscal quarter of the Borrower (treated
as a single accounting period).

     (e)  Methodology for Determining Covenant Compliance.  Notwithstanding any
          ------------------------------------------------                     
     contrary provision of this Agreement, the Borrower's compliance with each
     of the covenants described in this Section shall be determined in
     accordance with the following methodology:

                                      60
                                      
<PAGE>
 
          (1)  In the event the Borrower, LCR, Equistar, Methanol or any Other
     Equity Person issues Debt ("Replacement Debt") for the purpose of
     refinancing Debt outstanding under any of such Person's public indentures
     or medium-term note programs ("Replaced Debt"), the aggregate principal
     amount of such Replacement Debt shall be substituted in place of the
     Replaced Debt for purposes of all determinations and the calculations, in
     paragraphs (a) and (c) of this Section; provided, however, that the Net
                                             --------  -------              
     Interest associated with such Replacement Debt of the Borrower shall be
     included in Interest Expense of the Borrower for purposes of the
     calculation in paragraph (b) of this Section; and further provided, that
                                                       ------- --------      
     the treasurer of the Borrower shall certify to the Administrative Agent
     that such Replacement Debt will be used to refinance Replaced Debt.

          (2)  The results of operations for, and all information pertaining to,
     the Borrower's most recently completed quarter or four fiscal quarter
     period, as applicable, shall be determined based upon the last quarter, or
     the four fiscal quarter period (the last quarter of which is the most
     recent quarter), for which the Borrower made a public announcement of its
     Consolidated Net Income or Loss.

     Section 5.10.   No Subsidiary Debt.   The Borrower will not permit any of
                     ------------------                                       
LRC, the Lyondell Equistar Partners, Lyondell Methanol GP or Lyondell Methanol
LP to incur, issue, create, assume or permit to exist any Debt; provided,
however, the foregoing prohibition will not apply to the Equistar Debt or any
obligation of such Person in respect of LRC, Equistar or Methanol, as the case
may be, by reason of that Person's legal status as an Owner of LCR or a partner
of Equistar or Methanol, as the case may be.

     Section 5.11.   Disposition of Interests in Subsidiaries.  The Borrower
                     ----------------------------------------               
shall not convey, sell, assign, transfer, pledge or otherwise dispose of any of
its equity interests in any of LRC, the Lyondell Equistar Partners, Lyondell
Methanol GP or Lyondell Methanol LP; provided, however, the foregoing
prohibition shall not apply if, after giving effect to any such disposition, the
aggregate amount of Net Cash Proceeds (as such term is hereinafter defined) from
all such dispositions actually received by the Borrower therefrom since the date
of this Agreement does not exceed $100,000,000 or, if the aggregate amount of
Net Cash Proceeds does exceed $100,000,000 (such excess Net Cash Proceeds being
the "Excess Proceeds"), concurrently with the receipt of those Excess Proceeds
from time to time, the Borrower reduces the Commitment Amount by an amount equal
to 80% of the Excess Proceeds so received. Any reduction of the Commitments
shall apply proportionately to the Commitment of each Bank in accordance with
its Commitment Percentage and any such reduction shall be permanent.  For
purposes of this Section 5.11, "Net Cash Proceeds" means the sum of all cash
(including all installments under any note when received) received in 

                                      61
<PAGE>
 
connection with any such disposition, minus all reasonable fees, expenses and
other costs incurred by the Borrower in connection with such disposition.

                                  ARTICLE VI

                             DEFAULTS AND REMEDIES

      SECTION 6.01.   Defaults.  If one or more of the following events (herein
                      --------                                                 
called "Events of Default") shall occur and be continuing:

          (a)  the Borrower shall default in the payment when due of any
     principal of any Loan or any reimbursement obligation in respect of any
     Letter of Credit, or shall default in the payment within five days after
     the due date thereof of any interest on any Loan or any other amount
     payable hereunder;

          (b)  the Borrower shall fail to perform or observe any covenant or
     agreement to be performed by it contained in Section 5.01(e), Section
     5.02(b) or Sections 5.03 through 5.09;

          (c)  the Borrower shall fail to perform or observe any covenant or
     agreement to be performed by it contained in this Agreement (other than
     those covered by paragraphs (a) or (b) above) for 30 consecutive days after
     written notice of such failure is given to the Borrower by the
     Administrative Agent at the request of any Bank;

          (d)  the Borrower shall have made, or be deemed to have made pursuant
     to Section 3.02, any representation or warranty in this Agreement or in any
     certificate or other document delivered pursuant hereto or in respect of
     any financial statement delivered pursuant hereto, which shall prove to
     have been incorrect in any material respect when so made or deemed to have
     been made;

          (e)  the Borrower or any of its Subsidiaries shall fail to pay any
     indebtedness for borrowed money (other than the Loans or any reimbursement
     obligation in respect of any Letters of Credit) payable or Guaranteed by
     it, or any interest or premium thereon, when due (whether by scheduled
     maturity, required prepayment, acceleration, demand or otherwise) and such
     failure shall continue after the applicable grace period, if any, specified
     in the agreement or instrument relating to such Debt or Guarantee;
     provided, however, that the aggregate amount of such Debt or Guaranteed
     --------  -------                                                      
     Debt, including any accrued and unpaid interest or premium thereon, shall
     exceed $15,000,000;

                                      62
<PAGE>
 
          (f)  LRC shall be determined (upon exhaustion of all appeals and
     expiration of all cure periods as provided in the LCR Regulations) to be in
     default of any of its material obligations pursuant to the LCR Regulations
     or the Lyondell Equistar Partners shall be determined (upon exhaustion of
     all appeals and expiration of all cure periods as provided in the Equistar
     Partnership Agreement) to be in default of any of their material
     obligations pursuant to the Equistar Partnership Agreement;

          (g)  the Borrower, any Restricted Subsidiary, LCR or Equistar shall
     commence a voluntary case or other proceeding seeking liquidation,
     reorganization or other relief with respect to itself or its debts under
     any bankruptcy, insolvency or other similar law now or hereafter in effect
     or seeking the appointment of a trustee, receiver, liquidator, custodian or
     other similar official of it or any substantial part of its property, or
     shall consent to any such relief or to the appointment of or taking
     possession by any such official in an involuntary case or other proceeding
     commenced against it, or shall make a general assignment for the benefit of
     creditors, or shall take any corporate action to authorize any of the
     foregoing, or shall fail generally to pay its debts as they become due, or
     shall admit in writing its inability to pay its debts as they become due;

          (h)  an involuntary case or other proceeding shall be commenced
     against the Borrower, any Restricted Subsidiary, LCR or Equistar seeking
     liquidation, reorganization or other relief with respect to it or its debts
     under any bankruptcy, insolvency or other similar law now or hereafter in
     effect or seeking the appointment of a trustee, receiver, liquidator,
     custodian or other similar official of it or any substantial part of its
     property, and such involuntary case or other proceeding shall remain
     undismissed and unstayed for a period of 60 days; or an order for relief
     shall be entered against the Borrower, any Restricted Subsidiary, LCR or
     Equistar under the federal bankruptcy laws as now or hereafter in effect;

          (i)  any member of the Controlled Group shall fail to pay when due an
     amount or amounts aggregating in excess of $25,000,000 which it shall have
     become liable to pay to the PBGC or to a Plan under Title IV of ERISA; or
     the PBGC shall institute proceedings under Title IV of ERISA to terminate
     or to cause a trustee to be appointed to administer any Material Plan or a
     proceeding shall be instituted by a fiduciary of any Material Plan against
     any member of the Controlled Group to enforce Section 515 of ERISA and such
     proceeding shall not have been dismissed within 90 days thereafter;

          (j)  a final, non-appealable judgment or order for the payment of
     money in excess of $15,000,000 shall be rendered against the Borrower, any

                                      63
<PAGE>
 
     Restricted Subsidiary, LCR or Equistar and such judgment or order shall
     continue unsatisfied for a period of 30 days;

     then, and without notice upon the occurrence of an Event of Default
     specified in Section 6.01(g) or Section 6.01(h), or, by notice to the
     Borrower upon the occurrence and during the continuation of any other Event
     of Default, the Administrative Agent may and, upon the written request of
     the Required Banks shall, take any or all of the following actions: (i)
     declare the Banks' Commitments terminated, whereupon the Commitments of the
     Banks shall forthwith terminate immediately and any accrued and unpaid
     Facility Fee shall forthwith become due and payable without any other
     notice of any kind; (ii) declare the principal of and any accrued and
     unpaid interest in respect of all Loans and all Obligations owing
     hereunder, to be, whereupon the same shall become, forthwith due and
     payable without further presentment, demand, notice of demand or of
     dishonor and non-payment, protest, notice of protest, notice of intent to
     accelerate, declaration or notice of acceleration or any other notice of
     any kind, all of which are hereby waived by the Borrower; and (iii) direct
     the Borrower to pay, and the Borrower agrees that upon receipt of such
     notice (or upon the occurrence of an Event of Default specified in Section
     6.01(g) or Section 6.01(h)), it will pay to the Administrative Agent such
     additional amount of cash as is equal to the aggregate Stated Amount of all
     Letters of Credit then outstanding to be held in an interest bearing
     account with the Administrative Agent, all such cash and interest to be
     held by the Administrative Agent as security for the Obligations of the
     Borrower hereunder and under the Notes and the other Loan Documents.

     SECTION 6.02.   Other Remedies.  Upon the occurrence and during the
                     --------------                                     
continuance of any Event of Default, the Administrative Agent, acting at the
request of the Required Banks, may proceed to protect and enforce its rights,
either by suit in equity or by action at law or both, or may proceed to enforce
the payment of all amounts owing to the Agents and the Banks under the Loan
Documents and interest thereon in the manner set forth herein or therein; it
being intended by the parties hereto that, to the maximum extent permitted by
applicable law, no remedy conferred herein or in any of the other Loan Documents
is to be exclusive of any other remedy and each and every remedy contained
herein or in any other Loan  Document shall be cumulative and shall be in
addition to every other remedy given hereunder and under the other Loan
Documents now or hereafter existing at law or in equity or by a statute or
otherwise.

     SECTION 6.03.   Rights of Setoff.  If any Event of Default shall have
                     ----------------                                     
occurred and be continuing, each Bank is hereby authorized at any time and from
time to time, to the fullest extent permitted by law, to set off and apply any
and all deposits (general or special, time or demand, provisional or final) at
any time held and other 

                                      64
<PAGE>
 
indebtedness at any time owing by such Bank, or any branch, subsidiary or
Affiliate of such Bank, to or for the credit or the account of the Borrower
against any and all the Obligations of the Borrower now or hereafter existing
under this Agreement and the other Loan Documents irrespective of whether or not
such Bank or the Administrative Agent shall have made any demand under this
Agreement, such Note, or the Obligations and although the Obligations may be
unmatured. Each Bank agrees promptly to notify the Borrower after any such
setoff and application made by such Bank, but the failure to give such notice
shall not affect the validity of such setoff and application. The rights of each
Bank under this Section are in addition to other rights and remedies (including
other rights of setoff) which such Bank may have.

                                  ARTICLE VII

                                  THE AGENTS

      SECTION  7.01.   Appointment and Authorization.  Each Bank irrevocably
                       -----------------------------                        
appoints and authorizes each of the Administrative Agent, the Documentation
Agent and the Auction Agent to take such action as Administrative Agent, the
Documentation Agent or the Auction Agent, as the case may be, on its behalf and
to exercise such powers under this Agreement and the Notes as are delegated to
the Administrative Agent, the Documentation Agent or the Auction Agent, as the
case may be, by the terms hereof or thereof, together with all such powers as
are reasonably incidental thereto.

      SECTION  7.02.   Agents and Affiliates.  Each of the Administrative Agent
                       ---------------------                                   
and the Documentation Agent shall have the same rights and powers under this
Agreement as any other Bank and may exercise or refrain from exercising the same
as though they were not the Agents, and its Affiliates may accept deposits from,
lend money to, and generally engage in any kind of business with the Borrower or
any Subsidiary or LCR or any Affiliate thereof as if they were not the Agents
hereunder.

      SECTION  7.03.   Action by Agents.  The obligations of the Administrative
                       ----------------                                        
Agent and the Auction Agent hereunder are only those expressly set forth herein.
Without limiting the generality of the foregoing, the Agents shall not be
required to take any action with respect to any Default, except as expressly
provided in Article VI.  The Documentation Agent shall have no duties or
obligations hereunder.

      SECTION  7.04.   Consultation with Experts.  The Agents may consult with
                       -------------------------                              
legal counsel, independent public accountants and other experts selected by it
and shall not be liable for any action taken or omitted to be taken by it in
good faith in accordance with the advice of such counsel, accountants or
experts.

                                      65
<PAGE>
 
     SECTION  7.05.   Liability of Agents.  NEITHER THE AGENTS NOR ANY OF THEIR
                      -------------------                                      
RESPECTIVE DIRECTORS, OFFICERS, AGENTS OR EMPLOYEES SHALL BE LIABLE TO ANY BANK
FOR ANY ACTION TAKEN OR NOT TAKEN BY THEM IN CONNECTION HEREWITH (I) WITH THE
CONSENT OR AT THE REQUEST OF THE REQUIRED BANKS OR (II) IN THE ABSENCE OF ITS
OWN GROSS NEGLIGENCE, UNLAWFUL ACT OR WILLFUL MISCONDUCT.  IT IS THE EXPRESS
INTENTION OF THE PARTIES HERETO THAT THE AGENTS, THEIR RESPECTIVE DIRECTORS,
OFFICERS, AGENTS OR EMPLOYEES SHALL BE INDEMNIFIED AND HELD HARMLESS BY THE
BANKS FROM ALL COSTS, EXPENSES (INCLUDING COUNSEL FEES AND DISBURSEMENTS)
CLAIMS, DEMANDS, ACTIONS, LOSSES OR LIABILITIES ARISING OUT OF THE NEGLIGENCE
(WHETHER SOLE OR CONTRIBUTORY) OF SUCH PERSONS.  Neither the Agents nor any of
their directors, officers, agents or employees shall be responsible for or have
any duty to ascertain, inquire into or verify (i) any statement, warranty or
representation made in connection with this Agreement or any Credit Event
hereunder; (ii) the performance or observance of any of the covenants or
agreements of the Borrower; (iii) the satisfaction of any condition specified in
Article III, except receipt of items required to be delivered to the
Administrative Agent; or (iv) the validity, effectiveness or genuineness of this
Agreement, the Notes or any other instrument or writing furnished in connection
herewith.  The Agents shall not incur any liability to any Bank by acting in
reliance upon any notice, consent, certificate, statement, or other writing
(which may be a bank wire, telex or similar writing) reasonably believed by it
to be genuine or to be signed by the proper party or parties.

     SECTION  7.06.   INDEMNIFICATION.  EACH BANK SHALL RATABLY IN ACCORDANCE
                      ---------------                                        
WITH ITS COMMITMENT, INDEMNIFY EACH OF THE AGENTS (TO THE EXTENT NOT REIMBURSED
BY THE BORROWER) AGAINST ANY COST, EXPENSE (INCLUDING COUNSEL FEES AND
DISBURSEMENTS), CLAIM, DEMAND, ACTION, LOSS OR LIABILITY INCLUDING ANY LIABILITY
                                                         -----------------------
FOR ANY OF THE AGENTS' OWN NEGLIGENCE (EXCEPT SUCH AS RESULT FROM SUCH AGENT'S
- -------------------------------------                                         
GROSS NEGLIGENCE, UNLAWFUL ACT OR WILLFUL MISCONDUCT) THAT SUCH AGENT MAY SUFFER
OR INCUR IN CONNECTION WITH THIS AGREEMENT OR ANY ACTION TAKEN OR OMITTED BY
SUCH AGENT HEREUNDER.  IT IS THE EXPRESS INTENTION OF THE PARTIES HERETO THAT
THE AGENTS, THEIR RESPECTIVE DIRECTORS, OFFICERS, AGENTS OR EMPLOYEES SHALL BE
INDEMNIFIED AND HELD HARMLESS BY THE BANKS FROM ALL COSTS, EXPENSES (INCLUDING
COUNSEL FEES AND DISBURSEMENTS) CLAIMS, DEMANDS, ACTIONS, LOSSES OR LIABILITIES
ARISING OUT OF OR RESULTING FROM THE ORDINARY NEGLIGENCE (WHETHER SOLE OR
CONTRIBUTORY) OF SUCH PERSONS.

     SECTION  7.07.   Credit Decision.  Each Bank acknowledges that it has,
                      ---------------                                      
independently and without reliance upon any Agent or any other Bank, and based
on such documents and information as it has deemed appropriate, made its own
credit analysis and decision to enter into this Agreement.  Each Bank also
acknowledges that

                                      66
<PAGE>
 
it will, independently and without reliance upon any Agent or any other Bank,
and based on such documents and information as it shall deem appropriate at the
time, continue to make its own credit decisions in taking or not taking any
action under this Agreement.

     SECTION  7.08.   Successor Agents.  Any of the Agents may resign at any
                      ----------------                                      
time by giving written notice thereof to the Banks and the Borrower, with such
resignation to be effective upon the acceptance by a successor Agent of its
appointment as agent hereunder, as set forth below.  Further, upon vote of the
Required Banks, any of the Agents may be replaced by any other Bank consented to
by the Borrower (which consent shall not be unreasonably withheld) and which
Bank consents to assume the duties of such Agent being replaced; provided,
                                                                 -------- 
however, that upon any such resignation or removal, a remaining Agent (at its
- -------                                                                      
sole discretion) may assume the role and responsibilities of the resigning
Agent, with the consent of the Borrower, which consent shall not be unreasonably
withheld.  If a remaining Agent chooses not to accept such appointment following
a resignation, the Required Banks shall have the right to appoint a successor
Agent, with the consent of the Borrower, which consent shall not be unreasonably
withheld. If no successor Agent shall have been so appointed by the Required
Banks, and shall have accepted such appointment, within 30 days after the
retiring Agent's giving of notice of resignation, then the retiring Agent may,
on behalf of the Banks, appoint a successor Agent, which shall be a Bank or a
commercial bank organized under the laws of the United States of America or of
any state thereof and having a combined capital and surplus of at least
$50,000,000. Upon the acceptance of its appointment as Agent hereunder by a
successor Agent, such successor Agent shall thereupon succeed to and become
vested with all the rights and duties of the retiring Agent, and the retiring
Agent shall be discharged from its duties and obligations hereunder. After any
retiring Agent's resignation hereunder as an Agent, the provisions of this
Article shall inure to its benefit as to any actions taken or omitted to be
taken by it while it was an Agent.

                                 ARTICLE VIII

                            CHANGE IN CIRCUMSTANCES

     SECTION  8.01.   Basis for Determining Interest Rate Inadequate or Unfair.
                      --------------------------------------------------------  
If on or prior to the first day of any Interest Period for any Euro-Dollar
Committed Borrowing:

          (1) the Administrative Agent is advised by the Reference Banks that
     deposits in dollars (in the applicable amounts) are not being offered to
     the Reference Banks in the relevant market for such Interest Period, or

                                      67
<PAGE>
 
          (2) the Required Banks advise the Administrative Agent that the Euro-
     Dollar Rate, as determined by the Administrative Agent, will not adequately
     and fairly reflect the cost to such Banks of funding their Euro-Dollar
     Committed Loans for such Interest Period,

the Administrative Agent shall forthwith give notice thereof to the Borrower and
the Banks; whereupon, until the Administrative Agent notifies the Borrower that
the circumstances giving rise to such notice no longer exist, (A) the
obligations of the Banks to make Euro-Dollar Committed Loans shall be suspended
and (B) unless the Borrower notifies the Administrative Agent at least one
Domestic Business Day before the date of any Euro-Dollar Committed Borrowing for
which a Notice of Committed Borrowing has previously been given that it elects
not to borrow on such date, such Euro-Dollar Committed Borrowing shall be made
as a Base Rate Borrowing.

     SECTION  8.02.   Illegality.  If, after the Effective Date, the adoption of
                      ----------                                                
any applicable law, rule or regulation, or any change therein, or any change in
the interpretation or administration thereof by any governmental authority,
central bank or comparable agency charged with the interpretation or
administration thereof, or compliance by any Bank (or its Euro-Dollar Lending
Office) with any request or directive (whether or not having the force of law)
of any such authority, central bank or comparable agency shall make it unlawful
or impossible for any Bank (or its Euro-Dollar Lending Office) to make, maintain
or fund its Euro-Dollar Committed Loans or its Euro-Dollar Competitive Loans and
such Bank shall so notify the Administrative Agent, the Administrative Agent
shall forthwith give notice thereof to the other Banks and the Borrower
whereupon until such Bank notifies the Borrower and the Administrative Agent
that the circumstances giving rise to such suspension no longer exist (which
such Bank shall do forthwith) the obligation of such Bank to make Euro-Dollar
Committed Loans or its Euro-Dollar Competitive Loans shall be suspended. Before
giving any notice to the Administrative Agent pursuant to this Section, such
Bank shall designate a different Euro-Dollar Lending Office if such designation
will avoid the need for giving such notice and will not, in the reasonable
judgment of such Bank, be otherwise disadvantageous to such Bank.  If such Bank
shall determine that it may not lawfully continue to maintain and fund any of
its outstanding Euro-Dollar Committed Loans or its Euro-Dollar Competitive Loans
to maturity and shall so specify in such notice, the Borrower shall immediately
prepay in full the then outstanding principal amount of each such affected Euro-
Dollar Committed Loan or Euro-Dollar Competitive Loan, together with accrued
interest thereon.  Concurrently with prepaying each such affected Euro-Dollar
Committed Loan or Euro-Dollar Competitive Loan, the Borrower shall borrow a Base
Rate Loan and such Bank shall make such Base Rate Loan.

     SECTION  8.03.   Increased Cost and Reduced Return.  (a)  If on or after
                      ---------------------------------                      
the Effective Date, in the case of any Loan or any obligation to make Loans or
any 

                                      68
<PAGE>
 
obligations to issue or participate in any Letters of Credit, the adoption
of any applicable law, rule or regulation, or any change therein, or any change
in the interpretation or administration thereof by any governmental authority,
central bank or comparable agency charged with the interpretation or
administration thereof, or compliance by any Bank (or its Parent or Applicable
Lending Office) with any request or directive (whether or not having the force
of law) of any such authority, central bank or comparable agency:

          (i)  shall subject any Bank (or its Applicable Lending Office) to any
     tax, duty or other charge with respect to its Euro-Dollar Committed Loans,
     its Competitive Loans or participation in Letters of Credit, its Committed
     Notes, its Competitive Notes or its obligation to make Euro-Dollar
     Committed Loans or issue Letters of Credit, or shall change the basis of
     taxation of payments to any Bank (or its Applicable Lending Office) of the
     principal of or interest on its Euro-Dollar Committed Loans, its
     Competitive Loans or Letters of Credit or any other amounts due under this
     Agreement in respect of its Euro-Dollar Committed Loans, its Competitive
     Loans or Letters of Credit or its obligation to make Euro-Dollar Committed
     Loans or issue or participate in Letters of Credit (except for changes in
     the rate of tax on the income of such Bank or its Applicable Lending Office
     or changes in franchise taxes imposed on it under applicable law); or

          (ii) shall impose, modify or deem applicable any reserve, special
     deposit, deposit insurance assessment or similar requirement (including,
     without limitation, any such requirement imposed by the Board of Governors
     of the Federal Reserve System, but excluding, with respect to any Euro-
     Dollar Committed Loan or Euro-Dollar Competitive Loan, any such requirement
     with respect to which such Bank is entitled to compensation during the
     relevant Interest Period under Section 8.05) against assets of, deposits
     with or for the account of, or credit extended by, any Bank (or its
     Applicable Lending Office) or shall impose on any Bank (or its Applicable
     Lending Office) or on the London interbank market any other condition
     affecting its Euro-Dollar Committed Loans, its Competitive Loans, its
     Committed Notes, its Competitive Notes or its obligation to make Euro-
     Dollar Committed Loans;

and the result of any of the foregoing is to increase the actual cost to such
Bank (or its Applicable Lending Office) of making or maintaining any Euro-Dollar
Committed Loan or Competitive Loan or issuing or participating in any Letter of
Credit, or to reduce the amount of any sum received or receivable by such Bank
(or its Applicable Lending Office) under this Agreement or under its Committed
Notes or Competitive Notes with respect thereto, by an amount reasonably deemed
by such Bank to be material, then, within 15 days after demand by such Bank
(with a copy to the Administrative Agent), the Borrower shall pay to such Bank
(without duplication of amounts otherwise payable hereunder) such additional
amount or amounts as will

                                      69
<PAGE>
 
compensate such Bank for such increased cost or reduction with respect to such
affected Euro-Dollar Committed Loan, Competitive Loan or Letter of Credit or
such affected sum.

     (b) If any Bank shall have reasonably determined that the adoption of any
applicable law, rule or regulation regarding capital adequacy or any change
therein, or any change in the interpretation or administration thereof by any
governmental authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Bank (or its
Parent or Applicable Lending Office) with any request or directive regarding
capital adequacy (whether or not having the force of law) of any such authority,
central bank or comparable agency, has or has had the effect of reducing the
rate of return on capital of such Bank (or its Parent) as a consequence of such
Bank's obligations hereunder to a level below that which such Bank or its Parent
could have achieved but for such adoption, change or compliance (taking into
consideration such Bank's policies with respect to capital adequacy) by an
amount deemed by such Bank to be material, then from time to time, within 15
days after demand by such Bank (with a copy to the Administrative Agent), the
Borrower shall pay to such Bank (without duplication of amounts otherwise
payable hereunder) such additional amount or amounts as will compensate such
Bank or its Parent for such reduction.

     (c) Each Bank will promptly notify the Borrower and the Administrative
Agent of any event of which it has knowledge, occurring after the Effective
Date, which will entitle such Bank to compensation pursuant to this Section and
will designate a different Applicable Lending Office if such designation will
avoid the need for, or reduce the amount of, such compensation and will not, in
the reasonable judgment of such Bank, be otherwise disadvantageous to such Bank.
A certificate of any Bank claiming compensation under this Section, setting
forth the additional amount or amounts to be paid to it hereunder and setting
forth in reasonable detail the basis for such compensation shall be conclusive
in the absence of manifest error, and the amount set forth therein shall be
payable by the Borrower within five days after receipt of such certificate. In
determining such amount, such Bank may use any reasonable averaging and
attribution methods.

     SECTION  8.04.   Substitute Loans.  If (i) the obligation of any Bank to
                      ----------------                                       
make Euro-Dollar Committed or Euro-Dollar Competitive Loans has been suspended
pursuant to Section 8.01 or 8.02 or (ii) any Bank has demanded compensation
under Section 8.03(a) and the Borrower shall, by at least five Euro-Dollar
Business Days' prior notice to such Bank through the Administrative Agent, have
elected that the provisions of this Section shall apply to such Bank, then,
unless and until such Bank notifies the Borrower that the circumstances giving
rise to such suspension or demand for compensation no longer apply (which such
Bank shall do forthwith):

                                      70
<PAGE>
 
          (a) all Loans which would otherwise be made by such Bank as Euro-
     Dollar Committed Loans or Euro-Dollar Competitive Loans, as the case may
     be, shall be made instead as Base Rate Loans, and

          (b) after each of its Euro-Dollar Committed Loans or Euro-Dollar
     Competitive Loans, as the case may be, has been repaid, all payments of
     principal which would otherwise be applied to repay such Euro-Dollar
     Committed Loans or Euro-Dollar Competitive Loans, as the case may be, shall
     instead be applied to repay its Loans made pursuant to Section 8.02 or
     clause (a) above.

     SECTION  8.05.   Regulation D Compensation.  Each Bank may require the
                      -------------------------                            
Borrower to pay, contemporaneously with each payment of interest on Euro-Dollar
Committed Borrowings or Euro-Dollar Competitive Borrowings, additional interest
on the related Euro-Dollar Committed Loan or Euro-Dollar Competitive Loan of
such Bank at a rate per annum equal to the excess of (i) (A) the applicable
Euro-Dollar Rate divided by (B) one minus the Euro-Dollar Reserve Percentage
over (ii) the rate specified in clause (i)(A).  Any Bank electing to require
payment of such additional interest (x) shall so notify the Borrower and the
Administrative Agent, in which case such additional interest on the Euro-Dollar
Committed Loans or Euro-Dollar Competitive Loans of such Bank shall be payable
to such Bank at the place indicated in such notice with respect to each Interest
Period commencing at least five Euro-Dollar Business Days after the giving of
such notice and (y) shall notify the Borrower at least five Euro-Dollar Business
Days prior to each date on which interest is payable on the Euro-Dollar
Committed Loans of the amount then due it under this Section.

     SECTION  8.06.   Substitution of Bank.  If (i) the obligation of any Bank
                      --------------------                                    
to make Euro-Dollar Committed Loans or Euro-Dollar Competitive Loans has been
suspended pursuant to Section 8.01 or 8.02 or (ii) any Bank has demanded
compensation under Section 8.03 or 8.05, or if any Bank has notified the
Borrower that it is not capable of receiving payments without deduction or
withholding pursuant to Section 2.19 the Borrower shall have the right, with the
assistance of the Administrative Agent, to seek a mutually satisfactory
substitute bank or banks (which may be one or more of the Banks) to purchase the
Committed Notes or Competitive Notes for cash without recourse to such Bank and
assume the Commitment and participation in any Letters of Credit of such Bank.
Any such purchase shall be at par, shall be subject to the provisions of Section
2.15, shall be without prejudice to the Borrower's obligations under Section
9.04 and shall release such Bank from all further obligations under this
Agreement.

                                      71
<PAGE>
 
                                  ARTICLE IX

                                 MISCELLANEOUS

     SECTION  9.01.   Notices.  All notices and other communications provided
                      -------                                                
for herein shall be in writing (including bank wire, telex, telegraph, telecopy,
cable or similar writing) and shall be given to the intended recipient at the
"Address for Notices" specified, if the intended recipient is the Borrower or
any of the Agents, below its name on the signature pages hereof or, if the
intended recipient is a Bank, in such Bank's Administrative Questionnaire, or,
as to any party, at such other address as shall be designated by such party in a
notice to the Borrower and the Administrative Agent. All notices and other
communications shall be effective (i) if given by telex, when such telex is
transmitted to the telex number specified in this Section and the appropriate
answerback is received, (ii) if given by mail, 72 hours after such communication
is deposited in the mails with first class postage prepaid, addressed as
aforesaid, (iii) if given by telecopier, upon telephone confirmation that the
telecopied document has been received by the individual to whom it was
addressed, or (iv) if given by any other means, when delivered at the address
specified in this Section; provided, however, that notices to the Administrative
                           --------  -------                                    
Agent under Article II or VIII hereof shall not be effective until received and
notices to the Borrower under Section 6.01 shall not be effective until such
notice is received.

     SECTION  9.02.   No Waiver.  No failure on the part of any of the Agents or
                      ---------                                                 
any Bank to exercise and no delay in exercising, and no course of dealing with
respect to, any right, power or privilege under this Agreement or any Note shall
operate as a waiver thereof, nor shall any single or partial exercise of any
right, power or privilege under this Agreement or any Note preclude any other or
further exercise thereof or the exercise of any other right, power or privilege.
To the extent permitted by applicable law, the remedies provided herein are
cumulative and not exclusive of any remedies provided by law.

     SECTION  9.03.   GOVERNING LAW.  THIS AGREEMENT AND THE NOTES SHALL BE
                      -------------                                        
GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF TEXAS.

     SECTION  9.04.   Expenses; Documentary Taxes; Indemnification.   (a)  The
                      --------------------------------------------            
Borrower shall pay, within 30 days after receipt of a reasonably detailed
statement setting forth the amount and nature thereof, (i) all out-of-pocket
expenses of the Agents, including the reasonable fees and disbursements of one
firm serving as special counsel for both Agents, in connection with the
preparation of this Agreement, any waiver or consent hereunder or any amendment
hereof or any Default or alleged Default hereunder and (ii) if an Event of
Default occurs, all out-of-pocket expenses incurred by the Agents or any Bank,
including reasonable fees and disbursements of

                                      72
<PAGE>
 
counsel (either outside counsel or in-house counsel, as the case may be), in
connection with such Event of Default and collection and other enforcement
proceedings resulting therefrom. The Borrower shall indemnify each Bank against
any transfer taxes, documentary taxes, assessments or charges made by any
governmental authority by reason of the execution and delivery of this Agreement
or the Notes.

     (B) THE BORROWER AGREES TO INDEMNIFY EACH BANK (AND ITS AFFILIATES
DIRECTORS, OFFICERS, AGENTS AND EMPLOYEES) AND EACH AGENT (AND ITS AFFILIATES
DIRECTORS, OFFICERS, AGENTS AND EMPLOYEES) AND HOLD EACH BANK AND EACH AGENT
HARMLESS FROM AND AGAINST ANY AND ALL LIABILITIES, LOSSES, DAMAGES, COSTS AND
EXPENSES OF ANY KIND (INCLUDING THE REASONABLE FEES AND DISBURSEMENTS OF COUNSEL
(EITHER OUTSIDE COUNSEL OR IN-HOUSE COUNSEL, AS THE CASE MAY BE) FOR ANY BANK
AND ANY AGENT IN CONNECTION WITH ANY INVESTIGATIVE, ADMINISTRATIVE OR JUDICIAL
PROCEEDING, WHETHER OR NOT SUCH BANK OR SUCH AGENT SHALL BE DESIGNATED A PARTY
THERETO) WHICH MAY BE INCURRED BY SUCH BANK, OR BY SUCH AGENT IN CONNECTION WITH
ITS ACTIONS AS AN AGENT HEREUNDER, RELATING TO OR ARISING OUT OF ARTICLE VI OR
VII OF THIS AGREEMENT OR ANY ACTUAL OR PROPOSED USE OF PROCEEDS OF LOANS
HEREUNDER.

     (C) EACH AGENT AND EACH BANK ENTITLED TO INDEMNITY FROM THE BORROWER UNDER
ANY PROVISION OF THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT SHALL BE INDEMNIFIED
AND HELD HARMLESS TO THE EXTENT PROVIDED THEREUNDER AGAINST ANY AND ALL LOSSES,
LIABILITIES, DAMAGES, CLAIMS, DEFICIENCIES, JUDGMENTS, COSTS OR REASONABLE
EXPENSES RELATING TO ENVIRONMENTAL LAWS OR RELEASES IF ANY OF SUCH LOSSES,
LIABILITIES, DAMAGES, CLAIMS, DEFICIENCIES, JUDGMENTS, COSTS OR EXPENSES RELATE
TO VIOLATIONS OF REQUIREMENTS OF ENVIRONMENTAL LAWS RESULTING FROM ANY OF THE
BORROWER'S AND ITS CONSOLIDATED SUBSIDIARIES' OPERATIONS (OTHER THAN AS A RESULT
OF SUCH INDEMNIFIED PERSON'S ACTS OR OMISSIONS IF SUCH INDEMNIFIED PERSON IS
DEEMED TO BE A "PERSON IN CONTROL" UNDER ANY STATE OR FEDERAL STATUTE OR
REGULATION).

     (D) WITHOUT LIMITING ANY PROVISION OF THIS AGREEMENT OR ANY OF THE OTHER
LOAN DOCUMENTS BUT IN ALL EVENTS SUBJECT TO PARAGRAPH (E) OF THIS SECTION 9.04,
IT IS THE EXPRESS INTENTION OF THE BORROWER AND THE OTHER PARTIES HERETO THAT
EACH INDEMNIFIED PERSON ENTITLED TO INDEMNITY UNDER ANY PROVISION OF THIS
AGREEMENT OR ANY OTHER LOAN DOCUMENT SHALL BE INDEMNIFIED AND HELD HARMLESS TO
THE EXTENT PROVIDED THEREUNDER AGAINST ANY AND ALL LOSSES, LIABILITIES, CLAIMS,
DEFICIENCIES, JUDGMENTS OR REASONABLE EXPENSES ARISING OUT OF OR RESULTING FROM
THE ORDINARY NEGLIGENCE (WHETHER SOLE OR CONTRIBUTORY) OF SUCH INDEMNIFIED
PERSON.

     (E) NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT OR ANY OTHER LOAN
DOCUMENT OR ANY OTHER DOCUMENT OR INSTRUMENT, IN NO EVENT SHALL THE BORROWER BE
LIABLE TO ANY INDEMNIFIED PERSON IN 

                                      73
<PAGE>
 
ANY MANNER WITH RESPECT TO ANY LIABILITIES DAMAGES, LOSSES, CLAIMS,
DEFICIENCIES, JUDGMENTS, COSTS OR EXPENSES OF ANY KIND FOR ANY ACTS OR OMISSIONS
CONSTITUTING GROSS NEGLIGENCE, AN UNLAWFUL ACT OR WILLFUL MISCONDUCT OR
VIOLATION OF LAW ON THE PART OF SUCH INDEMNIFIED PERSON.

     SECTION  9.05.   Amendments, Etc.  Any provision of this Agreement or the
                      ----------------                                        
Notes may be amended or waived if, but only if, such amendment or waiver is in
writing and is signed by the Borrower and the Required Banks (and, if the rights
or duties of any Agent are affected thereby, by such Agent); provided, however,
                                                             --------  ------- 
that no such amendment, waiver or modification shall, unless signed by all the
Banks, (i) increase or decrease the Commitment of any Bank (except for increases
to the Commitment of any Bank pursuant to Section 8.06 to which such Bank has
agreed in writing), (ii) reduce the principal of or rate of interest on any Loan
or any fees hereunder, (iii) postpone the date fixed for any payment of
principal of or interest on any Loan or any fees hereunder or for any
termination of any Commitment, (iv) change the percentage of the Commitments or
of the aggregate unpaid principal amount of the Notes, or the number of Banks,
which shall be required for the Banks or any of them to take any action under
this Section or any other provision of this Agreement or (v) amend or waive any
provision of Section 3.01 or this Section 9.05.  Notwithstanding the foregoing,
the Administrative Agent and the Borrower shall have the right, without consent
of the Required Banks, to amend the procedures for the extension of the
Termination Date set forth in Section 2.01 to the extent the Administrative
Agent shall determine such amendment to be necessary to ensure that the Banks
will not be required to maintain capital against their Commitments under
applicable rules, regulations and interpretations of bank regulatory
authorities; provided, that no such amendment shall permit the extension of any
             --------                                                          
Bank's Commitment without the consent of such Bank.

     SECTION  9.06.   Counterparts; Integration.  This Agreement may be executed
                      -------------------------                                 
in any number of counterparts, all of which taken together shall constitute one
and the same instrument, and any of the parties hereto may execute this
Agreement by signing any such counterpart.  This Agreement constitutes the
entire agreement and understanding among the parties hereto and supersedes any
and all prior agreements and understandings, oral or written, relating to the
subject matter hereof.

     SECTION  9.07.   Successors and Assigns.  (a)  The provisions of this
                      ----------------------                              
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns, except that the Borrower may not
assign or otherwise transfer any of its rights under this Agreement without the
prior written consent of all Banks.

                                      74
<PAGE>
 
     (b)  Any Bank may at any time grant to one or more banks or other
institutions (each a "Participant") participating interests in its Commitment or
any or all of its Loans or any or all of its Commitment Percentage of Letter of
Credit Outstandings. In the event of any such grant by a Bank of a participating
interest to a Participant, whether or not upon notice to the Borrower and the
Agents, such Bank shall remain responsible for the performance of its
obligations hereunder, and the Borrower and the Agents shall continue to deal
solely and directly with such Bank in connection with such Bank's rights and
obligations under this Agreement. Any agreement pursuant to which any Bank may
grant such a participating interest shall provide that such Bank shall retain
the sole right and responsibility to enforce the obligations of the Borrower
hereunder including, without limitation, the right to approve any amendment,
modification or waiver of any provision of this Agreement; provided, however,
                                                           --------  ------- 
that such participation agreement may provide that such Bank will not agree to
any modification, amendment or waiver of this Agreement described in clause (i),
(ii), (iii) or (iv) of Section 9.05 without the consent of the Participant. The
Borrower agrees that each Participant shall be entitled to the benefits of
Sections 2.14 and 9.04 and Article VIII with respect to its participating
interest; provided, however, that all amounts payable to a Bank for the account
          --------  -------                                                    
of a Participant under Sections 2.14 and 9.04 and Article VIII shall be
determined as if such Bank had not granted such participation to the
Participant. An assignment or other transfer which is not permitted by
subsection (c) below shall be given effect for purposes of this Agreement only
to the extent of a participating interest granted in accordance with this
subsection (b).

     (c)  Any Bank may, upon 5 days notice to the Administrative Agent and the
Borrower, assign to one or more banks or other institutions (each an "Assignee")
all, or a proportionate part of all (in minimum amounts of $10,000,000 and in
multiples of $1,000,000), of its rights and obligations under this Agreement and
the Notes, and such Assignee shall assume such rights and obligations, pursuant
to an instrument executed by such Assignee and such transferor Bank, with (and
subject to) the written consent of the Borrower and the Administrative Agent;
which shall not be unreasonably withheld; provided, however, that if an Assignee
                                          --------  -------                     
is the local Federal Reserve Bank branch for the region in which such Bank is
located and is receiving a collateral assignment or is an Affiliate of such
transferor Bank, no such consent shall be required.  Upon execution by the
transferor Bank, the Borrower, the Assignee and the Agents, and delivery of,
such an instrument and payment by such Assignee to such transferor Bank of an
amount equal to the purchase price agreed between such transferor Bank and such
Assignee, such Assignee shall be a Bank party to this Agreement and shall have
all the rights and obligations of a Bank with a Commitment as set forth in such
instrument of assumption, and the transferor Bank shall be released from its
obligations hereunder to the extent of such assignment, and no further consent
or action by any party shall be required.  Upon the consummation of any
assignment pursuant to this subsection (c), the transferor Bank, the Agents and

                                      75
<PAGE>
 
the Borrower shall make appropriate arrangements so that, if required, new Notes
are issued to the Assignee. Prior to the issuance of any such new Note, the
Assignee to which such Note is issued shall pay to the Administrative Agent a
fee of $2,000.00.

     (d)  No Assignee or other transferee of any Bank's rights shall be entitled
to receive any greater payment under Section 8.03 than such Bank would have been
entitled to receive with respect to the rights transferred, unless such transfer
is made with the Borrower's prior written consent or by reason of the provisions
of Section 8.02 or 8.03 requiring such Bank to designate a different Lending
Office under certain circumstances or at a time when the circumstances giving
rise to such greater payment did not exist.

     (e)  If the Reference Bank assigns its Notes to an institution that is not
an Affiliate, the Administrative Agent shall, in consultation with the Borrower
and with the consent of the Required Banks, appoint another bank to act as the
Reference Bank hereunder.

     SECTION  9.08. Survival.  The obligations of the Borrower under Article
                    --------                                                
VIII and Section 9.04 shall survive the repayment of the Loans and the
satisfaction of the Letter of Credit Outstandings and the termination of the
Commitments.

     SECTION  9.09. Acknowledgment.  The Borrower acknowledges that the Banks
                    --------------                                           
have entered into this Agreement in reliance on the Borrower's assurance that
the Borrower does not intend to use the proceeds of any Borrowings hereunder in
a manner which would violate any applicable law or governmental rule or
regulation.

     SECTION  9.10. Headings.  The Table of Contents and Article and Section
                    --------                                                
headings used herein shall not affect the interpretation of any provision of
this Agreement.

     SECTION  9.11. Sharing of Setoffs.  Each Bank agrees that, if it shall,
                    ------------------                                      
by exercising any right of setoff or counterclaim or otherwise, receive payment
of a proportion of the aggregate amount of principal and interest due with
respect to any Committed Note or Competitive Note held by it or any Letter of
Credit Outstandings which is greater than the proportion received by any other
Bank in respect of the aggregate amount of principal and interest due with
respect to any Committed Note or Competitive Note held by such other Bank or any
Letter of Credit Outstandings (other than disproportionate payments to any Bank
provided for by this Agreement), the Bank receiving such proportionately greater
payment shall purchase such participation in the Committed Notes or the
Competitive Notes held by, or the rights in respect of Letter of Credit
Outstandings of, the other Banks, and such other adjustments shall be made, as
may be required so that all such payments of principal and interest with respect
to the Committed Notes or the Competitive Notes and Letter

                                      76
<PAGE>
 
of Credit Outstandings held by the Banks shall be shared by the Banks pro rata;
provided, however, that nothing in this Section shall impair the right of
- --------  ------- 
any Bank to exercise any right of setoff or counterclaim it may have and to
apply the amount recovered thereby to the payment of indebtedness of the
Borrower other than its indebtedness under the Notes, or in respect of Letter of
Credit Outstandings. If under any applicable bankruptcy, insolvency or other
similar law, any Bank receives a secured claim in lieu of a setoff to which this
Section applies, such Bank shall, to the extent practicable, exercise its rights
in respect of such secured claim in a manner consistent with the rights of the
Banks entitled under this Section to share in the benefits of any recovery on
such secured claim.

     SECTION  9.12. Collateral.  Each of the Banks represents to the Agents
                    ----------                                             
and each of the other Banks that it in good faith is not relying upon any
"margin stock" (as defined in Regulation U) as collateral in the extension or
maintenance of the credit provided for in this Agreement.

     SECTION  9.13. CONSENT TO JURISDICTION.  (a)  TO THE EXTENT PERMITTED BY
                    -----------------------                                  
APPLICABLE LAW, THE BORROWER IRREVOCABLY SUBMITS TO THE NONEXCLUSIVE
JURISDICTION OF ANY FEDERAL OR STATE COURT SITTING IN HARRIS COUNTY, TEXAS OVER
ANY SUIT, ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR
ANY NOTE OR ANY LETTER OF CREDIT. THE BORROWER IRREVOCABLY WAIVES ANY OBJECTION
WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF THE VENUE OF ANY SUCH SUIT,
ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT AND ANY CLAIM THAT ANY SUIT,
ACTION OR PROCEEDING BROUGHT IN ANY SUCH A COURT HAS BEEN BROUGHT IN AN
INCONVENIENT FORUM. THE BORROWER AGREES THAT A FINAL, NONAPPEALABLE JUDGMENT IN
ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH A COURT SHALL BE
CONCLUSIVE AND BINDING UPON THE BORROWER AND MAY BE ENFORCED IN ANY FEDERAL OF
STATE COURT SITTING IN THE STATE OF TEXAS (OR ANY OTHER COURTS TO THE
JURISDICTION OF WHICH THE BORROWER IS OR MAY BE SUBJECT) BY A SUIT UPON SUCH
JUDGMENT; PROVIDED, HOWEVER, THAT SERVICE OF PROCESS IS EFFECTED UPON THE
          --------  -------                                              
BORROWER IN ONE OF THE MANNERS SPECIFIED IN SUBSECTION (b) OF THIS SECTION OR AS
OTHERWISE PERMITTED BY LAW.

     (b)  SERVICE OF PROCESS.  TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE
          ------------------                                                 
BORROWER HEREBY CONSENTS TO PROCESS BEING SERVED IN ANY SUIT, ACTION OR
PROCEEDING REFERRED TO IN THE FIRST SENTENCE OF SUBSECTION (a) OF THIS SECTION
IN ANY FEDERAL OR STATE COURT SITTING IN HARRIS COUNTY, TEXAS BY MAILING A COPY
THEREOF BY REGISTERED OR CERTIFIED AIR MAIL, POSTAGE PREPAID, RETURN RECEIPT
REQUESTED, TO THE BORROWER AT ITS ADDRESS FOR NOTICES DETERMINED PURSUANT TO
SECTION 9.01.  THE BORROWER IRREVOCABLY WAIVES ALL CLAIM OF ERROR BY REASON 

                                      77
<PAGE>
 
OF ANY SUCH SERVICE IN ANY SUIT, ACTION OR PROCEEDING BROUGHT BY ANY AGENT OR
ANY BANK. THE BORROWER AGREES THAT SUCH SERVICE SHALL BE DEEMED IN EVERY RESPECT
EFFECTIVE SERVICE OF PROCESS UPON THE BORROWER IN ANY SUCH SUIT, ACTION OR
PROCEEDING AND SHALL BE TAKEN AND HELD TO BE VALID AND PERSONAL SERVICE UPON AND
PERSONAL DELIVERY TO THE BORROWER.

     (c)  NO LIMITATION ON SERVICE OR SUIT.  NOTHING IN THIS ARTICLE IS INTENDED
          --------------------------------                                      
TO AFFECT THE RIGHT OF ANY AGENT OR ANY BANK TO SERVE PROCESS IN ANY OTHER
MANNER PERMITTED BY LAW OR LIMIT THE RIGHT OF ANY AGENT OR ANY BANK TO BRING
PROCEEDINGS OTHERWISE PERMITTED BY LAW AGAINST THE BORROWER IN THE COURTS OF THE
JURISDICTION OF ANY BANK'S LENDING OFFICE OR THE COURTS OF ANY JURISDICTION OR
JURISDICTIONS IN WHICH THE BORROWER HAS ANY ASSETS.

     SECTION  9.14. FINAL AGREEMENT OF THE PARTIES.  THIS AGREEMENT (INCLUDING
                    ------------------------------                            
THE SCHEDULES AND EXHIBITS HERETO), THE NOTES AND THE OTHER LOAN DOCUMENTS
CONSTITUTE A "LOAN AGREEMENT" AS DEFINED IN SECTION 26.02(A) OF THE TEXAS
BUSINESS AND COMMERCE CODE, AND REPRESENT THE FINAL AGREEMENT BETWEEN THE
PARTIES RELATING TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS
OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                                      78
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                              LYONDELL PETROCHEMICAL COMPANY

                              By:________________________________________
                              Name:  Jeffrey R. Pendergraft
                              Title: Senior Vice President and
                                     Chief Administrative Officer

                              Address for Notices:

                              One Houston Center
                              Suite 1600
                              1221 McKinney Street
                              P.O. Box 3646
                              Houston, TX 77253-3646
                              Attn: Treasurer
                              Telephone No.:  (713) 652-7200
                              Telecopier No.: (713) 652-7430


                              TEXAS COMMERCE BANK NATIONAL
                              ASSOCIATION, as Administrative Agent

                              By:________________________________________
                              Name:  D. G. Mills
                              Title: Vice President

                              Address for Notices:

                              712 Main Street
                              Houston, TX 77002
                              Attn:  Syndications Department
                              Telephone No.:  (713) 216-4037
                              Telecopier No.: (713) 216-2339
<PAGE>
 
                              BANK OF AMERICA NATIONAL TRUST AND 
                              SAVINGS ASSOCIATION, as Documentation Agent

                              By:________________________________________
                              Name:  Michael J. Dillon
                              Title: Managing Director
 
                              Address for Notices:

                              231 South LaSalle Street, 10th Floor
                              Chicago, IL 60697
                              Attn: Gloria Turner
                              Telephone No.:  (312) 828-4575
                              Telecopier No.: (312) 974-9626


                              THE CHASE MANHATTAN BANK, as Auction Agent


                              By:________________________________________
                              Name:  Sandra J. Miklave
                              Title: Vice President

                              Address for Notices:

                              1 Chase Manhattan Plaza, 8th Floor
                              New York, NY 10081
                              Attn: Christopher Consomer
                              Telephone No.:  (212) 552-7259
                              Telecopier No.: (212) 522-5627
<PAGE>
 
A BANK:                       BANK OF AMERICA NATIONAL TRUST AND 
- ------                                                                         
                              SAVINGS ASSOCIATION


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       TEXAS COMMERCE BANK NATIONAL ASSOCIATION
- ------                                                           


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       THE BANK OF NEW YORK
- ------                                       


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       THE BANK OF NOVA SCOTIA
- ------                                          


                              By:________________________________________
                              Name:  F. C. H. Ashby
                              Title: Senior Manager Loan Operations
<PAGE>
 
A BANK:                       THE BANK OF TOKYO-MITSUBISHI, LTD.,
- ------                                                      
                              HOUSTON AGENCY


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       CREDIT LYONNAIS NEW YORK BRANCH
- ------                                                  


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       THE FUJI BANK, LTD.
- ------                                      


                              By:________________________________________
                              Name:  Jacques Azagury
                              Title: Vice President and Manager
<PAGE>
 
A BANK:                       NATIONSBANK OF TEXAS, N.A.
- ------                                             


                              By:________________________________________
                              Name:  Patrick M. Delaney
                              Title: Senior Vice President
<PAGE>
 
A BANK:                       SOCIETE GENERALE, SOUTHWEST AGENCY
- ------                                                     


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       UNION BANK OF SWITZERLAND
- ------                                            


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________



                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       THE FIRST NATIONAL BANK OF CHICAGO
- ------                                                     


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       BANK OF SCOTLAND
- ------                                   


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       THE LONG-TERM CREDIT BANK OF JAPAN, LTD.
- ------                                                           


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
A BANK:                       PNC BANK, NATIONAL ASSOCIATION
- ------                                                 


                              By:________________________________________
                              Name:______________________________________
                              Title:_____________________________________
<PAGE>
 
                                                                      SCHEDULE I

                                  COMMITMENTS
<TABLE>
<CAPTION> 
Bank                                                        Commitment
- ----                                                        ----------
<S>                                                         <C>
Bank of American National Trust and Savings Association     $ 20,000,000
Texas Commerce Bank National Association                    $ 20,000,000
The Bank of New York                                        $ 17,500,000
The Bank of Nova Scotia                                     $ 17,500,000
The Bank of Tokyo-Mitsubishi, Ltd.                          $ 17,500,000
Credit Lyonnais New York Branch                             $ 17,500,000
The Fuji Bank, Ltd.                                         $ 17,500,000
NationsBank of Texas, N.A.                                  $ 17,500,000
Societe Generale, Southwest Agency                          $ 17,500,000
Union Bank of Switzerland                                   $ 17,500,000
The First National Bank of Chicago                          $ 15,000,000
Bank of Scotland                                            $ 10,000,000
The Long-Term Credit Bank of Japan, Lt.d                    $ 10,000,000
PNC Bank, National Association                              $ 10,000,000
                                                            ------------
               Total Commitments                            $225,000,000
                                                            ============
</TABLE>
<PAGE>
 
                               SCHEDULE 5.03(C)

                                     None

<PAGE>
 
                                                                    EXHIBIT 10.3

                                   INSTRUMENT

                             AMENDING AND RESTATING

                         LYONDELL PETROCHEMICAL COMPANY

                    SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN


Lyondell Petrochemical Company hereby amends and restates the Supplementary
Executive Retirement Plan, effective as of November 1, 1996, to read in its
entirety as the document entitled "Lyondell Petrochemical Company Supplementary
Executive Retirement Plan" that is attached hereto.

IN WITNESS WHEREOF, the undersigned, being duly authorized on behalf of the
Company, has executed this Instrument on this ___ day of June, 1997.

 
ATTEST:                       LYONDELL PETROCHEMICAL COMPANY



BY:_______________________    BY:___________________________________
  Assistant Secretary                    Richard W. Park
                                    Vice President, Human Resources
<PAGE>
 
LYONDELL PETROCHEMICAL COMPANY

- --------------------------------------------------------------------------------

SUPPLEMENTARY EXECUTIVE
RETIREMENT PLAN


EFFECTIVE NOVEMBER 1, 1996
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                    SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN

                               TABLE OF CONTENTS

<TABLE> 
<CAPTION> 
                                                                                             PAGE
<S>                                                                                          <C> 
ARTICLE I - GENERAL PROVISIONS..............................................................   1
     Section 1.1    Purpose and Intent of Plan..............................................   1
     Section 1.2    Effective Date of Plan..................................................   2
     Section 1.3    Costs of Plan...........................................................   2
     Section 1.4    Definitions.............................................................   2

ARTICLE II - SUPPLEMENTARY BENEFITS.........................................................   6
     Section 2.1    Types of Supplementary Benefits Provided................................   6
     Section 2.2    Eligibility in General..................................................   6
                    (a)  Eligibility for Participant's Benefit..............................   6
                    (b)  Eligibility for Survivor's Benefit.................................   6
     Section 2.3    Amount of Supplementary Benefits (or Survivor
                    Benefit) in General.....................................................   7
     Section 2.4    Deferral/Incentive Supplement...........................................   8
                    (a)  Eligibility for Deferral/Incentive Supplement......................   8
                    (b)  Amount of Deferral/Incentive Supplement............................   8
                         (1)  Participant's Benefit.........................................   8
                         (2)  Survivor Benefit..............................................   8
                         (3)  Special Rule for Certain
                              Participants..................................................   9
                         (4)  No Proration for Certain
                              Portion of Deferral/Incentive Supplement......................   9
                    (c)  Maximum Limitation on Deferral/Incentive
                         Supplement Benefits................................................   9
                    (d)  Computation Procedure..............................................   9
                    (e)  Termination of Employment..........................................  10
     Section 2.5    Qualification Limitation Supplement.....................................  10
                    (a)  Eligibility for Qualification
                         Limitation Supplement..............................................  10
                    (b)  Amount of Qualification Limitation Supplement......................  10
                         (1)  Participant's Benefit.........................................  10
                         (2)  Survivor Benefit..............................................  11
</TABLE>

                                      (i)
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                    SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN


                          TABLE OF CONTENTS (CONT'D)

<TABLE>
<CAPTION>
<S>                                                                                  <C>
     Section 2.6         Special Supplements........................................ 11
                    (a)  Change in Control Supplement............................... 11
                         (1)  Eligibility for Change in Control
                              Supplement............................................ 11
                         (2)  Amount of Change in Control Supplement................ 11
                         (3)  Form and Timing of Change in Control Supplement....... 13
                    (b)  Other Special Supplements.................................. 13

ARTICLE III - FORM OF BENEFIT....................................................... 15
     Section 3.1    Supplementary Benefits.......................................... 15

                    (a)  Optional Forms of Benefit.................................. 15
                    (b)  Elections.................................................. 15
     Section 3.2    Special Supplements............................................. 16

ARTICLE IV - TIMING OF PAYMENT OF BENEFIT........................................... 17

     Section 4.1    Supplementary Benefits.......................................... 17
     Section 4.2    Special Supplements............................................. 17

ARTICLE V - BENEFITS ON CHANGE IN CONTROL........................................... 18
     Section 5.1    Events Constituting a "Change in Control"....................... 18
     Section 5.2    Amount of Benefit on Change in Control.......................... 20
     Section 5.3    Form of Benefit on Change in Control............................ 20
     Section 5.4    Payment on Change in Control.................................... 20

ARTICLE VI - ADMINISTRATION......................................................... 21
     Section 6.1    Administrative Committee........................................ 21
     Section 6.2    Rules of Conduct; Administrative Provisions..................... 21
     Section 6.3    Legal, Accounting, Clerical and Other Services.................. 21
     Section 6.4    Interpretation of Provisions.................................... 21
     Section 6.5    Records of Administration....................................... 21
     Section 6.6    Denial of Claim................................................. 21
     Section 6.7    Liability of Committee.......................................... 22

ARTICLE VII - FACILITY OF PAYMENT AND LAPSE OF BENEFITS............................. 23
     Section 7.1    Provisions for Incapacity....................................... 23
     Section 7.2    Payments of Deposits............................................ 23
 </TABLE>

                                      ii
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                    SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN


                          TABLE OF CONTENTS (CONT'D)

<TABLE>
<CAPTION>
<S>                                                                         <C>
ARTICLE VIII - MISCELLANEOUS............................................... 24
     Section 8.1    Unfunded Benefit Plan.................................. 24
     Section 8.2    Unsecured General Creditor............................. 24
     Section 8.3    Grantor Trust.......................................... 24
     Section 8.4    Payments and Benefits Not Assignable................... 24
     Section 8.5    No Right of Employment................................. 25
     Section 8.6    Adjustments............................................ 25
     Section 8.7    Obligation to Company.................................. 25
     Section 8.8    Protective Provisions.................................. 25
     Section 8.9    Gender, Singular and Plural............................ 25
     Section 8.10   Law Governing.......................................... 26
     Section 8.11   Validity............................................... 26
     Section 8.12   Notice................................................. 26
     Section 8.13   Successors and Assigns................................. 26

ARTICLE IX - AMENDMENT AND DISCONTINUANCE.................................. 27
     Section 9.1    Amendment of Plan...................................... 27
     Section 9.2    Termination............................................ 27
     Section 9.3    Effect of Amendment or Termination..................... 27
 </TABLE>

                                     (iii)
<PAGE>
 
                                   ARTICLE I

                              GENERAL PROVISIONS


SECTION 1.1  PURPOSE AND INTENT OF PLAN.

     The Prior Plan was originally adopted in 1990 in conjunction with the
adoption of the Atlantic Richfield Company Supplementary Executive Retirement
Plan and the ARCO Chemical Company Supplementary Executive Retirement Plan, the
provisions of which are substantially identical to the Prior Plan. Recognizing
that an Employee may transfer among Lyondell Petrochemical Company, ARCO and
ARCO Chemical Company during his service, each of the 3 companies has agreed to
pay a prorata share of the Employee's benefit under Articles II and III (which
were identical provisions under each of those 3 plans) of each of those 3 plans,
and which articles related to Deferral/Incentive Supplements and Qualification
Limitations, respectively.

     Subsequent to the adoption of the Prior Plan, Amendment No. 1 and Amendment
No. 2 were adopted. It has now been determined to be desirable to adopt certain
additional amendments that may become operative in the event of a potential
change in control of Lyondell Petrochemical Company and, for ease of
administration, to incorporate such amendments and the prior amendments into
this amended and restated Plan document. Nothing in such restatement of the Plan
is intended to reduce or adversely affect, solely as a result of such
restatement, the rights or benefits to which any Participant or Beneficiary
hereunder was entitled. Accordingly, this Plan is adopted as a complete
amendment, restatement, and continuation of the Prior Plan under the provisions
hereinafter set forth, without a gap or lapse in coverage, time, or effect.

     This Plan is intended to provide supplemental retirement allowances in
accordance with the provisions of the Plan contained herein, to those Employees
who:

     (a)  have received Awards under the Lyondell Petrochemical Company Value
Share Plan, the Lyondell Petrochemical Company Management Value Share Plan, the
Lyondell Petrochemical Company Annual Incentive Plan, the Atlantic Richfield
Company Annual Incentive Plan, the ARCO Chemical Company Annual Incentive Plan,
and/or the LYONDELL-CITGO Refining Company Ltd. Annual Incentive Plan or its
equivalent,

     (b)  have deferred a portion of their Salary under the Lyondell
Petrochemical Company Executive Deferral Plan, the Atlantic Richfield Company
Executive Deferral Plan, the ARCO Chemical Company Key Management Deferral Plan,
and/or the LYONDELL-CITGO Refining Company Ltd. Executive Deferral Plan,

     (c)  have had the amount of their benefit reduced, due to federal legal
requirements, under a tax-qualified, defined benefit retirement plan maintained
by Lyondell Petrochemical Company, ARCO, ARCO Chemical Company, and/or LCR, or

                                       1
<PAGE>
 
     (d)  have been granted a Special Supplement in accordance with the
provisions of Section 2.6 of this Plan.

SECTION 1.2  EFFECTIVE DATE OF PLAN.

        This amended and restated Plan document shall be generally effective as
of November 1, 1996 and shall apply to those Employees who are employed by the
Company on or after November 1, 1996, except to the extent that certain
provisions hereof specify that they are effective as of a different date.

        This Plan is an amendment and restatement of the Lyondell Petrochemical
Company Executive Supplementary Retirement Plan, effective as of April 1, 1989;
the Lyondell Petrochemical Company Retirement Benefit Restoration Plan,
effective as of April 1, 1989; and the Prior Plan.

SECTION 1.3  COSTS OF PLAN.

        All costs of this Plan, including the administration thereof, shall be
borne by the Company and no Employee contributions shall be required or
permitted.

SECTION 1.4  DEFINITIONS.

        Actuarial Equivalent or Actuarially Equivalent mean, in comparing
        ----------------------------------------------                       
payable in different forms or at different times or in different circumstances,
a value under one such set of circumstances which is the same as the value under
a different set of circumstances. Such value shall be computed and determined
with reference to mortality assumptions, interest rates and other actuarial
factors and assumptions then in effect under the Retirement Plan for the purpose
of calculating the actuarial equivalent under that Plan.

        Administrative Committee means the committee serving as the
        ------------------------                            
Administrative Committee of the Retirement Plan.

        ARCO means the Atlantic Richfield Company.
        ----                                      

        Award means a cash award made under the Lyondell Petrochemical Company
        -----                                                                
Value Share Plan, the Lyondell Petrochemical Company Management Value Share
Plan, the Lyondell Petrochemical Company Annual Incentive Plan, the Atlantic
Richfield Company Annual Incentive Plan, the ARCO Chemical Company Annual
Incentive Plan, and/or the LYONDELL-CITGO Refining Company, Ltd. Annual
Incentive Plan or its equivalent. Award does not include Deferred Cash as such
term is used in the Lyondell Petrochemical Company Value Share Plan or
Management Value Share Plan.

        Base Pay means "Annual Base Pay" as defined in the Retirement Plan.
        --------                                                           

                                       2
<PAGE>
 
        Basic Allowance means an annuity payable for the life of the
        ---------------
Participant, with a guarantee that an amount equal to 60 monthly payments will
be paid to the Participant and his Beneficiary.

        Beneficiary means a person who is entitled to receive the Survivor
        -----------                             
Benefit under Sections 2.4, 2.5 and/or 2.6(a) (and, if applicable, Section
2.6(b)) of this Plan in the event of the Participant's death.

        Change in Control Supplement means a supplementary benefit as described
        ----------------------------                  
in Section 2.6(a) of this Plan.

        Code means the Internal Revenue Code of 1986, as amended, including any
        ----                                                                   
successor provisions thereof and any regulations or other guidance promulgated
pursuant thereto by applicable governmental agencies.

        Company means Lyondell Petrochemical Company, a Delaware corporation, or
        ------- 
 its successor.

        Deferral/Incentive Supplement means a Supplementary Benefit as described
        ----------------------------- 
under Section 2.4 of this Plan.

        Deferred Compensation means any amount of Salary which a Participant
        ---------------------    
elects to defer pursuant to the provisions of the Lyondell Petrochemical Company
Executive Deferral Plan, Atlantic Richfield Company Executive Deferral Plan, the
ARCO Chemical Company Key Management Deferral Plan, and/or the LYONDELL-CITGO
Refining Company, Ltd. Executive Deferral Plan.

        Eligible Termination Date means, for purposes of Section 2.6(a), the
        -------------------------                                  
date on which an Employee terminates employment with the Company for one or more
of the reasons that entitle him to benefits under Section 3 of an Executive
Severance Agreement entered into between such Employee and the Company.

        Employee means any person who is regularly employed by the Company on or
        --------                                                
after October 1, 1990 and who is an exempt, salaried employee.

        ERISA means the Employee Retirement Income Security Act of 1974, as
        ----- 
amended, including any successor provisions thereof, and any regulations or
other guidance promulgated pursuant thereto by applicable governmental agencies.

        Fifty Percent Joint and Survivor Annuity means an annuity providing
        ----------------------------------------                   
payments for the life of a Participant, with a survivor annuity for the life of
his Beneficiary under which each payment to the Beneficiary is 50 percent of the
reduced amount payable during the life of the Participant. Each reduced payment
during the life of the Participant shall be a percentage of the amount otherwise

                                       3
<PAGE>
 
payable to the Participant in the form of a Basic Allowance, so that the Fifty
Percent Joint and Survivor Annuity is the Actuarial Equivalent of the Basic
Allowance otherwise payable to the Participant.

        Financial Hardship means a condition of financial difficulty, determined
        ------------------                                                    
by the Administrative Committee, upon advice of counsel, to be sufficient to
justify a change of election of the form of benefit under Section 3.1 without
causing, in the judgment of counsel, the receipt of taxable income by any other
Participant in the Plan in advance of the payment to him of Plan benefits.

        LCR means LYONDELL-CITGO Refining Company, Ltd.
        ---                                            

        Lump Sum means a single payment of the benefit that is the Actuarial
        --------                                           
Equivalent of the Basic Allowance.

        Participant means an active Employee or a former Employee who, at time
        -----------
of his Termination of Employment, retirement or death was employed by the
Company, ARCO, ARCO Chemical Company, or LCR and who is entitled to receive
benefits under this Plan by reason of his having (a) received one or more Awards
during the computation period that would be used in computing the Employee's
Average Final Base Pay under the Retirement Plans if the Awards were recognized
as a part of Base Pay under the Retirement Plans; (b) deferred a portion of his
Salary during the computation period that would be used in calculating the
Employee's Average Final Base Pay under the Retirement Plans if the Deferred
Salary were recognized as a part of Base Pay under the Retirement Plans; (c) had
his benefit under the Retirement Plans reduced due to required limitations under
the Code or ERISA; (d) been granted a benefit described in Section 2.6(a) in
connection with a change in control of Lyondell Petrochemical Company; and/or
(e) been granted a Special Supplement pursuant to Section 2.6(b) of this Plan;
and shall include a former Employee who has not received the entire benefit to
which he is entitled under this Plan.

        Plan means this Supplementary Executive Retirement Plan of Lyondell
        ----                                                               
Petrochemical Company.

        Pre-Retirement Annuity means the annuity paid under the Retirement Plans
        ----------------------                              
to a survivor, that is attributable to Company contributions and that is payable
on account of the Member's death prior to commencing a retirement allowance and
following attainment of entitlement to a retirement allowance derived from
Company contributions.

        Prior Plan means this Plan as in effect prior to its amendment and
        ----------                                                  
restatement in the form of this Plan.

        Proration Percentage means the percentage calculated in accordance with
        --------------------     
Section 2.3 of this Plan.

                                       4
<PAGE>
 
        Qualified Limitation Supplement means a Supplementary Benefit as
        -------------------------------          
described under Section 2.5 of this Plan.

        Retirement Plan means the Lyondell Petrochemical Company Retirement Plan
        ---------------         
for Non-Represented Employees.

        Retirement Plans means the Lyondell Petrochemical Company Retirement
        ----------------              
Plan for Non-Represented Employees and any other defined benefit, tax-qualified
retirement plan, other than any such plan maintained exclusively or primarily
for the benefit of employees represented by collective bargaining units, as
defined in Section 3(35) of ERISA and Section 401(a) of the Code, maintained by
the Company, ARCO or ARCO Chemical Company.

        Salary means the Employee's regular base salary paid by the Company,
        ------                
ARCO, ARCO Chemical Company, and/or LCR, but excluding Awards and any other
special or additional compensatory payments made by any such companies.

        Special Supplement means a supplementary retirement benefit approved for
        ------------------      
payment to an Employee under Section 2.6(a) or Section 2.6(b) of this Plan.

        Subsidiary or Affiliate means:
        -----------------------------
        (a)  Any corporation, other than ARCO, that is a member of a controlled
group of corporations within the meaning of Section 1563(a) of the Code
(determined without regard to Section 1563(a)(4) and Section 1563(e)(3)(C) of
said Code) and of which Lyondell Petrochemical Company is then a member, and
        
        (b)  All trades or businesses, other than ARCO, whether or not
incorporated, which, under the regulations prescribed by the Secretary of the
Treasury pursuant to Section 210(d) of ERISA, are then under common control with
Lyondell Petrochemical Company.

        Supplementary Benefit means any of the types of supplementary benefits
        ---------------------   
provided in Sections 2.4 or 2.5 of this Plan.

        Supplementary Benefits means, collectively, all Supplementary Benefits
        ----------------------       
provided by this Plan, or all of such Supplementary Benefits to which a
particular Participant is entitled, as the context requires.

        Survivor Benefit means any survivor benefit that is payable to a
        ----------------      
Participant's Beneficiary under the provisions of Article II.

        Termination of Employment or Terminate Employment means a cessation of
the performance of services as an employee for the Company, ARCO, ARCO Chemical
Company, LCR or any Subsidiary or Affiliate of any of said companies; provided,
                                                                      -------- 
however, that in no event
- -------                                                 
   
                                       5
<PAGE>
 
will an individual be considered to have Terminated Employment for purposes of
this Plan solely by reason of a change in the identity of his employer due to a
sale of substantially all of the assets at which, or of the stock of the entity
by which, such individual was employed immediately prior to such sale, in any
case in which such individual continues, after such sale, to perform for the
purchaser substantially the same services as he performed immediately prior to
such sale.

                                       6
<PAGE>
 
                                  ARTICLE II

                             SUPPLEMENTARY BENEFITS


SECTION 2.1  TYPES OF SUPPLEMENTARY BENEFITS PROVIDED. This Plan provides for
the following types of Supplementary Benefits:

        (a)  Deferral/Incentive Supplements, as described in Section 2.4; and

        (b)  Qualification Limitation Supplements, as described in Section 2.5,

        In addition, the Plan provides for the discretionary award of Change in
Control Supplements, as described in Section 2.6(a) and Special Supplements as
described in Section 2.6(b).

SECTION 2.2  ELIGIBILITY IN GENERAL.

        (a)  ELIGIBILITY FOR PARTICIPANT'S BENEFIT. An Employee who either (i)
retires on an allowance from the Retirement Plans that commences immediately, or
that could have commenced immediately, upon his Termination of Employment; (ii)
terminates employment with a nonforfeitable right to an allowance from the
Retirement Plans commencing on a later date, or (iii) who has a non-forfeitable
right to an allowance from the Retirement Plan at the time of a Change in
Control shall automatically be eligible for each type of Supplementary Benefit
provided by Sections 2.4 and 2.5 with respect to which he satisfies the specific
eligibility requirements prescribed in the applicable Section of the Plan.
Supplementary Benefits to which a Participant is entitled shall be paid in the
form and at the time provided under Articles III and IV, respectively, without
the necessity for filing an application for such benefits.

        (b)  ELIGIBILITY FOR SURVIVOR'S BENEFIT. In the event of a Participant's
death prior to the commencement of any Supplementary Benefit to which such
Participant is entitled, any person who is designated by such Participant as his
Beneficiary will be eligible to receive the Survivor Benefit that relates to the
particular Supplementary Benefit to which such Participant was entitled;
provided, however, that the Participant must designate the
- --------  -------                                         
same person as his Beneficiary for purposes of all Survivor Benefits payable
under this Plan with respect to such Participant. Survivor Benefits to which
such Beneficiary is entitled under this Article will automatically be paid to
such person without the necessity for filing an application. In the case of the
Participant's death prior to commencement of any such Supplementary Benefits
without his having designated a Beneficiary, the Beneficiary shall be the
Participant's spouse if the Participant was married at the time of death, and
the Participant's estate if the Participant was single at the time of death. In
the event of a Participant's death after the commencement of benefits under this
Plan in a form that provides for the continuation of payments after such
Participant's death, such payment of benefits shall continue in accordance with
the terms and provisions of such form of benefit, unless otherwise required
under Article V.

                                       7
<PAGE>
 
SECTION 2.3  AMOUNT OF SUPPLEMENTARY BENEFITS (OR SURVIVOR BENEFIT) IN GENERAL.

     (a)  The total amount of a Participant's Supplementary Benefits (or
Survivor Benefits, if applicable) payable under this Plan shall be the sum of
the Participant benefits to which such Participant is entitled (or Survivor
Benefits to which such Participant's Beneficiary is entitled, if applicable)
under all types of Supplementary Benefits whose requirements are satisfied by or
with respect to such Participant.

     (b)  The benefits provided by this Plan are designated to coordinate with
corresponding benefits provided by the Atlantic Richfield Company Supplementary
Executive Retirement Plan ("ARCO SERP") and the ARCO Chemical Company
Supplementary Executive Retirement Plan ("ARCO Chemical SERP"). Accordingly,
with respect to each type of Supplementary Benefit provided by this Plan, the
amount of Participant or Survivor Benefit, as applicable, payable by this Plan
is a portion of the sum of separate, identical Supplementary Benefits prescribed
under each applicable provision of this Plan, and related provisions pertaining
to the same type of benefit under the ARCO SERP and the ARCO Chemical SERP.
Therefore, the determination of the amount of each type of Supplementary Benefit
payable to or with respect to any Participant from this Plan entails the
calculation of the aggregate Supplementary Benefits payable from all three of
such plans, followed by the allocation of a prorata portion of each such
aggregate Supplementary Benefit to this Plan, as described hereinafter, which
prorata portion is the benefit payable by this Plan with respect to that
particular type of Supplementary Benefit.

          The portion of such aggregate Supplementary Benefit of each type that
is payable to a Participant from this Plan is his "Proration Percentage" of his
"Excess Retirement Benefit," as such terms are described herein. A Participant's
Proration Percentage with respect to each type of Supplementary Benefit shall be
the percentage that is equivalent to a fraction of which the numerator is the
number of years of service credited to the Participant for benefit accrual
purposes under the Retirement Plan and any other tax-qualified, defined benefit
retirement plan maintained by the Company, and the denominator of which is the
total number of years of service credited to the Participant for benefit accrual
purposes under the Retirement Plans.

          A Participant's "Excess Retirement Benefit" means the excess of:

          (1)  such Participant's "Hypothetical Amount" as defined separately
for purposes of each type of Supplementary Benefit; over

          (2)  the amount of monthly allowance the Participant is actually
entitled to receive at retirement, in the form of the Basic Allowance, from the
Retirement Plans.

                                       8
<PAGE>
 
SECTION 2.4.  DEFERRAL/INCENTIVE SUPPLEMENT.

     (a)  ELIGIBILITY FOR DEFERRAL/INCENTIVE SUPPLEMENT.  An Employee shall be
eligible for a Participant's Deferral/Incentive Supplement under the Plan if his
Excess Retirement Benefit described in Section 2.4(b)(1)(ii) below is a positive
amount. If a Participant who is entitled to receive a Deferral/Incentive
Supplement dies prior to commencing receipt of such benefit, his Beneficiary
will be paid a monthly Survivor Benefit described in Section 2.4(b)(2) below.

     (b)  AMOUNT OF DEFERRAL/INCENTIVE SUPPLEMENT.

          (1)  PARTICIPANT'S BENEFIT. Subject to Sections 2.4(b)(3), and 2.4(c),
(d) and (e) below, the monthly amount of the Participant's Deferral/Incentive
Supplement shall be:

               (i)   such Participant's Proration Percentage, multiplied by:

               (ii)  his Excess Retirement Benefit which, for purposes of the
Deferral/Incentive Supplement, means (A) minus (B) where:

                     (A)  is such Participant's Hypothetical Amount, which, for
this purpose, means the amount of monthly allowance the Participant would have
received at retirement, in the form of the Basic Allowance, from the Retirement
Plans if the Base Pay used in calculating such monthly allowance under the
Retirement Plans had included the Participant's Awards and Deferred
Compensation, and

                     (B)  is the amount of monthly retirement allowance such
Participant is actually entitled to receive at retirement, in the form of the
Basic Allowance, under the Retirement Plans.

          (2)  SURVIVOR BENEFIT. The monthly amount of the Survivor Benefit
payable with respect to a Participant who dies while entitled to but before
commencing receipt of a Deferral/Incentive Supplement under this Plan shall be:

               (i)   such Participant's Proration Percentage, multiplied by:

               (ii)  (A) minus (B), where:

                     (A)  is the monthly Pre-Retirement Annuity that would be
payable with respect to such Participant from the Retirement Plans if it were
calculated on the basis of the Participant's Hypothetical Amount described in
Section 2.4(b)(1)(ii)(A), and

                     (B)  is the monthly amount of Pre-Retirement Annuity
actually payable with respect to such Participant from the Retirement Plans.

                                       9
<PAGE>
 
          (3)  SPECIAL RULE FOR CERTAIN PARTICIPANTS. For purposes of
calculating the Hypothetical Amount described in Section 2.4(b)(1)(ii)(A), if
the Participant transferred directly on or after July 1, 1993 from the
employment of the Company to the employment of LCR, such calculation will take
into account any Awards made to and deferred compensation elected by such
Participant during or with respect to his employment by LCR, on the same basis
that salary earned by the Participant while employed by LCR is taken into
account in determining the Participant's benefits under the Retirement Plan.

          (4)  NO PRORATION FOR CERTAIN PORTION OF DEFERRAL/INCENTIVE
SUPPLEMENT. Notwithstanding the provisions of Sections 2.4(b)(1) and (2) above,
the portion of a Participant's Deferral/Incentive Supplement that is
attributable to his period of service with LCR (including any Awards, deferrals
of Salary, and/or limitations on his retirement benefits under the defined
benefit tax-qualified retirement plan maintained by LCR) shall not be prorated
under the provisions of Section 2.4(b)(1), nor shall any related Survivor
Benefit payable with respect to such a Participant be prorated under the
provisions of Section 2.4(b)(2). Accordingly, the portion of a Participant's
Hypothetical Amount that is attributable to period of service with LCR shall be
subtracted from his total Hypothetical Amount before the balance of such
Hypothetical Amount is subjected to the proration procedure described in
Sections 2.4(b)(1) and (2); and any such Participant's Deferral/Incentive
Supplement (or related Survivor Benefit, as applicable), to the extent
attributable to his period of service with LCR shall be payable entirely from
this Plan.

     (C)  MAXIMUM LIMITATION ON DEFERRAL/INCENTIVE SUPPLEMENT BENEFITS.

          (1)  Notwithstanding the provisions of Paragraphs (a) and (b) of this
Section 2.4, the amount of Deferral/Incentive Supplement payable to a
Participant (or Survivor Benefit payable with respect to such Participant, as
applicable) shall be limited to the extent necessary so that the total annual
benefits payable to or with respect to such Participant (i) from the Retirement
Plans under the form of allowance elected under the Retirement Plans; (ii) as a
Qualification Limitation Supplement, if any, payable under Section 2.5 of this
Plan; (iii) as a Deferral/ Incentive Supplement, payable under this Section 2.4;
and (iv) added to the sum of any corresponding deferral/incentive supplementary
benefits to which such Participant is entitled under the ARCO SERP and/or the
ARCO Chemical SERP, will not exceed 65 percent of the greater of (i) the sum of
the Participant's annual Salary as of his Termination of Employment plus his
most recent Award, or (ii) the average, during the Participant's prior ten years
of employment with the Company, ARCO, ARCO Chemical Company and/or LCR, of the
Participant's highest 3 consecutive years of Salary and Awards during each year.

          (2)  Annuities resulting from voluntary employee contributions to the
Retirement Plans and increased benefits resulting from election of a Level
Income Option under the Retirement Plans shall not be considered in applying the
foregoing limitations.

     (D)  COMPUTATION PROCEDURE. For purposes of computing the amount of monthly
benefit payable as a Deferral/Incentive Supplement under Sections 2.4(b)(1) or
2.4(b)(2), as

                                      10
<PAGE>
 
applicable, it shall be assumed that an Award has been made with respect to the
calendar year in which a Change in Control occurred or in which a Participant's
Termination of Employment or death occurs that is equal in amount to a prorata
share of the Award, if any, made with respect to the calendar year immediately
preceding such event. If the Participant receives an Award following Termination
of Employment and after commencement of a Deferral/Incentive Supplement, such
benefits shall be re-calculated, using the actual Award granted subsequent to
the Participant's Termination of Employment rather than the Award calculated on
the prorata basis; provided, however, that such re-calculation shall not result
                   --------  -------                                    
in a reduction of the Deferral/Incentive Supplement that has commenced. If a
Participant receives an Award following a Change in Control, benefits shall not
be recalculated.

     (E)     TERMINATION OF EMPLOYMENT. Unless a Participant, at the time of his
Termination of Employment or at the time of a Change in Control, is eligible for
an immediate or deferred retirement allowance from the Retirement Plans or
unless a Survivor Benefit is payable under Section 2.4(b)(2) by reason of the
death of the Participant, rights of the Participant, and any person claiming
under or by right of the Participant, to any Deferral/Incentive Supplement
benefits shall cease.

SECTION 2.5  QUALIFICATION LIMITATION SUPPLEMENT.

     (a)     ELIGIBILITY FOR QUALIFICATION LIMITATION SUPPLEMENT. An Employee
shall be eligible for a Participant's Qualification Limitation Supplement under
this Plan if his Excess Retirement Benefit described in Section 2.5(b)(1)(ii) is
a positive amount. If a Participant who is entitled to receive a Qualification
Limitation Supplement dies prior to commencing receipt of such benefit, his
Beneficiary will be paid a monthly Survivor Benefit described in Section
2.5(b)(2) below.

     (b)     AMOUNT OF QUALIFICATION  LIMITATION SUPPLEMENT.

             (1)  PARTICIPANT'S BENEFIT. The monthly amount of the Participant's
Qualification Limitation Supplement shall be:

                  (i)   such Participant's Proration Percentage, multiplied by:

                  (ii)  his Excess Retirement Benefit which, for purposes of
this Qualification Limitation Supplement, means (A) minus (B) where:

                        (A)  is such Participant's Hypothetical Amount, which,
for this purpose, means the amount of monthly allowance the Participant would
have received, at retirement, in the form of the Basic Allowance, from the
Retirement Plans if the amount of the Participant's retirement allowance under
such plans, on which such annuity is based, were not subject to limitations or
reductions required under the Code or ERISA, and

                                      11
<PAGE>
 
                        (B)  is the amount of monthly allowance such Participant
is actually entitled to receive at retirement, in the form of the Basic
Allowance, from the Retirement Plans.

                                      12
<PAGE>
 
          (2)  SURVIVOR BENEFIT. The monthly amount of the Survivor Benefit
payable with respect to a Participant who dies while entitled to but before
commencing receipt of a Qualification Limitation Supplement under this Plan
shall be:

               (i)   such Participant's Proration Percentage, multiplied by:

               (ii)  (A) minus (B), where:

                     (A)  is the monthly Pre-Retirement Annuity that would be
payable from the Retirement Plans if the amount of the Participant's retirement
allowance under such plans, on which such annuity is based, were not subject to
limitations or reductions required under the Code or ERISA, and

                     (B)  is the actual monthly Pre-Retirement Annuity Payable
from the Retirement Plans with respect to such Participant.

SECTION 2.6  SPECIAL SUPPLEMENTS.

     (a)      CHANGE IN CONTROL SUPPLEMENT.

              (1)  ELIGIBILITY FOR CHANGE IN CONTROL SUPPLEMENT. An Employee is
eligible for a Change in Control Supplement if his Termination of Employment
occurs under circumstances that entitle him to receive benefits provided under
Section 3 of an Executive Severance Agreement entered into between such Employee
and the Company.

              (2)  AMOUNT OF CHANGE IN CONTROL SUPPLEMENT.

                   (i)  PARTICIPANT'S BENEFIT. A Participant who is eligible
under Section 2.6(a)(1) for a Change in Control Supplement will receive a
monthly benefit that is:

                        (A)  such Participant's Proration Percentage, multiplied
by:

                        (B)  his Excess Retirement Benefit which, for purposes
of this Change in Control Supplement means, (I) minus (II) where:

                             (I)   is such Participant's Hypothetical Amount, as
defined in Section 2.6(a)(2)(i)(C) below, and

                             (II)  is the aggregate amount of monthly allowance
the Participant is actually entitled to receive from this Plan (other than any
Change in Control Supplement to which a Participant is entitled by reason of
this Section 2.6(a)), and from the Retirement Plans, determined as of such
Participant's Eligible Termination Date, in the form of the Basic Allowance
under the Retirement Plans.

                                      13
<PAGE>
 
               (C)  HYPOTHETICAL AMOUNT. For purposes of determining the amount
of a Change of Control Supplement, an Participant's Hypothetical Amount shall be
the amount of monthly allowance he would have been entitled to receive from this
Plan (other than any Change in Control Supplement to which a Participant is
entitled by reason of this Section 2.6(a)), and from the Retirement Plans in the
form of a Basic Allowance under the Retirement Plans, determined as of his
Eligible Termination Date, if such Basic Allowance were calculated as though:

                         (I)    Such Participant's age were 5 years greater than
his actual age at such time;

                         (II)   such Participant had been credited for benefit
accrual purposes with 5 additional years of service; provided, however, that if
                                                     --------  ------- 
such Participant is age 60 or older at his Eligible Termination Date, the
additional years of service for benefit accrual shall be the number of years
(including fractional years) remaining until he reaches the age of 65 years; and

                         (III)  such Participant's average final compensation
taken into account under the Retirement Plans were the sum of:

                                (x)  his annualized Salary (as in effect on his
Eligible Terminate Date); and

                                (y)  the greatest of:

                                     (i)   his Award for the most recent plan
year (as defined in the applicable plans);

                                     (ii)  the average of his Awards for his
last 3 calendar years of employment with the Company, ARCO, ARCO Chemical
Company and/or LYONDELL-CITGO Refining Company, Ltd.; or

                                     (iii) the average amount of Awards and
Deferred Compensation that would be used in the calculation of the Deferral
Incentive Supplement in Section 2.4(b)(1)(ii)(A) above;

                    For purposes of determining a Participant's "average final
compensation" under Section 2.6(a)(2)(i)(C)(III), in the case of a Participant
who is subject to a "Constructive Termination for Good Reason" (as such term is
defined in an Executive Severance Agreement entered into between such
Participant and the Company) because (a) his Salary was reduced, then in lieu of
his "annualized Salary as in effect on his Eligible Termination Date" described
in subclause (III)(x) above, his annual Salary as in effect immediately before
such reduction of his Salary shall be used for purposes of such subclause
(III)(x); and/or (b) his Award was reduced as a result of an adverse change in
plan terms, then in lieu of his "Award for the most 

                                      14
<PAGE>
 
recent plan year" as described in subclause (III)(y)(i) above, his Award as in
effect immediately before such reduction of his Award shall be used for purposes
of subclauses (III)(y)(i), (ii) and (iii).

               (ii)  SURVIVOR BENEFIT. The monthly amount of the Survivor
Benefit payable under this Plan with respect to a Participant who dies both
while entitled to a Change in Control Supplement and before commencing receipt
of such Change in Control Supplement, shall be:

                     (A) such Participant's Proration Percentage, multiplied by:

                     (B) (I) minus (II), where:

                         (I)  is the monthly Pre-Retirement Annuity that would
be payable with respect to the Participant from this Plan (other than any Change
in Control Supplement to which the Participant is entitled by reason of Section
2.6(a), and from the Retirement Plans if it were calculated on the basis of the
Participant's Hypothetical Amount described in Section 2.6(a)(2)(i)(C), and

                         (II) is the monthly amount of Pre-Retirement Annuity
actually payable with respect to such Employee under this Plan (other than any
Change in Control Supplement to which the Participant is entitled by reason of
Section 2.6(a), and from the Retirement Plans.

          (3)  FORM AND TIMING OF CHANGE IN CONTROL SUPPLEMENT. If, at the time
of his Termination of Employment, a Participant is entitled to a Change in
Control Supplement, the Change in Control Supplement shall be paid immediately
after his Termination of Employment in a lump sum cash payment. The provisions
of this Paragraph 3 shall apply both to such Participant's benefit and to a
Survivor Benefit payable with respect to such Participant.

     (b)  OTHER SPECIAL SUPPLEMENTS. In addition to any other Supplementary
Benefits and/or Change in Control Supplement to which an Employee may be
entitled under this Plan, at its sole discretion the Compensation Committee of
the Board of Directors of Lyondell Petrochemical Company may award a Special
Supplement to any Employee in such amount, or to be computed on such basis, as
it may determine. Such awards may be granted for any reason deemed appropriate
by such Compensation Committee, including without limitation, recognition of all
or any part of the Employee's years of service with an organization or entity
acquired by, or merged into, Lyondell Petrochemical Company, any of its
Subsidiaries or Affiliates, or by any predecessor company of Lyondell
Petrochemical Company or any of its Subsidiaries or Affiliates. In no event
shall a Special Supplement be granted under the Plan to or on account of any
Employee who is not a member of a select group of management or other highly
compensated employees as defined from time to time by the Compensation
Committee. A certified copy of the resolutions granting a Special Supplement
shall be furnished to the Administrative Committee prior to the date any payment
on account thereof is to be made under the Plan. The form, the time of
commencement, 

                                      15
<PAGE>
 
the duration of any periodic payments,

                                      16
<PAGE>
 
and any other relevant factors affecting the Company's obligation for providing
a Special Supplement to an Employee, or any related Survivor Benefit to such
Employee's Beneficiary if such benefit is specified by such Compensation
Committee, shall be determined in the sole discretion of the aforementioned
Compensation Committee and shall be set forth in the certified copy of the
resolutions furnished to the Administrative Committee.

                                      17
<PAGE>
 
                                  ARTICLE III
                                        
                                FORM OF BENEFIT


SECTION 3.1. SUPPLEMENTARY BENEFITS.

        (a)  OPTIONAL FORMS OF BENEFIT.  Except as provided in Article V, the
Participant may elect to receive payment of his Supplementary Benefits described
in Sections 2.4 and 2.5 in any form available for payment of the normal
retirement benefit under the Retirement Plan, provided that (1) the same form of
payment must be elected for all Supplementary Benefits to which such Participant
is entitled and (2) if the Participant elects a form of annuity for such
Supplementary Benefits and under the Retirement Plan, then he must elect the
same form of annuity under this Plan and the Retirement Plans.

        (b)  ELECTIONS.

             (1)   The Participant must elect the form of payment of his
Supplementary Benefit within the time period, and on the election form,
prescribed by the Administrative Committee and communicated to the Participant
in advance of the date the Participant is eligible to commence Supplementary
Benefit payments.

             (2)   If the Participant fails to file an election of the form of
Supplementary Benefit payment within the time period designated by the
Administrative Committee, then upon retirement the Participant may only elect
one of the forms of annuity then available under the Retirement Plan. Absent an
election of a specific form of annuity at the time of retirement, the
Participant will receive (i) an annuity payment in the form of a Fifty Percent
Joint and Survivor Annuity, with the surviving spouse as the Beneficiary, if the
Participant is married at the time of retirement, or (ii) an annuity in the form
of the Basic Allowance, if the Participant is single at the time of retirement.

             (3)   If the Participant makes an election of the form of payment
of his benefit within the time period designated by the Administrative Committee
and subsequently wishes to change such election prior to commencement of the
benefit or, in the case of an annuity form of payment under which payments have
commenced, to receive the Actuarial Equivalent of the remaining annuity
installments, then he may request, by written application to the Administrative
Committee, to change the form of payment previously elected, (i) without any
reduction in, or imposition of any penalty on, the amount of Supplementary
Benefits to which the Participant is entitled under the Plan, provided that the
Administrative Committee determines that the Participant has experienced a
Financial Hardship justifying the request for a change of election, or (ii) the
Administrative Committee, in its sole discretion, determines that it is
appropriate to grant the Participant's request.

                                      18
<PAGE>
 
             (4)   The Participant may elect the form of payment of the Survivor
Benefit that is payable in the event of the Participant's death prior to
commencement of his benefit. If the Participant fails to make the election,
payment to the Beneficiary will be in the form of a life annuity, payable for
the life of Beneficiary and having a value equal to the Actuarially Equivalent
value of such Survivor Benefit payable in any other available form for payment.
However, the Beneficiary may request the Administrative Committee to change the
Participant's prior election provided that the Administrative Committee makes a
finding as described in either clause (i) or (ii) under Section 3.1(b)(3).

SECTION 3.2 SPECIAL SUPPLEMENTS. The form of payment of any Special Supplement
described in Section 2.6(b), including any Survivor Benefit provisions, shall be
determined by the Compensation Committee of the Board of Directors of Lyondell
Petrochemical Company and prescribed in such Committee's resolutions conferring
such benefit.

                                      19
<PAGE>
 
                                  ARTICLE IV

                         TIMING OF PAYMENT OF BENEFIT


SECTION 4.1  SUPPLEMENTARY BENEFITS.

        (a)  Supplementary Benefits payable to a Participant under Sections 2.4
and 2.5 shall commence at the same time as the Participant's benefits commence
under the Retirement Plan; provided, however, that the Participant may
                           --------  -------                          
elect that the Survivor Benefit payable upon his death prior to commencement of
benefits under Section 2.4 and 2.5 be paid immediately following his death in
the form of a Lamb Sum, rather than being paid on the Participant's earliest
retirement eligibility date; and provided, further, that if the Participant
                                 --------  -------
elects to take his benefit as a Lump Sum the benefit shall be payable in
accordance with the applicable procedures established by the Administrative
Committee.

        (b)  Survivor Benefits payable under Sections 2.4(b)(2) and 2.5(b)(2)
shall normally be paid in one of the optional forms of payment available under
the Retirement Plan, with payments commencing on the earliest date the
Participant would have become eligible to begin receiving a retirement
allowance under such Retirement Plan; provided, however, that the
                                      --------  -------          
Beneficiary may elect to receive a Lump Sum payment of the Actuarial Equivalent
of the Basic Allowance at the time of the Participant's death, subject to the
requirements described in Section 3.1(b)(4).

SECTION 4.2  SPECIAL SUPPLEMENTS.

        Any Special Supplement payable under Section 2.6(b) shall be payable at
the time or times determined by the Compensation Committee of the Board of
Directors of Lyondell Petrochemical Company and prescribed in such Committee's
resolutions conferring such benefit.

                                      20
<PAGE>
 
                                   ARTICLE V

                         BENEFITS ON CHANGE IN CONTROL


SECTION 5.1  EVENTS CONSTITUTING A "CHANGE IN CONTROL".
             ----------------------------------------- 

       For purposes of this Plan, a Change in Control will be deemed to have
occurred as of the date that one or more of the following occurs:

        (a)  Individuals who, as of the date hereof, constitute the entire Board
of Directors of the Company ("Incumbent Directors") cease for any reason to
constitute at least a majority of the Board; provided, however, that any
                                             --------  --------          
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by the Company's shareholders, was approved by a vote of
at least a majority of the then Incumbent Directors shall be considered as
though such individual was an Incumbent Director, but excluding, for this
purpose any such individual whose initial assumption of office occurs as a
result of either an actual or threatened election contest, as such terms are
used in Rule 14a-11 under the Exchange Act or other actual or threatened
solicitation of proxies or consents by or on behalf of any Person (as defined
below) other than the Board; provided, further, that in the event ARCO at any
                             --------  -------
time determines to achieve minority representation on the Company's Board of
Directors approximately equal to its then ownership percentage of the Company's
common stock, its implementation of such determination through the election of
ARCO employees as directors of the Company shall not be deemed to be a Change in
Control and such ARCO employees shall constitute Incumbent Directors;

        (b)  The stockholders of the Company shall approve (A) any merger,
consolidation or recapitalization of the Company (or, if the capital stock of
the Company is affected, any subsidiary of the Company), or any sale, lease, or
other transfer (in one transaction or a series of transactions contemplated or
arranged by any party as a single plan) of all or substantially all of the
assets of the Company (each of the foregoing being an "Acquisition Transaction")
where (1) the shareholders of the Company immediately prior to such Acquisition
Transaction would not immediately after such Acquisition Transaction
beneficially own, directly or indirectly, shares or other ownership interests
representing in the aggregate 80 percent or more of (a) the then outstanding
common stock or other equity interests of the corporation or other entity
surviving or resulting from such merger, consolidation or recapitalization or
acquiring such assets of the Company, as the case may be (the "Surviving
Entity") (or of its ultimate parent corporation or other entity, if any), and
(b) the Combined Voting Power of the then outstanding Voting Securities of the
Surviving Entity (or of its ultimate parent corporation or other entity, if any)
or (2) the Incumbent Directors at the time of the initial approval of such
Acquisition Transaction would not immediately after such Acquisition Transaction
constitute a majority of the Board of Directors, or similar managing group, of
the Surviving Entity (or of its ultimate parent corporation or other entity, if
any), or (B) any plan or proposal for the liquidation or dissolution of the
Company;

                                      21
<PAGE>
 
        (c)  Any Person except for ARCO shall be or become the beneficial owner
(as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
indirectly, of securities of the Company representing in the aggregate more than
twenty percent (20%) of either (A) the then outstanding shares of common stock
of the Company ("Common Shares") or (B) the Combined Voting Power of all then
outstanding Voting Securities of the Company; provided, however, that
                                              --------  -------
notwithstanding the foregoing, a "Change of Control" shall not be deemed to have
occurred for purposes of this Subsection (c);

             (1)   Solely as a result of an acquisition of securities by the
Company which, by reducing the number of Common Shares or other Voting
Securities outstanding, increases (a) the proportionate number of Common Shares
beneficially owned by any Person to more than 20 percent of the Common Shares
then outstanding, or (b) the proportionate voting power represented by the
Voting Securities beneficially owned by any Person to more than 20 percent of
the Combined Voting Power of all then outstanding Voting Securities; or

             (2)   Solely as a result of an acquisition of securities directly
from the Company except for any conversion of a security that was not acquired
directly from the Company, provided, further, that if any Person referred
                           --------  -------                             
to in paragraph (1) or (2) of this Subsection (c) shall thereafter become the
beneficial owner of any additional Common Shares or other Voting Securities of
the Company (other than pursuant to a stock split, stock dividend or similar
transaction), then a "Change of Control" shall be deemed to have occurred for
purposes of this Subsection (c); or

        (d)  ARCO shall become the owner, directly or indirectly, of securities
of the Company representing in the aggregate more than 50 percent of either (i)
the then outstanding Common Shares or (ii) the Combined Voting Power of all then
outstanding Voting Securities of the Company except as the result of an
acquisition of securities by the Company which, by reducing the number of Common
Shares or other Voting Securities outstanding, increases (x) the proportionate
number of Common Shares beneficially owned by ARCO to more than 50 percent of
the Common Shares then outstanding, or (y) the proportionate voting power
represented by the Voting Securities beneficially owned by ARCO to more than 50
percent of the Combined Voting Power of all then outstanding Voting Securities;
provided, however, that if thereafter ARCO becomes the beneficial owner of any
- --------  -------         
additional Common Shares or other Voting Securities of the Company (other than
pursuant to a stock split, stock dividend or similar transaction) the
exception provided above shall no longer apply; provided, further, that for
                                                --------  -------          
purposes of this Subsection (d), neither record ownership of common stock of the
Company by the Trustee for ARCO's 401(a) qualified plans nor beneficial
ownership of common stock of the Company by any of ARCO's directors for their
personal account shall be deemed to constitute "indirect" ownership of common
stock of the Company by ARCO; provided, further, that notwithstanding any
                              --------  -------                          
contrary provision of the Plan, no Change in Control shall be deemed to have
occurred pursuant to this Subsection (d) if as a result of an inadvertent act
ARCO becomes the owner, directly or indirectly, of additional Common Shares or
Voting Securities and such securities are sold or otherwise disposed of by ARCO
within 30 days after ARCO discovers, or is notified by the Company as to, the
potential Change of Control resulting from such ownership, so that, as result of
such subsequent sale or other
     
                                      22
<PAGE>
 
disposition by ARCO, no Change in Control would otherwise be deemed to have
occurred pursuant to the terms (excluding this proviso) of this Subsection (d).

        Notwithstanding any of the foregoing, no Change in Control shall be
deemed to have occurred as a result solely of (i) the registration by ARCO of
the Exchangeable Notes pursuant to the Registration Statement, (ii) the issuance
and sale by ARCO of the Exchangeable Notes to the underwriters in accordance
with the Registration Statement, or (iii) prior to the maturity of the
Exchangeable Notes, purchases and sales of the Exchangeable Notes.

SECTION 5.2  AMOUNT OF BENEFIT ON CHANGE IN CONTROL.

        The amount of Supplementary Benefits of each type payable under Sections
2.4 and 2.5, including Survivor Benefits and the Basic Allowance used in those
Sections shall be determined by using the number of years of service credited to
the Participant at the time of the Change in Control and the Base Pay in effect
immediately prior to the Change in Control. Service and Base Pay following
Change in Control shall be disregarded for purposes of calculating the amount of
Supplementary Benefits payable under this Plan.

SECTION 5.3  FORM OF BENEFIT ON CHANGE IN CONTROL.

        A Participant's Supplementary Benefits and any Survivor Benefit
described in Article II shall be paid in a Lump Sum.

SECTION 5.4  TIME OF PAYMENT ON CHANGE IN CONTROL.

        Supplementary Benefits under Sections 2.4 and 2.5, Change in Control
Supplement, and any Special Supplement under 2.6 shall be payable immediately
following a Change in Control, unless the Participant has previously elected an
alternate payment commencement date, as established under the Administrative
Committee procedures.

                                      23
<PAGE>
 
                                  ARTICLE VI
                                                                               
                                ADMINISTRATION


SECTION 6.1  ADMINISTRATIVE COMMITTEE.

        The Benefits Administrative Committee of Lyondell Petrochemical Company
shall act as the Administrative Committee of this Plan.

SECTION 6.2  RULES OF CONDUCT; ADMINISTRATIVE PROVISIONS.

        The Administrative Committee shall adopt such rules or the conduct of
its business and the administration of this Plan as it considers desirable;
provided, however, that such rules shall not conflict with the provisions of
- --------  -------                                                           
this Plan. Except as otherwise specifically provided in this Plan, all of the
administrative provisions (such as the benefit claims procedures) contained in
the Lyondell Petrochemical Company 401(k) and Savings Plan shall be applicable
to the administration of this Plan.

SECTION 6.3  LEGAL, ACCOUNTING, CLERICAL AND OTHER SERVICES.

        The Administrative Committee may authorize one or more of its members or
any agent to act on its behalf and may contract for legal, accounting, clerical
and other services to carry out this Plan. All expenses of the Administrative
Committee shall be paid by the Company.

SECTION 6.4  INTERPRETATION OF PROVISIONS.

        The Administrative Committee shall have the exclusive right and
discretionary authority to interpret the provisions of this Plan and to decide
questions arising in its administration. The decisions and interpretations of
the Administrative Committee shall be final and binding on the Company,
Employees and all other persons.

SECTION 6.5  RECORDS OF ADMINISTRATION.

        The Administrative Committee shall keep records reflecting the
administration of this Plan, which shall be subject to audit by the Company.

                                      24
<PAGE>
 
SECTION 6.6  DENIAL OF CLAIM.


        The Administrative Committee shall provide adequate notice in writing to
any Participant or Beneficiary whose claim for benefits under this Plan has been
denied, setting forth the specific reasons for such denial. The Participant or
Beneficiary will be given an opportunity for a full and fair review by the
Administrative Committee of the decision denying the claim. The Participant or
Beneficiary shall be given 60 days from the date of the notice denying any such
claim within which to request such review.

SECTION 6.7  LIABILITY OF COMMITTEE.

        No member of the Administrative Committee shall be liable for any action
taken in good faith or for exercise of any power given the Administrative
Committee, or for the actions of other members of said Administrative Committee.

                                      25
<PAGE>
 
                                  ARTICLE VII
                                                                                
                   FACILITY OF PAYMENT AND LAPSE OF BENEFITS


SECTION 7.1  PROVISIONS FOR INCAPACITY.

        If the Administrative Committee deems any person who is entitled to
receive any payment under the provisions of this Plan to be incapable of
receiving or disbursing the same by reason of minority, illness or infirmity,
mental incompetence, or incapacity of any kind, the Administrative Committee
may, in its sole discretion, take any one or more of the following actions: it
may apply such payment directly for the comfort, support and maintenance of such
person; it may reimburse any person for any such support previously supplied to
the person entitled to receive any such payment; or it may pay such payment to
any other person selected by the Administrative Committee to disburse such
payment for the comfort, support and maintenance of the person entitled thereto,
including, without limitation, to any relative who has undertaken, wholly or
partially, the expense of such person's comfort, care and maintenance, or any
institution in whose care or custody the person entitled to the payment may be.
The Administrative Committee may, in its sole discretion, deposit any payment
due to a minor to the minor's credit in any savings or commercial bank of the
Administrative Committee's choice.

SECTION 7.2  PAYMENTS OF DEPOSITS.

        Payments or deposits made pursuant to any provisions of this Article VII
shall be a complete discharge, to the extent thereof, of all liability under the
provisions of this Plan, or otherwise, of the Administrative Committee, the
Company and this Plan, and the receipt by the person or persons receiving any
such payment, distribution or deposit shall be a complete acquittance therefor,
and there shall be no liability to see to the application of any payments,
distributions or deposits so made.

                                      26
<PAGE>
 
                                 ARTICLE VIII
                                                                               
                                 MISCELLANEOUS


SECTION 8.1  UNFUNDED BENEFIT PLAN.

        (a)  Benefits under Sections 2.4 and 2.6 of this Plan are intended to
constitute a plan that is unfunded and maintained primarily for the purpose of
providing deferred compensation in the form of additional retirement benefits to
a select group of management or highly compensated employees as defined in
Sections 201(a)(2), 301(a)(3) and 401(a)(1) of ERISA.

        (b)  Benefits under Section 2.5 of this Plan are intended to constitute
an unfunded, "excess benefit plan" within the meaning of Section 3(36) of ERISA.

SECTION 8.2  UNSECURED GENERAL CREDITOR.

        Participants and their Beneficiaries shall have no legal or equitable
rights, claims or interests in any specific assets or property of the Company,
nor shall they be the Beneficiaries of, or have any rights, claims or interests
in any life insurance policies, annuity contracts, or the proceeds therefrom
owned, or which may be acquired by, the Company (the "Policies"). Any such
Policies or other assets of the Company shall be, and remain, the general,
unpledged, unrestricted assets of the Company. The Company's obligation under
the Plan shall be merely that of an unfunded and unsecured promise of the
Company to pay money in the future.

SECTION 8.3  GRANTOR TRUST.

        Although the Company is responsible for the payment of all benefits
under the Plan, the Company may, in its discretion, contribute funds to a
grantor trust for the purpose, as it deems appropriate, of paying benefits under
this Plan. Such trust may be irrevocable, but assets of the trust shall be
subject to the claims of creditors of Lyondell Petrochemical Company. To the
extent any benefits provided under the Plan are actually paid from the trust,
the Company shall have no further obligation with respect thereto but to the
extent not so paid, such benefits shall remain the obligation of, and shall be
paid by, the Company. The Employees shall have the status of unsecured creditors
insofar as their legal claim for benefits under the Plan and the Employees shall
have no security interest in the grantor trust.

SECTION 8.4  PAYMENTS AND BENEFITS NOT ASSIGNABLE.

        Payments to and benefits under this Plan are not assignable,
transferable or subject to alienation since they are primarily for the support
and maintenance of the Participants and their joint annuitants or Beneficiaries
after retirement. Likewise, such payments shall not be subject to attachments by
creditors of, or through legal process against, the Company, the Administrative
Committee or any Participant.

                                      27
<PAGE>
 
SECTION 8.5  NO RIGHT OF EMPLOYMENT.

        The provisions of this Plan shall not give an Employee the right to be
retained in the service of the Company nor shall this Plan or any action taken
under the Plan be construed as a contract of employment.

SECTION 8.6  ADJUSTMENTS.

        At the request of the Company, the Administrative Committee may, with
respect to a Participant, adjust such Participant's benefit under this Plan or
make such other adjustments with respect to such Participant as are required to
correct administrative errors or provide uniform treatment of Participants in a
manner consistent with the intent and purpose of this Plan.

SECTION 8.7  OBLIGATION TO COMPANY.

        If a Participant becomes entitled to a distribution of benefits under
the Plan, and if at such time the Participant has outstanding any debt,
obligation, or other liability representing an amount owing to the Company, or
any benefit plan maintained by the Company, then the Company may offset such
amount owed to it or such benefit plan against the amount of benefits otherwise
distributable. Such determination shall be made by the Administrative Committee.

SECTION 8.8  PROTECTIVE PROVISIONS.

        Each Participant shall cooperate with the Company by furnishing any and
all information requested by the Company in order to facilitate the payment of
benefits hereunder, taking such physical examinations as the Company may deem
necessary, and taking such other relevant action as may be requested by the
Company. If a Participant refuses to cooperate, the Company shall have no
further obligation to the Participant under the Plan. If the Participant makes
any material misstatement of information or nondisclosure of medical history,
then no benefits will be payable hereunder to such Participant or his
Beneficiary; provided, however, that in the Company's sole discretion, benefits
             --------  -------                                                 
may be payable in an amount reduced to compensate the Company for any loss,
cost, damage or expense suffered or incurred by the Company as a result in any
way of any such action, misstatement or nondisclosure.

SECTION 8.9  GENDER, SINGULAR AND PLURAL.

        All pronouns and any variations thereof shall be deemed to refer to the
masculine, feminine, or neuter, as the identity of the person or persons may
require. As the context may require, the singular may be read as the plural and
the plural as the singular.

                                      28
<PAGE>
 
SECTION 8.10  LAW GOVERNING.

        This Plan shall be construed, regulated and administered under the laws
of the State of Texas, except to the extent that such laws are preempted by
ERISA.

SECTION 8.11  VALIDITY.

        In the event any provision of this Plan is held invalid, void, or
unenforceable, the same shall not affect, in any respect whatsoever, the
validity of any other provision of this Plan.

SECTION 8.12  NOTICE.

        Any notice or filing required or permitted to be given to the
Administrative Committee under the Plan shall be sufficient if in writing and
hand delivered, or sent by registered or certified mail, to the principal office
of the Company, directed to the attention of the Secretary of the Administrative
Committee. Such notice shall be deemed given as of the date of delivery or, if
delivery is made by mail, as of the date shown on the postmark on the receipt
for registration or certification.

SECTION 8.13  SUCCESSORS AND ASSIGNS.

        This Plan shall be binding upon the Company and its successors and
assigns.

                                      29
<PAGE>
 
                                  ARTICLE IX
                                                                               
                         AMENDMENT AND DISCONTINUANCE


SECTION 9.1  AMENDMENT OF PLAN.

        This Plan may be amended from time to time by a resolution of the
Compensation Committee of the Board of Directors of Lyondell Petrochemical
Company.

SECTION 9.2  TERMINATION.

        Lyondell Petrochemical Company intends to continue this Plan
indefinitely, but reserves the right to terminate it at any time.

SECTION 9.3  EFFECT OF AMENDMENT OR TERMINATION.

        No amendment or termination of this Plan may adversely affect the
benefit payable to any Participant receiving benefits under this Plan prior to
the effective date of the amendment or termination, or any Participant who, as
of such date, was entitled to receive a benefit under the Retirement Plans;
provided, however, that the Company may amend the Plan to eliminate any optional
- --------  -------                                                               
form of payment and any such amendment will not be deemed to have adversely
affected the benefit entitlement of any eligible Participant.

                                      30

<PAGE>
 
                                                                 EXHIBIT 10.3(A)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

                    SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN



Lyondell Petrochemical Company hereby amends, effective August 1, 1997, the
Lyondell Petrochemical Company Supplementary Executive Retirement Plan, as
follows:

Section 5.1, EVENTS CONSTITUTING A "CHANGE IN CONTROL", is revised in its
entirety to read as follows:

SECTION 5.1.  Events Constituting a "Change in Control"
              -----------------------------------------


     For purposes of this Plan, a "Change in Control" will be deemed to have
occurred as of the date that one or more of the following occurs:


(a)  Individuals who, as of the date hereof, constitute the entire Board of
Directors of the Company ("Incumbent Directors") cease for any reason to
constitute at least a majority of the Board; provided, however, that any
                                             --------  -------          
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by the Company's shareholders, was approved by a vote of
at least a majority of the then Incumbent Directors shall be considered as
though such individual was an Incumbent Director, but excluding, for this
purpose any such individual whose initial assumption of office occurs as a
result of either an actual or threatened election contest, as such terms are
used in Rule 14a-11 under the Exchange Act or other actual or threatened
solicitation of proxies or consents by or on behalf of any Person (as defined
below) other than the Board; provided, further, that in the event ARCO at any 
                             --------  -------
time determines to achieve minority representation on the Company's Board of
Directors approximately equal to its then ownership percentage of the Company's
common stock, its implementation of such determination through the election of
ARCO employees as directors of the Company shall not be deemed to be a Change in
Control and such ARCO employees shall constitute Incumbent Directors;

(b)  The stockholders of the Company shall approve (A) any merger, consolidation
or recapitalization of the Company (or, if the capital stock of the Company is
affected, any subsidiary of the Company), or any sale, lease, or other transfer
(in one
<PAGE>
 
transaction or a series of transactions contemplated or arranged by any party as
a single plan) of all or substantially all of the assets of the Company (each of
the foregoing being an "Acquisition Transaction") where (1) the shareholders of
the Company immediately prior to such Acquisition Transaction would not
immediately after such Acquisition Transaction beneficially own, directly or
indirectly, shares or other ownership interests representing in the aggregate
eighty percent (80%) or more of (a) the then outstanding common stock or other
equity interests of the corporation or other entity surviving or resulting from
such merger, consolidation or recapitalization or acquiring such assets of the
Company, as the case may be (the "Surviving Entity") (or of its ultimate parent
corporation or other entity, if any), and (b) the Combined Voting Power of the
then outstanding Voting Securities of the Surviving Entity (or of its ultimate
parent corporation or other entity, if any) or (2) the Incumbent Directors at
the time of the initial approval of such Acquisition Transaction would not
immediately after such Acquisition Transaction constitute a majority of the
Board of Directors, or similar managing group, of the Surviving Entity (or of
its ultimate parent corporation or other entity, if any), or (B) any plan or
proposal for the liquidation or dissolution of the Company;

(c)  Any Person except for ARCO shall be or become the beneficial owner (as
defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
indirectly, of securities of the Company representing in the aggregate more than
twenty percent (20%) of either (A) the then outstanding shares of common stock
of the Company ("Common Shares") or (B) the Combined Voting Power of all then
outstanding Voting Securities of the Company; provided, however, that 
                                              --------  -------
notwithstanding the foregoing, a "Change of Control" shall not be deemed to have
occurred for purposes of this subsection (c):

     (1)  Solely as a result of an acquisition of securities by the Company
     which, by reducing the number of Common Shares or other Voting Securities
     outstanding, increases (a) the proportionate number of Common Shares
     beneficially owned by any Person to more than twenty percent (20%) of the
     Common Shares then outstanding, or (b) the proportionate voting power
     represented by the Voting Securities beneficially owned by any Person to
     more than twenty percent (20%) of the Combined Voting Power of all then
     outstanding Voting Securities; or

     (2)  Solely as a result of an acquisition of securities directly from the
     Company except for any conversion of a security that was not acquired
     directly from the Company.   Provided, further, that if any Person referred
                                  --------  -------                             
     to in paragraph (1) or (2) of this subsection (C) shall thereafter become
     the beneficial owner of any additional Common Shares or other Voting
     Securities of the Company (other than pursuant to a stock split, stock
     dividend or similar transaction), then a "Change of Control" shall be
     deemed to have occurred for purposes of this subsection (c); or

(d)  ARCO shall become the owner, directly or indirectly, of securities of the
Company representing in the aggregate more than fifty percent (50%) of either
(i) the

                                       2
<PAGE>
 
then outstanding Common Shares or (ii) the Combined Voting Power of all then
outstanding Voting Securities of the Company except as the result of an
acquisition of securities by the Company which, by reducing the number of Common
Shares or other Voting Securities outstanding, increases (x) the proportionate
number of Common Shares beneficially owned by ARCO to more than fifty percent
(50%) of the Common Shares then outstanding, or (y) the proportionate voting
power represented by the Voting Securities beneficially owned by ARCO to more
than fifty percent (50%) of the Combined Voting Power of all then outstanding
Voting Securities; provided, however, that if thereafter ARCO becomes the
                   --------  -------                                     
beneficial owner of any additional Common Shares or other Voting Securities of
the Company (other than pursuant to a stock split, stock dividend or similar
transaction) the exception provided above shall no longer apply; provided, 
                                                                 --------
further, that for purposes of this subsection (d), neither record ownership of 
- -------                                                          
common stock of the Company by the Trustee for ARCO's 401(a) qualified plans nor
beneficial ownership of common stock of the Company by any of ARCO's directors
for their personal account shall be deemed to constitute "indirect" ownership of
common stock of the Company by ARCO; provided, further, that notwithstanding 
                                     --------  -------
any contrary provision of this Agreement, no Change in Control shall be deemed
to have occurred pursuant to this subsection (iv) if as a result of an
inadvertent act ARCO becomes the owner, directly or indirectly, of additional
Common Shares or Voting Securities and such securities are sold or otherwise
disposed of by ARCO within 30 days after ARCO discovers, or is notified by the
Company as to, the potential Change of Control resulting from such ownership, so
that, as a result of such subsequent sale or other disposition by ARCO, no
Change in Control would otherwise be deemed to have occurred pursuant to the
terms (excluding this proviso) of this subsection (d).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
to have occurred as a result solely of (i) the registration by ARCO of the
Exchangeable Notes pursuant to the Registration Statement, (ii) the issuance and
sale by ARCO of the Exchangeable Notes to the underwriters in accordance with
the Registration Statement, (iii) prior to the maturity of the Exchangeable
Notes, purchases and sales of the Exchangeable Notes, or (iv) a transaction in
which assets of the Company are contributed to an entity pursuant to the
creation of a partnership under the terms of certain agreements authorized by
the Incumbent Directors on July 25, 1997.

(e)  For purposes of this Section 5.1:

          (i)    "Affiliate" shall mean, as to a specified Person, another
     Person that directly, or indirectly through one or more intermediaries,
     controls or is controlled by, or is under common control with, the
     specified Person, within the meaning of such terms as used in Rule 405
     under the Securities Act of 1933, as amended, or any successor rule.

          (ii)   "ARCO" shall mean Atlantic Richfield Company and any of its
     Affiliates, excluding the Company.

                                       3
<PAGE>
 
          (iii)  "Combined Voting Power" shall mean the aggregate votes entitled
     to be cast generally in the election of the Board of Directors, or similar
     managing group, of a corporation or other entity by holders of then
     outstanding Voting Securities of such corporation or other entity.

          (iv)   "Exchangeable Notes" shall mean the debt securities
     exchangeable upon maturity, at ARCO's option, into shares of the Company's
     common stock or cash, as such debt securities are described in the
     Registration Statement.

          (v)    "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a
     Limited Liability Company organized under the laws of the State of Texas.

          (vi)   "Person" shall mean any individual, entity (including, without
     limitation, any corporation, partnership, trust, joint venture, association
     or governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2)
     of the Exchange Act and the rules and regulations thereunder); provided,
                                                                    -------- 
     however, that Person shall not include the Company or LCR, any of their
     -------                                                                
     subsidiaries, any employee benefit plan of the Company or LCR or any of
     their majority-owned subsidiaries or any entity organized, appointed or
     established by the Company, LCR or such subsidiaries for or pursuant to the
     terms of any such plan.

          (vii)  "Registration Statement" shall mean ARCO's registration
     statement on Form S-3 (Registration No. 33-53481) with respect to the
     Exchangeable Notes.

          (viii) "Voting Securities" shall mean all securities of a corporation
     or other entity having the right under ordinary circumstances to vote in an
     election of the Board of Directors, or similar managing group, of such
     corporation or other entity.



IN WITNESS WHEREOF, the undersigned, being duly authorized on behalf of the
Company, has executed this instrument on this __________ day of August, 1997.



ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY



BY: ________________________            BY:______________________________
    Assistant Secretary                        Richard W. Park
                                               Vice President, Human Resources

                                       4

<PAGE>
 
                                                                    EXHIBIT 10.5





LYONDELL PETROCHEMICAL COMPANY
- --------------------------------------------------------------------------------
EXECUTIVE DEFERRAL PLAN


EFFECTIVE JANUARY 1, 1998
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                            EXECUTIVE DEFERRAL PLAN

                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>

                                                                            Page
<S>                                                                         <C>
ARTICLE I....................................................................  1
Section 1.1     Purpose and Intent of Plan...................................  1
Section 1.2     Effective Date of Plan.......................................  1
Section 1.3     Definitions..................................................  1

ARTICLE II...................................................................  5
Section 2.1     Eligibility and Participation................................  5
       (a)      Eligibility..................................................  5
       (b)      Participation................................................  5
Section 2.2     Forms of Deferral............................................  5
       (a)      Basic Deferral...............................................  5
       (b)      Savings Deferral.............................................  5
Section 2.3     Deferral Elections...........................................  5
Section 2.4     Limitation on Deferral.......................................  6
Section 2.5     Termination of Employment....................................  6
Section 2.6     Transfers....................................................  6
Section 2.7     Modification of Deferral Elections...........................  6
       (a)      Financial Hardship...........................................  6
       (b)      Accelerated Deferral.........................................  7

ARTICLE III..................................................................  8
Section 3.1     Accounts.....................................................  8
Section 3.2     Deferral Compensation........................................  8
Section 3.3     Interest Rate................................................  8
       (a)      Interest Rate During Participant's Lifetime..................  8
       (b)      Interest Rate After Participant's Death......................  8
Section 3.4     Determination of Accounts....................................  9
Section 3.5     Vesting of Accounts..........................................  9
Section 3.6     Statement of Accounts........................................  9

ARTICLE IV................................................................... 10
Section 4.1     Basic Plan Benefit........................................... 10
Section 4.2     Form and Time of Retirement Distribution..................... 10
       (a)      Time of Retirement Distributions............................. 10
       (b)      Form of Retirement Distributions............................. 10
Section 4.3     Form of Distribution upon Termination of Employment.......... 11
Section 4.4     Survivor Benefits............................................ 11
</TABLE>
<PAGE>
 
<TABLE>
<S>                                                                          <C>

Section 4.5     Early Distributions.......................................... 14
       (a)      Timing of Election........................................... 14
       (b)      Amount of withdrawal......................................... 14
       (c)      Timing and Form of Early Distribution........................ 14
Section 4.6     Unscheduled Distributions.................................... 14
       (a)      Distribution on Account of Financial Hardship................ 14
       (b)      Other Unscheduled Distributions.............................. 14
       (c)      Review of the Request for Unscheduled Distributions.......... 15
Section 4.7     Disability................................................... 15
Section 4.8     Termination of Employment Due to Special Circumstances....... 15
Section 4.9     Valuation and Settlement..................................... 16
Section 4.10    Small Benefit................................................ 16
Section 4.11    Benefits in the Event of a Change in Control................. 16
Section 4.12    Definitions.................................................. 17
                                                                                
ARTICLE V.................................................................... 20
Section 5.1     Designation of Beneficiary................................... 20
Section 5.2     Failure to Designate Beneficiary............................. 20
                                                                                
ARTICLE VI................................................................... 21
Section 6.1     Administrative Committee..................................... 21
Section 6.2     Rules of Conduct; Administrative Provisions.................. 21
Section 6.3     Legal, Accounting, Clerical and Other Services............... 21
Section 6.4     Interpretation of Provisions................................. 21
Section 6.5     Records of Administration.................................... 21
Section 6.6     Denial of Claim.............................................. 22
Section 6.7     Liability of Committee....................................... 22
                                                                                
ARTICLE VII.................................................................. 23
Section 7.1     Amendment of Plan............................................ 23
Section 7.2     Termination.................................................. 23
Section 7.3     Effect of Amendment or Termination........................... 23
                                                                                
ARTICLE VIII................................................................. 24
Section 8.1     Unfunded Benefit Plan........................................ 24
Section 8.2     Unsecured General Creditor................................... 24
Section 8.3     Grantor Trust................................................ 24
Section 8.4     Payments and Benefits Not Assignable......................... 24
Section 8.5     No Right of Employment....................................... 25
Section 8.6     Adjustments.................................................. 25
Section 8.7     Obligation to Company........................................ 25
Section 8.8     Protective Provisions........................................ 25
Section 8.9     Gender, Singular and Plural.................................. 26
Section 8.10    Law Governing................................................ 26
</TABLE>
                                                                              ii
<PAGE>
 
<TABLE> 
<S>                                                                         <C> 
Section 8.11    Notice...................................................... 26
Section 8.12    Successors and Assigns...................................... 26
Section 8.13    Provisions for Incapacity................................... 26
</TABLE>

                                                                            iii
<PAGE>
 
                                   ARTICLE I

                               GENERAL PROVISION


SECTION 1.1  PURPOSE AND INTENT OF PLAN.

     This Plan is intended to provide the opportunity for eligible Employees to
accumulate supplemental funds through the deferral of portions of their regular
salary, Awards and Executive Supplementary Savings Plan benefits for retirement
or special needs prior to retirement.

     This Plan is an amendment and restatement of the deferral provisions of the
Lyondell Petrochemical Company Executive Deferral Plan and Lyondell
Petrochemical Company Senior Manager Deferral Plan.

SECTION 1.2  EFFECTIVE DATE OF PLAN.

     This amended and restated Plan document shall be generally effective as of
January 1, 1998 and shall apply to those Employees who are employed by the
Company on or after January 1, 1998, except to the extent that certain
provisions hereof specify that they are effective as of a different date.

SECTION 1.3  DEFINITIONS.

     ACCOUNT means a separate bookkeeping account maintained by the Company for
each Employee and which measures and determines the amounts to be paid to the
Employee under the Plan. Effective October 1, 1996, separate subaccounts for
previous deferrals of Salary, Awards or ESSP Benefits were consolidated into a
single account balance. Accounts also include any Transferred Accounts that were
assumed as obligations of this Plan as of October 1, 1990.

     ADMINISTRATIVE COMMITTEE means the Benefits Administrative Committee of the
Company.

     AWARDS means immediate cash awards made under the Lyondell Petrochemical
Company annual incentive compensation plans for executives and senior managers
or awards under any other plan that the Board of Directors of Lyondell
Petrochemical Company, or its Compensation Committee, has authorized the Company
to adopt and has further authorized awards thereunder to be treated as Awards
under this Plan.

     BENEFICIARY means a person who is entitled to receive an Employee's
interest under this Plan in the event of the Employee's death.

                                       1
<PAGE>
 
     CHANGE IN CONTROL means a change in the control of Lyondell Petrochemical
Company as defined in Section 4.12 of the Plan.

     CODE means the Internal Revenue Code of 1986, as amended, including any
successor provisions thereof and any regulations or other guidance promulgated
pursuant thereto by applicable governmental agencies.

     COMPANY means Lyondell Petrochemical Company, a Delaware corporation, or
its successor.

     DEFERRAL ELECTION means an election made by an Employee to defer Salary,
Awards, and/or ESSP Benefits pursuant to Article II, for which the Employee has
submitted a Participation Agreement to the Company.

     DEFERRAL PERIOD means a maximum number of years, established by the
Administrative Committee in advance of a particular Deferral Election, over
which the Employee elects to defer Salary, Awards and/or ESSP Benefits. A new
Deferral Period shall normally start each January 1, except that an Employee who
is immediately eligible upon his commencement of employment or who otherwise
attains eligibility following the Effective Date, shall have his Deferral Period
commence 30 days following the Employee's first day of employment or attainment
of eligibility, as applicable.

     DEFERRED COMPENSATION means the amount of Salary, Awards and/or ESSP
Benefits that a Participant elects to defer pursuant to a Deferral Election.

     DISABILITY means the disability as determined under the provisions of the
Company's Executive Long-Term Disability Plan.

     EARLY DISTRIBUTION means a distribution prior to Termination of Employment
pursuant to Section 4.5.

     EFFECTIVE DATE means January 1, 1998.

     EMPLOYEE means an individual who is a regular salaried employee of the
Company on or after January 1, 1998.

     ERISA means the Employee Retirement Income Security Act of 1974, as
amended, including any successor provisions thereof, and any regulations or
other guidance promulgated pursuant thereto by applicable governmental agencies.

                                                                               2
<PAGE>
 
     ESSP BENEFITS means the benefits under the Company's Executive
Supplementary Savings Plan.

     FINANCIAL HARDSHIP means a condition of financial difficulty, determined by
the Administrative Committee, upon advice of counsel, based on written
information supplied by the Employee in accordance with such standards
established by the Administrative Committee from time to time, which condition
is sufficient, in counsel's judgment, to justify a change in payment election
under the Plan without causing receipt of taxable income by any other Plan
Participant before the Participant actually receives his benefit.

     INTEREST RATE means the interest rate announced by the Company in advance
of the election period for a Plan Year which shall be the interest rate applied
to that Plan year.

     PARTICIPANT means any Employee who is participating in this Plan as
provided in Article II, and any former Employee who has not received the entire
benefit to which he is entitled under this Plan.

     PARTICIPATION AGREEMENT means the Deferral Election submitted by a
Participant to the Company prior to the beginning of the Deferral Period.

     PLAN means this Executive Deferral Plan.

     PLAN YEAR means each calendar year beginning on January 1 and ending on
December 31.

     RETIREMENT DISTRIBUTION means a distribution due to Termination of
Employment with a right to an immediate allowance under a retirement plan
maintained by the Company.

     SALARY means the Employee's regular, biweekly salary, excluding Awards and
any other special or additional compensatory payments made by the Company.

     SUBSIDIARIES OR AFFILIATES means:

     (a)  All corporations, that are members of a controlled group of
corporations within the meaning of Section 1563(a) of the Code (determined
without regard to Section 1563(a)(4) and Section 1563(e)(3)(C) of said Code) and
of which the Company is then a member, and

     (b)  All trades or businesses, whether or not incorporated, that, under the
regulations prescribed by the Secretary of the Treasury pursuant to Section
210(d) of ERISA, are then under common control with the Company.

     SURVIVOR BENEFIT means the benefit provided by Section 4.4 in the event of
the Participant's death.

                                                                               3
<PAGE>
 
     TERMINATION OF EMPLOYMENT means the termination of an Employee's employment
with Lyondell Petrochemical Company, LYONDELL-CITGO Refining Company Ltd. and
Equistar Chemicals L. P. or any subsidiary or affiliate of any such company.  A
transfer to any such company, to which a Participant voluntarily consents, shall
not be a Termination of Employment for purposes of this Plan.

     TRANSFERRED ACCOUNT means the portion of any Participant's Account that
reflect amounts of deferrals made by the Participant, plus any credited
interest, prior to October 1, 1990 under the Company's Annual Incentive Plan and
Executive Supplementary Savings Plan.

     VALUATION DATE means the last day of each month, or such other dates as the
Administrative Committee may determine in its discretion, which may be either
more or less frequent, for the valuation of Participants' Accounts.

     401(K) AND SAVINGS PLAN means the Company's 401(k) and Savings Plan.

                                                                               4
<PAGE>
 
                                  ARTICLE II

                    PARTICIPATION AND DEFERRAL COMMITMENTS


SECTION 2.1  ELIGIBILITY AND PARTICIPATION.

     (a)  ELIGIBILITY.  Eligibility to make a Deferral Election shall be limited
to Employees (1) who are eligible to receive an Award (2) who are Participants
in the Executive Supplementary Savings Plan or (3) who have been designated as
eligible by a specific resolution of the Administrative Committee upon
recommendation of the Senior Vice President and Chief Administrative Officer of
the Company.

     (b)  PARTICIPATION.  An eligible Employee may elect to participate in the
Plan by submitting a Participation Agreement in accordance with rules, including
the time and form of submission, established by the Administrative Committee.

SECTION 2.2  FORMS OF DEFERRAL.

     (a)  BASIC DEFERRAL.  A Participant may elect to defer Salary, Awards
and/or ESSP Benefits in a Participation Agreement subject to any limitations,
conditions or restrictions, such as minimum or maximum amounts that may be
deferred, as the Administrative Committee prescribes in advance of the Deferral
Period.

     (b)  SAVINGS DEFERRAL.  Any amount of Salary that the Participant elected
to contribute to the 401(k) and Savings Plan during each Deferral period that
was not permitted due to legal restrictions precluding such contributions and
deferrals to the 401(k) and Savings Plan, other than the limitation on the
amount of deferrals under Section 402(g) of the Code, shall be deferred under
this Plan to the extent that such contributions would have received a matching
Company contribution under the 401(k) and Savings Plan.  The Company will
contribute an additional amount for amounts deferred during a Deferral Period
under this Subsection (b) based upon the matching Company contribution formula
then in effect under the 401(k) and Savings Plan.

SECTION 2.3  DEFERRAL ELECTIONS.

     Prior to each Deferral Period, at a time and on a form prescribed by the
Administrative Committee, each Employee may execute an election form to defer
Salary, Awards, and/or ESSP Benefits.  This Deferral Election shall be
irrevocable unless modifications are authorized pursuant to Section 2.7.

                                                                               5
<PAGE>
 
SECTION 2.4  LIMITATION ON DEFERRAL

     Except as permitted for accelerated deferral in Section 2.7(b), Deferral
Elections shall be subject to the following limitations:

     (a)  A Participant may not defer more than 50 percent of his Salary.

     (b)  The minimum amount that may be deferred for the Deferral Period
relating to a Deferral Election shall be established by the Administrative
Committee in advance of the Deferral Period.

SECTION 2.5  TERMINATION OF EMPLOYMENT.

  A Participant's Deferral Elections shall terminate upon the Participant's
Termination of Employment; provided, however, that any Deferral Election
                           --------  -------                            
relating to Salary, Awards and/or ESSP Benefits granted after Termination of
Employment shall remain binding.

SECTION 2.6  TRANSFERS.

     A Participant's Deferral Elections shall be irrevocable regardless of a
transfer of employment among Lyondell Petrochemical Company, LYONDELL-CITGO
Refining Company Ltd., Equistar Chemicals L. P. or any subsidiary or affiliate
of any such company.  In the case of such a transfer, other than a transfer to
Equistar Chemicals L. P. as a result of the formation of Equistar Chemicals, L.
P., the Participant's Deferral Election shall apply to Awards, Salary or ESSP
Benefits granted by the transferee company and the applicable Plan of the
transferee company shall assume responsibility for the remaining period, if any,
of any Deferral Election that the Participant made under the transferor
company's plan.

SECTION 2.7  MODIFICATION OF DEFERRAL ELECTIONS.

     Deferral Elections shall be irrevocable except as follows:

     (a)  FINANCIAL HARDSHIP.  The Administrative Committee may permit a
Participant to either reduce the amount elected under a prior Deferral Election,
or waive the remaining deferrals under a prior Deferral Election, upon finding
that the Participant has suffered a Financial Hardship.

                                                                               6
<PAGE>
 
     (b)  ACCELERATED DEFERRAL.  At the Administrative Committee's discretion,
prior to the beginning of any Plan Year in any Deferral Period for which two or
more Plan Years remain, a Participant may elect to accelerate the amount of
previously elected Deferred Compensation for any of the remaining Plan Years in
that Deferral Period on a form prescribed by the Administrative Committee;
provided, however, that any acceleration in Deferred Compensation for remaining
- --------  -------                                                              
Plan Years in the Deferral period shall not increase, for any single Plan Year,
the total Salary deferrals above 50 percent of Salary, the total deferred Awards
above 100 percent of an Award or the total deferred ESSP Benefits above 100
percent of the ESSP Benefits during that Plan Year.

                                                                               7
<PAGE>
 
                                  ARTICLE III

                        DEFERRED COMPENSATION ACCOUNTS


SECTION 3.1  ACCOUNTS.

     For record-keeping purposes only, Accounts shall be maintained for each
Participant.

SECTION 3.2  DEFERRED COMPENSATION.

     A Participant's Deferred Compensation shall be credited to the
Participant's Account as of the date when the corresponding non-deferred portion
of the compensation is paid or would have been paid but for the Deferral
Election. The Company shall have the right to withhold from Salary (or otherwise
to cause the Employee or the executor or administrator of his estate, or his
Beneficiary) to make payment of any federal, state, local and/or foreign taxes
required to be withheld with respect to any Deferred Compensation.

SECTION 3.3  INTEREST RATE.

     The Accounts shall be credited with interest based on the rates specified
below. Interest shall be credited monthly as of each Valuation Date from the
dates when deferred amounts are credited to Accounts, based on the balance of
each Account.

     (a)  INTEREST RATE DURING PARTICIPANT'S LIFETIME.  During a Participant's
lifetime, the Participant's Account will be credited with interest on a monthly
basis during each Plan Year at the Interest Rate previously announced by the
Company to apply during the Plan Year.  The monthly Interest Rate during the
1998 Plan Year shall be based on the previous monthly average of the Salomon
Brothers Corporate BB Bond Yield.

     (b)  INTEREST RATE AFTER PARTICIPANT'S DEATH.  Except with respect to
payments made pursuant to Article IV, Section 4.4(a)(2)(i) following a
Participant's death, the Participant's Account will be credited with interest on
a monthly basis during each Plan Year at the Interest Rate previously announced
by the Company to apply during the Plan Year.

SECTION 3.4  DETERMINATION OF ACCOUNTS.

     A Participant's Account as of each Valuation Date shall consist of the
balance of the Participant's Account as of the immediately preceding Valuation
Date, plus the amount of the Participant's Deferred Compensation since Valuation
Date, plus interest credited to the Account, and minus any distributions or
reductions made from the Account since the immediately preceding Valuation Date.

                                                                               8
<PAGE>
 
SECTION 3.5  VESTING OF ACCOUNTS.

     Each Participant shall be 100 percent vested at all times in the amounts
credited to the Participant's Account.

SECTION 3.6  STATEMENT OF ACCOUNTS.

     The Company shall provide each Participant with periodic statements setting
forth the balance of the Participant's Account.

                                                                               9
<PAGE>
 
                                  ARTICLE IV

                                 PLAN BENEFITS


SECTION 4.1  BASIC PLAN BENEFIT.

     If a Participant has a Termination of Employment for any reason, the
Company shall pay a Plan benefit equal to the Participant's Account, as
determined below:

     (a)  Accounts of Participants shall be credited with the interest rate
previously determined under Section 3.3(a) and communicated in advance of each
deferral Period, to apply each Plan Year that the Account has been maintained.

     (b)  Except as provided in Section 4.11, the Interest Rates provided under
Section 4.1(a) shall be payable until the Participant's Account is distributed
in full.

SECTION 4.2  FORM AND TIME OF RETIREMENT DISTRIBUTION.

     (a)  TIME OF RETIREMENT DISTRIBUTIONS. Retirement Distributions shall be
paid at the time and in the form of benefit elected by the Participant. If a
Participant is an Employee, the Participant may change a distribution election
once each year until the year in which the Participant attains age 53. The
change must be made during a period established by the Administrative Committee
which precedes a Deferral Period and is irrevocable until the next period
established by the Administrative Committee.

     The Participant's distribution election shall be irrevocable as of the year
in which a Participant attains age 53, except that a Participant may request, in
writing, that the Administrative Committee allow a change in distribution
election prior to retirement or commencement of benefits, or in the case of
installment payments, following commencement of payments, (i) without any
reduction in, or imposition of any penalty on, the Participant's Account, if the
Administrative Committee determines that the Participant has experienced a
Financial Hardship justifying the request for a change of election, or (ii) if
the Administrative Committee, in its sole discretion, determines that it is
appropriate to grant the Participant's request. Absent the Participant's
election of the form and/or commencement date of the Retirement Distribution,
payment will be made in a lump sum immediately following the Participant's date
of retirement from the Company.

     (b)  FORM OF RETIREMENT DISTRIBUTIONS. A Participant may elect one or more
of the following forms and commencement dates for all or portions of his
Deferral Account:

                                                                              10
<PAGE>
 
          (1)  LUMP SUM. A single payment of all or a percentage of, or of a
specific dollar amount of, the Participant's Deferral Account, payable at
retirement.

          (2)  INSTALLMENT PAYMENTS. Monthly installment payments in
substantially equal payments of principal and interest over periods prescribed
and communicated by the Administrative Committee in advance of the applicable
Deferral period. The amount of each of the monthly installments shall be
redetermined effective as of January 1 of each year based on the remaining
Account balance and the remaining number of installment payments.

          (3)  DEFERRED PAYMENTS. A lump sum or installment payments or
combination thereof, commencing subsequent to retirement at one of the optional
deferral times prescribed and communicated by the Administrative Committee in
advance of the applicable Deferral Period.

SECTION 4.3  FORM OF DISTRIBUTION UPON TERMINATION OF EMPLOYMENT.

     Except as provided in Sections 4.8 and 4.11, termination benefits payable
upon a Participant's Termination of Employment other than due to retirement or
death shall be paid in a lump sum following Termination of Employment; provided,
                                                                       -------- 
however, that the Administrative Committee may, in its sole discretion, pay such
- -------                                                                         
termination benefits in monthly installments over a 3-year period.


SECTION 4.4  SURVIVOR BENEFITS.

     (A)  AMOUNT AND FORM OF BENEFIT ON AND AFTER JULY 1, 1993:

          (1)  DEATH AFTER AGE 65. If the Participant dies on or after attaining
age 65, the amount of the Survivor Benefit shall be equal to the Participant's
Account balance, increased by the applicable Interest Rate on the unpaid Account
balance during the period in which Survivor Benefit payments are being made to
the Participant's Beneficiary, and payable in the form elected by the
Participant.

          (2)  DEATH PRIOR TO TERMINATION OF EMPLOYMENT AND PRIOR TO AGE 65.

               (i)  Benefit Determination. If a Participant dies prior to
attaining age 65 and prior to Termination of Employment, the Survivor Benefit
payable with respect to such Participant shall be the greater of the values
determined under (A) or (B) immediately below:

                                                                              11
<PAGE>
 
               (A)  The net present value of a stream of annual payments which
equals 40 percent of the Participant's Account, and which are payable on the
date of the Participant's death and on each anniversary of such date until the
date on which the Participant would have attained age 65. For purposes of this
calculation (I) the applicable discount rate shall be determined by the
Administrative Committee, in its sole discretion, and (II) Deferral Elections
that have not been completed prior to the Participant's death shall be
determined in accordance with the provisions of Section 4.4(a)(2)(i)(c) below;
or

               (B)  The value of the Participant's Account balance at his date
of death.

               (C)  For purposes of calculating the deferred amount where a
Participant has died before he completes his Deferral Elections, the
Participant's Salary (for purposes of determining the amount deferred with
respect to either Salary or ESSP Benefits) and Awards for relevant years or
other time periods ending after this death shall be deemed to be as follows:

                    (I)  Salary for each year or time period shall be the
     Participant's annual base Salary in effect on the date of his death,
     increased for each year after his death by the escalation factor for such
     year, determined in the sole discretion of the Administrative Committee;
     and

                    (II) Awards for each such year shall be the amount that is
     the highest annual average of the Participant's Awards paid in any 3
     consecutive year period during the last ten years during which the
     Participant received Awards from the Company or, for years prior to the
     Effective Date, from a Subsidiary or Affiliate (or if fewer than ten, the
     total number of years for which the Participant received Awards).

               (ii) Amount and Form of Payment.

                    (A)  The annual Survivor Benefit payable with respect to
Section 4.4(a)(2)(i)(A) shall be equal to 40 percent of the value of the
Account, as determined in accordance with Section 4.4(a)(2)(i)(A) and, to the
extent applicable, with Section 4.4(a)(2)(i)(C). One-twelfth of the annual
Survivor Benefit shall be paid monthly from the Participant's date of death
until the end of the month in which the Participant would have attained age 65.

                                                                              12
<PAGE>
 
                    (B)  The Survivor Benefit payable with respect to Section
4.4(a)(2)(i)(B) shall be the value of the Participant's Account balance at his
date of death, increased by the applicable Interest Rate on the unpaid Account
balance during the period in which Survivor Benefit payments are being made to
the Participant's Beneficiary, and shall be paid in monthly installments over
the greater of:

                         (I)  the period described in Section 4.4(a)(2)(ii)(A);
     or

                         (II) the period over which the Participant had elected
     to have installment payments made after his retirement.

                    (C)  Notwithstanding any other provision of this Plan, if
the Survivor Benefit payable is the amount determined under Section
4.4(a)(2)(ii)(A), and if the Participant completed (or, pursuant to Section
4.4(a)(2)(i)(C), is deemed to have completed) a portion of a Deferral Election
while an employee at LYONDELL-CITGO Refining Company Ltd. and a portion of such
Deferral Election while a Participant in this Plan, then the annual amount of
the Survivor Benefit determined pursuant to Section 4.4(a)(2)(ii)(A) shall be
equal to the product of (I) the amount of the Survivor Benefit determined
pursuant to Section 4.4(a)(2)(ii)(A), multiplied by (II) a fraction, the
numerator of which is equal to the portion of the Deferral Elections that the
Participant completed (or, pursuant to Section 4.4(a)(2)(i)(C), is deemed to
have completed) under this Plan and the denominator of which is equal to the sum
of the Deferral Election that the Participant completed (or, pursuant to Section
4.4(a)(2)(i)(C) is deemed to have completed) under this Plan and under the
LYONDELL-CITGO Refining Company Ltd. Executive Deferral Plan. An example of the
determination of the Survivor Benefit and the proration of that Benefit between
the Company and LYONDELL-CITGO Refining Company Ltd. is attached hereto as
Appendix A.

     (B)  DEATH AFTER TERMINATION OF EMPLOYMENT AND PRIOR TO AGE 65. If the
Participant dies after Termination of Employment and prior to age 65, the
Participant's Account balance shall be paid by continuation of the form of
benefit that was payable to the Participant for the remaining payments that
would have been made to the Participant if the Participant had lived, increased
by the applicable Interest Rate credited on unpaid Account balances of deceased
Participants during each year of the payment period to the Beneficiary.

     (C)  DEATH FOLLOWING CHANGE IN CONTROL. If a Participant is entitled to a
payment under Section 4.11 and dies prior to receiving his entire Account, the
balance of the Participant's Account shall be paid to Participant's Beneficiary
in a lump sum or on an installment basis, according the Participant's election
of form of payment on Change in Control.

                                                                              
                                                                              13
<PAGE>
 
SECTION 4.5  EARLY DISTRIBUTIONS.

A Participant may elect to receive an Early Distribution from his Account
subject to the following restrictions:

     (A)  TIMING OF ELECTION. The election to take an Early Distribution from an
Account for a particular Deferral Election must be made at the same time the
Participant makes the particular Deferral Election.

     (B)  AMOUNT OF WITHDRAWAL. The amount which a Participant can elect to
receive as an Early Distribution with respect to an Account shall be such
portions of the Participant's Account balance for the amounts deferred under a
particular Deferral Election, as prescribed by the Administrative Committee in
advance of the Deferral Period. If a previously elected amount exceeds the
Account balance when an Early Distribution is to be made, only the Account
balance will be paid.

     (C)  TIMING AND FORM OF EARLY DISTRIBUTION. The Early Distribution shall
commence at a time prescribed by the Administrative Committee and in the form
elected by the Participant on the Participation Agreement at the time of the
Deferral Election; provided, however, that if the Participant terminates
                   --------  -------                                    
employment without a right to commence a retirement allowance under the
Retirement Plan, the Early Distribution election will be canceled and
distribution will be made pursuant to Section 4.3; and provided, further, that
                                                       --------  -------      
if the Participant terminates employment with a right to commence a retirement
allowance, the Early Distribution election will be canceled and distribution
will be made pursuant to Section 4.2.

     (D)  Amounts paid to a Participant pursuant to this section shall be
treated as distributions from the Participant's Account.

SECTION 4.6  UNSCHEDULED DISTRIBUTIONS.

     (A)  DISTRIBUTIONS ON ACCOUNT OF FINANCIAL HARDSHIP. Upon a finding that a
Participant has suffered a Financial Hardship, following the Participant's
written application, the Administrative Committee shall make a distribution of
all or a portion of the Participant's Account, consistent with the finding of
Financial Hardship but not to exceed the amount of the Participant's request,
without any reduction in, or imposition of any penalty on, the Participant's
Account. The distribution shall be paid in a lump sum as soon as
administratively practical following the finding of Financial Hardship.

     (B)  OTHER UNSCHEDULED DISTRIBUTIONS. A Participant, by a written
application to the Administrative Committee, may apply for a distribution of all
or part of his/her Account, without regard to any condition of Financial
Hardship. Any distribution so requested shall be

                                                                              14
<PAGE>
 
made as soon as practical following the Participant's application and shall be
subject to whatever penalty, in the form of a forfeiture of a percentage of the
amount requested and/or a suspension of participation, as may be determined by
the Administrative Committee, upon the advice of Counsel for the Plan, to be
necessary to preclude the constructive receipt of taxable income by any
Participant in the Plan.

     (c)  REVIEW OF THE REQUEST FOR UNSCHEDULED DISTRIBUTIONS.  Counsel for the
Plan, on an ongoing basis, shall review legal and tax developments to assure
continuous compliance with the relevant authorities governing plan design to
prevent constructive receipt of taxable income by any Participant, and shall
advise the Administrative Committee in writing in advance of any change in its
most recent written advice on the penalty that is to be imposed with respect to
unscheduled distributions.

     The Company shall notify Participants in writing of the provisions of this
Section 4.6 and of the specific, currently effective penalty as described under
Section 4.6(b), and shall update this written notification periodically and in
advance of any subsequent change of which it is notified under Section 4.6(c),
unless in the opinion of the Company it is administratively impractical to do
so, in which case such notification shall be provided no later than30 days
following the effective date of the change.


SECTION 4.7  DISABILITY.

     If a Participant suffers a Disability under the provisions of the Company's
Executive or regular Long-Term Disability Plan, the Participant's Deferral
Elections will cease except for any awards that may be payable thereafter.
Distribution of the Participant's Account will not be made due to the
Disability.  The Participant's Account will be distributed in accordance with
the method that the Participant had elected for payment of retirement benefits
if and when the Participant retires following his Disability.  Absent the
Participant's retirement election, payment will be made in a lump sum upon
Termination of Employment.


SECTION 4.8  TERMINATION OF EMPLOYMENT DUE TO SPECIAL CIRCUMSTANCES.

     If, other than as provided in Section 4.11, a Participant has an
         ----- ----
involuntary Termination of Employment in conjunction with a sale of assets or a
reorganization (including termination due to a specific job elimination), the
Participant's Account will be distributed in accordance with the method which
the Participant had elected for payment of retirement benefits under this Plan,
with payment commencing on the earliest date the Participant would have become
eligible to commence receiving the retirement benefit hereunder. During the
period between the Participant's Termination of Employment and the commencement
of payments under this

                                                                              15
<PAGE>
 
Plan, interest will be credited to the Participant's Account each year at the
applicable rate of interest for Accounts of living Participants.  Absent the
Participant's election with respect to the form of benefit to be paid by this
Plan at or after his retirement, payment will be made in a lump sum upon
Termination of Employment.


SECTION 4.9  VALUATION AND SETTLEMENT.

     The Settlement Date shall be the earlier of the date on which a lump sum is
paid or on which installment payments commence. The Settlement Date for an
Account shall be no more than 30 days after the last day of the month in which
the Participant or his Beneficiary becomes entitled to payments on account of
retirement, other Termination of Employment or death, unless the Participant has
elected to defer commencement of payments following retirement to a later date.
The Settlement Date for an Early Distribution or delayed payments following
retirement shall be the month that the Participant has elected for commencement
of such payments. The amount of a lump sum and the initial amount of installment
payments for a Participant's Account shall be based on the value of the
Participant's Account as of the valuation Date at the end of the immediately
preceding month before the Settlement Date. For example, the Valuation Date at
the end of December shall be used to determine a lump sum and/or the initial
amount of installment payments that will be made in the following January.


SECTION 4.10  SMALL BENEFIT.

     Notwithstanding any election made by the Participant, the Administrative
Committee, in its sole discretion, may pay any benefit in the form of a lump sum
payment to the Participant or any Beneficiary, if the lump sum amount of the
Account balance that remains in the Account following a distribution for any
reason, or which is payable to the Participant or Beneficiary when payments to
such Participant or Beneficiary would otherwise commence is less than $6,000.


SECTION 4.11  BENEFITS IN THE EVENT OF A CHANGE IN CONTROL.

     Notwithstanding the contrary provisions of Section 4.8, the provisions of
this Section 4.11 shall control in the event of Change in Control of the
Company.

     In the event of a Change in Control, as defined in Section 4.12, the full
amount of contributions and earnings accrued or credited to the Participant's
Account (as of the date immediately preceding the Change in Control) shall be
distributed to the Participant or the Participant's Beneficiary, if a Survivor
Benefit is being paid at the time of the Change in Control. Payment shall be
made in a form previously approved by the Administrative Committee and
previously elected by the Participant.

                                                                              16
<PAGE>
 
SECTION 4.12    DEFINITIONS.

     (a)  EVENTS CONSTITUTING A "CHANGE IN CONTROL". For purposes of this Plan,
a Change in Control will be deemed to have occurred as of the date that one or
more of the following occurs:

          (1)  Individuals who, as of the date hereof, constitute the entire
Board of Directors of the Company ("Incumbent Directors") cease for any reason
to constitute at least a majority of the Board; provided, however, that any
                                                --------  -------
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by the Company's shareholders, was approved by a vote of
at least a majority of the then Incumbent Directors shall be considered as
though such individual was an Incumbent Director, but excluding, for this
purpose any such individual whose initial assumption of office occurs as a
result of either an actual or threatened election contest, as such terms are
used in Rule 14a-11 under the Exchange Act or other actual or threatened
solicitation of proxies or consents by or on behalf of any Person (as defined
below) other than the Board;

          (2)  The stockholders of the Company shall approve (A) any merger,
consolidation or recapitalization of the Company (or, if the capital stock of
the Company is affected, any subsidiary of the Company), or any sale, lease, or
other transfer (in one transaction or a series of transactions contemplated or
arranged by any party as a single plan) of all or substantially all of the
assets of the Company (each of the foregoing being an "Acquisition Transaction")
where (1) the shareholders of the Company immediately prior to such Acquisition
Transaction would not immediately after such Acquisition Transaction
beneficially own, directly or indirectly, shares or other ownership interests
representing in the aggregate 80 percent (80%) or more of (a) the then
outstanding common stock or other equity interests of the corporation or other
entity surviving or resulting from such merger, consolidation or
recapitalization or acquiring such assets of the Company, as the case may be
(the "Surviving Entity") (or of the Combined Voting Power of the then
outstanding Voting securities of the Surviving Entity (or of its ultimate parent
corporation or other entity, if any) or (2) the Incumbent Directors at the time
of the initial approval of such Acquisition Transaction would not immediately
after such Acquisition Transaction constitute a majority of the board of
Directors, or similar managing group, of the Surviving Entity (or of its
ultimate parent corporation or other entity, if any), or (B) any plan or
proposal for the liquidation or dissolution of the Company;

          (3)  Any Person shall be or become the beneficial owner (as defined in
Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of
securities of the Company representing in the aggregate more than twenty percent
(20%) of either (A) the then outstanding shares of common stock of the Company
("Common Shares") or (B) the Combined Voting Power of all then outstanding
Voting Securities of the Company' provided, however, that notwithstanding the
                                  --------  -------                          
foregoing, a "Change of Control" shall not be deemed to have occurred for
purposes of this Subsection (3):

                                                                              17
<PAGE>
 
               (i)  Solely as a result of an acquisition of securities by the
Company which, by reducing the number of Common Shares or other Voting
Securities outstanding, increases (a) the proportionate number of Common Shares
beneficially owned by any Person to more than 20 percent of the Common Shares
then outstanding, or (b) the proportionate voting power represented by the
Voting Securities beneficially owned by any Person to more than 20 percent of
the Combined Voting Power of all then outstanding Voting Securities; or

               (ii) Solely as a result of an acquisition of securities directly
from the Company except for any conversion of a security that was not acquired
directly from the Company,

provided, further, that if any Person referred to in paragraph (1) or (2) of the
- --------  -------                                                               
Subsection (3) shall thereafter become the beneficial owner of any additional
Common Shares or other Voting Securities of the Company (other than pursuant to
a stock split, stock dividend or similar transaction), then a "Change of
Control" shall be deemed to have occurred for purposes of this Subsection (3).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
to have occurred as a result solely of a transaction in which assets of the
Company are contributed to an entity pursuant to the creation of a partnership
under the terms of certain agreements authorized by the Incumbent Directors on
July 25, 1997.

     (b)  For purposes of this Section 4.12:

          (1)  "Affiliate" shall mean, as to a specified Person, another Person
that directly, or indirectly through one or more intermediaries, controls or is
controlled by, or is under common control with, the specified Person, within the
meaning of such terms as used in Rule 405 under the Securities Act of 1933, as
amended, or any successor rule.

          (2)  "Combined Voting Power" shall mean the aggregate votes entitled
to be cast generally in the election of the Board of Directors, or similar
managing group, of a corporation or other entity by holders of then outstanding
Voting Securities of such corporation or other entity.

          (3)  "Equistar" shall mean Equistar Chemicals, LP, a Limited
Partnership organized under the laws of the State of Delaware

          (4)  "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

          (5)  "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
Liability Company organized under the laws of the State of Texas.

                                                                              18
<PAGE>
 
          (6)  "Person" shall mean any individual, entity (including, without
limitation, any corporation, partnership, trust, joint venture, association or
governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2) of the
Exchange Act and the rules and regulations thereunder); provided, however, that
                                                        --------  -------      
Person shall not include the Company, Equistar or LCR, any of their
subsidiaries, any employee benefit plan of the Company, Equistar or LCR or any
of their majority-owned subsidiaries or any entity organized, appointed or
established by the Company, Equistar, LCR or such subsidiaries for or pursuant
to the terms of any such plan.

          (7)  "Voting Securities" shall mean all securities of a corporation or
other entity having the right under ordinary circumstances to vote in an
election of the Board of Directors, or similar managing group, of such
corporation or other entity.

                                                                              19
<PAGE>
 
                                   ARTICLE V

                          DESIGNATION OF BENEFICIARY


SECTION 5.1  DESIGNATION OF BENEFICIARY.

     Each Participant shall have the right to designate a Beneficiary or
Beneficiaries to receive his interest in his Account upon his death. Such
designation shall be made on a form prescribed by and delivered to the Company.
The Participant shall have the right to change or revoke any such designation
from time to time by filing a new designation or notice of revocation with the
Company, and no notice to any Beneficiary nor consent by any Beneficiary shall
be required to effect any such change or revocation.

SECTION 5.2  FAILURE TO DESIGNATE BENEFICIARY.

     If a Participant fails to designate a Beneficiary before his death, or if
no designated Beneficiary survives the Participant, the Administrative Committee
shall direct the Company to pay the balance in his Account in a lump sum to the
executor or administrator for his estate.

                                                                              20
<PAGE>
 
                                  ARTICLE VI

                                ADMINISTRATION


Section 6.1  ADMINISTRATIVE COMMITTEE.

     The Benefits Administrative Committee for the Company shall act as this
Plan's Administrative Committee.


SECTION 6.2  RULES OF CONDUCT; ADMINISTRATIVE PROVISIONS.

     The Administrative Committee shall adopt such rules for the conduct of its
business and the administration of this Plan as it considers desirable;
provided, however, that such rules shall not conflict with the provisions of
- --------  -------                                                           
this Plan. Except as otherwise specifically provided in this Plan, all of the
administrative provisions (such as the benefit claims procedures) contained in
the 401(k) and Savings Plan shall apply to the administration of this Plan.

SECTION 6.3  LEGAL, ACCOUNTING, CLERICAL AND OTHER SERVICES.

     The Administrative Committee may authorize one or more of its members or
any agent to act on its behalf and may contract for legal, accounting, clerical
and other services to carry out this Plan. All expenses of the Administrative
Committee shall be paid by the Company.


SECTION 6.4  INTERPRETATION OF PROVISIONS.

     The Administrative Committee shall have the exclusive right and
discretionary authority to interpret the provisions of this Plan and to decide
questions arising in its administration. The decisions and interpretations of
the Administrative Committee shall be final and binding on the Company,
Employees and all other persons.

SECTION 6.5  RECORDS OF ADMINISTRATION.

     The Administrative Committee shall keep records reflecting the
administration of this Plan which shall be subject to audit by the Company.

                                                                              21
<PAGE>
 
SECTION 6.6  DENIAL OF CLAIM.

     The Administrative Committee shall provide adequate notice in writing to
any Employee or Beneficiary whose claim for benefits under this Plan has been
denied, setting forth the specific reasons for such denial. The Employee or
Beneficiary will be given an opportunity for a full and fair review by the
Administrative Committee of the decision denying the claim. The Employee or
Beneficiary shall be given 60 days from the date of the notice denying any such
claim within which to request such review.


SECTION 6.7  LIABILITY OF COMMITTEE.

     No member of the Administrative Committee shall be liable for any action
taken in good faith or for exercise of any power given the Administrative
Committee, or for the actions of other members of said Committee.

                                                                              22
<PAGE>
 
                                  ARTICLE VII

                         AMENDMENT AND DISCONTINUANCE


Section 7.1  AMENDMENT OF PLAN.

     This Plan may be amended from time to time by the Compensation Committee of
the Board of Directors of the Company.


SECTION 7.2  TERMINATION.

     The Company intends to continue this Plan indefinitely, but reserves the
right to terminate it at any time for any reason.


SECTION 7.3  EFFECT OF AMENDMENT OR TERMINATION.

     No amendment or termination of this Plan may adversely affect the benefit
payable to any former Employee receiving benefits under this Plan prior to the
effective date of the amendment or termination, or any Employee who, as of such
date, was eligible to receive a benefit under this Plan.

                                                                              23
<PAGE>
 
                                 ARTICLE VIII

                                 MISCELLANEOUS


SECTION 8.1  UNFUNDED BENEFIT PLAN.

     This Plan is intended to constitute a plan which is unfunded and maintained
primarily for the purpose of providing deferred compensation in the form of
additional retirement benefits to a select group of management or highly
compensated employees, as defined in Section 201(a)(2), 301(a)(3) and 401(a)(1)
of ERISA.


SECTION 8.2  UNSECURED GENERAL CREDITOR.

     Participants and their Beneficiaries shall have no legal or equitable
rights, claims or interests in any specific assets or property of the Company,
nor shall they be the Beneficiaries of, or have any rights, claims or interests
in any life insurance policies, annuity contracts, or the proceeds therefrom
owned, or which may be acquired by, the Company (the "Policies"). Any such
Policies or other assets of the Company shall be, and remain, the general,
unpledged, unrestricted assets of the Company. The Company's obligation under
the Plan shall be merely that of an unfunded and unsecured promise of the
Company to pay money in the future.


SECTION 8.3  GRANTOR TRUST.

     Although the Company is responsible for the payment of all benefits under
the Plan, the Company may, in its discretion, contribute funds to a grantor
trust for the purpose, as it deems appropriate, of paying benefits under this
Plan. Such trust may be irrevocable, but assets of the trust shall be subject to
the claims of creditors of Lyondell Petrochemical Company. To the extent any
benefits provided under the Plan are actually paid from the trust, the Company
shall have no further obligation with respect thereto but to the extent not so
paid, such benefits shall remain the obligation of, and shall be paid by, the
Company. The Employees shall have the status of unsecured creditors insofar as
their legal claim for benefits under the Plan and the Employees shall have no
security interest in the grantor trust.


SECTION 8.4  PAYMENTS AND BENEFITS NOT ASSIGNABLE.

     Payments to and benefits under this Plan are not assignable, transferable
or subject to alienation since they are primarily for the support and
maintenance of the Participants and their joint annuitants or Beneficiaries
after retirement. Likewise, such payments shall not be subject 

                                                                              24
<PAGE>
 
to attachments by creditors of, or through legal process against, the Company,
the Administrative Committee or Participant.


SECTION 8.5 NO RIGHT OF EMPLOYMENT.

     The provisions of this Plan shall not give an Employee the right to be
retained in the service of the Company nor shall this Plan or any action taken
under the Plan be construed as a contract of employment.


SECTION 8.6  ADJUSTMENTS.

     At the Company's request, the Administrative Committee may, with respect to
a Participant, adjust such Participant's benefit under this Plan or make such
other adjustments with respect to such Participant as are required to correct
administrative errors or provide uniform treatment of Participants in a manner
consistent with the intent and purpose of this Plan.


SECTION 8.7  OBLIGATION TO COMPANY.

     If a Participant becomes entitled to a distribution of benefits under the
Plan, and if at such time the Participant has outstanding any debt, obligation,
or other liability representing an amount owing to the Company, or any benefit
plan maintained by the Company, then the Company may offset such amount owed to
it or such benefit plan against the amount of benefits otherwise distributable.
Such determination shall be made by the Administrative Committee.


SECTION 8.8  PROTECTIVE PROVISIONS.

     Each Participant shall cooperate with the Company by furnishing any and all
information requested by the Company in order to facilitate the payment of
benefits hereunder, taking such physical examinations as the Company may deem
necessary and taking such other relevant action as may be requested by the
Company.  If a Participant refuses to cooperate, the Company shall have no
further obligation to the Participant under the Plan.  If the Participant makes
any material misstatement of information or nondisclosure of medical history,
then no benefits will be payable hereunder to such Participant or his
Beneficiary, provided, that in the Company's sole discretion, benefits may be
payable in an amount reduced to compensate the Company for any loss, cost,
damage or expense suffered or incurred by the Company as a result in any way of
any such action, misstatement or nondisclosure.

                                                                              25
<PAGE>
 
SECTION 8.9  GENDER, SINGULAR AND PLURAL.

     All pronouns and any variations thereof shall be deemed to refer to the
masculine, feminine, or neuter, as the identity of the person or persons may
require. As the context may require, the singular may be read as the plural and
the plural as the singular.


SECTION 8.10  LAW GOVERNING.

     This Plan shall be construed, regulated and administered under the laws of
the State of Texas, except to the extent that such laws are preempted by ERISA.


SECTION 8.11  NOTICE.

     Any notice or filing required or permitted to be given to the
Administrative Committee under the Plan shall be sufficient if in writing and
hand delivered, or sent by registered or certified mail, to the principal office
of the Company, directed to the attention of the Secretary of the Administrative
Committee. Such notice shall be deemed given as to the date of delivery or, if
delivery is made by mail, as of the date shown on the postmark on the receipt
for registration or certification.


SECTION 8.12  SUCCESSORS AND ASSIGNS.

     This Plan shall be binding upon the Company and its successors and assigns.


SECTION 8.13  PROVISIONS FOR INCAPACITY.

     If the Administrative Committee deems any person entitled to receive any
payment under the provisions of this Plan incapable of receiving or disbursing
the same by reason of minority, illness or infirmity, mental incompetency, or
incapacity of any kind, the Administrative Committee may, in its sole
discretion, take any one or more of the following actions: it may apply such
payment directly for the comfort, support and maintenance of such person; it may
reimburse any person for any such support theretofore supplied to the person
entitled to receive any such payment; or it may pay such payment to any other
person selected by the Administrative Committee to disburse such payment for the
comfort, support and maintenance of the person entitled thereto, including,
without limitations, to any relative who has undertaken, wholly or partially,
the expense of such person's comfort, care and maintenance, or any institution
in whose care or custody the person entitled to the payment may be. The
Administrative Committee may, in its sole discretion, deposit any payment due to
a minor to the minor's credit in any savings or commercial bank of the
Administrative Committee's choice.

                                                                              26
<PAGE>
 
                                  APPENDIX A

            EXAMPLE OF SURVIVOR BENEFIT DETERMINATION AND PRORATION

John Doe: Current Age - 49
Presumed to die on July 1, 1998

<TABLE>
<CAPTION>
   --------------------------------------------------------------------------
                            Award                 % Deferred          Amount 
   --------------------------------------------------------------------------
   <S>                      <C>                   <C>                 <C>    
   1996                     $39,000               100%                $39,000
   --------------------------------------------------------------------------
   1997                          -0-              10%                     -0-
   --------------------------------------------------------------------------
   1998                     $60,000               10%                 $ 6,000
   --------------------------------------------------------------------------
   1999                     $60,000               10%                 $ 7,000
   --------------------------------------------------------------------------
   2000                     $70,000               10%                 $ 7,000
   --------------------------------------------------------------------------
   Total                                                              $58,000
   -------------------------------------------------------------------------- 
</TABLE>

<TABLE>
<CAPTION>
   --------------------------------------------------------------------------
                            Base Salary           % Deferred          Amount 
   --------------------------------------------------------------------------
   <S>                      <C>                   <C>                 <C>    
   1995                     $140,000              20%                 $28,000
   --------------------------------------------------------------------------
   1996                     $164,000               0%                     -0-
   --------------------------------------------------------------------------
   1997                     $170,000              10%                 $17,000
   --------------------------------------------------------------------------
   1998                      180,000              10%                 $18,000
   --------------------------------------------------------------------------
   1999                      190,000              10%                 $19,000
   --------------------------------------------------------------------------
   Total                                                              $82,000
   -------------------------------------------------------------------------- 
</TABLE>

CALCULATION OF SURVIVOR BENEFIT -- GREATER OF:
 
     (a)  40 percent of Deferral Election

          $58,000 + $82,000 = $140,000*40% = $56,000 per year for 15 years.

          The present value of this benefit would be determined by multiplying
          the annual benefit ($56,000) by the number of years the payment is to
          be made (15) and then applying a discount rate.

          If the discount rate is 7.8%, the present value of this benefit would
          be approximately $500,000.

     (b)  Actual Account Balance
 
          Amounts deferred:
          $39,000 + $6,000 + $28,000 + $17,000 + $9,000 =           $ 99,000
          Interest (est.)                                           $ 21,000
                                                                    --------
          Total                                                     $120,000

          $120,000 paid out over 15 years

          The annual Survivor Benefit would be $56,000 for 15 years as (a) is
          greater than (b).

PRORATION OF THE ANNUAL SURVIVOR BENEFIT BETWEEN COMPANY AND LYONDELL-CITGO:

          Company's Share: $56,000*75.5/140 = $30,200

          LYONDELL-CITGO's Share:  $56,000*64.5/140 = $25,800

                                                                              27

<PAGE>
 
                                                                    EXHIBIT 10.8





                        LYONDELL PETROCHEMICAL COMPANY
                     SUPPLEMENTAL EXECUTIVE BENEFIT PLANS
                                TRUST AGREEMENT

                           (AS AMENDED AND RESTATED
                       EFFECTIVE AS OF FEBRUARY 1, 1997)
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE> 
<CAPTION> 
                                                                          PAGE
<S>                                                                       <C>
Recitals................................................................... 1
Section 1.  Creation of the Trust.......................................... 2
Section 2.  Limitation on Use of Funds..................................... 3
Section 3.  Change in Control.............................................. 3
Section 4.  Independent Plan Administrator................................. 8
Section 5.  Excess Revision................................................ 9
Section 6.  Authority of Investment Officer................................ 10
Section 7.  Duties and Powers of Trustee with
              Respect to Investments....................................... 10
Section 8.  Additional Powers and Duties of the Trustee.................... 13
Section 9.  Insurance Policies and Contracts............................... 14
Section 10. Participating Plan Records..................................... 15
Section 11. Valuation...................................................... 15
Section 12. Participant Records Prior to and
              Following a Change in Control................................ 15
Section 13. Trustee Accounts............................................... 16
Section 14. Investment of Cash............................................. 17
Section 15. Payments by the Trustee........................................ 18
Section 16. Determination of Change in Control............................. 19
Section 17. Trustee Compensation and Trust Expenses........................ 19
Section 18. Payment of Taxes By Trustee.................................... 20
Section 19. Custodians and Agents.......................................... 20
Section 20. Liability for Benefit Payments................................. 20
Section 21. Company Insolvency............................................. 20
Section 22. Trustee Responsibility for Plan Administration
              and Trust Record Keeping After
              Change in Control............................................ 22
Section 23. Trustee Standards of Performance
              and Indemnification.......................................... 23
Section 24. Removal and Resignation of Trustee............................. 24
Section 25. Termination of Participating Plan or Plans..................... 24
Section 26. Rights of Company to Trust Assets.............................. 25
Section 27. Amendment of Trust............................................. 25
Section 28. Termination of Trust........................................... 26
Section 29. Successors..................................................... 27
Section 30. Communications................................................. 27
Section 31. Unclaimed Distributions........................................ 27
Section 32. Prohibition of Assignments..................................... 28
Section 33. Governing Law.................................................. 28
Section 34. Execution...................................................... 28

Appendix A................................................................. 30
</TABLE>

                                       i
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                     SUPPLEMENTAL EXECUTIVE BENEFIT PLANS
                                TRUST AGREEMENT



     THIS AGREEMENT, as amended and restated as of February 1, 1997, between
LYONDELL PETROCHEMICAL COMPANY (the "Company"), and STATE STREET BANK AND TRUST
COMPANY, a banking corporation having its principal place of business at 225
Franklin Street, Boston, Massachusetts, 01201 (the "Trustee");

                                R E C I T A L S

     A.   Effective July 1, 1994, the Company and the Trustee entered into this
Agreement to create a Trust (defined under Section 1 of this Trust Agreement)
for purposes of the Lyondell Petrochemical Company Supplementary Executive
Retirement Plan and the Lyondell Petrochemical Company Executive Deferral Plan
and any benefit plans that may be established and maintained by the Company for
executive employees of the Company after the effective date of this Trust, that
permit funding by this Trust, and that are established and maintained to provide
deferred compensation for a select group of management or highly compensated
employees. The benefit plans that may be funded by this Trust are listed in
Appendix A attached hereto and shall hereinafter be referred to as the
"Participating Plans".

     B.   The amount and timing of benefit payments (the "Supplemental
Benefits") to which the participants of the Participating Plans (the "Trust
Beneficiaries") are or may become entitled under each of the Participating Plans
are set forth in the Participating Plans.

     C.   The Company established this trust fund to assist it in accumulating
the amounts necessary to satisfy its contractual liability to pay Supplemental
Benefits under the Participating Plans.

     D.   The Company is obligated to pay all Supplemental Benefits from its
general assets to the extent not paid by this Trust and the amendment and
restatement of this Trust Agreement shall not reduce or otherwise affect the
Company's continuing liability to pay Supplemental Benefits from such assets,
except that the Company's liability shall be offset by actual benefit payments
made from this Trust.
<PAGE>
 
     E.   The trust continued by this amended and restated Trust Agreement is
intended to be a "grantor trust" with the result that the corpus and income of
the Trust shall be treated as assets and income of the Company pursuant to
Sections 671 through 679 of the Internal Revenue Code of 1986, as amended (the
"Code").

     F.   The Company intends that the Trust shall at all times be subject to
the claims of the Company's creditors as herein provided and that the
Participating Plans shall not be deemed funded within the meaning of the
Employee Retirement Income Security Act of 1974, as amended, ("ERISA") solely by
virtue of the existence of this Trust Agreement.

NOW, THEREFORE, in consideration of the mutual covenants herein contained, the
parties hereto agree as follows:


                                   SECTION 1

                             CREATION OF THE TRUST

     There is hereby established and continued with the Trustee a trust
consisting of all sums paid to it for purposes of the Participating Plans,
investments thereof and any earnings, appreciations or losses thereon, which,
less disbursements made by Trustee, and amounts paid to the Company as provided
in Section 2 of this Trust Agreement, are referred to herein as the "Trust" and
shall be dealt with as provided in this Trust Agreement. The Trust shall be held
for the exclusive purpose of providing payments to Trust Beneficiaries in
accordance with the provisions of the Participating Plans, and defraying
reasonable expenses of administration in accordance with the provisions of this
Trust Agreement until all such payments required by this Trust Agreement have
been made, subject to the provisions on the use of Funds under Section 2 of this
Trust Agreement, and to the requirement that the Trust shall at all times be
subject to the claims of the general creditors of the Company as set forth in
Sections 21.1 and 21.2 of this Trust Agreement. The Trustee shall have no duty
or authority to inquire into the correctness of amounts tendered to it or to
enforce the collection of any contribution by the Company.

     The Company shall direct the Trustee to establish a separate subtrust
("Subtrust") for each Plan to which the Trustee shall credit contributions it
receives which are earmarked for that Plan and Subtrust. Each Subtrust shall
reflect an undivided interest in assets of the trust fund and shall not require
any segregation of particular assets. When Subtrusts are established, all

                                       2
<PAGE>
 
contributions shall be designated by the Company for a particular Subtrust.
However, any contribution received by the Trustee which is not designated by the
Company for a particular Subtrust before a Change in Control shall be allocated
among the Subtrusts in proportion to each Participating Plan's pro rata interest
in the Trust, as calculated during the last Valuation.

     When a Subtrust is established at a date subsequent to execution of this
Agreement, the Trustee shall allocate the Trust assets among the separate
Subtrusts as directed by the Company prior to a Change in Control.

     The Company may direct the Trustee, or the Independent Plan Administrator
may determine on its own initiative after a Change in Control, to maintain a
separate sub-account within each Subtrust for a Plan for each Participant who is
covered by the Subtrust. If so directed, each sub-account in a Subtrust shall
reflect an individual interest in assets of the Subtrust and, as much as
possible, shall operate in the same manner as if it were a separate Subtrust.

     The Trustee shall allocate investment earnings and losses and expenses of
the trust fund as of a valuation date among the Subtrusts in proportion to their
balances. Payments to creditors as directed by a court of competent jurisdiction
in the event of the Company's insolvency shall be charged against the Subtrusts
in proportion to their balances, except that payment of Plan benefits to a
Participant as a general creditor shall be charged against the Subtrust for that
Plan.

     Assets allocated to a Subtrust for one Plan may not be used to provide
benefits under any other Plans until all benefits under such Plan have been paid
in full, except that excess assets of a Subtrust may be transferred to other
Subtrusts.

                                   SECTION 2

                          LIMITATION ON USE OF FUNDS

     No part of the corpus of the Trust shall be recoverable by the Company,
borrowed by or against for the benefit of the Company or used for any purpose
other than for the exclusive purpose of providing payments to Trust
Beneficiaries in accordance with the provisions of the Participating Plans and
defraying reasonable expenses of administration in accordance with the
provisions of this Trust Agreement until all such payments required by this
Trust Agreement have been made; provided, however, that (i) nothing in this
Section 2 shall be deemed to limit or otherwise 

                                       3
<PAGE>
 
prevent the payment from the Trust of (a) amounts described in Section 5 of this
Trust Agreement, (b) expenses and other charges as provided in Section 17 and 18
of this Trust Agreement, or (c) the application of the Trust as provided in
Sections 15.5 or 28 of this Trust Agreement, and (ii) the Trust shall at all
times be subject to the claims of the general creditors of the Company as set
forth in Section 21.1 and 21.2 of this Trust Agreement.

                                   SECTION 3

                               CHANGE IN CONTROL

     Section 3.1.  General. Various provisions of this Trust Agreement provide
     ------------     
for certain rights and obligations upon and following a Change in Control of the
Company.

     Section 3.2. Definition of "Change in Control". For purposes of this Trust
     ------------       
Agreement, a "Change in Control" shall be deemed to have occurred as of the date
that one or more of the following occurs:

     A.   Individuals who, as of the date hereof, constitute the entire Board of
     Directors of the Company ("Incumbent Directors") cease for any reason to
     constitute at least a majority of the Board; provided, however, that any
                                                  --------  -------          
     individual becoming a director subsequent to the date hereof whose
     election, or nomination for election by the Company's shareholders, was
     approved by a vote of at least a majority of the then Incumbent Directors
     shall be considered as though such individual was an Incumbent Director,
     but excluding, for this purpose any such individual whose initial
     assumption of office occurs as a result of either an actual or threatened
     election contest, as such terms are used in Rule 14a-11 under the Exchange
     Act or other actual or threatened solicitation of proxies or consents by or
     on behalf of any Person (as defined below) other than the Board; provided,
                                                                      -------- 
     further, that in the event ARCO at any time determines to achieve minority
     -------                                                                   
     representation on the Company's Board of Directors approximately equal to
     its then ownership percentage of the Company's common stock, its
     implementation of such determination through the election of ARCO employees
     as directors of the Company shall not be deemed to be a Change in Control
     and such ARCO employees shall constitute Incumbent Directors;

     B.   The stockholders of the Company shall approve (1) any merger,
     consolidation or recapitalization of the Company (or, if the capital stock
     of the Company is affected, any

                                       4
<PAGE>
 
     subsidiary of the Company), or any sale, lease, or other transfer (in one
     transaction or a series of transactions contemplated or arranged by any
     party as a single plan) of all or substantially all of the assets of the
     Company (each of the foregoing being an "Acquisition Transaction") where
     (i) the shareholders of the Company immediately prior to such Acquisition
     Transaction would not immediately after such Acquisition Transaction
     beneficially own, directly or indirectly, shares or other ownership
     interests representing in the aggregate eighty percent (80%) or more of (a)
     the then outstanding common stock or other equity interests of the
     corporation or other entity surviving or resulting from such merger,
     consolidation or recapitalization or acquiring such assets of the Company,
     as the case may be (the "Surviving Entity") (or of its ultimate parent
     corporation or other entity, if any), and (b) the Combined Voting Power of
     the then outstanding Voting Securities of the Surviving Entity (or of its
     ultimate parent corporation or other entity, if any) or (ii) the Incumbent
     Directors at the time of the initial approval of such Acquisition
     Transaction would not immediately after such Acquisition Transaction
     constitute a majority of the Board of Directors, or similar managing group,
     of the Surviving Entity (or of its ultimate parent corporation or other
     entity, if any), or (2) any plan or proposal for the liquidation or
     dissolution of the Company;

     C.   Any Person except for ARCO shall be or become the beneficial owner (as
     defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
     indirectly, of securities of the Company representing in the aggregate more
     than twenty percent (20%) of either (1) the then outstanding shares of
     common stock of the Company ("Common Shares") or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company; provided,
                                                                     -------- 
     however, that notwithstanding the foregoing, a "Change of Control" shall
     -------                                                                 
     not be deemed to have occurred for purposes of this Subsection (C):

          (i)  Solely as a result of an acquisition of securities by the Company
          which, by reducing the number of Common Shares or other Voting
          Securities outstanding, increases (a) the proportionate number of
          Common Shares beneficially owned by any Person to more than twenty
          percent (20%) of the Common Shares then outstanding, or (b) the
          proportionate voting power represented by the Voting Securities
          beneficially owned by any Person to more than twenty percent (20%) of
          the Combined Voting Power of all then outstanding Voting Securities;
          or
                                         
                                       5
<PAGE>
 
          (ii) Solely as a result of an acquisition of securities directly from
          the Company except for any conversion of a security that was not
          acquired directly from the Company,

     Proided further, that if any Person referred to in paragraph (i) or (ii) of
     ------- -------        
     this Subsection (C) shall thereafter become the beneficial owner of any
     additional Common Shares or other Voting Securities of the Company (other
     than pursuant to a stock split, stock dividend or similar transaction),
     then a "Change of Control" shall be deemed to have occurred for purposes of
     this Subsection (C); or

     D.   ARCO shall become the owner, directly or indirectly, of securities of
     the Company representing in the aggregate more than fifty percent (50%) of
     either (1) the then outstanding Common Shares or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company except as
     the result of an acquisition of securities by the Company which, by
     reducing the number of Common Shares or other Voting Securities
     outstanding, increases (x) the proportionate number of Common Shares
     beneficially owned by ARCO to more than fifty percent (50%) of the Common
     Shares then outstanding, or (y) the proportionate voting power represented
     by the Voting Securities beneficially owned by ARCO to more than fifty
     percent (50%) of the Combined Voting Power of all then outstanding Voting
     Securities; provided, however, that if thereafter ARCO becomes the
                 --------  -------                                     
     beneficial owner of any additional Common Shares or other Voting Securities
     of the Company (other than pursuant to a stock split, stock dividend or
     similar transaction) the exception provided above shall no longer apply;
     provided, further, that for purposes of this Subsection (D), neither record
     --------  -------                                                          
     ownership of common stock of the Company by the Trustee for ARCO's 401(a)
     qualified plans nor beneficial ownership of common stock of the Company by
     any of ARCO's directors for their personal account shall be deemed to
     constitute "indirect" ownership of common stock of the Company by ARCO;
     provided, further, that notwithstanding any contrary provision of this
     --------  -------                                                     
     Trust Agreement, no Change in Control shall be deemed to have occurred
     pursuant to this Subsection (D) if as a result of an inadvertent act ARCO
     becomes the owner, directly or indirectly, of additional Common Shares or
     Voting Securities and such securities are sold or otherwise disposed of by
     ARCO within 30 days after ARCO discovers, or is notified by the Company as
     to, the potential Change of Control resulting from such ownership, so that,
     as a result of such subsequent sale or other disposition by ARCO, no Change
     in Control would otherwise be deemed to have occurred pursuant to the terms
 
                                       6
<PAGE>
 
     (excluding this proviso) of this Subsection (D).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
     to have occurred as a result solely of (1) the registration by ARCO of the
     Exchangeable Notes pursuant to the Registration Statement, (2) the issuance
     and sale by ARCO of the Exchangeable Notes to the underwriters in
     accordance with the Registration Statement, or (3) prior to the maturity of
     the Exchangeable Notes, purchases and sales of the Exchangeable Notes.

     Section 3.3.  Funding on Change in Control. The Company, within 30 days
     ------------                                                            
following a Change in Control, shall be required to irrevocably deposit
additional cash or other property, acceptable to the Trustee, to this Trust in
an amount equal to the Certified Benefit Values, as described in Section 5, plus
an amount equal to 100% of the actuarial present value of any additional
benefits, payments or supplements, as certified by an Enrolled Actuary
unaffiliated with the Company, which may become payable as a result of a Change
in Control, less the present value of Trust assets determined as of the date of
the Change in Control.

     Section 3.4.  For purposes of Section 3.1 of this Trust Agreement:
     ------------                                                      

     A.   "Affiliate" shall mean, as to a specified Person, another Person that
     directly, or indirectly through one or more intermediaries, controls or is
     controlled by, or is under common control with, the specified Person,
     within the meaning of such terms as used in Rule 405 under the Securities
     Act of 1933, as amended, or any successor rule.

     B.   "ARCO" shall mean Atlantic Richfield Company and any of its
     Affiliates, excluding the Company.

     C.   "Combined Voting Power" shall mean the aggregate votes entitled to be
     cast generally in the election of the Board of Directors, or similar
     managing group, of a corporation or other entity by holders of then
     outstanding Voting Securities of such corporation or other entity.

     D.   "Exchangeable Notes" shall mean the debt securities exchangeable upon
     maturity, at ARCO's option, into shares of the Company's common stock or
     cash, as such debt securities are described in the Registration Statement.

     E.   "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
     Liability Company organized under the laws of the State of Texas.

                                       7
<PAGE>
 
     F.   "Person" shall mean any individual, entity (including, without
     limitation, any corporation, partnership, trust, joint venture, association
     or governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2)
     of the Exchange Act and the rules and regulations thereunder); provided,
                                                                    -------- 
     however, that Person shall not include the Company or LCR, any of their
     -------                                                                
     subsidiaries, any employee benefit plan of the Company or LCR or any of
     their majority-owned subsidiaries or any entity organized, appointed or
     established by the Company, LCR or such subsidiaries for or pursuant to the
     terms of any such plan.

     G.   "Registration Statement" shall mean ARCO's registration statement on
     Form S-3 (Registration No. 33-53481) with respect to the Exchangeable
     Notes.

     H.   "Voting Securities" shall mean all securities of a corporation or
     other entity having the right under ordinary circumstances to vote in an
     election of the Board of Directors, or similar managing group, of such
     corporation or other entity.


                                   SECTION 4

                        INDEPENDENT PLAN ADMINISTRATOR

     Various provisions of this Trust Agreement refer to the term "Independent
Plan Administrator" which shall mean, unless stated otherwise in a specific
provision of this Trust Agreement, and, except as provided below, an entity
which is unrelated to, and unaffiliated with, the Company, and which, prior to a
Change in Control has accepted in writing the position of Independent Plan
Administrator under this Trust Agreement. The Independent Plan Administrator
shall not be considered to be related to or affiliated with the Company solely
as a result of an agreement between the Independent Plan Administrator and the
Company to provide individual financial counseling services to specified Company
executives. The Independent Plan Administrator shall be appointed by the Company
and shall have its duties specified in an agreement executed by the Company and
the

                                       8
<PAGE>
 
Independent Plan Administrator prior to a Change in Control. The Trustee shall
be given advance written notification of such appointment by the Company.
Following a Change in Control, if the Company had failed to designate an
Independent Plan Administrator prior to a Change in Control, the Independent
Plan Administrator shall be appointed by the Trustee following a Change in
Control and shall have its duties specified in an agreement executed by the
Trustee and the Independent Plan Administrator. In the event the Independent
Plan Administrator fails to act, provides services to the Company other than in
its capacity as Independent Plan Administrator other than as provided above, or
resigns, the Company prior to a Change in Control, or the Trustee after a Change
in Control, shall retain a successor Independent Plan Administrator.
Notwithstanding any other provision of this Trust Agreement, the Trustee shall
be responsible only for the prudent selection of an Independent Plan
Administrator after a Change in Control (i) following notice by the Company or
the Independent Plan Administrator of disqualification of the Independent Plan
Administrator through the provision of services to the Company other than in its
capacity as Independent Plan Administrator, (ii) upon resignation or failure to
act by the Company-appointed Independent Plan Administrator, or (iii) in the
event the Company failed to appoint an Independent Plan Administrator prior to a
Change in Control. The Trustee shall be entitled to conclusively rely on the
determinations of a qualified Independent Plan Administrator.


                                   SECTION 5

                               EXCESS REVERSION

     Prior to a Change in Control, upon a determination that the assets of the
Trust have a value exceeding one hundred twenty-five percent (125%) of the
actuarial present value of accrued but unpaid benefits of the Participating
Plans, considered on the basis of assets being allocated to each Participating
Plan, all or a portion of the amount of such assets which constitute the "Excess
Reversion" (as defined below) may be repaid to the Company upon direction of the
Company. However, prior to any such repayment, the Company must deliver to the
Trustee a certified statement by an actuary who is an Enrolled Actuary under
ERISA and who is not affiliated with the Company of (i) the amount equal to one
hundred (100%) percent of the actuarial present value of the accrued but unpaid
benefits under the Participating Plans, calculated on an individual plan basis,
as described above, (the "Certified Benefit Values"), (ii) the value of the
Trust assets, allocated to each Participating Plan, as described above, and
(iii) the amount, if any, by which the value of the Trust assets under (ii)
exceeds the Certified Benefit Values under (i), and (iv) the amount, if any, by
which the value of the Trust assets under (ii) exceeds one hundred twenty-five
(125%) percent of the Certified Benefit Values (the "Excess Reversion"). The
actuary shall make each determination required to prepare the certified
statement based on reasonable factors, assumptions and tables (as determined
solely by such actuary). The Trustee shall repay assets of the Trust to the
Company as directed by the Company and in an

                                       9
<PAGE>
 
amount up to but not greater than the Excess Reversion. Any repayment of assets
of the Trust to the Company may be made only prior to a Change in Control and
shall be made within thirty (30) days (or as soon as practicable) after the
later of the Trustee's receipt of the certified statement by the actuary and the
Company's direction to make such a payment. Any separate allocations of assets
pursuant to this Section 5 shall be solely for the purpose of completing the
valuation tests described in this Section and shall not reflect any legal
commitment of assets to any Participating Plan or to any Trust Beneficiary.


                                   SECTION 6

                        AUTHORITY OF INVESTMENT OFFICER

     Prior to a Change in Control, the Trustee shall be subject to the direction
of the Investment Officer (as defined below) of the Company with respect to the
investment of the assets of the Trust. Unless the Company and the Trustee have
mutually agreed in a separate writing that the Trustee shall have and exercise
investment discretion with respect to all or a portion of the assets of the
Trust, the Company shall have complete discretion with respect to the investment
of such assets at all times prior to a Change in Control, and shall direct the
Trustee accordingly. From time to time, the Trustee shall be notified in a
writing signed by an officer of the Company of the person or persons
constituting the "Investment Officer" for purposes of this Section and the
Trust. In each such notice, the Company shall warrant that all directions given
by the Investment Officer are proper. The Trustee shall have no responsibility
to review, or to consider the propriety of holding or selling any life
insurance, retirement income or annuity policies or contracts.

Notwithstanding the Company's discretion to invest the Trust assets, the Company
shall not exercise this discretion to reacquire part or all of the assets held
in the Trust by substitution of or exchange for any other property held by the
Company directly or indirectly through any third party, related or unrelated,
and whether or not the property is equivalent, marketable, liquid, or secured.


                                   SECTION 7
                                        
           DUTIES AND POWERS OF TRUSTEE WITH RESPECT TO INVESTMENTS

     After a Change in Control, the Trustee shall have sole discretion to invest
and reinvest the assets of, and to invest any 

                                      10
<PAGE>
 
additions to, the Trust in personal property consisting of equity securities,
debt instruments at the time of purchase rated not less than BBB- by Standard &
Poor's Corporation and its successors ("S&P") or Baa3 by Moody's Investor
Service, Inc. and its successors ("Moody's) or the equivalent of such ratings by
S&P or Moody's for the types of investments specified in Section 14 of this
Trust Agreement ("Investment Grade Securities") with the power to appoint any
independent investment manager to fulfill such obligation; provided, however,
that (i) the Trustee shall be subject to any prior directions and instructions
of the Company prior to a Change in Control regarding insurance, retirement
income or annuity policies or contracts unless the Independent Plan
Administrator otherwise directs the Trustee, (ii) the Independent Plan
Administrator shall have sole power on and after a Change in Control regarding
the management, including the purchase, sale or retention (including all powers
of the Company under Sections 7(C) and 9 of this Trust Agreement) of any
insurance, retirement income or annuity policies or contracts, (iii) any such
powers of the Trustee or Independent Plan Administrator described above may not
be delegated, in whole or in part, after a Change in Control to the Company or
any affiliate of the Company, and (iv) the Trustee shall not be required to
liquidate any investments that were made pursuant to the directions of the
Investment Officer that are not Investment Grade Securities. Subject to the
foregoing provisions of Sections 6 and 7 of this Trust Agreement, the Trustee
shall have the following powers:

     A.   To invest and reinvest the Trust, without distinction between
     principal and income, in any form of domestic or foreign real or personal
     property, whether or not productive of income or consisting of wasting
     assets, provided that investments of the Plan shall be diversified so as to
     minimize the risk of large losses, unless under the circumstances it is
     clearly prudent not to do so;

     B.   To sell, convey, redeem, exchange, grant options for the purchase or
     exchange of, or otherwise dispose of, any real or personal property, other
     than an exchange of Trust assets to the Company as described in Section 6,
     at public or private sale, for cash or upon credit, with or without
     security, without obligation on the part of any person dealing with the
     Trustee to see to the application of the proceeds of, or to inquire into
     the propriety of, any such disposition;

     C.   To purchase and maintain, as owner, life insurance policies as
     provided in Section 9 of this Trust Agreement and only as directed by the
     Investment Officer of the Company

                                      11
<PAGE>
 
     prior to a Change in Control and the Independent Plan Administrator after a
     Change in Control;

     D.   To exercise, personally or by general or limited proxy or power of
     attorney, all voting and other rights appurtenant to any investment held in
     the Trust and to delegate discretionary power to exercise all or any such
     rights to trustees of a voting trust for any period of time;

     E.   To join in or oppose any reorganization, recapitalization,
     consolidation, merger or liquidation or any plan therefor, or any lease,
     mortgage or sale of the property of any organization the securities of
     which are held in the Trust; to pay from the Trust any assessments, charges
     or compensation specified in any plan of reorganization, recapitalization,
     consolidation, merger or liquidation; to deposit any property with any
     committee or depository; and to retain any property allotted to the Trust
     in any reorganization, recapitalization, consolidation, merger or
     liquidation;

     F.   To exercise or sell, personally or by general or limited power of
     attorney, any conversion, subscription or other rights, including the right
     to vote, appurtenant to any investment held in the Trust;

     G.   To borrow money for purposes of this Trust Agreement in any amount and
     upon any reasonable terms and conditions from any lender (other than the
     Trustee in its individual capacity), and to pledge or mortgage any property
     held in the Trust to secure the repayment of any such loan;

     H.   To compromise, settle or arbitrate any claim, debt, or obligation of
     or against the Trust; to enforce or abstain from enforcing any rights,
     claim, debt or obligation; and to abandon any property determined by it to
     be worthless;

     I.   To commence or defend suits or legal proceedings and to represent the
     Trust in all suits or legal proceedings; to settle, compromise or submit to
     arbitration any claims, debts or damages, due to or owing from the Trust;

     J.   To engage any legal counsel, including counsel to the Company, any
     enrolled actuary, or any other suitable agents; to consult with such
     counsel, enrolled actuary, or agents with respect to the construction of
     this Trust Agreement, the duties of the Trustee hereunder, the transactions
     contemplated by this Trust Agreement or any act which the Trustee proposes
     to take or omit; to rely upon the advice of

                                      12
<PAGE>
 
     such counsel, enrolled actuary or agents and to pay all reasonable fees,
     expenses and compensations of such counsel, actuary or agents; and

     K.   To organize and incorporate under the laws of any state one or more
     corporations (and to acquire an interest in any corporation that it may
     have organized and incorporated) for the purpose of acquiring and holding
     title to any property, interest or rights that the Trustee is authorized to
     acquire.


                                   SECTION 8

                  ADDITIONAL POWERS AND DUTIES OF THE TRUSTEE

     Following a Change in Control should the Company attempt to enjoin any
benefit payment (other than for reasons of manifest error) that the Trustee has
been directed to make under the terms of this Trust Agreement, the Trustee shall
commence legal action to allow such payment. The Trustee may withdraw from the
Trust assets any amounts it deems necessary to pay legal expenses, including
attorneys' fees, incurred in the course of such legal action. Under no
circumstances shall the Trustee be required to make such payments for benefits
or expenses from any source other than the Trust. Except as otherwise limited by
Section 6, the Trustee shall also have the following powers:

     A.   To cause any asset, real or personal, to be held in a corporate
     depository or federal book entry account system or registered in the
     Trustee's name or in the name of a nominee or in such other form as the
     Trustee deems best without disclosing the trust relationship; provided,
     however, that nothing contained in this Section shall be deemed to relieve
     the Trustee of any custodial responsibility allocated to it under this
     Trust Agreement;

     B.   To employ agents in the management of the Trust, including employees
     of the Company and its subsidiaries and affiliates prior to a Change in
     Control, provided, that the Trustee shall be responsible for the acts of
     such agents (other than acts of the United States Postal Service) as much
     as if they were acts of the Trustee;

     C.   To make, execute and deliver, as the Trustee, any deeds, leases,
     notes, bonds, guarantees, mortgages, conveyances, contracts, waivers,
     releases or other instruments in writing that the Trustee may deem
     necessary or desirable in the exercise of its powers under this Trust
     Agreement;

                                      13
<PAGE>
 
     D.   To transfer assets of the Trust to a successor Trustee as provided in
     Section 24 of this Trust Agreement;

     E.   To hold any portion of the Trust in cash pending investment, or for
     the payment of expenses or Supplemental Benefits; and

     F.   To exercise, generally, any of the powers which an individual owner
     might exercise in connection with property, either real, personal or mixed
     held by the Trust and to do all other acts that the Trustee may deem
     necessary or proper to carry out any of the powers set forth in this Trust
     Agreement or otherwise in the best interests of the Trust.


                                   SECTION 9

                       INSURANCE POLICIES AND CONTRACTS
                                        
     
     Prior to a Change in Control, the Company reserves the right to transfer
life insurance, retirement income or annuity policies or contracts, to the
Trust, regardless of the nature or type of such contract and regardless of the
Company's interest in, or power to direct the investments under, such policies
or contracts, or prior to a Change in Control, to direct the Trustee to purchase
any such policies or contracts, and following a Change in Control the
Independent Plan Administrator shall have the same powers regarding such
insurance policies and contracts. Any such policy or contract shall be an asset
of the Trust subject to the claims of the Company's creditors in the event of
insolvency, as specified in Sections 21.1 and 21.2 of this Trust Agreement. The
proceeds of any life insurance policy shall, upon the death of the insured, be
paid to the Trust. The Trustee shall be under no duty to question any direction
of the Company or the Independent Plan Administrator, to review the form of any
such policies or contracts or the selection of the issuer thereof, or to make
suggestions to the Company, the Independent Plan Administrator or to the issuer
thereof with respect to the form of such policies or contracts prior to a Change
in Control, or to question any such directions, to review such policies, forms
or selections or to make such suggestions to the Independent Plan Administrator
following a Change in Control. Prior to a Change in Control, the Company may
direct the Trustee to exercise the powers of the contract holder under any such
policies or contracts, and the Trustee shall exercise such powers only upon the
direction of the Company. Following a Change in Control, the Independent Plan
Administrator may direct the Trustee to exercise the powers of the contract
holder under any such policies or contracts and the

                                      14
<PAGE>
 
Trustee shall exercise such powers only upon direction of the Independent Plan
Administrator. Notwithstanding anything to the contrary contained in any
Participating Plan, the Trustee (i) shall be fully protected in acting in
accordance with written directions of the Company prior to a Change in Control
and with the written directions of the Independent Plan Administrator following
a Change in Control, and (ii) shall be under no liability for any loss of any
kind that may result by reason of any action taken or omitted by it in
accordance with such direction of the Company or the Independent Plan
Administrator, or by reason of inaction in the absence of such written
directions from the Company or the Independent Plan Administrator. No insurance
carrier shall for any purpose be deemed a party to this Trust Agreement or be
responsible for the validity or sufficiency hereof. Notwithstanding the fact
that it may have knowledge of the terms of this Trust, the obligations of such
insurance carrier shall be measured and determined solely by the terms and
conditions of the policies or contracts issued by it. Any such insurance carrier
shall not be under any obligation to any person, partnership, corporation, trust
or association other than as stated in such policies or contracts.


                                  SECTION 10

                          PARTICIPATING PLAN RECORDS

     A separate written record of the accrued and vested benefit, as applicable,
for each Trust Beneficiary of each Participating Plan, based on a certified
listing provided by the Company prior to a Change in Control and by the
Independent Plan Administrator following a Change in Control, shall be
maintained. The Company or the Independent Plan Administrator, as applicable,
shall provide such certified listing at least once each calendar year to the
Trustee.


                                  SECTION 11

                                   VALUATION

     The Trust shall be revalued by the Trustee at current values, as determined
by the Trustee, as of the last business day of each calendar year and as of such
additional dates as the Trustee and Company shall determine to be appropriate
("Valuation"). The Company prior to a Change in Control and the Independent Plan
Administrator following a Change in Control annually shall provide a
certification of value for each life insurance, retirement income or annuity
policy or contract held as an asset of the

                                      15
<PAGE>
 
Trust. The Trustee may rely upon the certification of value received from the
Company prior to a Change in Control or the Independent Plan Administrator
following a Change in Control for each such policy or contract held as an asset
of the Trust.

                                  SECTION 12

        PARTICIPANT RECORDS PRIOR TO AND FOLLOWING A CHANGE IN CONTROL

     Section 12.1.  In addition to the records maintained under Section 10, the
     -------------                                                             
Company shall maintain a separate written record that reflects for each Trust
Beneficiary, the Trust Beneficiary's vested benefits under each Participating
Plan and the portion of the Trust or Subtrust allocated to such Trust
Beneficiary (a "Participant Record").  Prior to a Change in Control, the Trustee
shall certify to the Company the results of each Valuation. Following receipt of
a Valuation, each Participant Record shall be equitably adjusted by the Company
to reflect its share of the income, expense, appreciation and depreciation since
the preceding Valuation date.  Such Participant Records shall be maintained
solely for record keeping purposes prior to a Change in Control, without any
legal entitlement of a Trust Beneficiary to amounts allocated to his or her
Participant Record.

     Section 12.2.  On and after a Change in Control, the Independent Plan
     -------------                                                        
Administrator (i) shall continue to maintain the Participant Records and the
records described in Section 10 of this Trust Agreement, (ii) shall thereafter
be solely responsible for the updating of such Participant Records and for
requesting the Trustee to make any additional Valuations the Trustee and
Independent Plan Administrator deem appropriate, and (iii) shall be entitled to
rely on the most recent certified listing delivered by the Company to the
Trustee prior to a Change in Control in the maintenance and updating of such
Participant Records following a Change in Control. No new Participant Records
may be established following a Change in Control.  The Independent Plan
Administrator may, but is not required to, rely on any certified listing
provided by the Company pursuant to Section 10 following a Change in Control.
Following a Change in Control, the sole source of Trust assets from which the
Independent Plan Administrator may direct that a Trust Beneficiary's
Supplemental Benefits be paid to the extent the Trustee, rather than the
Company, pays the Supplemental Benefits shall be that portion of the assets of
the Trust or Subtrust allocated to the Participant Record of such Trust
Beneficiary.

                                      16
<PAGE>
 
                                  SECTION 13

                               TRUSTEE ACCOUNTS

     Within 120 days after the close of each fiscal year of the Trust and any
other period agreed upon by the Trustee and the Company, and within ninety (90)
days of the date of the removal or resignation of the Trustee, the Trustee shall
file with the Company a written account ("Trustee Account") setting forth all
investments, receipts, disbursements, withdrawals and other transactions
effected by it during the period from the date of its last such Trustee Account
and a list of the assets of the Trust at the close of such period. Such Trustee
Account may be in the form of monthly or quarterly statements which taken
together reflect the matters set forth in the preceding sentence. As between the
Company and the Trustee, the Trustee shall be forever released and discharged
from all liability with respect to the propriety of acts and transactions shown
in such Trustee Account following a Change in Control, and shall be forever
released and discharged from all liability with respect to the propriety of acts
and transactions shown in such Trustee Account prior to a Change in Control
except with respect to any such act or transaction as to which the Company
shall, within a 90-day period of receipt of the Trust Account, file written
objections with the Trustee and except that no such accounting shall foreclose
any liability of the Trustee to the Company arising under Section 23.3 of this
Trust Agreement.


                                  SECTION 14

                              INVESTMENT OF CASH

     Prior to a Change in Control, the Trustee shall keep any cash held
hereunder from time to time on deposit in its own banking department or
elsewhere as the Trustee elects, consistent with instructions provided by the
Investment Officer of the Company regarding specific types of permissible
investments and permissible depositories. Prior to a Change in Control, in the
absence of contrary instructions from the Investment Officer, and following a
Change in Control, in the absence of contrary instructions from the Independent
Plan Administrator regarding insurance, retirement income or annuity policies or
contracts, and anything herein to the contrary notwithstanding, the Trustee,
without obtaining any prior approvals, may at its discretion invest cash
balances held by the Trustee from time to time in deposits in its own banking
department, in short-term cash

                                      17
<PAGE>
 
equivalents having ready marketability, including but not limited to U.S.
Treasury bills, commercial paper rated not less than A1/P1 (including such forms
thereof as may be available through the Trustee's own trust department),
certificates of deposit, and similar type securities, having a maturity of 18
months or less, including participation in common or collective funds composed
thereof. Prior to a Change in Control, the Trustee may sell any such short-term
investments as may be necessary to carry out the instructions of the Investment
Officer of the Company regarding more permanent type investments or to permit
any distributions or transfers directed hereunder. The Trustee may make any such
sales it deems appropriate following a Change in Control, including sales
necessary to carry out the instructions of the Independent Plan Administrator.


                                  SECTION 15

                            PAYMENTS BY THE TRUSTEE

     Section 15.1.  The establishment of the Trust and the payment or delivery 
     ------------                                                               
to the Trustee of money or other property acceptable to the Trustee shall not
vest in any Trust Beneficiary any right, title or interest in or to any assets
of the Trust.

     Section 15.2.  The Trustee shall be directed as to the amount, timing, and
     ------------            
form of benefits to be paid to any Trust Beneficiary. Prior to a Change in
Control, the Company shall so direct the Trustee and by giving such directions
shall be deemed to warrant their propriety. Following a Change in Control, the
Independent Plan Administrator shall so direct the Trustee and by giving such
directions, shall be deemed to warrant their propriety.

     Section 15.3.  The Trustee shall withhold all or any part of any payment 
     ------------                                                               
for the payment of any tax liability and the Trustee shall discharge such
liability as and when directed by the Company prior to a Change in Control and
by the Independent Plan Administrator following a Change in Control. All
withholding, related filings and reports are the responsibility of the Company.

     Section 15.4.  The Company intends to make benefit payments from its asset
     ------------               
as it deems appropriate, in its sole discretion, provided, that, notwithstanding
this intent, if the Trust is not sufficient, before or after a Change in
Control, to make one or more payments of Supplemental Benefits to the Trust
Beneficiaries under the relevant Participating Plan, the Company shall make the
balance of each such payment as it falls due.

                                      18
<PAGE>
 
     Section 15.5.  Except as otherwise provided herein, in the event of any 
     ------------   
final determination by the Internal Revenue Service or a court of competent
jurisdiction which determination is not appealable or the time for appeal or
protest of which has expired, or the receipt by the Trustee of an unqualified
opinion of tax counsel selected by the Trustee or Company, which determination
determines, or which opinion concludes, that any Trust Beneficiary is subject to
federal income taxation on amounts held in trust to pay Supplemental Benefits
hereunder prior to the distribution to the Trust Beneficiary of such
Supplemental Benefits, the Trustee shall, on receipt by the Trustee of such
opinion or actual notice of such determination, pay to such Trust Beneficiary
the portion of the Trust corpus includible in such Trust Beneficiary's federal
gross income, and the Trust Beneficiary's Supplemental Benefits shall be
canceled to the extent of such payment, provided that the amount, form and
timing of such payments and the amount and method of such cancellation shall be
as directed by the Company prior to a Change in Control and by the Independent
Plan Administrator following a Change in Control.


                                  SECTION 16

                      DETERMINATION OF CHANGE IN CONTROL

     The Company shall immediately notify the Trustee in writing of the
occurrence of a Change in Control as the result of any event specified in
Section 3.1 of this Trust Agreement. If the Trust Department of the Trustee
receives written notice from a third party (including the Company's outside
auditors) of the alleged occurrence of a Change in Control as the result of any
event specified in Section 3.1 of this Trust Agreement, the Trustee shall
request the Company to confirm or deny such occurrence and the Company shall
make such confirmation or denial within forty-five (45) days following receipt
of the Trustee's request. In order to deny that a Change in Control as the
result of any event specified in Section 3.1 of this Trust Agreement has
occurred, the Company shall provide with its notice a certificate, in a form
reasonably satisfactory to the Trustee, from an independent accounting firm,
which firm may be the accounting firm engaged by the Company to be its outside
auditors, certifying that a Change in Control as the result of an event
specified in Section 3.1 of this Trust Agreement has not occurred. Pending the
Company's response, the Trustee shall not repay, pursuant to Section 5 of this
Trust Agreement, any assets of the Trust to the Company and no new Trust
Beneficiaries may be added to the Trust. The Trustee shall be entitled to
conclusively rely upon such confirmation or denial.

                                      19
<PAGE>
 
                                  SECTION 17

                    TRUSTEE COMPENSATION AND TRUST EXPENSES

     The Trustee shall be paid such reasonable compensation for its service as
Trustee as shall from time to time be agreed upon by Company and Trustee. This
compensation and all expenses incurred by the Trustee in the management and
protection of the Trust, including administration, accounting and legal fees,
shall be reimbursed by the Company within 30 days after the Company's receipt of
a bill from the Trustee for any fees and expenses paid from the Trust assets. To
the extent the Company fails to reimburse the Trustee, this compensation and
extraordinary and non-recurring expenses shall be charged by the Trustee against
the Trust.

                                  SECTION 18

                          PAYMENT OF TAXES BY TRUSTEE

     Prior to a Change in Control, to the extent that any taxes levied or
assessed upon the Trust are not paid by the Company, the Trustee shall pay such
taxes out of the Trust as directed by the Company. The Trustee shall, if
requested by the Company prior to a Change in Control, and solely in its
discretion following a Change in Control, contest the validity or amount of any
tax assessment, claim or demand respecting the Trust or any part thereof. The
Company itself may contest the validity of any such taxes prior to a Change in
Control.

                                  SECTION 19

                             CUSTODIANS AND AGENTS

     When so instructed by the Company prior to a Change in Control with respect
to Trust assets for which the Company has investment responsibility, and at the
Trustee's sole discretion with respect to assets for which the Trustee has
investment responsibility, the Trustee shall deposit any assets held by it with
a custodian, which may not include the Company or an affiliate of the Company,
and the Company shall hold harmless and defend the Trustee against any liability
arising or asserted to arise out of the Trustee's compliance with directions
under this Section 19 of this Trust Agreement.

                                      20
<PAGE>
 
                                  SECTION 20

                        LIABILITY FOR BENEFIT PAYMENTS

     The Company shall remain primarily liable to pay Supplemental Benefits
under the Participating Plans. However, the Company's liability under the
Participating Plans shall be reduced or offset to the extent Supplemental
Benefit payments are made from the Trust.

                                  SECTION 21

                              COMPANY INSOLVENCY

     Section 21.1.  The Company shall have the duty to inform the Trustee in
     ------------                                                          
writing if the Company becomes insolvent, as hereinafter defined.  When so
informed, the Trustee shall immediately discontinue payments of Supplemental
Benefits to Trust Beneficiaries, and shall hold the assets of the Trust for the
benefit of the Company's general creditors.  The Company shall be considered
"insolvent" for purposes of this Trust Agreement in the event of the following:

     A.   the Company's inability to pay debts as they mature;

     B.   a general assignment for the benefit of the Company's creditors;

     C.   the voluntary commencement by the Company of any proceeding under
     Title 11 of the United States Code or any other law of any jurisdiction for
     the relief, liquidation or rehabilitation of debtors (all of which
     proceedings are hereinafter collectively referred to as "Insolvency
     Proceedings");

     D.   the making of an admission by the Company of any of the material
     allegations of, or consenting to, or acquiescing in, a petition,
     application, motion or complaint commencing an Insolvency Proceeding or the
     seeking by the Company of the appointment of, or the taking of possession
     by, a receiver, custodian, trustee, liquidator or similar official of or
     for it or for a substantial part of its assets;

     E.   the involuntary commencement of an Insolvency Proceeding against the
     Company which is not fully stayed, timely controverted or dismissed within
     one hundred twenty (120) days after the filing thereof; or

                                      21
<PAGE>
 
     F.   the appointment of, or the taking of possession by, a receiver,
     custodian, trustee, liquidator or similar official of or for the Company or
     of or for all or substantially all of its assets.

     If the Trust Department of the Trustee receives a written allegation from a
third party that the Company has become insolvent, the Trustee shall appoint an
independent accounting firm to determine within sixty (60) days whether the
Company is insolvent under the terms of this Trust Agreement and, pending such
determination, the Trustee shall discontinue payments of Supplemental Benefits
to Trust Beneficiaries, shall hold the Trust assets for the benefit of the
Company's general creditors, and shall resume payments of Supplemental Benefits
to Trust Beneficiaries only after such independent accounting firm, has
determined that the Company is not insolvent (or is no longer insolvent,
assuming the independent accounting firm initially determined the Company to be
insolvent) or after receipt of an order of a court of competent jurisdiction. In
making its determination, such independent accounting firm, may rely on a letter
from the Company's Controller, or its Independent Auditors, or on relevant
information concerning the Company's solvency which has been furnished to the
Trustee by any other person. Notwithstanding any other provision of this Trust
Agreement, the Trustee shall be responsible only for the prudent selection of
the independent accounting firm, and shall conclusively rely on such firm's
determination. Nothing in this Trust Agreement shall in any way enlarge or
diminish the rights of the Trust Beneficiaries in the event the Company is
insolvent to pursue their rights as general creditors of the Company with
respect to their Supplemental Benefits or otherwise.

     Section 21.2.  In the case of the Company's notification of insolvency or 
     ------------   
the determination of insolvency by an independent accounting firm as provided in
Section 21.1 of this Trust Agreement, the Trustee shall deliver any
undistributed principal and income in the Trust to satisfy claims of the
Company's general creditors as directed by a court of competent jurisdiction.

     Section 21.3.  If the Trustee discontinues payments of Supplemental 
     ------------                                                               
Benefits from the Trust pursuant to Section 21.1 of this Trust Agreement and
subsequently resumes such payments, the first payment to each Trust Beneficiary
following such discontinuance shall include the aggregate amount of all payments
which would have been made to such Trust Beneficiary in accordance with the
relevant Participating Plan during the period of such discontinuance, less the
aggregate amount of payments of Supplemental Benefits made to such Trust
Beneficiary by the

                                      22
<PAGE>
 
Company during any such period of discontinuance. Prior to a Change in Control,
the Trustee shall be directed as to the amount, timing, form and payee of all
such payments by the Company. Following a Change in Control, the Trustee shall
be so directed by the Independent Plan Administrator.

                                  SECTION 22

                TRUSTEE RESPONSIBILITY FOR PLAN ADMINISTRATION
               AND TRUST RECORD KEEPING AFTER CHANGE IN CONTROL

     Section 22.1.  Following a Change in Control, the Independent Plan
     ------------                                                     
Administrator shall assume full responsibility for the interpretation and
application of the Participating Plans' provisions and authorization for the
payment of benefits as such provisions relate to payments to be made from the
Trust. The Independent Plan Administrator shall have full discretion with
respect to the performance of such duties and shall not be required to follow
any direction of the Company, any successor thereto, or any other entity in
performing such duties.

     Section 22.2.  Following a Change in Control, the Trustee shall maintain 
     ------------                                                               
all records dealing with the Trust and its investments; provided, however, that
the responsibility for the maintenance of Plan records relating to Trust
Beneficiaries, Participant Records and all other plan administration shall be
the sole responsibility of the Independent Plan Administrator. The Trustee shall
have no responsibility for the maintenance of the Participating Plan.

                                  SECTION 23

                       TRUSTEE STANDARDS OF PERFORMANCE
                             AND INDEMNIFICATIONS

     Section 23.1.  Trustee shall perform all of its functions hereunder (i) 
     ------------                                                               
with the care, skill, prudence, and diligence which under the circumstances then
prevailing a prudent man acting in a like capacity and familiar with such
matters would use in the conduct of an enterprise of a like character and with
like aims, or (ii) in accordance with such other standard as may be required
from time to time by law, and shall not be liable for any conduct on its part
(including reliance on advice of counsel) which conforms to that standard.

     Section 23.2.  The Company (which has the authority to do so under the laws
     ------------   
of its state of incorporation) shall indemnify the Trustee and defend it and
hold it harmless from and against any

                                      23
<PAGE>
 
and all direct liabilities, losses, claims, suits or expenses (including
attorney's fees) of whatsoever kind and nature which may be imposed upon,
asserted against or incurred by the Trustee at any time by reason of its
carrying out its responsibilities or providing services hereunder or by reason
of any act or failure to act under this Trust Agreement, except to the extent
that any such liability, loss, claim, suit or expense arises directly from the
Trustee's gross negligence or willful misconduct in the performance of
responsibilities specifically allocated to it under this Trust Agreement. The
provisions of this Section 23.2 shall survive the termination of this Trust
Agreement.

     Section 23.3.  The Trustee (which has the authority to do so under the laws
     ------------                                                 
of its state of incorporation) shall indemnify the Company and defend it and
hold it harmless from and against any and all direct liabilities, losses,
claims, suits or expenses (including attorney's fees) of whatsoever kind and
nature which may be imposed upon, asserted against or incurred by the Company at
any time directly by reason of the Trustee's gross negligence or willful
misconduct in the performance of responsibilities specifically allocated to it
under this Trust Agreement. The provisions of this Section 23.3 shall survive
the termination of this Trust Agreement.

                                  SECTION 24

                      REMOVAL AND RESIGNATION OF TRUSTEE

     Prior to a Change in Control, Trustee may be removed by the Company at any
time upon not less than thirty (30) days' written notice. The Trustee may resign
at any time prior to or following a Change in Control, upon not less than ninety
(90) days' written notice. In either case, such notice may be wholly or
partially waived by the party to whom it is due. Upon Trustee's removal or
resignation prior to a Change in Control, the Company shall appoint a successor
Trustee, who shall have no responsibility for the acts or omissions of any
predecessor trustee, and upon the Trustee's resignation following a Change in
Control the Trustee shall petition a court of competent jurisdiction to name a
successor trustee which in no event may be the Company or an affiliate of the
Company or a successor thereto; provided, however, that the successor trustee in
either case shall have the same powers and duties as those conferred upon the
Trustee hereunder, and upon acceptance of such appointment by the successor
Trustee, the Trustee shall assign, transfer and pay over to such successor
Trustee the Trusts and properties then constituting the Trust. If the Company
fails within a reasonable time to name a successor Trustee or otherwise direct
proper

                                      24
<PAGE>
 
disbursement of the Trust prior to a Change in Control, the Trustee may apply to
any court of competent jurisdiction for appropriate relief. The Trustee may in
any event reserve such reasonable sum of money as it may deem advisable, to
provide for any charges against the Trust for which it may be liable, and for
payment of its fees and expenses in connection with the settlement of its
account or otherwise. Any balance of such reserve remaining after the payment of
such fees and expenses shall be paid over as aforesaid.


                                  SECTION 25

                  TERMINATION OF PARTICIPATING PLAN OR PLANS

     If a Participating Plan is wholly or partially terminated prior to a Change
in Control, the Trustee shall disburse the portion of the Trust affected by the
termination as directed by the Company. If a Participating Plan is wholly or
partially terminated following a Change in Control, Trustee shall disburse the
portion of the Trust affected by the termination as directed by the Independent
Plan Administrator.

                                  SECTION 26

                       RIGHTS OF COMPANY TO TRUST ASSETS

     Section 26.1.  Prior to a Change in Control, the Company shall have no 
     ------------                                                               
right, title or interest in the Trust, nor shall any part of the Trust revert to
or be repaid to the Company, until all benefits due under all Participating
Plans have been paid pursuant to Section 25 of this Trust Agreement, unless, at
any time, there is a determination that the assets of the Trust have a value
exceeding one hundred twenty-five percent (125%) of the lump sum actuarial
equivalent value of accrued but unpaid benefits under the Participating Plans
pursuant to Section 5 of this Trust Agreement. The amount of such excess may be
repaid to the Company, upon direction of the Company pursuant to the provisions
of Section 5.

     Section 26.2.  On and after the occurrence of a Change in Control, the 
     ------------     
Company shall have no right, title or interest in the Trust, nor shall any part
of the Trust revert to or be repaid to the Company.

                                      25
<PAGE>
 
                                  SECTION 27

                              AMENDMENTS OF TRUST

     Section 27.1.  Prior to a Change in Control, the Company may amend this 
     ------------    
Trust Agreement by an instrument in writing signed by an authorized officer of
the Company provided that no such amendment shall make this Trust revocable or
divert any part of the Trust to purposes other than payment of Supplemental
Benefits, payments under Sections 2 or 5 of this Trust Agreement, or defrayal of
reasonable expenses of administering the Participating Plans. The Trustee's
consent shall be required for any amendment affecting its duties,
responsibilities or rights. No amendment affecting the duties, responsibilities
or rights of the Trustee shall take effect until thirty (30) days after a copy
of said amendment is furnished to the Trustee or, if the Trustee gives notice of
resignation within such 30 day period, until the resignation becomes effective,
provided, that the Trustee may, in writing, waive the 30 day requirement.

     Section 27.2.  Following a Change in Control, this Trust Agreement may not
     ------------   
be amended.

                                  SECTION 28

                             TERMINATION OF TRUST

     Section 28.1.  Prior to a Change in Control, the Company may not terminate
this Trust for reasons other than those provided in (A) and (B) below.
Otherwise, this Trust shall be irrevocable. Removal or resignation of a Trustee
pursuant to Section 24 shall not be deemed a termination of this Trust
Agreement.

     A.   This Trust will terminate if a federal court determines, after
     exhaustion of all appeals, that the Trust causes any of the Participating
     Plans to cease to be "unfunded" under the provisions of ERISA.

     B.   The Company may terminate this Trust if the Company determines, based
     on advice of legal counsel satisfactory to the Trustee, that there is a
     significant risk that the Trust would cause any of the Participating Plans
     to be cease to be unfunded under ERISA prior to actual payment of any
     Supplemental Benefits. For purposes of this section, "significant risk"
     shall be based on (i) judicial authority or opinion of the U.S. Department
     of Labor, Treasury Department or Internal Revenue Service or (ii) a
     required 

                                      26
<PAGE>
 
     amendment under ERISA or the Internal Revenue Code, which failure to amend
     could result in significant penalty to the Company.

     If this Trust Agreement is terminated under (A) or (B), the Trust assets
shall be distributed, in accordance with the Company's written direction, as
follows:

     (i)  If the Company determines it is possible to create a new trust which
     does not result in a Trust Beneficiary's constructive receipt of
     Supplemental Benefits under any Participating Plan or which will retain the
     Participating Plan's status as "unfunded" under ERISA, Trust assets shall
     be transferred to the new trust. The terms of the new trust shall be
     similar in all other respects to this Trust.

     (ii) If the Company determines that it is not possible to create a new
     trust, then the assets shall be distributed according to the allocation to
     the Trust Beneficiaries under Section 12.1.

     When all payments which have or may become payable pursuant to the terms of
this Trust have been made or the Trust has been exhausted pursuant to a
termination of this Trust Agreement under (A) or (B) above prior to a Change in
Control, the Trustee shall pay all remaining assets to the Company upon the
Company's certification of payments, subject to the Trustee's right to reserve
such amounts it reasonably determines to be necessary to pay outstanding and
accrued charges against the Trust.

     Section 28.2.  On and after the occurrence of a Change in Control, the
     ------------                                                         
Independent Plan Administrator may in its discretion direct the Trustee to
terminate this Trust Agreement and in conjunction therewith the Independent Plan
Administrator shall direct the Trustee as to the names of the Trust
Beneficiaries who are to receive payments and the time, amount and form of
payment of Supplemental Benefits and any remaining assets of the Trust, subject
to the Trustee's right to reserve such amounts the Trustee determines necessary
for outstanding and accrued charges against the Trust.

                                  SECTION 29

                                  SUCCESSORS

     Any successor in interest to the Trustee shall automatically become Trustee
under this Trust Agreement.

                                      27
<PAGE>
 
                                  SECTION 30

                                COMMUNICATIONS

     Any communications (including notices, instructions, or directions)
required or permitted hereunder to be given by the Company shall be given in
writing addressed to the Trustee and signed by an officer of the Company or
other person or persons whom the Company notifies the Trustee are from time to
time authorized to sign such communications, and the Company warrants that all
communications given pursuant to this Section 30 may be relied upon by the
Trustee. The Company shall furnish the Trustee specimen signatures of all
persons authorized to sign communications to the Trustee.

                                  SECTION 31

                            UNCLAIMED DISTRIBUTIONS

     If any benefit payment mailed by regular U.S. Mail to the last address of
the payee furnished by the Company is returned unclaimed, the Trustee shall so
notify the Company and shall discontinue further payments to such payee until it
receives further instructions of the Company.

                                  SECTION 32

                          PROHIBITION OF ASSIGNMENTS

     Except insofar as applicable law may otherwise require and subject to
Sections 1, 2, 21.1 and 21.2 of this Trust Agreement, (i) no amount payable to
or in respect of any Trust Beneficiary at any time under the Trust shall be
subject in any manner to direction by anticipation, sale, transfer, assignment,
bankruptcy, pledge, attachment, or charge of any kind, and any attempt to so
alienate, sell, transfer, assign, pledge, attach, change or otherwise encumber
any such amount, whether presently or thereafter payable, shall be void and (ii)
the Trust shall in no manner be liable for or subject to the debts or
liabilities of any Trust Beneficiary. No amount held under this Trust Agreement
shall be subject to voluntary or involuntary alienation.

                                      28
<PAGE>
 
                                  SECTION 33

                                 GOVERNING LAW

     This Trust Agreement shall be governed by and construed under the laws of
the State of Massachusetts in all respects.

                                  SECTION 34

                                   EXECUTION

     This Trust Agreement may be executed in counterparts, each of which shall
be an original although the others are not produced.



     IN WITNESS WHEREOF, the parties have caused this Trust Agreement to be
executed as of the date first written above.

ATTEST:                            LYONDELL PETROCHEMICAL COMPANY

____________________________       By:____________________________________
Assistant Secretary                   Richard W. Park
                                      Vice President, Human Resources

ATTEST:                            STATE STREET BANK AND TRUST     
                                   COMPANY

____________________________       By:____________________________________

                                      29
<PAGE>
 
                                  APPENDIX A
                                      TO
                        LYONDELL PETROCHEMICAL COMPANY
                     SUPPLEMENTAL EXECUTIVE BENEFIT PLANS
                                TRUST AGREEMENT


Lyondell Petrochemical Company Supplementary Executive Retirement Plan

Lyondell Petrochemical Company Executive Deferral Plan

                                      30

<PAGE>
 
                                                                 EXHIBIT 10.8(a)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

                     SUPPLEMENTAL EXECUTIVE BENEFIT PLANS

                                TRUST AGREEMENT


Lyondell Petrochemical Company hereby amends, effective August 1, 1997, the
Lyondell Petrochemical Company Supplemental Executive Benefit Plans Trust
Agreement, as follows:

Section 3, CHANGE IN CONTROL, Section 3.2., "Definition of Change in Control" is
revised in its entirety to read as follows:

          SECTION 3.2.  Definition of "Change in Control". A "Change in Control"
          -----------
shall be deemed to have occurred as of the date that one or more of the
following occurs:

     A.   Individuals who, as of the date hereof, constitute the entire Board of
     Directors of the Company ("Incumbent Directors") cease for any reason to
     constitute at least a majority of the Board; provided, however, that any
                                                  --------  -------          
     individual becoming a director subsequent to the date hereof whose
     election, or nomination for election by the Company's shareholders, was
     approved by a vote of at least a majority of the then Incumbent Directors
     shall be considered as though such individual was an Incumbent Director,
     but excluding, for this purpose any such individual whose initial
     assumption of office occurs as a result of either an actual or threatened
     election contest, as such terms are used in Rule 14a-11 under the Exchange
     Act or other actual or threatened solicitation of proxies or consents by or
     on behalf of any Person (as defined below) other than the Board; provided,
                                                                      -------- 
     further, that in the event ARCO at any time determines to achieve minority
     -------                                                                   
     representation on the Company's Board of 
<PAGE>
 
     Directors approximately equal to its then ownership percentage of the
     Company's common stock, its implementation of such determination through
     the election of ARCO employees as directors of the Company shall not be
     deemed to be a Change in Control and such ARCO employees shall constitute
     Incumbent Directors;

     B.   The stockholders of the Company shall approve (I) any merger,
     consolidation or recapitalization of the Company (or, if the capital stock
     of the Company is affected, any subsidiary of the Company), or any sale,
     lease, or other transfer (in one transaction or a series of transactions
     contemplated or arranged by any party as a single plan) of all or
     substantially all of the assets of the Company (each of the foregoing being
     an "Acquisition Transaction") where (i) the shareholders of the Company
     immediately prior to such Acquisition Transaction would not immediately
     after such Acquisition Transaction beneficially own, directly or
     indirectly, shares or other ownership interests representing in the
     aggregate eighty percent (80%) or more of (a) the then outstanding common
     stock or other equity interests of the corporation or other entity
     surviving or resulting from such merger, consolidation or recapitalization
     or acquiring such assets of the Company, as the case may be (the "Surviving
     Entity") (or of its ultimate parent corporation or other entity, if any),
     and (b) the Combined Voting Power of the then outstanding Voting Securities
     of the Surviving Entity (or of its ultimate parent corporation or other
     entity, if any) or (ii) the Incumbent Directors at the time of the initial
     approval of such Acquisition Transaction would not immediately after such
     Acquisition Transaction constitute a majority of the Board of Directors, or
     similar managing group, of the Surviving Entity (or of its ultimate parent
     corporation or other entity, if any), or (2) any plan or proposal for the
     liquidation or dissolution of the Company;

     C.   Any Person except for ARCO shall be or become the beneficial owner (as
     defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
     indirectly, of securities of the Company representing in the aggregate more
     than twenty percent (20%) of either (A) the then outstanding shares of
     common stock of the Company ("Common Shares") or (B) the Combined Voting
     Power of all then outstanding Voting Securities of the Company; provided,
                                                                     -------- 
     however, that notwithstanding the foregoing, a "Change of Control" shall
     -------                                                                 
     not be deemed to have occurred for purposes of this Subsection (C):

          (i)  Solely as a result of an acquisition of securities by the Company
          which, by reducing the number of Common Shares or other Voting
          Securities outstanding, increases (a) the proportionate number of
          Common Shares beneficially owned by any Person to more than twenty
          percent (20%) of the Common Shares then outstanding, or (b) the
          proportionate voting power represented by the Voting Securities
          beneficially owned by any Person to more than twenty percent (20%) of
          the Combined Voting Power of all then outstanding Voting Securities;
          or

                                       2
<PAGE>
 
          (ii) Solely as a result of an acquisition of securities directly from
          the Company except for any conversion of a security that was not
          acquired directly from the Company,

     provided, further, that if any Person referred to in paragraph (i) or (ii)
     --------  -------  
     of this Subsection (C) shall thereafter become the beneficial owner of any
     additional Common Shares or other Voting Securities of the Company (other
     than pursuant to a stock split, stock dividend or similar transaction),
     then a "Change of Control" shall be deemed to have occurred for purposes of
     this Subsection (C); or

     D.   ARCO shall become the owner, directly or indirectly, of securities of
     the Company representing in the aggregate more than fifty percent (50%) of
     either (1) the then outstanding Common Shares or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company except as
     the result of an acquisition of securities by the Company which, by
     reducing the number of Common Shares or other Voting Securities
     outstanding, increases (x) the proportionate number of Common Shares
     beneficially owned by ARCO to more than fifty percent (50%) of the Common
     Shares then outstanding, or (y) the proportionate voting power represented
     by the Voting Securities beneficially owned by ARCO to more than fifty
     percent (50%) of the Combined Voting Power of all then outstanding Voting
     Securities; provided, however, that if thereafter ARCO becomes the
                 --------  -------                                     
     beneficial owner of any additional Common Shares or other Voting Securities
     of the Company (other than pursuant to a stock split, stock dividend or
     similar transaction) the exception provided above shall no longer apply;
     provided, further, that for purposes of this Subsection (D), neither record
     --------  -------                                                          
     ownership of common stock of the Company by the Trustee for ARCO's 401(a)
     qualified plans nor beneficial ownership of common stock of the Company by
     any of ARCO's directors for their personal account shall be deemed to
     constitute "indirect" ownership of common stock of the Company by ARCO;
     provided, further, that notwithstanding any contrary provision of this
     --------  -------                                                     
     Agreement, no Change in Control shall be deemed to have occurred pursuant
     to this Subsection (D) if as a result of an inadvertent act ARCO becomes
     the owner, directly or indirectly, of additional Common Shares or Voting
     Securities and such securities are sold or otherwise disposed of by ARCO
     within 30 days after ARCO discovers, or is notified by the Company as to,
     the potential Change of Control resulting from such ownership, so that, as
     a result of such subsequent sale or other disposition by ARCO, no Change in
     Control would otherwise be deemed to have occurred pursuant to the terms
     (excluding this proviso) of this Subsection (D).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
     to have occurred as a result solely of (1) the registration by ARCO of the
     Exchangeable Notes pursuant to the Registration Statement, (2) the issuance

                                       3
<PAGE>
 
     and sale by ARCO of the Exchangeable Notes to the underwriters in
     accordance with the Registration Statement, (3) prior to the maturity of
     the Exchangeable Notes, purchases and sales of the Exchangeable Notes, or
     (4) a transaction in which assets of the Company are contributed to an
     entity pursuant to the creation of a partnership under the terms of certain
     agreements authorized by the Incumbent Directors on July 25, 1997.


IN WITNESS WHEREOF, the undersigned, being duly authorized on behalf of the
Company, has executed this instrument on this __________ day of August, 1997.



ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY



BY: ________________________            BY:___________________________
    Assistant Secretary                       Richard W. Park
                                              Vice President, Human Resources

                                       4

<PAGE>
 
                                                               EXHIBIT 10.9 (B)

                              INSTRUMENT AMENDING

                             RESTRICTED STOCK PLAN

                                      OF

                        LYONDELL PETROCHEMICAL COMPANY
                                        


LYONDELL PETROCHEMICAL COMPANY  hereby amends the Restricted Stock Plan of
Lyondell Petrochemical Company, effective August 1, 1997, as follows:


Section 5, Terms and Conditions of Restricted Shares, subsection (e)(iii),
           -----------------------------------------                      
Change of Control, is amended to read as follows:



Section 5  Terms and Conditions of Restricted Shares
           -----------------------------------------

          (e)  (iii)  "Change in Control means a change in control as defined in
                      the Company's Supplemental Executive Benefit Plans Trust
                      Agreement.



IN WITNESS WHEREOF, LYONDELL PETROCHEMICAL COMPANY, acting by and through its
duly authorized officer, has caused this Instrument to be executed on August
___,1997.

ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY

By:__________________________           By:________________________________
     Assistant Secretary                     Richard W. Park
                                             Vice President, Human Resources

<PAGE>
 
                                                                Exhibit 10.11(b)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

               ELECTIVE DEFERRAL PLAN FOR NON-EMPLOYEE DIRECTORS
                                        

LYONDELL PETROCHEMICAL COMPANY hereby amends the Lyondell Petrochemical Company
Elective Deferral Plan for Non-Employee Directors, effective August 1, 1997, to
read as follows:

SECTION 1.3.  DEFINITIONS, Subsection (f), Change in Control, is amended to read
as follows:

     (f)  Change in Control shall be deemed to have occurred as of the date that
one or more of the following occurs:

          (i)  Individuals who, as of the date hereof, constitute the entire
     Board of Directors of the Company ("Incumbent Directors") cease for any
     reason to constitute at least a majority of the Board; provided, however,
                                                            --------  ------- 
     that any individual becoming a director subsequent to the date hereof whose
     election, or nomination for election by the Company's shareholders, was
     approved by a vote of at least a majority of the then Incumbent Directors
     shall be considered as though such individual was an Incumbent Director,
     but excluding, for this purpose any such individual whose initial
     assumption of office occurs as a result of either an actual or threatened
     election contest, as such terms are used in Rule 14a-11 under the Exchange
     Act or other actual or threatened solicitation of proxies or consents by or
     on behalf of any Person (as defined below) other than the Board; provided,
                                                                      -------- 
     further, that in the event ARCO at any time determines to achieve minority
     -------                                                                   
     representation on the Company's Board of Directors approximately equal to
     its then ownership percentage of the Company's common stock, its
     implementation of such determination through the election of ARCO employees
     as directors of the Company shall not be deemed to be a Change in Control
     and such ARCO employees shall constitute Incumbent Directors;

          (ii) The stockholders of the Company shall approve (A) any merger,
     consolidation or recapitalization of the Company (or, if the capital stock
     of the Company is affected, any subsidiary of the Company), or any sale,
     lease, or other 
<PAGE>
 
     transfer (in one transaction or a series of transactions contemplated or
     arranged by any party as a single plan) of all or substantially all of the
     assets of the Company (each of the foregoing being an "Acquisition
     Transaction") where (1) the shareholders of the Company immediately prior
     to such Acquisition Transaction would not immediately after such
     Acquisition Transaction beneficially own, directly or indirectly, shares or
     other ownership interests representing in the aggregate eighty percent
     (80%) or more of (a) the then outstanding common stock or other equity
     interests of the corporation or other entity surviving or resulting from
     such merger, consolidation or recapitalization or acquiring such assets of
     the Company, as the case may be (the "Surviving Entity") (or of its
     ultimate parent corporation or other entity, if any), and (b) the Combined
     Voting Power of the then outstanding Voting Securities of the Surviving
     Entity (or of its ultimate parent corporation or other entity, if any) or
     (2) the Incumbent Directors at the time of the initial approval of such
     Acquisition Transaction would not immediately after such Acquisition
     Transaction constitute a majority of the Board of Directors, or similar
     managing group, of the Surviving Entity (or of its ultimate parent
     corporation or other entity, if any), or (B) any plan or proposal for the
     liquidation or dissolution of the Company;

          (iii) Any Person except for ARCO shall be or become the beneficial
     owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act),
     directly or indirectly, of securities of the Company representing in the
     aggregate more than twenty percent (20%) of either (A) the then outstanding
     shares of common stock of the Company ("Common Shares") or (B) the Combined
     Voting Power of all then outstanding Voting Securities of the Company;
     provided, however, that notwithstanding the foregoing, a "Change of
     --------  -------                                                  
     Control" shall not be deemed to have occurred for purposes of this
     Subsection (iii).

                (1) Solely as a result of an acquisition of securities by the
          Company which, by reducing the number of Common Shares or other Voting
          Securities outstanding, increases (a) the proportionate number of
          Common Shares beneficially owned by any Person to more than twenty
          percent (20%) of the Common Shares then outstanding, or (b) the
          proportionate voting power represented by the Voting Securities
          beneficially owned by any Person to more than twenty percent (20%) of
          the Combined Voting Power of all then outstanding Voting Securities;
          or

                (2) Solely as a result of an acquisition of securities directly
          from the Company except for any conversion of a security that was not
          acquired directly from the Company,

     provided, further, that if any Person referred to in paragraph (1) or (2)
     --------  ------- 
     of this Subsection (iii) shall thereafter become the beneficial owner of
     any additional Common Shares or other Voting Securities of the Company
     (other than pursuant to a stock split, stock dividend or similar
     transaction), then a "Change of Control" shall be deemed to have occurred
     for purposes of this Subsection (iii); or

                                       2
<PAGE>
 
          (iv) ARCO shall become the owner, directly or indirectly, of
     securities of the Company representing in the aggregate more than fifty
     percent (50%) of either (i) the then outstanding Common Shares or (ii) the
     Combined Voting Power of all then outstanding Voting Securities of the
     Company except as the result of an acquisition of securities by the Company
     which, by reducing the number of Common Shares or other Voting Securities
     outstanding, increases (x) the proportionate number of Common Shares
     beneficially owned by ARCO to more than fifty percent (50%) of the Common
     Shares then outstanding, or (y) the proportionate voting power represented
     by the Voting Securities beneficially owned by ARCO to more than fifty
     percent (50%) of the Combined Voting Power of all then outstanding Voting
     Securities; provided, however, that if thereafter ARCO becomes the
                 --------  -------                                     
     beneficial owner of any additional Common Shares or other Voting Securities
     of the Company (other than pursuant to a stock split, stock dividend or
     similar transaction) the exception provided above shall no longer apply;
                                                                             
     provided, further, that for purposes of this Subsection (iv, neither record
     --------  -------                                                          
     ownership of common stock of the Company by the Trustee for ARCO's 401(a)
     qualified plans nor beneficial ownership of common stock of the Company by
     any of ARCO's directors for their personal account shall be deemed to
     constitute "indirect" ownership of common stock of the Company by ARCO;
                                                                            
     provided, further, that notwithstanding any contrary provision of this
     --------  -------                                                     
     Agreement, no Change in Control shall be deemed to have occurred pursuant
     to this Subsection (iv) if as a result of an inadvertent act ARCO becomes
     the owner, directly or indirectly, of additional Common Shares or Voting
     Securities and such securities are sold or otherwise disposed of by ARCO
     within 30 days after ARCO discovers, or is notified by the Company as to,
     the potential Change of Control resulting from such ownership, so that, as
     a result of such subsequent sale or other disposition by ARCO, no Change in
     Control would otherwise be deemed to have occurred pursuant to the terms
     (excluding this proviso) of this Subsection (iv).

          Notwithstanding any of the foregoing, no Change in Control shall be
     deemed to have occurred as a result solely of (i) the registration by ARCO
     of the Exchangeable Notes pursuant to the Registration Statement, (ii) the
     issuance and sale by ARCO of the Exchangeable Notes to the underwriters in
     accordance with the Registration Statement, (iii) prior to the maturity of
     the Exchangeable Notes, purchases and sales of the Exchangeable Notes, or
     (iv) a transaction in which assets of the Company are contributed to an
     entity pursuant to the creation of a partnership under the terms of certain
     agreements authorized by the Incumbent Directors on July 25, 1997.

     (v)  For purposes of this Section 1.3:

          (1) "Affiliate" shall mean, as to a specified Person, another Person
     that directly, or indirectly through one or more intermediaries, controls
     or is controlled by, or is under common control with, the specified Person,
     within the meaning of such 

                                       3
<PAGE>
 
     terms as used in Rule 405 under the Securities Act of 1933, as amended, or
     any successor rule.

          (2) "ARCO" shall mean Atlantic Richfield Company and any of its
     Affiliates, excluding the Company.

          (3) "Combined Voting Power" shall mean the aggregate votes entitled to
     be cast generally in the election of the Board of Directors, or similar
     managing group, of a corporation or other entity by holders of then
     outstanding Voting Securities of such corporation or other entity.

          (4) "Exchangeable Notes" shall mean the debt securities exchangeable
     upon maturity, at ARCO's option, into shares of the Company's common stock
     or cash, as such debt securities are described in the Registration
     Statement.

          (5) "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
     Liability Company organized under the laws of the State of Texas.

          (6) "Person" shall mean any individual, entity (including, without
     limitation, any corporation, partnership, trust, joint venture, association
     or governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2)
     of the Exchange Act and the rules and regulations thereunder); provided,
                                                                    -------- 
     however, that Person shall not include the Company or LCR, any of their
     -------                                                                
     subsidiaries, any employee benefit plan of the Company or LCR or any of
     their majority-owned subsidiaries or any entity organized, appointed or
     established by the Company, LCR or such subsidiaries for or pursuant to the
     terms of any such plan.

          (7) "Registration Statement" shall mean ARCO's registration statement
     on Form S-3 (Registration No. 33-53481) with respect to the Exchangeable
     Notes.

                                       4
<PAGE>
 
          (8) "Voting Securities" shall mean all securities of a corporation or
     other entity having the right under ordinary circumstances to vote in an
     election of the Board of Directors, or similar managing group, of such
     corporation or other entity.


IN WITNESS WHEREOF, LYONDELL PETROCHEMICAL COMPANY, acting by and through its
duly authorized officer, has caused this Instrument to be executed on this ____
day of August, 1997.


ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY



By:________________________             By:_____________________________________
     Assistant Secretary                    Jeffrey R. Pendergraft
                                            Senior Vice President and Secretary

                                       5

<PAGE>
 
                                                                   EXHIBIT 10.12


                                   INSTRUMENT

                             AMENDING AND RESTATING

                         LYONDELL PETROCHEMICAL COMPANY

                              RETIREMENT PLAN FOR

                             NON-EMPLOYEE DIRECTORS
                                        

Lyondell Petrochemical Company hereby amends and restates the Retirement Plan
for Non-Employee Directors, effective as of November 1, 1996, to read in its
entirety as the document entitled "Lyondell Petrochemical Company Retirement
Plan for Non-Employee Directors" that is attached hereto.


IN WITNESS WHEREOF, the undersigned, being duly authorized on behalf of the
Company, has executed this Instrument on this ____ day of June, 1997.



ATTEST:                       LYONDELL PETROCHEMICAL COMPANY



BY:_______________________    BY:___________________________________
   Assistant Secretary                  Jeffrey R. Pendergraft
                                 Senior Vice President and Secretary
<PAGE>
 
LYONDELL PETROCHEMICAL COMPANY

 
________________________________________________________________________________


RETIREMENT PLAN FOR NON-EMPLOYEE DIRECTORS


AS AMENDED AND RESTATED EFFECTIVE NOVEMBER 1, 1996
<PAGE>
 
                                   ARTICLE I

                                  DEFINITIONS
                                        

1.1  Actuarial Equivalent means, in comparing benefits payable in different
forms or at different times or in different circumstances, a value under one
such set of circumstances which is the same as the value under a different set
of circumstances.  Such value shall be computed and determined with reference to
mortality assumptions, interest rates and other actuarial factors and
assumptions then in effect under the Lyondell Petrochemical Company Retirement
Plan for Non-Represented Employees for the purpose of calculating actuarial
equivalents under that Plan.

1.2  Administrative Committee means the Directors Benefit Committee.

1.3  Beneficiary means a person or persons designated by the Non-Employee
Director or Retiree to receive the Death Benefit under Article IV.

1.4  Board means the Board of Directors of Lyondell Petrochemical Company.

1.5  Company means Lyondell Petrochemical Company.

1.6  Death Benefits means the benefit described under and determined in
accordance with Article IV of the Plan.

1.7  Director means a Director of the Board.

1.8  Effective Date means November 28, 1988.

1.9  Financial Hardship means a condition of financial difficulty, relating to a
Non-Employee Director, Retiree or Beneficiary, as the case may be, determined by
the Administrative Committee, upon advice of counsel, to be sufficient to
justify a change of election in the form of benefit under either Article III or
IV, as applicable, without causing the receipt of taxable income by any other
participant in the Plan in advance of the payment to him of Plan benefits.

1.10 Lump Sum Payment means a single cash payment which shall be the Actuarial
Equivalent of the sum of the monthly payments otherwise payable (or the
remainder payable in the case of an election under Section 3.3(b) or 4.3(b))
during the Payment Period in the case of a Non-Employee Director with less than
180 months of completed Service on the Board and which shall be the Actuarial
Equivalent of a life annuity with a term certain of 180 months otherwise payable
(or the remainder payable in the case of an election under Section 3.3(b) or
4.3(b)) during the Payment Period in the case of a Non-Employee Director with
180 or more months of completed Service on the Board.
<PAGE>
 
1.11 Non-Employee Director means (i) a Director of the Company that is not a
current employee of the Company, Atlantic Richfield Company, ARCO Chemical
Company or a subsidiary or affiliate of any of these entities and who has not
been an employee of any of these entities within three years prior to the date
the person became a Director or (ii) a Director who for at least three (3) years
has not been an employee of any of the entities described in clause (i) above.

1.12 Pay for purposes of the Plan means an amount equal to one-twelfth of the
annual retainer paid to a Non-Employee Director immediately preceding the
earlier of termination of Service on the Board or death.  In the event of a
Change in Control, as determined under Section 5.3, Pay means an amount equal to
one-twelfth of the annual retainer paid to a Non-Employee Director immediately
preceding the Change in Control, but if the annual retainer has been reduced in
anticipation of the Change in Control, the amount shall equal one-twelfth the
annual retainer paid to a Non-Employee Director immediately prior to its
reduction.  Pay does not include fees paid for committee chairmanships, Board
and committee meeting fees or any other special director compensation.

1.13 Payment Period means the period the Retiree and/or Beneficiary receives
benefits in the form of a monthly allowance from this Plan.  The Payment Period
will be that number of months equal to the Non-Employee Director's Service on
the Board expressed in months; provided, however, that if a Retiree completed
180 months or more of Service on the Board as a Non-Employee Director, the
Payment Period shall be the greater of 180 months or for the remaining life of
the Retiree.

1.14 Plan is the Retirement Plan for Non-Employee Directors of Lyondell
Petrochemical Company.

1.15 Retiree means a former Non-Employee Director with a vested benefit under
the Plan.

1.16 Retirement Benefit means the benefits described under and determined in
accordance with Section 3.1.

1.17 Service on the Board means (i) for a Non-Employee Director described in
Section 1.11(i) all service on the Board as a Non-Employee Director and (ii) for
a Non-Employee Director described in Section 1.11(ii), service on the Board from
the later of the date the Non-Employee Director became a Director or the Non-
Employee Director's termination of employment with the Company, Atlantic
Richfield Company, ARCO Chemical Company or a subsidiary or affiliate of any of
these entities, as applicable.  Service on the Board shall also include service
as a director of a company merged into the Company provided the Non-Employee
Director was a director of the acquired company immediately prior to the merger.

                                       2
<PAGE>
 
1.18 Trust Agreement means the Trust Agreement between Lyondell Petrochemical
Company and State Street Bank & Trust Company and any amendments or successor
agreements thereto.


                                  ARTICLE II

                            ELIGIBILITY AND VESTING
                                        
2.1  Any Non-Employee Director will be a participant in this Plan.

2.2  Any Non-Employee Director who has completed three (3) years of Service on
the Board will be vested in the benefits provided under Article III of the Plan.


                                  ARTICLE III

                               RETIREMENT BENEFIT

3.1  A Retiree shall be paid a monthly retirement allowance equal to Pay unless
an optional form of benefit was elected pursuant to Section 3.3.  The allowance
will be paid to the Retiree until the earlier of (i) the end of the applicable
Payment Period or (ii) the death of the Retiree.

3.2  The Retirement Benefit will commence in the month following retirement from
the Board provided the Retiree is at least age 65 at the time of retirement from
the Board.  The Retirement Benefit for a Retiree who left the Board prior to age
65 will commence in the month following attainment of age 65.

3.3  In lieu of a monthly retirement allowance, a Retiree may receive payment of
his Retirement Benefit in the form of a Lump Sum Payment upon termination of
Service on the Board and satisfaction of the following conditions:

          (a)  A Non-Employee Director must elect that the Retirement Benefit be
paid in the form of a Lump Sum Payment prior to the attainment of age 64 or at
least one year prior to termination of Service on the Board, if earlier.  A Non-
Employee Director who is age 64 or older when he becomes eligible to participate
in the Plan must elect to have the Retirement Benefit paid in the form of a Lump
Sum Payment within 30 days of becoming eligible to participate in the Plan.

          (b)  A Non-Employee Director who fails to timely elect a Lump Sum
Payment under subparagraph (a) or a Retiree currently receiving a monthly
retirement 

                                       3
<PAGE>
 
allowance who wishes to receive his remaining monthly benefits in the form of a
Lump Sum Payment may request the Administrative Committee to change the form of
payment previously elected. The Administrative Committee, in its sole
discretion, may allow such request provided that (i) the Administrative
Committee determines that the Non-Employee Director or Retiree has experienced a
Financial Hardship justifying the request for a change of election, or (ii) the
Non-Employee Director or Retiree, as applicable, agrees to accept a reduction in
amount of his Retirement Benefit, as determined to be necessary to preclude
constructive receipt of taxable income by any Non-Employee Director
participating in the Plan in advance of the payment to him of the Retirement
Benefit. The amount by which the Retirement Benefit is reduced under the
preceding sentence will be forfeited to the Company.

          (c)  The Lump Sum Payment option described in this Section may be
discontinued by the Company in its sole discretion at any time.  Any elections
made pursuant to this Section prior to the time when the Company discontinues
the Lump Sum Payment option shall be disregarded and Retirement Benefits shall
be paid in accordance with Section 3.1.


                                   ARTICLE IV

                                 DEATH BENEFITS

4.1  The Beneficiary of a Non-Employee Director who dies while a member of the
Board or a Retiree who dies prior to the attainment of age 65 will receive as a
Death Benefit an allowance equal to 50% of Pay unless an optional form of
benefit was elected pursuant to Section 4.3.  This allowance shall be payable
monthly commencing in the month following the Non-Employee Director's or
Retiree's death and shall continue until the end of the Payment Period or until
the death of the Beneficiary, whichever occurs first.  If the Non-Employee
Director or Retiree dies without designating a Beneficiary, then this allowance
shall be payable in the form of a Lump Sum Payment to the Director's estate.

4.2  The monthly retirement allowance paid a Retiree will be continued and paid
as a Death Benefit to the Beneficiary of a Retiree who dies on or after
attainment of age 65 unless the Retiree elected an optional form of benefit
pursuant to Section 4.3.  This allowance shall be payable monthly commencing in
the month following the Retiree's death and shall continue until the end of the
Payment Period or until the death of the Beneficiary, whichever occurs first.
If the Beneficiary dies prior to the end of such Payment Period, the remaining
payments will be paid in the form of a Lump Sum Payment to the Beneficiary's
estate.  If the Retiree dies without designating a Beneficiary, then such
allowance shall be payable in a Lump Sum Payment to the Retiree's estate.

                                       4
<PAGE>
 
4.3  (a)  In lieu of payment of the Death Benefit as a monthly allowance, a Non-
Employee Director may elect prior to commencement of his Retirement Benefit to
have the Death Benefit, if any, paid in the form of a Lump Sum Payment to his
Beneficiary.

     (b)  A Beneficiary of a deceased Non-Employee Director or Retiree may
request the Administrative Committee to change the Non-Employee Director's prior
election.  The Administrative Committee, in its sole discretion, may allow such
request provided that (i) the Administrative Committee determines that the
Beneficiary has experienced a Financial Hardship, justifying the request for a
change of election, or (ii) the Beneficiary agrees to accept a reduction in the
amount of the Death Benefit, as determined to be necessary, upon advice of
counsel, to preclude constructive receipt of taxable income by any Non-Employee
Director in advance of the payment to him of the Retirement Benefit.  The amount
by which the Death Benefit is reduced under the preceding sentence will be
forfeited to the Company.

     (c)  The Lump Sum Payment option described in this Section may be
discontinued by the Company in its sole discretion at any time.  Any elections
made pursuant to this Section prior to the time when the Company discontinues
the Lump Sum Payment option shall be disregarded and the Death Benefit shall be
paid in accordance with Section 4.1 or 4.2, as applicable.

4.4  No Death Benefit will be paid to any Beneficiary if the Retiree elected and
received a Lump Sum Payment of the Retirement Benefit described in Section 3.1.


                                   ARTICLE V

                               CHANGE IN CONTROL

5.1  Upon a Change in Control as defined in Section 5.3, the amount of benefits
for  all then remaining Non-Employee Directors shall be determined based on the
Non-Employee Director's Pay, as defined under Section 1.12 and Service on the
Board as of the date of Change in Control.  Service on the Board and Pay
following a Change in Control shall be disregarded for purposes of determining
the amount of benefits payable under this Plan.


     5.2  Notwithstanding any other provision of the Plan, on a Change in
Control, a Non-Employee Director, a Retiree or a Beneficiary of a deceased Non-
Employee Director or Retiree will receive a Lump Sum Payment of vested benefits
under the Plan, in lieu of payments in accordance with any form previously
selected by the Non-Employee Director or Retiree. This Lump Sum Payment shall be
made immediately to a Retiree and Beneficiary. It shall also be paid immediately
to a Non-Employee Director,

                                       5

<PAGE>
 
unless the Non-Employee Director previously elected an alternate payment
commencement date, as established under Administrative Committee procedures.

     5.3  For purposes of this Plan, a Change in Control will be deemed to have
occurred as of the date that one or more of the following occurs:

                                       6
<PAGE>
 
          (a)  Individuals who, as of the date hereof, constitute the entire
Board of Directors of the Company ("Incumbent Directors") cease for any reason
to constitute at least a majority of the Board; provided, however, that any
                                                --------  -------          
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by the Company's shareholders, was approved by a vote of
at least a majority of the then Incumbent Directors shall be considered as
though such individual was an Incumbent Director, but excluding, for this
purpose any such individual whose initial assumption of office occurs as a
result of either an actual or threatened election contest, as such terms are
used in Rule 14a-11 under the Exchange Act or other actual or threatened
solicitation of proxies or consents by or on behalf of any Person (as defined
below) other than the Board; provided, further, that in the event ARCO at any
                             --------  -------                               
time determines to achieve minority representation on the Company's Board of
Directors approximately equal to its then ownership percentage of the Company's
common stock, its implementation of such determination through the election of
ARCO employees as directors of the Company shall not be deemed to be a Change in
Control and such ARCO employees shall constitute Incumbent Directors;

          (b)  The stockholders of the Company shall approve (A) any merger,
consolidation or recapitalization of the Company (or, if the capital stock of
the Company is affected, any subsidiary of the Company), or any sale, lease, or
other transfer (in one transaction or a series of transactions contemplated or
arranged by any party as a single plan) of all or substantially all of the
assets of the Company (each of the foregoing being an "Acquisition Transaction")
where (1) the shareholders of the Company immediately prior to such Acquisition
Transaction would not immediately after such Acquisition Transaction
beneficially own, directly or indirectly, shares or other ownership interests
representing in the aggregate 80 percent or more of (a) the then outstanding
common stock or other equity interests of the corporation or other entity
surviving or resulting from such merger, consolidation or recapitalization or
acquiring such assets of the Company, as the case may be (the "Surviving
Entity") (or of its ultimate parent corporation or other entity, if any), and
(b) the Combined Voting Power of the then outstanding Voting Securities of the
Surviving Entity (or of its ultimate parent corporation or other entity, if any)
or (2) the Incumbent Directors at the time of the initial approval of such
Acquisition Transaction would not immediately after such Acquisition Transaction
constitute a majority of the Board of Directors, or similar managing group, of
the Surviving Entity (or of its ultimate parent corporation or other entity, if
any), or (B) any plan or proposal for the liquidation or dissolution of the
Company;

          (c)  Any Person except for ARCO shall be or become the beneficial
owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
indirectly, of securities of the Company representing in the aggregate more than
twenty percent (20%) of either (A) the then outstanding shares of common stock
of the Company ("Common Shares") or (B) the Combined Voting Power of all then
outstanding Voting Securities of the Company; provided, however, that
                                              --------  -------      
notwithstanding the foregoing, a "Change in Control" shall not be deemed to have
occurred for purposes of this Subsection (iii)

                                       7
<PAGE>
 
               (1)  Solely as a result of an acquisition of securities by the
Company which, by reducing the number of Common Shares or other Voting
Securities outstanding, increases (a) the proportionate number of Common Shares
beneficially owned by any Person to more than 20 percent of the Common Shares
then outstanding, or (b) the proportionate voting power represented by the
Voting Securities beneficially owned by any Person to more than 20 percent of
the Combined Voting Power of all then outstanding Voting Securities; or

               (2)  Solely as a result of an acquisition of securities directly
from the Company except for any conversion of a security that was not acquired
directly from the Company, provided, further, that if any Person referred to in
                           --------  -------
paragraph (1) or (2) of this Subsection (iii) shall thereafter become the
beneficial owner of any additional Common Shares or other Voting Securities of
the Company (other than pursuant to a stock split, stock dividend or similar
transaction), then a "Change in Control" shall be deemed to have occurred for
purposes of this Subsection (iii)

          (d)  ARCO shall become the owner, directly or indirectly, of
securities of the Company representing in the aggregate more than 50 percent of
either (i) the then outstanding Common Shares or (ii) the Combined Voting Power
of all then outstanding Voting Securities of the Company except as the result of
an acquisition of securities by the Company which, by reducing the number of
Common Shares or other Voting Securities outstanding, increases (x) the
proportionate number of Common Shares beneficially owned by ARCO to more than 50
percent of the Common Shares then outstanding, or (y) the proportionate voting
power represented by the Voting Securities beneficially owned by ARCO to more
than 50 percent of the Combined Voting Power of all then outstanding Voting
Securities; provided, however, that if thereafter ARCO becomes the beneficial
            --------  -------
owner of any additional Common Shares or other Voting Securities of the Company
(other than pursuant to a stock split, stock dividend or similar transaction)
the exception provided above shall no longer apply; provided, further, that for
                                                    --------  -------
purposes of this Subsection (iv), neither record ownership of common stock of
the Company by the Trustee for ARCO's 401(a) qualified plans nor beneficial
ownership of common stock of the Company by any of ARCO's directors for their
personal account shall be deemed to constitute "indirect" ownership of common
stock of the Company by ARCO; provided, further, that notwithstanding any
                              --------  -------
contrary provision of the Plan, no Change in Control shall be deemed to have
occurred pursuant to this Subsection (iv) if as a result of an inadvertent act
ARCO becomes the owner, directly or indirectly, of additional Common Shares or
Voting Securities and such securities are sold or otherwise disposed of by ARCO
within 30 days after ARCO discovers, or is notified by the Company as to, the
potential Change of Control resulting from such ownership, so that, as a result
of such subsequent sale or other disposition by ARCO, no Change in Control would
otherwise be deemed to have occurred pursuant to the terms (excluding this
proviso) of this Subsection (iv).

                                       8
<PAGE>
 
     Notwithstanding any of the foregoing, no Change in Control shall be deemed
to have occurred as a result solely of (i) the registration by ARCO of the
Exchangeable Notes pursuant to the Registration Statement, (ii) the issuance and
sale by ARCO of the Exchangeable Notes to the underwriters in accordance with
the Registration Statement, or (iii) prior to the maturity of the Exchangeable
Notes, purchases and sales of the Exchangeable Notes.

          For purposes of this Section V:

          1.  "Affiliate" shall mean, as to a specified Person, another Person
that directly, or indirectly through one or more intermediaries, controls or is
controlled by, or is under common control with, the specified Person, within the
meaning of such terms as used in Rule 405 under the Securities Act of 1933, as
amended, or any successor rule.

          2.  "ARCO" shall mean Atlantic Richfield Company and any of its
Affiliates, excluding the Company.

          3.  "Combined Voting Power" shall mean the aggregate votes entitled to
be cast generally in the election of the Board of Directors, or similar managing
group, of a corporation or other entity by holders of then outstanding Voting
Securities of such corporation or other entity.

          4.  "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

          5.  "Exchangeable Notes" shall mean the debt securities exchangeable
upon maturity, at ARCO's option, into shares of the Company's common stock or
cash, as such debt securities are described in the Registration Statement.

          6.  "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
Liability Company organized under the laws of the State of Texas.

          7.  "Person" shall mean any individual, entity (including, without
limitation, any corporation, partnership, trust, joint venture, association or
governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2) of the
Exchange Act and the rules and regulations thereunder); provided, however, that
                                                        --------  -------      
Person shall not include the Company or LCR, any of their subsidiaries, any
employee benefit plan of the Company or LCR or any of their majority-owned
subsidiaries or any entity organized, appointed or established by the Company,
LCR or such subsidiaries for or pursuant to the terms of any such plan.

          8.  "Registration Statement" shall mean ARCO's registration statement
on Form S-3 (Registration No. 33-53481) with respect to the Exchangeable Notes.

                                       9
<PAGE>
 
          9.   "Voting Securities" shall mean all securities of a corporation or
other entity having the right under ordinary circumstances to vote in an
election of the Board of Directors, or similar managing group, of such
corporation or other entity.

                                      10
<PAGE>
 
                                   ARTICLE VI

                         SOURCE OF BENEFITS AND FUNDING

6.1  Non-Employee Directors, Retirees and their Beneficiaries shall have no
legal or equitable rights, claims or interests in any specific assets or
property of the Company, nor shall they be the beneficiaries of, or have any
rights, claims or interests in any life insurance policies, annuity contracts,
or the proceeds therefrom owned, or which may be acquired, by the Company
("Policies").  Any such Policies or other assets of the Company shall be, and
remain, the general, unpledged, unrestricted assets of the Company.  The
Company's obligation under the Plan shall be merely that of an unfunded and
unsecured promise of the Company to pay money in the future.

6.2  Although the Company is responsible for the payment of all benefits under
the Plan, the Company may, in its discretion, contribute funds to a grantor
trust for the purpose, as it deems appropriate, of paying benefits under this
Plan.  Such trust, including the Trust Agreement, may be irrevocable, but assets
of trust shall be subject to the claims of creditors of Company.  To the extent
any benefits provided under the Plan are actually paid from the trust, the
Company shall have no further obligation with respect thereto but to the extent
not so paid, such benefits shall remain the obligation of, and shall be paid, by
the Company.  The Directors shall have the status of unsecured creditors insofar
as their legal claim for benefits under the Plan and the Non-Employee Directors
or Retirees shall have no security interest in the grantor trust.


                                  ARTICLE VII

                                 MISCELLANEOUS

7.1  The Company may, in its sole discretion, terminate, suspend or amend the
Plan at any time or from time to time, in whole or in part.  However, no
amendment, suspension, or termination of the Plan may reduce the benefit of a
Non-Employee Director, Retiree or Beneficiary accrued through the date of such
amendment, suspension or termination or adversely affect the right or ability of
a Non-Employee Director, Retiree or Beneficiary to receive such benefit in
accordance with the terms of the Plan as in effect on the date before such
amendment, suspension or termination.

7.2  Nothing contained herein will confer upon any Non-Employee Director the
right to be retained in the Service of the Company as a Director.

7.3  To the maximum extent permitted by law, no benefit under the Plan or assets
of the trust shall be assignable or subject in any manner to alienation, sale,
transfer, claims 

                                      11
<PAGE>
 
or creditors, pledge, attachment or encumbrances of any kind except as provided
in the applicable trust document.

7.4  The Administrative Committee may adopt rules and regulations to assist it
in the administration of the Plan.  The Administrative Committee shall in its
sole discretion have the right to appoint such agents as it may deem necessary
to carry out is duties pursuant to the provisions of the Plan.

7.5  (a)  The Administrative Committee shall be charged with the administration
of the Plan and shall decide all questions arising in the administration,
interpretation and application of the Plan, including all questions of benefit
payments.  The decision of the Administrative Committee shall be conclusive and
binding on all parties, provided that the Administrative Committee has acted in
good faith and in accordance with the provisions of the Plan.

     (b)  Except as hereinbefore provided, any determination by a majority of
the Administrative Committee at a meeting thereof, whether in person or by
telephone, or without a meeting by a resolution or memorandum signed by all the
members, shall be final and conclusive on the Company, on all Directors,
Retirees and Beneficiaries claiming any right hereunder, and on all third
parties dealing with the Company.

     (c)  Any member of the Administrative Committee may resign at any time by
giving written notice to the other members and to the Company, effective as
therein stated, or otherwise upon receipt.

7.6  Each Non-Employee Director shall receive a copy of the Plan and the
Administrative Committee will make available for inspection by any Non-Employee
Director a copy of the rules and regulations used by the Administrative
Committee in administering the Plan.

7.7  Each Non-Employee Director shall cooperate with the Company by furnishing
any and all information requested by the Company in order to facilitate the
payment of benefits hereunder, taking such physical examinations as the Company
may deem necessary and taking such other relevant action as may be requested by
the Company.  If a Non-Employee Director refuses to cooperate, the Company shall
have no further obligation to the Non-Employee Director under the Plan.  If a
Non-Employee Director makes any material misstatement of information or
nondisclosure of medical history, then no benefits will be payable hereunder to
such Non-Employee Director or his Beneficiary, provided, that in the Company's
sole discretion, benefits may be payable in an amount reduced to compensate the
Company for any loss, cost, damage or expense suffered or incurred by the
Company as a result in any way of any action, misstatement or nondisclosure.

                                      12
<PAGE>
 
7.8  The Plan is established under and will be construed according to the laws
of the State of Texas.

                                      13

<PAGE>
 
                                                                EXHIBIT 10.12(a)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

                  RETIREMENT PLAN FOR NON-EMPLOYEE DIRECTORS
                                        

LYONDELL PETROCHEMICAL COMPANY hereby amends the Lyondell Petrochemical Company
Retirement Plan for Non-Employee Directors, effective August 1, 1997, to read as
follows:

ARTICLE V, CHANGE IN CONTROL, Section 5.3, is amended to read as follows:

     5.3  For purposes of this Plan, a Change in Control will be deemed to have
occurred as of the date that one or more of the following occurs:


     (a)  Individuals who, as of the date hereof, constitute the entire Board of
Directors of the Company ("Incumbent Directors") cease for any reason to
constitute at least a majority of the Board; provided, however, that any
                                             --------  -------          
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by the Company's shareholders, was approved by a vote of
at least a majority of the then Incumbent Directors shall be considered as
though such individual was an Incumbent Director, but excluding, for this
purpose any such individual whose initial assumption of office occurs as a
result of either an actual or threatened election contest, as such terms are
used in Rule 14a-11 under the Exchange Act or other actual or threatened
solicitation of proxies or consents by or on behalf of any Person (as defined
below) other than the Board; provided, further, that in the event ARCO at any
                             --------  -------                               
time determines to achieve minority representation on the Company's Board of
Directors approximately equal to its then ownership percentage of the Company's
common stock, its implementation of such determination through the election of
ARCO employees as directors of the Company shall not be deemed to be a Change in
Control and such ARCO employees shall constitute Incumbent Directors;


     (b)  The stockholders of the Company shall approve (A) any merger,
consolidation or recapitalization of the Company (or, if the capital stock of
the Company is affected, any subsidiary of the Company), or any sale, lease, or
other transfer (in one transaction or a series of transactions contemplated or
arranged by any party as a single plan) of all or substantially all of the
assets of the Company (each of the foregoing being an "Acquisition Transaction")
where (1) the shareholders of the Company immediately prior to such Acquisition
Transaction would not immediately after such Acquisition Transaction
beneficially own, directly or indirectly, shares or other ownership interests
representing in 
<PAGE>
 
the aggregate eighty percent (80%) or more of (a) the then outstanding common
stock or other equity interests of the corporation or other entity surviving or
resulting from such merger, consolidation or recapitalization or acquiring such
assets of the Company, as the case may be (the "Surviving Entity") (or of its
ultimate parent corporation or other entity, if any), and (b) the Combined
Voting Power of the then outstanding Voting Securities of the Surviving Entity
(or of its ultimate parent corporation or other entity, if any) or (2) the
Incumbent Directors at the time of the initial approval of such Acquisition
Transaction would not immediately after such Acquisition Transaction constitute
a majority of the Board of Directors, or similar managing group, of the
Surviving Entity (or of its ultimate parent corporation or other entity, if
any), or (B) any plan or proposal for the liquidation or dissolution of the
Company;

     (c)  Any Person except for ARCO shall be or become the beneficial owner (as
defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
indirectly, of securities of the Company representing in the aggregate more than
twenty percent (20%) of either (i) the then outstanding shares of common stock
of the Company ("Common Shares") or (ii) the Combined Voting Power of all then
outstanding Voting Securities of the Company; provided, however, that
                                              --------  -------      
notwithstanding the foregoing, a "Change of Control" shall not be deemed to have
occurred for purposes of this subsection (c).

          (1) Solely as a result of an acquisition of securities by the Company
     which, by reducing the number of Common Shares or other Voting Securities
     outstanding, increases (a) the proportionate number of Common Shares
     beneficially owned by any Person to more than twenty percent (20%) of the
     Common Shares then outstanding, or (b) the proportionate voting power
     represented by the Voting Securities beneficially owned by any Person to
     more than twenty percent (20%) of the Combined Voting Power of all then
     outstanding Voting Securities; or

          (2) Solely as a result of an acquisition of securities directly from
     the Company except for any conversion of a security that was not acquired
     directly from the Company,

provided, further, that if any Person referred to in paragraph (1) or (2) of
- --------  -------                                                           
this subsection (c) shall thereafter become the beneficial owner of any
additional Common Shares or other Voting Securities of the Company (other than
pursuant to a stock split, stock dividend or similar transaction), then a
"Change of Control" shall be deemed to have occurred for purposes of this
subsection (c); or

     (d)  ARCO shall become the owner, directly or indirectly, of securities of
the Company representing in the aggregate more than fifty percent (50%) of
either (i) the then outstanding Common Shares or (ii) the Combined Voting Power
of all then outstanding Voting Securities of the Company except as the result of
an acquisition of securities by the Company which, by reducing the number of
Common Shares or other Voting Securities outstanding, increases (x) the
proportionate number of Common Shares beneficially owned by ARCO to more than
fifty percent (50%) of the Common Shares then outstanding, or (y) 

                                       2
<PAGE>
 
the proportionate voting power represented by the Voting Securities beneficially
owned by ARCO to more than fifty percent (50%) of the Combined Voting Power of
all then outstanding Voting Securities; provided, however, that if thereafter
                                        --------  -------                    
ARCO becomes the beneficial owner of any additional Common Shares or other
Voting Securities of the Company (other than pursuant to a stock split, stock
dividend or similar transaction) the exception provided above shall no longer
apply; provided, further, that for purposes of this subsection (d), neither
       --------  -------                                                   
record ownership of common stock of the Company by the Trustee for ARCO's 401(a)
qualified plans nor beneficial ownership of common stock of the Company by any
of ARCO's directors for their personal account shall be deemed to constitute
"indirect" ownership of common stock of the Company by ARCO; provided, further,
                                                             --------  ------- 
that notwithstanding any contrary provision of this Agreement, no Change in
Control shall be deemed to have occurred pursuant to this subsection (d) if as a
result of an inadvertent act ARCO becomes the owner, directly or indirectly, of
additional Common Shares or Voting Securities and such securities are sold or
otherwise disposed of by ARCO within 30 days after ARCO discovers, or is
notified by the Company as to, the potential Change of Control resulting from
such ownership, so that, as a result of such subsequent sale or other
disposition by ARCO, no Change in Control would otherwise be deemed to have
occurred pursuant to the terms (excluding this proviso) of this subsection (d).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
to have occurred as a result solely of (i) the registration by ARCO of the
Exchangeable Notes pursuant to the Registration Statement, (ii) the issuance and
sale by ARCO of the Exchangeable Notes to the underwriters in accordance with
the Registration Statement, (iii) prior to the maturity of the Exchangeable
Notes, purchases and sales of the Exchangeable Notes, or (iv) a transaction in
which assets of the Company are contributed to an entity pursuant to the
creation of a partnership under the terms of certain agreements authorized by
the Incumbent Directors on July 25, 1997.

     (e)  For purposes of this Section 5.3:

          (1)  "Affiliate" shall mean, as to a specified Person, another Person
     that directly, or indirectly through one or more intermediaries, controls
     or is controlled by, or is under common control with, the specified Person,
     within the meaning of such terms as used in Rule 405 under the Securities
     Act of 1933, as amended, or any successor rule.

          (2)  "ARCO" shall mean Atlantic Richfield Company and any of its
     Affiliates, excluding the Company.

          (3)  "Combined Voting Power" shall mean the aggregate votes entitled
     to be cast generally in the election of the Board of Directors, or similar
     managing group, of a corporation or other entity by holders of then
     outstanding Voting Securities of such corporation or other entity.

                                       3
<PAGE>
 
          (4)  "Exchangeable Notes" shall mean the debt securities exchangeable
     upon maturity, at ARCO's option, into shares of the Company's common stock
     or cash, as such debt securities are described in the Registration
     Statement.

          (5)  "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
     Liability Company organized under the laws of the State of Texas.

          (6)  "Person" shall mean any individual, entity (including, without 
     limitation, any corporation, partnership, trust, joint venture, association
     or governmental body) or group (as defined in Sections 14(d)(3) or 15(d)(2)
     of the Exchange Act and the rules and regulations thereunder); provided,
                                                                    -------- 
     however, that Person shall not include the Company or LCR, any of their
     -------                                                                
     subsidiaries, any employee benefit plan of the Company or LCR or any of
     their majority-owned subsidiaries or any entity organized, appointed or
     established by the Company, LCR or such subsidiaries for or pursuant to the
     terms of any such plan.

          (7)  "Registration Statement" shall mean ARCO's registration statement
     on Form S-3 (Registration No. 33-53481) with respect to the Exchangeable
     Notes.

          (8)  "Voting Securities" shall mean all securities of a corporation or
     other entity having the right under ordinary circumstances to vote in an
     election of the Board of Directors, or similar managing group, of such
     corporation or other entity.


IN WITNESS WHEREOF, LYONDELL PETROCHEMICAL COMPANY, acting by and through its
duly authorized officer, has caused this Instrument to be executed on this ____
day of August, 1997.


ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY


By:______________________               By:_____________________________________
    Assistant Secretary                      Jeffrey R. Pendergraft
                                             Senior Vice President and Secretary

                                       4

<PAGE>
 
                                                                EXHIBIT 10.13(a)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

                             RESTRICTED STOCK PLAN

                          FOR NON-EMPLOYEE DIRECTORS

LYONDELL PETROCHEMICAL COMPANY hereby amends the Lyondell Petrochemical Company
Restricted Stock Plan for Non-Employee Directors, effective August 1, 1997, as
follows:


Section 5. Terms and Conditions of Restricted Shares, subsection (d)(iii),
           -----------------------------------------                      
Change of Control, is amended to read as follows:

Section 5  Terms and Conditions of Restricted Shares
           -----------------------------------------

          (d)  (iii)  "Change in Control" shall mean a change in control as
               defined in the Company's Non-Employee Director Benefit Plans
               Trust Agreement.


IN WITNESS WHEREOF, LYONDELL PETROCHEMICAL COMPANY, acting by and through its
duly authorized officer, has caused this Instrument to be executed on August
___,1997.

ATTEST:                       LYONDELL PETROCHEMICAL COMPANY

By:____________________       By:________________________________
     Assistant Secretary           Jeffrey R. Pendergraft
                                   Senior Vice President and Secretary

<PAGE>
 
                                                                   EXHIBIT 10.14

                        LYONDELL PETROCHEMICAL COMPANY
                     NON-EMPLOYEE DIRECTORS BENEFIT PLANS
                                TRUST AGREEMENT


                      (EFFECTIVE AS OF FEBRUARY 1, 1997)
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE> 
<CAPTION> 
                                                            PAGE
<S>                                                         <C>
Recitals....................................................   1
Section 1.  Creation of the Trust...........................   2
Section 2.  Limitation on Use of Funds......................   3
Section 3.  Change in Control...............................   4
Section 4.  Independent Plan Administrator..................   8
Section 5.  Excess Revision.................................   9
Section 6.  Authority of Investment Officer.................  10
Section 7.  Duties and Powers of Trustee with Respect to
              Investments...................................  10
Section 8.  Additional Powers and Duties of the Trustee.....  13
Section 9.  Insurance Policies and Contracts................  14
Section 10. Participating Plan Records......................  15
Section 11. Valuation.......................................  15
Section 12. Participant Records Prior to and Following a
              Change in Control.............................  16
Section 13. Trustee Accounts................................  16
Section 14. Investment of Cash..............................  17
Section 15. Payments by the Trustee.........................  18
Section 16. Determination of Change in Control..............  19
Section 17. Trustee Compensation and Trust Expenses.........  19
Section 18. Payment of Taxes By Trustee.....................  20
Section 19. Custodians and Agents...........................  20
Section 20. Liability for Benefit Payments..................  20
Section 21. Company Insolvency..............................  21
Section 22. Trustee Responsibility for Plan Administration
              and Trust Record Keeping After Change in
              Control.......................................  22
Section 23. Trustee Standards of Performance and
              Indemnification    ...........................  23
Section 24. Removal and Resignation of Trustee..............  24
Section 25. Termination of Participating Plan or Plans......  25
Section 26. Rights of Company to Trust Assets...............  25
Section 27. Amendment of Trust..............................  25
Section 28. Termination of Trust............................  26
Section 29. Successors......................................  27
Section 30. Communications..................................  27
Section 31. Unclaimed Distributions.........................  28
Section 32. Prohibition of Assignments......................  28
Section 33. Governing Law...................................  28
Section 34. Execution.......................................  28
 
Appendix A..................................................  30
</TABLE>
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY
                                        
                     NON-EMPLOYEE DIRECTORS BENEFIT PLANS
                                TRUST AGREEMENT

  THIS AGREEMENT, as adopted as of February 1, 1997, between LYONDELL
PETROCHEMICAL COMPANY (the "Company"), and STATE STREET BANK AND TRUST COMPANY,
a banking corporation having its principal place of business at 225 Franklin
Street, Boston, Massachusetts, 01201 (the "Trustee");

                                R E C I T A L S

  A.  Effective February 1,1997, the Company and the Trustee enter into this
Agreement to create a Trust (defined under Section 1 of this Trust Agreement)
for purposes of the Lyondell Petrochemical Company Retirement Plan for Non-
Employee Directors, the Lyondell Petrochemical Company Elective Deferral Plan
for Non-Employee Directors and any benefit plans that may be established and
maintained by the Company for its non-employee directors after the effective
date of this Trust and that permit funding by this Trust. The benefit plans that
may be funded by this Trust are listed in Appendix A attached hereto and shall
hereinafter be referred to as the "Participating Plans".

  B.  The amount and timing of benefit payments ("Benefits") to which the
participants of the Participating Plans (the "Trust Beneficiaries") are or may
become entitled under each of the Participating Plans are set forth in the
Participating Plans.

  C.  The Company established this trust fund to assist it in accumulating the
amounts necessary to satisfy its contractual liability to pay Benefits under the
Participating Plans.

  D.  The Company is obligated to pay all Benefits from its general assets to
the extent not paid by this Trust and this Trust Agreement shall not reduce or
otherwise affect the Company's continuing liability to pay Benefits from such
assets, except that the Company's liability shall be offset by actual benefit
payments made from this Trust.

  E.  This trust is intended to be a "grantor trust" with the result that the
corpus and income of the Trust shall be treated as assets and income of the
Company pursuant to Sections 671 through 679 of the Internal Revenue Code of
1986, as amended (the "Code").

                                       1
<PAGE>
 
  F.  The Company intends that the Trust shall at all times be subject to the
claims of the Company's creditors as herein provided and that the Participating
Plans shall not be deemed funded within the meaning of the Employee Retirement
Income Security Act of 1974, as amended, ("ERISA") solely by virtue of the
existence of this Trust Agreement.

  NOW, THEREFORE, in consideration of the mutual covenants herein contained, the
parties hereto agree as follows:

                                   SECTION 1

                             CREATION OF THE TRUST

  There is hereby established and continued with the Trustee a trust consisting
of all sums paid to it for purposes of the Participating Plans, investments
thereof and any earnings, appreciations or losses thereon, which, less
disbursements made by Trustee, and amounts paid to the Company as provided in
Section 2 of this Trust Agreement, are referred to herein as the "Trust" and
shall be dealt with as provided in this Trust Agreement.  The Trust shall be
held for the exclusive purpose of providing payments to Trust Beneficiaries in
accordance with the provisions of the Participating Plans, and defraying
reasonable expenses of administration in accordance with the provisions of this
Trust Agreement until all such payments required by this Trust Agreement have
been made, subject to the provisions on the use of Funds under Section 2 of this
Trust Agreement, and to the requirement that the Trust shall at all times be
subject to the claims of the general creditors of the Company as set forth in
Sections 21.1 and 21.2 of this Trust Agreement.  The Trustee shall have no duty
or authority to inquire into the correctness of amounts tendered to it or to
enforce the collection of any contribution by the Company.

  The Company shall direct the Trustee to establish a separate subtrust
("Subtrust") for each Plan to which the Trustee shall credit contributions it
receives which are earmarked for that Plan and Subtrust.  Each Subtrust shall
reflect an undivided interest in assets of the trust fund and shall not require
any segregation of particular assets.  When Subtrusts are established, all
contributions shall be designated by the Company for a particular Subtrust.
However, any contribution received by the Trustee which is not designated by the
Company for a particular Subtrust before a Change in Control shall be allocated
among the Subtrusts in proportion to each Participating Plan's pro rata interest
in the Trust, as calculated during the last Valuation.  When a Subtrust

                                       2
<PAGE>
 
is established at a date subsequent to execution of this Agreement, the Trustee
shall allocate the Trust assets among the separate Subtrusts as directed by the
Company prior to a Change in Control.

  The Company may direct the Trustee, or the Independent Plan Administrator  may
determine on its own initiative after a Change in Control, to maintain a
separate sub-account within each Subtrust for a Plan for each Participant who is
covered by the Subtrust.  If so directed, each sub-account in a Subtrust shall
reflect an individual interest in assets of the Subtrust and, as much as
possible, shall operate in the same manner as if it were a separate Subtrust.

  The Trustee shall allocate investment earnings and losses and expenses of the
trust fund as of a valuation date among the Subtrusts in proportion to their
balances.  Payments to creditors as directed by a court of competent
jurisdiction in the event of the Company's insolvency shall be charged against
the Subtrusts in proportion to their balances, except that payment of Plan
benefits to a Participant as a general creditor shall be charged against the
Subtrust for that Plan.

  Assets allocated to a Subtrust for one Plan may not be used to provide
benefits under any other Plans until all benefits under such Plan have been paid
in full, except that excess assets of a Subtrust may be transferred to other
Subtrusts.

                                   SECTION 2

                          LIMITATION ON USE OF FUNDS

No part of the corpus of the Trust shall be recoverable by the Company, borrowed
by or against for the benefit of the Company or used for any purpose other than
for the exclusive purpose of providing payments to Trust Beneficiaries in
accordance with the provisions of the Participating Plans and defraying
reasonable expenses of administration in accordance with the provisions of this
Trust Agreement until all such payments required by this Trust Agreement have
been made; provided, however, that (i) nothing in this Section 2 shall be deemed
to limit or otherwise prevent the payment from the Trust of (a) amounts
described in Section 5 of this Trust Agreement, (b) expenses and other charges
as provided in Section 17 and 18 of this Trust Agreement, or (c) the application
of the Trust as provided in Sections 15.5 or 28 of this Trust Agreement, and
(ii) the Trust shall at all times be subject to the claims of the general
creditors of the Company as set forth in Section 21.1 and 21.2 of this Trust
Agreement.

                                       3
<PAGE>
 
                                   SECTION 3

                               CHANGE IN CONTROL

     Section 3.1.  General.  Various provisions of this Trust Agreement provide
     ------------
for certain rights and obligations upon and following a Change in Control of the
Company.

     Section 3.2.  Definition of "Change in Control".  For purposes of this
     ------------
Trust Agreement, a "Change in Control" shall be deemed to have occurred as of
the date that one or more of the following occurs:
     
     A.   Individuals who, as of the date hereof, constitute the entire Board of
     Directors of the Company ("Incumbent Directors") cease for any reason to
     constitute at least a majority of the Board; provided, however, that any
                                                  --------  -------          
     individual becoming a director subsequent to the date hereof whose
     election, or nomination for election by the Company's shareholders, was
     approved by a vote of at least a majority of the then Incumbent Directors
     shall be considered as though such individual was an Incumbent Director,
     but excluding, for this purpose any such individual whose initial
     assumption of office occurs as a result of either an actual or threatened
     election contest, as such terms are used in Rule 14a-11 under the Exchange
     Act or other actual or threatened solicitation of proxies or consents by or
     on behalf of any Person (as defined below) other than the Board; provided,
                                                                      -------- 
     further, that in the event ARCO at any time determines to achieve minority
     -------                                                                   
     representation on the Company's Board of Directors approximately equal to
     its then ownership percentage of the Company's common stock, its
     implementation of such determination through the election of ARCO employees
     as directors of the Company shall not be deemed to be a Change in Control
     and such ARCO employees shall constitute Incumbent Directors;



     B.   The stockholders of the Company shall approve (1) any merger,
     consolidation or recapitalization of the Company (or, if the capital stock
     of the Company is affected, any subsidiary of the Company), or any sale,
     lease, or other transfer (in one transaction or a series of transactions
     contemplated or arranged by any party as a single plan) of all or
     substantially all of the assets of the Company (each of the foregoing being
     an "Acquisition Transaction") where (i) the shareholders of the Company
     immediately prior to such Acquisition Transaction would not immediately
     after such Acquisition Transaction beneficially own, directly or
     indirectly, shares or other ownership interests representing

                                       4
<PAGE>
 
     in the aggregate eighty percent (80%) or more of (a) the then outstanding
     common stock or other equity interests of the corporation or other entity
     surviving or resulting from such merger, consolidation or recapitalization
     or acquiring such assets of the Company, as the case may be (the "Surviving
     Entity") (or of its ultimate parent corporation or other entity, if any),
     and (b) the Combined Voting Power of the then outstanding Voting Securities
     of the Surviving Entity (or of its ultimate parent corporation or other
     entity, if any) or (ii) the Incumbent Directors at the time of the initial
     approval of such Acquisition Transaction would not immediately after such
     Acquisition Transaction constitute a majority of the Board of Directors, or
     similar managing group, of the Surviving Entity (or of its ultimate parent
     corporation or other entity, if any), or (2) any plan or proposal for the
     liquidation or dissolution of the Company;

     C.   Any Person except for ARCO shall be or become the beneficial owner (as
     defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
     indirectly, of securities of the Company representing in the aggregate more
     than twenty percent (20%) of either (1) the then outstanding shares of
     common stock of the Company ("Common Shares") or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company; provided,
                                                                     -------- 
     however, that notwithstanding the foregoing, a "Change of Control" shall
     -------                                                                 
     not be deemed to have occurred for purposes of this Subsection (C):

          (i)  Solely as a result of an acquisition of securities by the Company
          which, by reducing the number of Common Shares or other Voting
          Securities outstanding, increases (a) the proportionate number of
          Common Shares beneficially owned by any Person to more than twenty
          percent (20%) of the Common Shares then outstanding, or (b) the
          proportionate voting power represented by the Voting Securities
          beneficially owned by any Person to more than twenty percent (20%) of
          the Combined Voting Power of all then outstanding Voting Securities;
          or

          (ii) Solely as a result of an acquisition of securities directly from
          the Company except for any conversion of a security that was not
          acquired directly from the Company,

     provided, further, that if any Person referred to in paragraph (i) or (ii)
     --------  -------
     of this Subsection (C) shall thereafter become the beneficial owner of any
     additional Common Shares or other Voting Securities of the Company (other
     than

                                       5
<PAGE>
 
     pursuant to a stock split, stock dividend or similar transaction), then a
     "Change of Control" shall be deemed to have occurred for purposes of this
     Subsection (C); or

     D.  ARCO shall become the owner, directly or indirectly, of securities of
     the Company representing in the aggregate more than fifty percent (50%) of
     either (1) the then outstanding Common Shares or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company except as
     the result of an acquisition of securities by the Company which, by
     reducing the number of Common Shares or other Voting Securities
     outstanding, increases (x) the proportionate number of Common Shares
     beneficially owned by ARCO to more than fifty percent (50%) of the Common
     Shares then outstanding, or (y) the proportionate voting power represented
     by the Voting Securities beneficially owned by ARCO to more than fifty
     percent (50%) of the Combined Voting Power of all then outstanding Voting
     Securities; provided, however, that if thereafter ARCO becomes the
                 --------  -------                                     
     beneficial owner of any additional Common Shares or other Voting Securities
     of the Company (other than pursuant to a stock split, stock dividend or
     similar transaction) the exception provided above shall no longer apply;
     provided, further, that for purposes of this Subsection (D), neither record
     --------  -------                                                          
     ownership of common stock of the Company by the Trustee for ARCO's 401(a)
     qualified plans nor beneficial ownership of common stock of the Company by
     any of ARCO's directors for their personal account shall be deemed to
     constitute "indirect" ownership of common stock of the Company by ARCO;
     provided, further, that notwithstanding any contrary provision of this
     --------  -------                                                     
     Trust Agreement, no Change in Control shall be deemed to have occurred
     pursuant to this Subsection (D) if as a result of an inadvertent act ARCO
     becomes the owner, directly or indirectly, of additional Common Shares or
     Voting Securities and such securities are sold or otherwise disposed of by
     ARCO within 30 days after ARCO discovers, or is notified by the Company as
     to, the potential Change of Control resulting from such ownership, so that,
     as a result of such subsequent sale or other disposition by ARCO, no Change
     in Control would otherwise be deemed to have occurred pursuant to the terms
     (excluding this proviso) of this Subsection (D).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
     to have occurred as a result solely of (1) the registration by ARCO of the
     Exchangeable Notes pursuant to the Registration Statement, (2) the issuance
     and sale by ARCO of the Exchangeable Notes to the underwriters in
     accordance with the Registration Statement, or (3) prior to the maturity of
     the Exchangeable Notes, purchases and sales 

                                       6
<PAGE>
 
     of the Exchangeable Notes.

     Section 3.3.  Funding on Change in Control.  The Company, within 30 days
     ------------                                                            
following a Change in Control, shall be required to irrevocably deposit
additional cash or other property, acceptable to the Trustee, to this Trust in
an amount equal to the Certified Benefit Values, as described in Section 5, as
certified by an Enrolled Actuary unaffiliated with the Company, which may become
payable as a result of a Change in Control, less the present value of Trust
assets determined as of the date of the Change in Control.

     Section 3.4.  For purposes of Section 3.1 of this Trust Agreement:
     ------------                                                      

     A.   "Affiliate" shall mean, as to a specified Person, another Person that
     directly, or indirectly through one or more intermediaries, controls or is
     controlled by, or is under common control with, the specified Person,
     within the meaning of such terms as used in Rule 405 under the Securities
     Act of 1933, as amended, or any successor rule.

     B.   "ARCO" shall mean Atlantic Richfield Company and any of its
     Affiliates, excluding the Company.

     C.   "Combined Voting Power" shall mean the aggregate votes entitled to be
     cast generally in the election of the Board of Directors, or similar
     managing group, of a corporation or other entity by holders of then
     outstanding Voting Securities of such corporation or other entity.

     D.   "Exchangeable Notes" shall mean the debt securities exchangeable upon
     maturity, at ARCO's option, into shares of the Company's common stock or
     cash, as such debt securities are described in the Registration Statement.

     E.   "LCR" shall mean LYONDELL-CITGO Refining Company Ltd., a Limited
     Liability Company organized under the laws of the State of Texas.

     F.   "Person" shall mean any individual, entity (including, without
     limitation, any corporation, partnership, trust, joint venture, association
     or governmental body) or group (as defined in Sections 14(d)(3) or 
     15(d)(2) of the Exchange Act and the rules and regulations thereunder);
     provided, however, that Person shall not include the Company or LCR, any of
     --------  -------
     their subsidiaries, any employee benefit plan of the Company or LCR or any
     of their majority-owned subsidiaries or any entity organized, appointed or
     established by the Company,

                                       7
<PAGE>
 
     LCR or such subsidiaries for or pursuant to the
     terms of any such plan.

     G.   "Registration Statement" shall mean ARCO's registration statement on
     Form S-3 (Registration No. 33-53481) with respect to the Exchangeable
     Notes.

     H.   "Voting Securities" shall mean all securities of a corporation or
     other entity having the right under ordinary circumstances to vote in an
     election of the Board of Directors, or similar managing group, of such
     corporation or other entity.

                                   SECTION 4
                                        
                        INDEPENDENT PLAN ADMINISTRATOR


     Various provisions of this Trust Agreement refer to the term "Independent
Plan Administrator" which shall mean, unless stated otherwise in a specific
provision of this Trust Agreement, and, except as provided below, an entity
which is unrelated to, and unaffiliated with, the Company, and which, prior to a
Change in Control has accepted in writing the position of Independent Plan
Administrator under this Trust Agreement. The Independent Plan Administrator
shall not be considered to be related to or affiliated with the Company solely
as a result of an agreement between the Independent Plan Administrator and the
Company to provide individual financial counseling services to specified Company
executives. The Independent Plan Administrator shall be appointed by the Company
and shall have its duties specified in an agreement executed by the Company and
the Independent Plan Administrator prior to a Change in Control. The Trustee
shall be given advance written notification of such appointment by the Company.
Following a Change in Control, if the Company had failed to designate an
Independent Plan Administrator prior to a Change in Control, the Independent
Plan Administrator shall be appointed by the Trustee following a Change in
Control and shall have its duties specified in an agreement executed by the
Trustee and the Independent Plan Administrator. In the event the Independent
Plan Administrator fails to act, provides services to the Company other than in
its capacity as Independent Plan Administrator other than as provided above, or
resigns, the Company prior to a Change in Control, or the Trustee after a Change
in Control, shall retain a successor Independent Plan Administrator.
Notwithstanding any other provision of this Trust Agreement, the Trustee shall
be responsible only for the prudent selection of an Independent Plan
Administrator after a Change in Control (i) following notice by the Company or
the Independent Plan Administrator of

                                       8
<PAGE>
 
disqualification of the Independent Plan Administrator through the provision of
services to the Company other than in its capacity as Independent Plan
Administrator, (ii) upon resignation or failure to act by the Company-appointed
Independent Plan Administrator, or (iii) in the event the Company failed to
appoint an Independent Plan Administrator prior to a Change in Control. The
Trustee shall be entitled to conclusively rely on the determinations of a
qualified Independent Plan Administrator.

                                   SECTION 5

                               EXCESS REVERSION

  Prior to a Change in Control, upon a determination that the assets of the
Trust have a value exceeding one hundred twenty-five percent (125%) of the
actuarial present value of accrued but unpaid benefits of the Participating
Plans, considered on the basis of assets being allocated to Participating Plans,
all or a portion of the amount of such assets which constitute the "Excess
Reversion" (as defined below) may be repaid to the Company upon direction of the
Company.  However, prior to any such repayment, the Company must deliver to the
Trustee a certified statement by an actuary who is an Enrolled Actuary under
ERISA and who is not affiliated with the Company of (i) the amount equal to one
hundred (100%) percent of the actuarial present value of the accrued but unpaid
benefits under the Participating Plans, calculated on an individual plan basis,
as described above, (the "Certified Benefit Values"), (ii) the value of the
Trust assets, allocated to each Participating Plan, as described above, and
(iii) the amount, if any, by which the value of the Trust assets under (ii)
exceeds the Certified Benefit Values under (i), and (iv) the amount, if any, by
which the value of the Trust assets under (ii) exceeds one hundred twenty-five
(125%) percent of the Certified Benefit Values (the "Excess Reversion"). The
actuary shall make each determination required to prepare the certified
statement based on reasonable factors, assumptions and tables (as determined
solely by such actuary). The Trustee shall repay assets of the Trust to the
Company as directed by the Company and in an amount up to but not greater than
the Excess Reversion.   Any repayment of assets of the Trust to the Company may
be made only prior to a Change in Control and shall be made within thirty (30)
days (or as soon as practicable) after the later of the Trustee's receipt of the
certified statement by the actuary and the Company's direction to make such a
payment.  Any separate allocations of assets pursuant to this Section 5 shall be
solely for the purpose of completing the valuation tests described in this
Section and shall not reflect any legal commitment of assets to any Trust
Beneficiary under a particular Participating Plan.

                                       9
<PAGE>
 
                                   SECTION 6

                        AUTHORITY OF INVESTMENT OFFICER

     Prior to a Change in Control, the Trustee shall be subject to the direction
of the Investment Officer (as defined below) of the Company with respect to the
investment of the assets of the Trust. Unless the Company and the Trustee have
mutually agreed in a separate writing that the Trustee shall have and exercise
investment discretion with respect to all or a portion of the assets of the
Trust, the Company shall have complete discretion with respect to the investment
of such assets at all times prior to a Change in Control, and shall direct the
Trustee accordingly. From time to time, the Trustee shall be notified in a
writing signed by an officer of the Company of the person or persons
constituting the "Investment Officer" for purposes of this Section and the
Trust. In each such notice, the Company shall warrant that all directions given
by the Investment Officer are proper. The Trustee shall have no responsibility
to review, or to consider the propriety of holding or selling any life
insurance, retirement income or annuity policies or contracts.

     Notwithstanding the Company's discretion to invest the Trust assets, the
Company shall not exercise this discretion to reacquire part or all of the
assets held in the Trust by substitution of or exchange for any other property
held by the Company directly or indirectly through any third party, related or
unrelated, and whether or not the property is equivalent, marketable, liquid, or
secured.


                                   SECTION 7

                         DUTIES AND POWERS OF TRUSTEE
                          WITH RESPECT TO INVESTMENTS

     After a Change in Control, the Trustee shall have sole discretion to invest
and reinvest the assets of, and to invest any additions to, the Trust in
personal property consisting of equity securities, debt instruments at the time
of purchase rated not less than BBB- by Standard & Poor's Corporation and its
successors ("S&P") or Baa3 by Moody's Investor Service, Inc. and its successors
("Moody's) or the equivalent of such ratings by S&P or Moody's for the types of
investments specified in Section 14 of this Trust Agreement ("Investment Grade
Securities") with the power to appoint any independent investment manager to
fulfill 

                                      10
<PAGE>
 
such obligation; provided, however, that (i) the Trustee shall be subject to any
prior directions and instructions of the Company prior to a Change in Control
regarding insurance, retirement income or annuity policies or contracts unless
the Independent Plan Administrator otherwise directs the Trustee, (ii) the
Independent Plan Administrator shall have sole power on and after a Change in
Control regarding the management, including the purchase, sale or retention
(including all powers of the Company under Sections 7(C) and 9 of this Trust
Agreement) of any insurance, retirement income or annuity policies or contracts,
(iii) any such powers of the Trustee or Independent Plan Administrator described
above may not be delegated, in whole or in part, after a Change in Control to
the Company or any affiliate of the Company, and (iv) the Trustee shall not be
required to liquidate any investments that were made pursuant to the directions
of the Investment Officer that are not Investment Grade Securities. Subject to
the foregoing provisions of Sections 6 and 7 of this Trust Agreement, the
Trustee shall have the following powers:

     A.   To invest and reinvest the Trust, without distinction between
     principal and income, in any form of domestic or foreign real or personal
     property, whether or not productive of income or consisting of wasting
     assets, provided that investments of the Plan shall be diversified so as to
     minimize the risk of large losses, unless under the circumstances it is
     clearly prudent not to do so;

     B.   To sell, convey, redeem, exchange, grant options for the purchase or
     exchange of, or otherwise dispose of, any real or personal property, other
     than an exchange of Trust assets to the Company as described in Section 6,
     at public or private sale, for cash or upon credit, with or without
     security, without obligation on the part of any person dealing with the
     Trustee to see to the application of the proceeds of, or to inquire into
     the propriety of, any such disposition;

     C.   To purchase and maintain, as owner, life insurance policies as
     provided in Section 9 of this Trust Agreement and only as directed by the
     Investment Officer of the Company prior to a Change in Control and the
     Independent Plan Administrator after a Change in Control;

     D.   To exercise, personally or by general or limited proxy or power of
     attorney, all voting and other rights appurtenant to any investment held in
     the Trust and to delegate discretionary power to exercise all or any such
     rights to trustees of a voting trust for any period of time;

                                      11
<PAGE>
 
     E.   To join in or oppose any reorganization, recapitalization,
     consolidation, merger or liquidation or any plan therefor, or any lease,
     mortgage or sale of the property of any organization the securities of
     which are held in the Trust; to pay from the Trust any assessments, charges
     or compensation specified in any plan of reorganization, recapitalization,
     consolidation, merger or liquidation; to deposit any property with any
     committee or depository; and to retain any property allotted to the Trust
     in any reorganization, recapitalization, consolidation, merger or
     liquidation;

     F.   To exercise or sell, personally or by general or limited power of
     attorney, any conversion, subscription or other rights, including the right
     to vote, appurtenant to any investment held in the Trust;

     G.   To borrow money for purposes of this Trust Agreement in any amount and
     upon any reasonable terms and conditions from any lender (other than the
     Trustee in its individual capacity), and to pledge or mortgage any property
     held in the Trust to secure the repayment of any such loan;

     H.   To compromise, settle or arbitrate any claim, debt, or obligation of
     or against the Trust; to enforce or abstain from enforcing any rights,
     claim, debt or obligation; and to abandon any property determined by it to
     be worthless;

     I.   To commence or defend suits or legal proceedings and to represent the
     Trust in all suits or legal proceedings; to settle, compromise or submit to
     arbitration any claims, debts or damages, due to or owing from the Trust;

     J.   To engage any legal counsel, including counsel to the Company, any
     enrolled actuary, or any other suitable agents; to consult with such
     counsel, enrolled actuary, or agents with respect to the construction of
     this Trust Agreement, the duties of the Trustee hereunder, the transactions
     contemplated by this Trust Agreement or any act which the Trustee proposes
     to take or omit; to rely upon the advice of such counsel, enrolled actuary
     or agents and to pay all reasonable fees, expenses and compensations of
     such counsel, actuary or agents; and

     K.   To organize and incorporate under the laws of any state one or more
     corporations (and to acquire an interest in any such corporation that it
     may have organized and incorporated) for the purpose of acquiring and
     holding title to any 

                                      12
<PAGE>
 
     property, interest or rights that the Trustee is authorized to acquire.

                                      13
<PAGE>
 
                                   SECTION 8

                  ADDITIONAL POWERS AND DUTIES OF THE TRUSTEE

     Following a Change in Control, should the Company attempt to enjoin any
benefit payment (other than for reasons of manifest error) that the Trustee has
been directed to make under the terms of this Trust Agreement, the Trustee shall
commence legal action to allow such payment.  The Trustee may withdraw from the
Trust assets any amounts it deems necessary to pay legal expenses, including
attorneys' fees, incurred in the course of such legal action.  Under no
circumstances shall the Trustee be required to make such payments for benefits
or expenses from any source other than the Trust.  Except as otherwise limited
by Section 6, the Trustee shall also have the following powers:

     A.   To cause any asset, real or personal, to be held in a corporate
     depository or federal book entry account system or registered in the
     Trustee's name or in the name of a nominee or in such other form as the
     Trustee deems best without disclosing the trust relationship; provided,
     however, that nothing contained in this Section shall be deemed to relieve
     the Trustee of any custodial responsibility allocated to it under this
     Trust Agreement;

     B.   To employ agents in the management of the Trust, including employees
     of the Company and its subsidiaries and affiliates prior to a Change in
     Control, provided, that the Trustee shall be responsible for the acts of
     such agents (other than acts of the United States Postal Service) as much
     as if they were acts of the Trustee;

     C.   To make, execute and deliver, as the Trustee, any deeds, leases,
     notes, bonds, guarantees, mortgages, conveyances, contracts, waivers,
     releases or other instruments in writing that the Trustee may deem
     necessary or desirable in the exercise of its powers under this Trust
     Agreement;

     D.   To transfer assets of the Trust to a successor Trustee as provided in
     Section 24 of this Trust Agreement;

     E.   To hold any portion of the Trust in cash pending investment, or for
     the payment of expenses or Benefits; and

     F.   To exercise, generally, any of the powers which an individual owner
     might exercise in connection with property, either real, personal or mixed
     held by the Trust and to do all

                                      14
<PAGE>
 
     other acts that the Trustee may deem necessary or proper to carry out any
     of the powers set forth in this Trust Agreement or otherwise in the best
     interests of the Trust.


                                 SECTION 9

                       INSURANCE POLICIES AND CONTRACTS
                                        
Prior to a Change in Control, the Company reserves the right to transfer life
insurance, retirement income or annuity policies or contracts, to the Trust,
regardless of the nature or type of such contract and regardless of the
Company's interest in, or power to direct the investments under, such policies
or contracts, or prior to a Change in Control, to direct the Trustee to purchase
any such policies or contracts, and following a Change in Control the
Independent Plan Administrator shall have the same powers regarding such
insurance policies and contracts. Any such policy or contract shall be an asset
of the Trust subject to the claims of the Company's creditors in the event of
insolvency, as specified in Sections 21.1 and 21.2 of this Trust Agreement. The
proceeds of any life insurance policy shall, upon the death of the insured, be
paid to the Trust. The Trustee shall be under no duty to question any direction
of the Company or the Independent Plan Administrator, to review the form of any
such policies or contracts or the selection of the issuer thereof, or to make
suggestions to the Company, the Independent Plan Administrator or to the issuer
thereof with respect to the form of such policies or contracts prior to a Change
in Control, or to question any such directions, to review such policies, forms
or selections or to make such suggestions to the Independent Plan Administrator
following a Change in Control. Prior to a Change in Control, the Company may
direct the Trustee to exercise the powers of the contract holder under any such
policies or contracts, and the Trustee shall exercise such powers only upon the
direction of the Company. Following a Change in Control, the Independent Plan
Administrator may direct the Trustee to exercise the powers of the contract
holder under any such policies or contracts and the Trustee shall exercise such
powers only upon direction of the Independent Plan Administrator.
Notwithstanding anything to the contrary contained in any Participating Plan,
the Trustee (i) shall be fully protected in acting in accordance with written
directions of the Company prior to a Change in Control and with the written
directions of the Independent Plan Administrator following a Change in Control,
and (ii) shall be under no liability for any loss of any kind that may result by
reason of any action taken or omitted by it in accordance with such direction of
the Company or the Independent Plan Administrator, or 

                                      15
<PAGE>
 
by reason of inaction in the absence of such written directions from the Company
or the Independent Plan Administrator. No insurance carrier shall for any
purpose be deemed a party to this Trust Agreement or be responsible for the
validity or sufficiency hereof. Notwithstanding the fact that it may have
knowledge of the terms of this Trust, the obligations of such insurance carrier
shall be measured and determined solely by the terms and conditions of the
policies or contracts issued by it. Any such insurance carrier shall not be
under any obligation to any person, partnership, corporation, trust or
association other than as stated in such policies or contracts.


                                  SECTION 10

                          PARTICIPATING PLAN RECORDS

     A separate written record of the accrued and vested benefit, as applicable,
for each Trust Beneficiary of each Participating Plan, based on a certified
listing provided by the Company prior to a Change in Control and by the
Independent Plan Administrator following a Change in Control, shall be
maintained. The Company or the Independent Plan Administrator, as applicable,
shall provide such certified listing at least once each calendar year to the
Trustee.


                                  SECTION 11

                                   VALUATION

     The Trust shall be revalued by the Trustee at current values, as determined
by the Trustee, as of the last business day of each calendar year and as of such
additional dates as the Trustee and Company shall determine to be appropriate
("Valuation"). The Company prior to a Change in Control and the Independent Plan
Administrator following a Change in Control annually shall provide a
certification of value for each life insurance, retirement income or annuity
policy or contract held as an asset of the Trust. The Trustee may rely upon the
certification of value received from the Company prior to a Change in Control or
the Independent Plan Administrator following a Change in Control for each such
policy or contract held as an asset of the Trust.

                                      16
<PAGE>
 
                                  SECTION 12

        PARTICIPANT RECORDS PRIOR TO AND FOLLOWING A CHANGE IN CONTROL

     Section 12.1.  In addition to the records maintained under Section 10, the
     -------------                                                             
Company shall maintain a separate written record that reflects for each Trust
Beneficiary, the Trust Beneficiary's vested benefits under each Participating
Plan and the portion of the Trust or Subtrust allocated to such Trust
Beneficiary (a "Participant Record").  Prior to a Change in Control, the Trustee
shall certify to the Company the results of each Valuation. Following receipt of
a Valuation, each Participant Record shall be equitably adjusted by the Company
to reflect its share of the income, expense, appreciation and depreciation since
the preceding Valuation date.  Such Participant Records shall be maintained
solely for record keeping purposes prior to a Change in Control, without any
legal entitlement of a Trust Beneficiary to amounts allocated to his or her
Participant Record.

     Section 12.2.  On and after a Change in Control, the Independent Plan
     -------------                                                        
Administrator (i) shall continue to maintain the Participant Records and the
records described in Section 10 of this Trust Agreement, (ii) shall thereafter
be solely responsible for the updating of such Participant Records and for
requesting the Trustee to make any additional Valuations the Trustee and
Independent Plan Administrator deem appropriate, and (iii) shall be entitled to
rely on the most recent certified listing delivered by the Company to the
Trustee prior to a Change in Control in the maintenance and updating of such
Participant Records following a Change in Control. No new Participant Records
may be established following a Change in Control.  The Independent Plan
Administrator may, but is not required to, rely on any certified listing
provided by the Company pursuant to Section 10 following a Change in Control.
Following a Change in Control, the sole source of Trust assets from which the
Independent Plan Administrator may direct that a Trust Beneficiary's Benefits be
paid to the extent the Trustee, rather than the Company, pays the Benefits shall
be that portion of the assets of the Trust or Subtrust allocated to the
Participant Record of such Trust Beneficiary.


                                  SECTION 13
                                        
                               TRUSTEE ACCOUNTS

     Within 120 days after the close of each fiscal year of the Trust and any
other period agreed upon by the Trustee and the Company, and within ninety (90)
days of the date of the removal or 

                                      17
<PAGE>
 
resignation of the Trustee, the Trustee shall file with the Company a written
account ("Trustee Account") setting forth all investments, receipts,
disbursements, withdrawals and other transactions effected by it during the
period from the date of its last such Trustee Account and a list of the assets
of the Trust at the close of such period. Such Trustee Account may be in the
form of monthly or quarterly statements which taken together reflect the matters
set forth in the preceding sentence. As between the Company and the Trustee, the
Trustee shall be forever released and discharged from all liability with respect
to the propriety of acts and transactions shown in such Trustee Account
following a Change in Control, and shall be forever released and discharged from
all liability with respect to the propriety of acts and transactions shown in
such Trustee Account prior to a Change in Control except with respect to any
such act or transaction as to which the Company shall, within a 90-day period of
receipt of the Trust Account, file written objections with the Trustee and
except that no such accounting shall foreclose any liability of the Trustee to
the Company arising under Section 23.3 of this Trust Agreement.


                                  SECTION 14

                              INVESTMENT OF CASH

     Prior to a Change in Control, the Trustee shall keep any cash held
hereunder from time to time on deposit in its own banking department or
elsewhere as the Trustee elects, consistent with instructions provided by the
Investment Officer of the Company regarding specific types of permissible
investments and permissible depositories. Prior to a Change in Control, in the
absence of contrary instructions from the Investment Officer, and following a
Change in Control, in the absence of contrary instructions from the Independent
Plan Administrator regarding insurance, retirement income or annuity policies or
contracts, and anything herein to the contrary notwithstanding, the Trustee,
without obtaining any prior approvals, may at its discretion invest cash
balances held by the Trustee from time to time in deposits in its own banking
department, in short-term cash equivalents having ready marketability, including
but not limited to U.S. Treasury bills, commercial paper rated not less than
A1/P1 (including such forms thereof as may be available through the Trustee's
own trust department), certificates of deposit, and similar type securities,
having a maturity of 18 months or less, including participation in common or
collective funds composed thereof. Prior to a Change in Control, the Trustee may
sell any such short-term investments as may be necessary to carry out the
instructions of the Investment Officer of the Company regarding

                                      18
<PAGE>
 
more permanent type investments or to permit any distributions or transfers
directed hereunder. The Trustee may make any such sales it deems appropriate
following a Change in Control, including sales necessary to carry out the
instructions of the Independent Plan Administrator.


                                  SECTION 15

                            PAYMENTS BY THE TRUSTEE


     Section 15.1.  The establishment of the Trust and the payment or delivery
     -------------                                                            
to the Trustee of money or other property acceptable to the Trustee shall not
vest in any Trust Beneficiary any right, title or interest in or to any assets
of the Trust.

     Section 15.2.  The Trustee shall be directed as to the amount, timing, and
     -------------                                                              
form of benefits to be paid to any Trust Beneficiary. Prior to a Change in
Control, the Company shall so direct the Trustee and by giving such directions
shall be deemed to warrant their propriety. Following a Change in Control, the
Independent Plan Administrator shall so direct the Trustee and by giving such
directions, shall be deemed to warrant their propriety.

     Section 15.3.  The Trustee shall withhold all or any part of any payment
     -------------                                                            
for the payment of any tax liability and the Trustee shall discharge such
liability as and when directed by the Company prior to a Change in Control and
by the Independent Plan Administrator following a Change in Control. All
withholding, related filings and reports are the responsibility of the Company.

     Section 15.4.  The Company intends to make benefit payments from its assets
     -------------
as it deems appropriate, in its sole discretion, provided, that, notwithstanding
this intent, if the Trust is not sufficient, before or after a Change in
Control, to make one or more payments of Benefits to the Trust Beneficiaries
under the relevant Participating Plan, the Company shall make the balance of
each such payment as it falls due.

     Section 15.5.  Except as otherwise provided herein, in the event of any
     -------------
final determination by the Internal Revenue Service or a court of competent
jurisdiction which determination is not appealable or the time for appeal or
protest of which has expired, or the receipt by the Trustee of an unqualified
opinion of tax counsel selected by the Trustee or Company, which determination
determines, or which opinion concludes, that any Trust Beneficiary is subject to
federal income taxation on amounts held in trust to pay Benefits hereunder prior
to the distribution to the Trust Beneficiary of such Benefits, the Trustee
shall, on receipt by the 

                                      19
<PAGE>
 
Trustee of such opinion or actual notice of such determination, pay to such
Trust Beneficiary the portion of the Trust corpus includible in such Trust
Beneficiary's federal gross income, and the Trust Beneficiary's Benefits shall
be canceled to the extent of such payment, provided that the amount, form and
timing of such payments and the amount and method of such cancellation shall be
as directed by the Company prior to a Change in Control and by the Independent
Plan Administrator following a Change in Control.


                                  SECTION 16

                      DETERMINATION OF CHANGE IN CONTROL

     The Company shall immediately notify the Trustee in writing of the
occurrence of a Change in Control as the result of any event specified in
Section 3.1 of this Trust Agreement. If the Trust Department of the Trustee
receives written notice from a third party (including the Company's outside
auditors) of the alleged occurrence of a Change in Control as the result of any
event specified in Section 3.1 of this Trust Agreement, the Trustee shall
request the Company to confirm or deny such occurrence and the Company shall
make such confirmation or denial within forty-five (45) days following receipt
of the Trustee's request. In order to deny that a Change in Control as the
result of any event specified in Section 3.1 of this Trust Agreement has
occurred, the Company shall provide with its notice a certificate, in a form
reasonably satisfactory to the Trustee, from an independent accounting firm,
which firm may be the accounting firm engaged by the Company to be its outside
auditors, certifying that a Change in Control as the result of an event
specified in Section 3.1 of this Trust Agreement has not occurred. Pending the
Company's response, the Trustee shall not repay, pursuant to Section 5 of this
Trust Agreement, any assets of the Trust to the Company and no new Trust
Beneficiaries may be added to the Trust. The Trustee shall be entitled to
conclusively rely upon such confirmation or denial.


                                  SECTION 17

                    TRUSTEE COMPENSATION AND TRUST EXPENSES

     The Trustee shall be paid such reasonable compensation for its service as
Trustee as shall from time to time be agreed upon by Company and Trustee.  This
compensation and all expenses incurred by the Trustee in the management and
protection of the Trust, including administration, accounting and legal fees,
shall 

                                      20
<PAGE>
 
be reimbursed by the Company within 30 days after the Company's receipt of a
bill from the Trustee for any fees and expenses paid from the Trust assets. To
the extent the Company fails to

                                      21
<PAGE>
 
reimburse the Trustee, this compensation and extraordinary and non-recurring
expenses shall be charged by the Trustee against the Trust.


                                  SECTION 18

                          PAYMENT OF TAXES BY TRUSTEE

     Prior to a Change in Control, to the extent that any taxes levied or
assessed upon the Trust are not paid by the Company, the Trustee shall pay such
taxes out of the Trust as directed by the Company. The Trustee shall, if
requested by the Company prior to a Change in Control, and solely in its
discretion following a Change in Control, contest the validity or amount of any
tax assessment, claim or demand respecting the Trust or any part thereof. The
Company itself may contest the validity of any such taxes prior to a Change in
Control.


                                  SECTION 19

                             CUSTODIANS AND AGENTS

     When so instructed by the Company prior to a Change in Control with respect
to Trust assets for which the Company has investment responsibility, and at the
Trustee's sole discretion with respect to assets for which the Trustee has
investment responsibility, the Trustee shall deposit any assets held by it with
a custodian, which may not include the Company or an affiliate of the Company,
and the Company shall hold harmless and defend the Trustee against any liability
arising or asserted to arise out of the Trustee's compliance with directions
under this Section 19 of this Trust Agreement.


                                  SECTION 20

                        LIABILITY FOR BENEFIT PAYMENTS

     The Company shall remain primarily liable to pay Benefits under the
Participating Plans.  However, the Company's liability under the Participating
Plans shall be reduced or offset to the extent Benefit payments are made from
the Trust.

                                      22
<PAGE>
 
                                  SECTION 21

                              COMPANY INSOLVENCY


     Section 21.1.  The Company shall have the duty to inform the Trustee in
     -------------                                                          
writing if the Company becomes insolvent, as hereinafter defined.  When so
informed, the Trustee shall immediately discontinue payments of Benefits to
Trust Beneficiaries, and shall hold the assets of the Trust for the benefit of
the Company's general creditors.  The Company shall be considered "insolvent"
for purposes of this Trust Agreement in the event of the following:

     A.   the Company's inability to pay debts as they mature;

     B.   a general assignment for the benefit of the Company's creditors;

     C.   the voluntary commencement by the Company of any proceeding under
     Title 11 of the United States Code or any other law of any jurisdiction for
     the relief, liquidation or rehabilitation of debtors (all of which
     proceedings are hereinafter collectively referred to as "Insolvency
     Proceedings");

     D.   the making of an admission by the Company of any of the material
     allegations of, or consenting to, or acquiescing in, a petition,
     application, motion or complaint commencing an Insolvency Proceeding or the
     seeking by the Company of the appointment of, or the taking of possession
     by, a receiver, custodian, trustee, liquidator or similar official of or
     for it or for a substantial part of its assets;

     E.   the involuntary commencement of an Insolvency Proceeding against the
     Company which is not fully stayed, timely controverted or dismissed within
     one hundred twenty (120) days after the filing thereof; or

     F.   the appointment of, or the taking of possession by, a receiver,
     custodian, trustee, liquidator or similar official of or for the Company or
     of or for all or substantially all of its assets.

     If the Trust Department of the Trustee receives a written allegation from a
third party that the Company has become insolvent, the Trustee shall appoint an
independent accounting firm to determine within sixty (60) days whether the
Company is insolvent under the terms of this Trust Agreement and, pending such
determination, the Trustee shall discontinue payments of 

                                      23
<PAGE>
 
Benefits to Trust Beneficiaries, shall hold the Trust assets for the benefit of
the Company's general creditors, and shall resume payments of Benefits to Trust
Beneficiaries only after such independent accounting firm, has determined that
the Company is not insolvent (or is no longer insolvent, assuming the
independent accounting firm initially determined the Company to be insolvent) or
after receipt of an order of a court of competent jurisdiction. In making its
determination, such independent accounting firm, may rely on a letter from the
Company's Controller, or its Independent Auditors, or on relevant information
concerning the Company's solvency which has been furnished to the Trustee by any
other person. Notwithstanding any other provision of this Trust Agreement, the
Trustee shall be responsible only for the prudent selection of the independent
accounting firm, and shall conclusively rely on such firm's determination.
Nothing in this Trust Agreement shall in any way enlarge or diminish the rights
of the Trust Beneficiaries in the event the Company is insolvent to pursue their
rights as general creditors of the Company with respect to their Benefits or
otherwise.

     Section 21.2.  In the case of the Company's notification of insolvency or
     -------------                                                              
the determination of insolvency by an independent accounting firm as provided in
Section 21.1 of this Trust Agreement, the Trustee shall deliver any
undistributed principal and income in the Trust to satisfy claims of the
Company's general creditors as directed by a court of competent jurisdiction.

     Section 21.3.  If the Trustee discontinues payments of Benefits from the
     -------------
Trust pursuant to Section 21.1 of this Trust Agreement and subsequently resumes
such payments, the first payment to each Trust Beneficiary following such
discontinuance shall include the aggregate amount of all payments which would
have been made to such Trust Beneficiary in accordance with the relevant
Participating Plan during the period of such discontinuance, less the aggregate
amount of payments of Benefits made to such Trust Beneficiary by the Company
during any such period of discontinuance. Prior to a Change in Control, the
Trustee shall be directed as to the amount, timing, form and payee of all such
payments by the Company. Following a Change in Control, the Trustee shall be so
directed by the Independent Plan Administrator.


                                  SECTION 22

                TRUSTEE RESPONSIBILITY FOR PLAN ADMINISTRATION
               AND TRUST RECORD KEEPING AFTER CHANGE IN CONTROL

     Section 22.1.  Following a Change in Control, the Independent 
     -------------                                                     

                                      24
<PAGE>
 
Plan Administrator shall assume full responsibility for the interpretation and
application of the Participating Plans' provisions and authorization for the
payment of benefits as such provisions relate to payments to be made from the
Trust. The Independent Plan Administrator shall have full discretion with
respect to the performance of such duties and shall not be required to follow
any direction of the Company, any successor thereto, or any other entity in
performing such duties.

     Section 22.2.  Following a Change in Control, the Trustee shall maintain
                                                                 
all records dealing with the Trust and its investments; provided, however, that
the responsibility for the maintenance of Plan records relating to Trust
Beneficiaries, Participant Records and all other plan administration shall be
the sole responsibility of the Independent Plan Administrator. The Trustee shall
have no responsibility for the maintenance of the Participating Plan.


                                  SECTION 23

                       TRUSTEE STANDARDS OF PERFORMANCE
                             AND INDEMNIFICATIONS

     Section 23.1.  Trustee shall perform all of its functions hereunder (i)
     -------------
with the care, skill, prudence, and diligence which under the circumstances then
prevailing a prudent man acting in a like capacity and familiar with such
matters would use in the conduct of an enterprise of a like character and with
like aims, or (ii) in accordance with such other standard as may be required
from time to time by law, and shall not be liable for any conduct on its part
(including reliance on advice of counsel) which conforms to that standard.

     Section 23.2.  The Company (which has the authority to do so under the laws
     -------------
of its state of incorporation) shall indemnify the Trustee and defend it and
hold it harmless from and against any and all direct liabilities, losses,
claims, suits or expenses (including attorney's fees) of whatsoever kind and
nature which may be imposed upon, asserted against or incurred by the Trustee at
any time by reason of its carrying out its responsibilities or providing
services hereunder or by reason of any act or failure to act under this Trust
Agreement, except to the extent that any such liability, loss, claim, suit or
expense arises directly from the Trustee's gross negligence or willful
misconduct in the performance of responsibilities specifically allocated to it
under this Trust Agreement. The provisions of this Section 23.2 shall survive
the termination of this Trust Agreement.

                                      25
<PAGE>
 
     Section 23.3.  The Trustee (which has the authority to do so under the laws
     -------------
of its state of incorporation) shall indemnify the Company and defend it and
hold it harmless from and against any and all direct liabilities, losses,
claims, suits or expenses (including attorney's fees) of whatsoever kind and
nature which may be imposed upon, asserted against or incurred by the Company at
any time directly by reason of the Trustee's gross negligence or willful
misconduct in the performance of responsibilities specifically allocated to it
under this Trust Agreement. The provisions of this Section 23.3 shall survive
the termination of this Trust Agreement.


                                  SECTION 24

                      REMOVAL AND RESIGNATION OF TRUSTEE

     Prior to a Change in Control, Trustee may be removed by the Company at any
time upon not less than thirty (30) days' written notice.  The Trustee may
resign at any time prior to or following a Change in Control, upon not less than
ninety (90) days' written notice.  In either case, such notice may be wholly or
partially waived by the party to whom it is due.  Upon Trustee's removal or
resignation prior to a Change in Control, the Company shall appoint a successor
Trustee, who shall have no responsibility for the acts or omissions of any
predecessor trustee, and upon the Trustee's resignation following a Change in
Control the Trustee shall petition a court of competent jurisdiction to name a
successor trustee which in no event may be the Company or an affiliate of the
Company or a successor thereto; provided, however, that the successor trustee in
either case shall have the same powers and duties as those conferred upon the
Trustee hereunder, and upon acceptance of such appointment by the successor
Trustee, the Trustee shall assign, transfer and pay over to such successor
Trustee the Trusts and properties then constituting the Trust.  If the Company
fails within a reasonable time to name a successor Trustee or otherwise direct
proper disbursement of the Trust prior to a Change in Control, the Trustee may
apply to any court of competent jurisdiction for appropriate relief.  The
Trustee may in any event reserve such reasonable sum of money as it may deem
advisable, to provide for any charges against the Trust for which it may be
liable, and for payment of its fees and expenses in connection with the
settlement of its account or otherwise.  Any balance of such reserve remaining
after the payment of such fees and expenses shall be paid over as aforesaid.

                                      26
<PAGE>
 
                                  SECTION 25

                  TERMINATION OF PARTICIPATING PLAN OR PLANS

     If a Participating Plan is wholly or partially terminated prior to a Change
in Control, the Trustee shall disburse the portion of the Trust affected by the
termination as directed by the Company. If a Participating Plan is wholly or
partially terminated following a Change in Control, Trustee shall disburse the
portion of the Trust affected by the termination as directed by the Independent
Plan Administrator.


                                  SECTION 26

                       RIGHTS OF COMPANY TO TRUST ASSETS

     Section 26.1.  Prior to a Change in Control, the Company shall have no
     -------------
right, title or interest in the Trust, nor shall any part of the Trust revert to
or be repaid to the Company, until all benefits due under all Participating
Plans have been paid pursuant to Section 25 of this Trust Agreement, unless, at
any time, there is a determination that the assets of the Trust have a value
exceeding one hundred twenty-five percent (125%) of the lump sum actuarial
equivalent value of accrued but unpaid benefits under one or more of the
Participating Plans pursuant to Section 5 of this Trust Agreement. The amount of
such excess in the particular Plan may be repaid to the Company, upon direction
of the Company pursuant to the provisions of Section 5.

     Section 26.2.  On and after the occurrence of a Change in Control, the
     -------------
Company shall have no right, title or interest in the Trust, nor shall any part
of the Trust revert to or be repaid to the Company.


                                  SECTION 27

                              AMENDMENTS OF TRUST

     Section 27.1.  Prior to a Change in Control, the Company may amend this
     -------------
Trust Agreement by an instrument in writing signed by an authorized officer of
the Company provided that no such amendment shall make this Trust revocable or
divert any part of the Trust to purposes other than payment of Benefits,
payments under Sections 2 or 5 of this Trust Agreement, or defrayal of
reasonable expenses of administering the Participating Plans. The Trustee's
consent shall be required for any amendment affecting  

                                      27
<PAGE>
 
its duties, responsibilities or rights. No amendment affecting the duties,
responsibilities or rights of the Trustee shall take effect until thirty (30)
days after a copy of said amendment is furnished to the Trustee or, if the
Trustee gives notice of resignation within such 30 day period, until the
resignation becomes effective, provided, that the Trustee may, in writing, waive
the 30 day requirement.

     Section 27.2.  Following a Change in Control, this Trust Agreement may not
     -------------
be amended.


                                  SECTION 28

                             TERMINATION OF TRUST

     Section 28.1.  Prior to a Change in Control, the Company may not terminate
this Trust for reasons other than those provided in (A) and (B) below.
Otherwise, this Trust shall be irrevocable. Removal or resignation of a Trustee
pursuant to Section 24 shall not be deemed a termination of this Trust
Agreement.

     A.   This Trust will terminate if a federal court determines, after
     exhaustion of all appeals, that the Trust causes any of the Participating
     Plans to cease to be "unfunded" under the provisions of ERISA.

     B.   The Company may terminate this Trust if the Company determines, based
     on advice of legal counsel satisfactory to the Trustee, that there is a
     significant risk that the Trust would cause any of the Participating Plans
     to be cease to be unfunded under ERISA prior to actual payment of any
     Benefits. For purposes of this section, "significant risk" shall be based
     on (i) judicial authority or opinion of the U.S. Department of Labor,
     Treasury Department or Internal Revenue Service or (ii) a required
     amendment under ERISA or the Internal Revenue Code, which failure to amend
     could result in significant penalty to the Company.

     If this Trust Agreement is terminated under (A) or (B), the Trust assets
shall be distributed, in accordance with the Company's written direction, as
follows:

     (i)  If the Company determines it is possible to create a new trust which
     does not result in a Trust Beneficiary's constructive receipt of Benefits
     under any Participating Plan or which will retain the Participating Plan's
     status as "unfunded" under ERISA, Trust assets shall be transferred to the
     new trust.  The terms of the new trust shall be similar 

                                      28
<PAGE>
 
     in all other respects to this Trust.

     (ii)  If the Company determines that it is not possible to create a new
     trust, then the assets shall be distributed according to the allocation to
     the Trust Beneficiaries under Section 12.1.

     When all payments which have or may become payable pursuant to the terms of
this Trust have been made or the Trust has been exhausted pursuant to a
termination of this Trust Agreement under (A) or (B) above prior to a Change in
Control, the Trustee shall pay all remaining assets to the Company upon the
Company's certification of payments, subject to the Trustee's right to reserve
such amounts it reasonably determines to be necessary to pay outstanding and
accrued charges against the Trust.

     Section 28.2.  On and after the occurrence of a Change in Control, the
     -------------                                                         
Independent Plan Administrator may in its discretion direct the Trustee to
terminate this Trust Agreement and in conjunction therewith the Independent Plan
Administrator shall direct the Trustee as to the names of the Trust
Beneficiaries who are to receive payments and the time, amount and form of
payment of Benefits and any remaining assets of the Trust, subject to the
Trustee's right to reserve such amounts the Trustee determines necessary for
outstanding and accrued charges against the Trust.


                                  SECTION 29

                                  SUCCESSORS

     Any successor in interest to the Trustee shall automatically become Trustee
under this Trust Agreement.


                                  SECTION 30
                                        
                                COMMUNICATIONS

     Any communications (including notices, instructions, or directions)
required or permitted hereunder to be given by the Company shall be given in
writing addressed to the Trustee and signed by an officer of the Company or
other person or persons whom the Company notifies the Trustee are from time to
time authorized to sign such communications, and the Company warrants that all
communications given pursuant to this Section 30 may be relied upon by the
Trustee. The Company shall furnish the Trustee specimen signatures of all
persons authorized to sign 

                                      29
<PAGE>
 
communications to the Trustee.


                                  SECTION 31

                            UNCLAIMED DISTRIBUTIONS

     If any benefit payment mailed by regular U.S. Mail to the last address of
the payee furnished by the Company is returned unclaimed, the Trustee shall so
notify the Company and shall discontinue further payments to such payee until it
receives further instructions of the Company.


                                  SECTION 32

                          PROHIBITION OF ASSIGNMENTS

     Except insofar as applicable law may otherwise require and subject to
Sections 1, 2, 21.1 and 21.2 of this Trust Agreement, (i) no amount payable to
or in respect of any Trust Beneficiary at any time under the Trust shall be
subject in any manner to direction by anticipation, sale, transfer, assignment,
bankruptcy, pledge, attachment, or charge of any kind, and any attempt to so
alienate, sell, transfer, assign, pledge, attach, change or otherwise encumber
any such amount, whether presently or thereafter payable, shall be void and (ii)
the Trust shall in no manner be liable for or subject to the debts or
liabilities of any Trust Beneficiary. No amount held under this Trust Agreement
shall be subject to voluntary or involuntary alienation.


                                  SECTION 33
                                        
                                 GOVERNING LAW

     This Trust Agreement shall be governed by and construed under the laws of
the State of Massachusetts in all respects.


                                  SECTION 34

                                   EXECUTION

     This Trust Agreement may be executed in counterparts, each of which shall
be an original although the others are not produced.

                                      30
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Trust Agreement to be
executed as of the date first written above.



ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY



_________________________________       By:_____________________________________
Assistant Secretary                        Richard W. Park
                                           Vice President, Human Resources


ATTEST:                                 STATE STREET BANK AND TRUST
                                        COMPANY



_________________________________       By:_____________________________________

                                      31
<PAGE>
 
                                  APPENDIX A
                                      TO
                        LYONDELL PETROCHEMICAL COMPANY
                     NON-EMPLOYEE DIRECTORS BENEFIT PLANS
                                TRUST AGREEMENT


Lyondell Petrochemical Company Retirement Plan for Non-Employee Directors

Lyondell Petrochemical Company Elective Deferral Plan for Non-Employee Directors

                                      32

<PAGE>
 
                                                                EXHIBIT 10.14(a)

                              INSTRUMENT AMENDING

                        LYONDELL PETROCHEMICAL COMPANY

                     NON-EMPLOYEE DIRECTORS BENEFIT PLANS

                                TRUST AGREEMENT
                                        

Lyondell Petrochemical Company hereby amends, effective August 1, 1997, the
Lyondell Petrochemical Company Non-Employee Directors Benefit Plans Trust
Agreement, as follows:

Section 3, CHANGE IN CONTROL, Section 3.2., "Definition of Change in Control" is
revised in its entirety to read as follows:

          SECTION 3.2.  Definition of "Change in Control". For purposes of this
Trust Agreement, a "Change in Control" shall be deemed to have occurred as of
the date that one or more of the following occurs:

     A.   Individuals who, as of the date hereof, constitute the entire Board of
     Directors of the Company ("Incumbent Directors") cease for any reason to
     constitute at least a majority of the Board; provided, however, that any
                                                  --------  -------          
     individual becoming a director subsequent to the date hereof whose
     election, or nomination for election by the Company's shareholders, was
     approved by a vote of at least a majority of the then Incumbent Directors
     shall be considered as though such individual was an Incumbent Director,
     but excluding, for this purpose any such individual whose initial
     assumption of office occurs as a result of either an actual or threatened
     election contest, as such terms are used in Rule 14a-11 under the Exchange
     Act or other actual or threatened solicitation of proxies or consents by or
     on behalf of any Person (as defined below) other than the Board; provided,
                                                                      -------- 
     further, that in the event ARCO at any 
     -------
<PAGE>
 
     time determines to achieve minority representation on the Company's Board
     of Directors approximately equal to its then ownership percentage of the
     Company's common stock, its implementation of such determination through
     the election of ARCO employees as directors of the Company shall not be
     deemed to be a Change in Control and such ARCO employees shall constitute
     Incumbent Directors;

     B.   The stockholders of the Company shall approve (1) any merger,
     consolidation or recapitalization of the Company (or, if the capital stock
     of the Company is affected, any subsidiary of the Company), or any sale,
     lease, or other transfer (in one transaction or a series of transactions
     contemplated or arranged by any party as a single plan) of all or
     substantially all of the assets of the Company (each of the foregoing being
     an "Acquisition Transaction") where (i) the shareholders of the Company
     immediately prior to such Acquisition Transaction would not immediately
     after such Acquisition Transaction beneficially own, directly or
     indirectly, shares or other ownership interests representing in the
     aggregate eighty percent (80%) or more of (a) the then outstanding common
     stock or other equity interests of the corporation or other entity
     surviving or resulting from such merger, consolidation or recapitalization
     or acquiring such assets of the Company, as the case may be (the "Surviving
     Entity") (or of its ultimate parent corporation or other entity, if any),
     and (b) the Combined Voting Power of the then outstanding Voting Securities
     of the Surviving Entity (or of its ultimate parent corporation or other
     entity, if any) or (ii) the Incumbent Directors at the time of the initial
     approval of such Acquisition Transaction would not immediately after such
     Acquisition Transaction constitute a majority of the Board of Directors, or
     similar managing group, of the Surviving Entity (or of its ultimate parent
     corporation or other entity, if any), or (2) any plan or proposal for the
     liquidation or dissolution of the Company;

     C.   Any Person except for ARCO shall be or become the beneficial owner (as
     defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or
     indirectly, of securities of the Company representing in the aggregate more
     than twenty percent (20%) of either (1) the then outstanding shares of
     common stock of the Company ("Common Shares") or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company; provided,
                                                                     -------- 
     however, that notwithstanding the foregoing, a "Change of Control" shall
     -------                                                                 
     not be deemed to have occurred for purposes of this Subsection (C):

          (i)  Solely as a result of an acquisition of securities by the Company
          which, by reducing the number of Common Shares or other Voting
          Securities outstanding, increases (a) the proportionate number of
          Common Shares beneficially owned by any Person to more than twenty
          percent (20%) of the Common Shares then outstanding, or (b) the
          proportionate voting power represented by the Voting Securities
          beneficially owned by any Person to more than twenty percent (20%) of

                                       2
<PAGE>
 
          the Combined Voting Power of all then outstanding Voting Securities;
          or

          (ii) Solely as a result of an acquisition of securities directly from
          the Company except for any conversion of a security that was not
          acquired directly from the Company,

     provided, further, that if any Person referred to in paragraph (i) or (ii)
     --------  -------
     of this Subsection (C) shall thereafter become the beneficial owner of any
     additional Common Shares or other Voting Securities of the Company (other
     than pursuant to a stock split, stock dividend or similar transaction),
     then a "Change of Control" shall be deemed to have occurred for purposes of
     this Subsection (C); or

     D.   ARCO shall become the owner, directly or indirectly, of securities of
     the Company representing in the aggregate more than fifty percent (50%) of
     either (1) the then outstanding Common Shares or (2) the Combined Voting
     Power of all then outstanding Voting Securities of the Company except as
     the result of an acquisition of securities by the Company which, by
     reducing the number of Common Shares or other Voting Securities
     outstanding, increases (x) the proportionate number of Common Shares
     beneficially owned by ARCO to more than fifty percent (50%) of the Common
     Shares then outstanding, or (y) the proportionate voting power represented
     by the Voting Securities beneficially owned by ARCO to more than fifty
     percent (50%) of the Combined Voting Power of all then outstanding Voting
     Securities; provided, however, that if thereafter ARCO becomes the
                 --------  -------                                     
     beneficial owner of any additional Common Shares or other Voting Securities
     of the Company (other than pursuant to a stock split, stock dividend or
     similar transaction) the exception provided above shall no longer apply;
     provided, further, that for purposes of this Subsection (D), neither record
     --------  -------                                                          
     ownership of common stock of the Company by the Trustee for ARCO's 401(a)
     qualified plans nor beneficial ownership of common stock of the Company by
     any of ARCO's directors for their personal account shall be deemed to
     constitute "indirect" ownership of common stock of the Company by ARCO;
     provided, further, that notwithstanding any contrary provision of this
     --------  -------                                                     
     Agreement, no Change in Control shall be deemed to have occurred pursuant
     to this Subsection (D) if as a result of an inadvertent act ARCO becomes
     the owner, directly or indirectly, of additional Common Shares or Voting
     Securities and such securities are sold or otherwise disposed of by ARCO
     within 30 days after ARCO discovers, or is notified by the Company as to,
     the potential Change of Control resulting from such ownership, so that, as
     a result of such subsequent sale or other disposition by ARCO, no Change in
     Control would otherwise be deemed to have occurred pursuant to the terms
     (excluding this proviso) of this Subsection (D).

     Notwithstanding any of the foregoing, no Change in Control shall be deemed
     to have occurred as a result solely of (1) the registration by ARCO of the

                                       3
<PAGE>
 
     Exchangeable Notes pursuant to the Registration Statement, (2) the issuance
     and sale by ARCO of the Exchangeable Notes to the underwriters in
     accordance with the Registration Statement, (3) prior to the maturity of
     the Exchangeable Notes, purchases and sales of the Exchangeable Notes, or
     (4) a transaction in which assets of the Company are contributed to an
     entity pursuant to the creation of a partnership under the terms of certain
     agreements authorized by the Incumbent Directors on July 25, 1997.


IN WITNESS WHEREOF, the undersigned, being duly authorized on behalf of the
Company, has executed this instrument on this __________ day of August, 1997.



ATTEST:                                 LYONDELL PETROCHEMICAL COMPANY



BY: ________________________            BY:___________________________
    Assistant Secretary                      Jeffrey R. Pendergraft
                                             Senior Vice President, Secretary

                                       4

<PAGE>
 
                                                                EXHIBIT 10.17(b)


                                AMENDMENT NO. 2
                                       TO
                              AMENDED AND RESTATED
                    LIMITED LIABILITY COMPANY REGULATIONS OF

                      LYONDELL-CITGO REFINING COMPANY LTD.
                                (THE "COMPANY")


     Amendment No. 2 (the "Amendment") to the Amended and Restated Limited
Liability Company Regulations (the "Regulations") of LYONDELL-CITGO Refining
Company Ltd. (the "Company") is effective, August 28, 1995.  All terms defined
in the Regulations are used herein with the meanings provided in the
Regulations.

     1. Section 9.3(A) of the Regulations is hereby amended to read hereafter in
its entirety as follows:

     9.3  Approval of Budgets.

          (A)  Each budget shall be approved by Owners Committee Action. The
               budgets for the Company's first fiscal year ending December 31,
               1993 shall be approved by Owners committee Action effective as of
               the date of these Regulations. Prior to November 15 of each
               fiscal year, the CEO shall prepare and submit to the Owners
               Committee for approval each of the budgets for the ensuing fiscal
               year (and, as appropriate, for subsequent periods), and on or
               before December 1, the Owners Committee shall by Owners Committee
               Action approve, with such modifications as it considers
               appropriate, each such budget.

     2.  Except as set forth above the Regulations remain unmodified, and, as
amended above, the Regulations remain in full force and effect.

<PAGE>
 
                                                                EXHIBIT 10.17(c)


                                AMENDMENT NO. 3
                                       TO
                              AMENDED AND RESTATED
                    LIMITED LIABILITY COMPANY REGULATIONS OF

                      LYONDELL-CITGO REFINING COMPANY LTD.
                                        

     Amendment No. 3 (the "Amendment") to the Amended and Restated Limited
Liability Company Regulations (the "Regulations") of LYONDELL-CITFGO Refining
Company Ltd. (the "Company") is effective, by unanimous written consent of the
Representatives of the Owners Committee in accordance with Section 3.4(E) of the
Regulations, as of January 27, 1997.  All terms defined in the Regulations are
used herein with the meanings provided in the Regulations.

     1. Section 6.3 of the Regulations is hereby amended to read hereafter in
its entirety as follows:

     6.3  Additional Refinery Expansion Project Funding. In the event that
          additional funds are required under Section 10 for the Refinery
          Expansion Project, then in any such event such funds shall be provided
          equally by the Owners unless otherwise mutually agreed. Except as
          provided herein below, the amounts to be funded by COwner shall be
          funded with capital contributions and the amounts to be funded by
          LOwner shall be funded by LOwner loans, as provided in Section
          6.4.(D). The amounts in excess of the Cost Ceiling to be funded by
          COwner shall be funded (i) with capital contributions up to
          $25,000,000 and (ii) for any amounts required beyond $25,000,000, at
          COwner's option, either capital contributions or COwner loans (the
          terms of which shall be, subject to Section 13.11, as set forth on
          Exhibit 6.4.(D).

     2. Except as set forth above, the Regulations remain unmodified, and as
amended above, the Regulations remain in full force and effect.

<PAGE>
 
                                                                   EXHIBIT 10.25

 



                         MASTER TRANSACTION AGREEMENT

                                    BETWEEN

                            EQUISTAR CHEMICALS, LP,

                             OCCIDENTAL PETROLEUM
                                 CORPORATION,

                        LYONDELL PETROCHEMICAL COMPANY
 
                                      AND
 -----------------------------------------------------------------------------
                           MILLENNIUM CHEMICALS INC.
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE> 
<CAPTION> 

 
                                                                                    PAGE
<S>         <C>                                                                      <C>     
SECTION 1   RELATED AGREEMENTS AND CLOSING......................................     2
 1.1        Tier 1 Related Agreements...........................................     2
 1.2        Tier 2 Related Agreements...........................................     2
 1.3        Closing Date........................................................     2
 1.4        Partnership Long-term Debt..........................................     2
 1.5        Closing Transactions................................................     2
 1.6        Merger Agreements...................................................     3
 1.7        Repayment of the Lyondell Note......................................     3
 
SECTION 2   REPRESENTATIONS AND WARRANTIES......................................     3
 2.1        Representations and Warranties of the Partnership...................     3
 2.2        Representations and Warranties of Occidental........................     8
 2.3        Representations and Warranties of Lyondell..........................    11
 2.4        Representations and Warranties of Millennium........................    13
 
SECTION 3   ADDITIONAL AGREEMENTS...............................................    15
 3.1        Access to Information...............................................    15
 3.2        Conduct of the Occidental Subject Business Pending the Closing Date.    15
 3.3        Conduct of the Partnership Subject Business Pending the Closing Date    16
 3.4        Further Actions.....................................................    18
 3.5        Notifications.......................................................    20
 3.6        Employee Matters....................................................    20
 3.7        Partnership Unanimous Consent Items.................................    20
 3.8        Closing Amendments Certificate......................................    20
 
SECTION 4   CONDITIONS TO CLOSING...............................................    21
 4.1        Conditions Precedent to Obligations of All Parties..................    21
            (a)  No Injunction, etc.............................................    21
            (b)  Tier 2 Related Agreements......................................    21
            (c)  Government Licenses and Consents...............................    21
            (d)  HSR Act........................................................    21
            (e)  Amended Bank Credit Facility...................................    22
 4.2        Conditions Precedent to Obligations of the Partnership..............    22
            (a)  Closing Amendments Certificate.................................    22
            (b)  Accuracy of Representations and Warranties.....................    22
            (c)  Performance of Agreements......................................    22
            (d)  No Material Adverse Change.....................................    22
            (e)  Officer's Certificates.........................................    23
 4.3        Conditions Precedent to Obligations of Occidental...................    23
            (a)  Closing Amendments Certificate.................................    23
            (b)  Accuracy of Representations and Warranties.....................    23

</TABLE> 

                                      -i-
<PAGE>
 
<TABLE> 
<CAPTION> 

 
                                                                                    PAGE
<S>         <C>                                                                      <C>     
            (c)  Performance of Agreements.......................................    23
            (d)  No Material Adverse Change......................................    23
            (e)  Board of Directors Approval.....................................    24
            (f)  Officer's Certificates..........................................    24
            (g)  Third Party Consents............................................    24
 
SECTION 5   TERMINATION AND WAIVER...............................................    24
 4.3        Conditions Precedent to Obligations of Occidental....................    23
 5.1        General..............................................................    24
 5.2        Effect of Termination................................................    25
 
SECTION 6   MISCELLANEOUS........................................................    25
 6.1        Successors and Assigns...............................................    25
 6.2        Benefits of Agreement Restricted to Parties..........................    25
 6.3        Notices..............................................................    25
 6.4        Severability.........................................................    26
 6.5        Press Releases.......................................................    26
 6.6        Confidentiality Agreement............................................    26
 6.7        Construction.........................................................    27
 6.8        Counterparts.........................................................    27
 6.9        Governing Law........................................................    27
 6.10       Transaction Costs....................................................    27
 6.11       Amendment............................................................    27
 6.12       Jurisdiction; Consent to Service of Process; Waiver..................    28
 6.13       Waiver of Jury Trial.................................................    28
 6.14       Action by the Partnership............................................    28
 
</TABLE>

                                      -ii-
<PAGE>
 
APPENDICES

Appendix A  Definitions
Appendix B  List of Related Agreements

SCHEDULES

Schedule 2.1     Exceptions to Representations and Warranties of the Partnership
Schedule 2.2     Exceptions to Representations and Warranties of Occidental
Schedule 2.3     Exceptions to Representations and Warranties of Lyondell
Schedule 2.4     Exceptions to Representations and Warranties of Millennium
Schedule 3.3     Selected Capital Expenditures
Schedule 4.3(g)  Occidental Consents
Schedule 6.10    Certain Expenses

                                     -iii-
<PAGE>
 
EXHIBITS

Exhibit A  Form of Amended and Restated Agreement of Limited Partnership
Exhibit B  Form of Occidental Asset Contribution Agreement
Exhibit C  Form of Amended and Restated Parent Agreement
Exhibit D  Form of Transition Services Agreement
Exhibit E  Form of Ethylene Purchase Agreement

                                      -iv-
<PAGE>
 
                         MASTER TRANSACTION AGREEMENT


     This Master Transaction Agreement (this "Agreement") dated March 19, 1998
is entered into by and between Equistar Chemicals, LP, a Delaware limited
partnership (the "Partnership"), Occidental Petroleum Corporation, a Delaware
corporation ("Occidental"), Lyondell Petrochemical Company, a Delaware
corporation ("Lyondell"), and Millennium Chemicals Inc., a Delaware corporation
("Millennium").

     The definitions of capitalized terms used in this Agreement, including the
appendices hereto, are set forth in Appendix A hereto.

     WHEREAS, Lyondell and Millennium entered into the Master Transaction
Agreement dated July 25, 1997, as amended, which contemplated, among other
things, the formation of the Partnership;

     WHEREAS, the Initial Partners entered into the Limited Partnership
Agreement of the Partnership dated October 10, 1997 and the Certificate of
Limited Partnership with respect to the Partnership became effective October 17,
1997;

     WHEREAS, the Partnership commenced operations December 1, 1997 upon its
acquisition of the Subject Businesses of Lyondell and Millennium Petrochemicals
Inc., a Virginia corporation and an indirect wholly owned subsidiary of
Millennium ("Millennium Petrochemicals");

     WHEREAS, Lyondell and Millennium, the respective ultimate parent entities
of the Initial Partners, desire to admit to the Partnership (i) PDG Chemical
Inc., a Delaware corporation and an indirect, wholly owned subsidiary of
Occidental ("PDG Chemical"), as a general partner, and (ii) a wholly owned
Subsidiary and a Delaware corporation (to be organized before Closing) ("OCC
Sub") of Occidental Chemical Corporation, a New York corporation ("OCC"), and
Oxy Petrochemicals Inc., a Delaware corporation and an indirect, wholly owned
subsidiary of Occidental ("Oxy Petrochemicals"), as limited partners, upon the
transfer to the Partnership of the Subject Business to be contributed by the
Occidental Partners, each a wholly owned Subsidiary of Occidental;

     WHEREAS, upon the terms and subject to the conditions set forth herein, the
Occidental Partners will contribute their Subject Business to the Partnership,
the Partnership will issue Units to the Occidental Partners and the Occidental
Partners will become partners in the Partnership, and certain other agreements
will be entered into as provided for herein; and

     WHEREAS, the parties who have executed this Agreement (the "Parties") wish
to make certain representations and warranties to one another and provide for
the coordination of the closing of all the transactions contemplated by this
Agreement (the "Closing");

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
of the Parties set forth herein, it is hereby agreed as follows:
<PAGE>
 
                                   SECTION 1
                        RELATED AGREEMENTS AND CLOSING

     1.1  Tier 1 Related Agreements.  The Tier 1 Related Agreements are
designated as such on Appendix B.  Forms of each of the Tier 1 Related
Agreements (including forms of certain of the exhibits and versions of certain
of the schedules thereto current as of the dates indicated therein) are attached
as Exhibits to this Agreement.  On the terms and subject to the conditions set
forth herein, the Parties shall cause each such agreement to be executed and
delivered by the appropriate parties thereto at the Closing in substantially the
form attached hereto with such changes as may be effected pursuant to Section
3.8 or otherwise agreed to by the Parties in good faith.

     1.2  Tier 2 Related Agreements.  The Tier 2 Related Agreements are
designated as such on Appendix B.  The forms of each of the Tier 2 Related
Agreements shall be negotiated by the Parties prior to the Closing in good
faith.  On the terms and subject to the conditions set forth herein, the Parties
shall cause such agreements to be executed and delivered in such forms by the
appropriate parties thereto at the Closing.

     1.3  Closing Date.  Provided that the conditions precedent set forth in
Section 4 of this Agreement shall have been satisfied or waived, the Closing
shall be held at a mutually agreeable location on the first day of the first
calendar month after the date hereof when all such conditions have been so
satisfied or waived or on such other date as may be agreed to in writing by the
Parties (the "Closing Date").  The Closing shall be deemed to occur at 4:01 a.m.
Houston, Texas time on the Closing Date.

     1.4  Partnership Long-term Debt.  At or immediately subsequent to the
Closing Date, the Partnership's long-term debt shall consist of:  (i) borrowings
under a bank credit agreement or agreements providing for maximum borrowings in
the amount of $1.5 billion (exclusive of any amounts to be used for working
capital purposes); (ii) Lyondell Assumed Debt (as defined in the Initial Master
Transaction Agreement) in the amount of $745 million and (iii) Occidental
Assumed Debt in the amount of $205 million; provided, however, that the amount
of the credit agreement or agreements described in (i) above may be adjusted to
such greater amount as may be reasonably satisfactory to the Partnership and
Occidental.

     1.5  Closing Transactions.  As contemplated by the Occidental Asset
Contribution Agreement, on the Closing Date the Occidental Partners shall make
or cause to be made the contributions of assets contemplated thereby, subject to
the assumption of liabilities contemplated thereby (including the Occidental
Assumed Debt).  As contemplated by the Amended and Restated Partnership
Agreement, on the Closing Date the Partnership shall (i) issue Units to the
Occidental Partners and the Occidental Partners will be admitted as partners of
the Partnership and (ii) issue Units to Lyondell LP, Lyondell GP, Millennium LP
and Millennium GP.  As contemplated by the Occidental Asset Contribution
Agreement, on the Closing Date a payment of $420 million in cash, in the
aggregate, shall be made by the Partnership to the Occidental Partners.  On the
Closing Date, OCC shall guarantee (with the form and terms thereof to be
substantially similar to the form of the guarantee by an Affiliate of Millennium
referenced in Section 8.6(c) of the Partnership Agreement and reasonably
satisfactory to Occidental and the Partnership) $420 million of indebtedness 

                                      -2-
<PAGE>
 
of the Partnership. On the Closing Date, the Partnership will distribute $75
million in cash to Millennium LP.

     1.6  Merger Agreements.  It is understood that after the date hereof, the
Parties will consider whether it is more efficient (and consistent with their
respective business objectives) to structure some or all of the asset transfers
contemplated by the Occidental Asset Contribution Agreement as statutory mergers
or as a transfer of the stock of Oxy Petrochemicals (immediately after the
manufacturing facilities owned thereby have been transferred to the
Partnership).  If all the Parties so determine, the Parties will seek to agree
upon (a) an appropriate form of merger agreement that, among other things,
contains provisions economically equivalent to the form of Occidental Asset
Contribution Agreement contemplated hereby or (b) changes to the Occidental
Asset Contribution Agreement to reflect such stock transfer, as applicable.

     1.7  Repayment of the Lyondell Note.  If the Lyondell Note is repaid
prior to Closing, distributions shall be made to the Initial Partners pro rata,
in an aggregate amount equal to the aggregate amount of such payment of
principal and interest.  If the Lyondell Note is not repaid prior to Closing,
the Parties agree to cause the Amended and Restated Partnership Agreement
entered into at Closing to provide for, or as of the Closing to otherwise cause
to be approved: (i) special distributions to the Initial Partners, equal in
amount, in the aggregate, to such payment of principal and interest, to be
allocated to the Initial Partners in accordance with their relative interests in
the Partnership prior to Closing and (ii) the allocation of interest income
accrued with respect to the Lyondell Note subsequent to Closing and prior to its
repayment, to the Initial Partners in accordance with their relative interests
in the Partnership prior to Closing.


                                   SECTION 2
                        REPRESENTATIONS AND WARRANTIES

     2.1  Representations and Warranties of the Partnership.  Except as set
forth on Schedule 2.1, the Partnership represents and warrants to each other
Party as follows:

          (a)  Organization, Good Standing and Power.  The Partnership (i) is a
     limited partnership duly organized, validly existing and in good standing
     under the laws of the state of Delaware and has the power and authority
     under its constituent documents to own, lease and operate its assets and to
     conduct its Subject Business now being conducted by it, (ii) is duly
     authorized, qualified or licensed to do business as a foreign limited
     partnership in, and is in good standing in, each of the jurisdictions in
     which its right, title or interest in or to any of the assets held by it
     requires such authorization, qualification or licensing, except where the
     failure to be so authorized, qualified, licensed or in good standing would
     not be reasonably likely to have a Material Adverse Effect with respect to
     its Subject Business, and (iii) has, and in the case of the Related
     Agreements to be executed by it at or prior to the Closing, will have, all
     requisite corporate power and authority, or power and authority under its
     constituent documents, to enter into this Agreement and, as applicable, the
     Related Agreements to which it is or will be a party and to perform its
     obligations hereunder and thereunder.

                                      -3-
<PAGE>
 
          (b) Authorization and Validity of Agreements.

               (i) The execution, delivery and performance by the Partnership of
          this Agreement and the consummation by it of the transactions
          contemplated hereby have been duly authorized and approved by all
          necessary corporate or similar action on its part.  This Agreement has
          been duly and validly executed and delivered by the Partnership and is
          its legal, valid and binding obligation, enforceable against it in
          accordance with its terms, except as the same may be limited by
          applicable bankruptcy, insolvency, reorganization, moratorium or other
          laws related to or affecting creditors' rights generally and by
          general equity principles.

               (ii) The execution, delivery and performance by the Partnership
          of the Related Agreements to which it will be a party and the
          consummation by it of the transactions contemplated thereby will be,
          as of the Closing, duly authorized and approved by all necessary
          action on its part.  At the Closing, each of the Related Agreements to
          which the Partnership will be a party will be duly and validly
          executed and delivered by the Partnership and will be upon execution
          and delivery a legal, valid and binding obligation, enforceable
          against it in accordance with its terms, except as the same may be
          limited by applicable bankruptcy, insolvency, reorganization,
          moratorium or other laws related to or affecting creditors' rights
          generally and by general equity principles.

          (c) Lack of Conflicts.   Except with respect to the HSR Act as set
     forth in Section 4.1(d), each of the execution, delivery and performance by
     the Partnership of this Agreement and the Related Agreements to which it is
     or will be a party and the consummation by it of the transactions
     contemplated hereby and thereby does not and, as of the Closing, will not
     (i) violate (with or without the giving of notice or the lapse of time or
     both) any Legal Requirement applicable to it or its Subsidiaries, other
     than those that would not be reasonably likely to have a Material Adverse
     Effect with respect to its Subject Business, (ii) conflict with, or result
     in the breach of, any provision of the charter or by-laws or similar
     governing or organizational documents of it or its Subsidiaries, (iii)
     result in the creation of any Encumbrance upon any of their assets, other
     than those contemplated by this Agreement or any of the Related Agreements,
     or those that would not be reasonably likely to have a Material Adverse
     Effect with respect to its Subject Business, or (iv) violate, conflict with
     or result in the breach or termination of or otherwise give any other
     Person the right to terminate, or constitute a default, event of default or
     an event which with notice, lapse of time or both, would constitute a
     default or event of default under the terms of, any contract, indenture,
     lease, mortgage, Government License or other agreement or instrument to
     which it or any of its Subsidiaries is a party or by which the properties
     or businesses of it or any of its Subsidiaries are bound, except for
     violations, conflicts, breaches, terminations and defaults that would not
     be reasonably likely to have a Material Adverse Effect with respect to its
     Subject Business.

                                      -4-
<PAGE>
 
          (d) Certain Fees.  Neither the Partnership nor any of its Affiliates
     nor any of its officers, directors or employees, on behalf of it or such
     Affiliates, has employed any broker or finder or incurred any other
     liability for any financial advisory fees, brokerage fees, commissions or
     finders' fees in connection with the transactions contemplated hereby.

          (e) Financial Statements.  The Partnership's audited financial
     statements as of and for the year ended December 31, 1997 and any unaudited
     quarterly financial statements prepared pursuant to Section 5.4 of the
     Partnership Agreement since December 31, 1997 (in each case including any
     notes thereto), were prepared in accordance with United States generally
     accepted accounting principles applied on a consistent basis ("GAAP")
     throughout the periods indicated (except as may be indicated in the notes
     thereto and except that unaudited or quarterly financial statements do not
     contain all GAAP notes to such financial statements) and each fairly
     presents the consolidated (or combined, as applicable) financial position,
     results of operations and changes in partners' equity and cash flows of the
     Partnership and its subsidiaries as at the respective dates thereof and for
     the respective periods indicated therein (subject, in the case of unaudited
     statements, to normal and recurring year-end adjustments).

          (f) Absence of Certain Changes.  Since December 31, 1997, (i) the
     Partnership and its Affiliates have not incurred any material liabilities
     or obligations, fixed, contingent, accrued or otherwise, (A) that relate to
     or are allocable to its Subject Business and that have had or are
     reasonably likely to have a Material Adverse Effect with respect to its
     Subject Business, or (B) that would cause the long-term debt of the
     Partnership immediately prior to the Closing to exceed the aggregate of
     $1.745 billion and any amounts borrowed under the Partnership's bank credit
     facility for working capital, (ii) the Partnership and its Affiliates have
     conducted its Subject Business in all material respects in the ordinary
     course, and (iii) no event, occurrence or other matter has occurred that is
     reasonably likely to have a Material Adverse Effect with respect to its
     Subject Business, provided that this determination shall be made without
     regard to any change in general economic or political conditions or any
     change in raw materials prices, product prices, industry capacity or other
     matter of industry-wide application that affects its Subject Business and
     Occidental's Subject Business in a substantially similar way.

          (g) Partnership Documents.  The Partnership has provided to Occidental
     a true and correct copy of the Partnership Agreement, as amended to date.
     The Partnership has provided to Occidental true and correct copies of (i)
     all minutes of meetings of the Partnership Governance Committee held to
     date and such minutes accurately reflect all actions, approvals and
     authorizations (including with respect to the Strategic Plan) by or of the
     Partnership Governance Committee, (ii) the Strategic Plan and (iii) the
     current annual budget of the Partnership.

          (h) Partnership Interests.  Without giving effect to this Agreement or
     the transactions contemplated hereby, Lyondell LP, Lyondell GP, Millennium
     LP and Millennium GP are the only Partners in the Partnership and the only
     holders of Units, in the denominations set forth in the Partnership
     Agreement.  Without giving effect to this 

                                      -5-
<PAGE>
 
     Agreement or the transactions contemplated hereby, there are no outstanding
     subscriptions, options, convertible securities, warrants or calls of any
     kind issued or granted by, or binding upon, the Partnership to purchase or
     otherwise acquire or to sell or otherwise dispose of any security of or
     equity interest in the Partnership.

          (i) Conduct of the Partnership Subject Business since December 1,
     1997.  Except as required or contemplated by approvals or authorizations
     (including the Strategic Plan) by or of the Partnership Governance
     Committee, since the contribution of their Subject Assets to the
     Partnership by Lyondell and Millennium on December 1, 1997, the Partnership
     has:

          (i)  maintained its books, accounts and records relating to its
               Subject Business in the usual, regular and ordinary manner,
               complied in all material respects with all Legal Requirements and
               contractual obligations applicable to its Subject Business or to
               the conduct of its Subject Business and performed all of its
               material obligations relating to its Subject Business;

          (ii) not (A) modified or changed in any material respect any of its
               assets or disposed of any material asset except for (1)
               inventory, equipment, supplies and other assets sold or otherwise
               disposed of in the ordinary course of business and (2) any assets
               that in the ordinary course of business were replaced with
               substantially similar assets, (B) except in the ordinary course
               of business, (x) entered into any contract, commitment or
               agreement material to the operation of its Subject Business or
               use of its assets or, except as expressly contemplated by or
               required pursuant to their respective terms, modified or changed
               in any material respect any obligation under any such contract,
               commitment or agreement, (y) modified or changed in any material
               respect any obligation under its Government Licenses, (z)
               modified or changed in any material respect the manner in which
               the products produced by its Subject Business are marketed and
               sold, or (C) entered into interest rate protection or other
               hedging agreements (except for hydrocarbon hedging agreements
               entered into in the ordinary course and expiring prior to
               December 31, 1998) relating to its Subject Business; provided,
               that, for purposes of (A) and (B), "material" shall mean a change
               or modification that was subject to the unanimous voting
               requirement of Section 6.7 of the Partnership Agreement; and

         (iii) not waived any material claims or rights relating to its
               Subject Business.

                                      -6-
<PAGE>
 
          (j)  Employee Benefits.

          (i)  Each of the Partnership's Defined Benefit and Defined
               Contribution Pension Plans covering employees ("Employee Plan")
               is in substantial compliance with applicable requirements
               prescribed by any and all Legal Requirements, including, but not
               limited to the Code, except for violations the occurrence of
               which would not in the aggregate reasonably be expected to have a
               Material Adverse Effect with respect to its Subject Business;

          (ii) The Partnership has in all material respects performed all
               obligations required to be performed by it under ERISA, the Code
               and any other applicable Legal Requirements and under the terms
               of each Employee Plan, except such failures to perform which
               would not in the aggregate reasonably be expected to have a
               Material Adverse Effect with respect to its Subject Business.
               The Partnership has received no written notice of the existence
               of any material default or violation by any other party of any of
               such Legal Requirements, terms or requirements applicable to any
               of the Employee Plans;

        (iii)  Other than routine claims for benefits, the Partnership has not
               received any written notice of any pending material claims or
               lawsuits which have been asserted or instituted against any of
               the Employee Plans, the assets of the trust or funds under the
               Employee Plans, the sponsor or administrator of any of the
               Employee Plans, or against any fiduciary of any of the Employee
               Plans with respect to the operation of such Plan;

          (iv) The Partnership has not received any written notice of any
               pending investigation or pending enforcement action by the
               Pension Benefit Guaranty Corporation, the Department of Labor,
               the Internal Revenue Service or any other Authority with respect
               to any of the Employee Plans;

          (v)  All contributions required to be made under the terms of the
               Partnership's Employee Plans have been timely made.  No Employee
               Plan has an "accumulated funding deficiency" (within the meaning
               of Section 412 of the Code or Section 302 of ERISA);

          (vi) All of the Partnership's "group health plans" (within the meaning
               of Code Section 5000(b)(1)) have been operated in substantial
               compliance with the group health plan continuation coverage
               requirements of Section 4980B of the Code and Sections 601
               through 608 of ERISA, Title XXII of the Public Health Service Act
               and the provisions of the Social Security Act;

        (vii)  There has been no act or omission by the Partnership that has
               given rise to or may give rise to material fines, penalties,
               taxes, or related charges under Section 502(c), (i) or (l) or
               Section 4071 of ERISA or Chapter 43 of the Code 

                                      -7-
<PAGE>
 
               or the imposition of a lien pursuant to Sections 401(a)(29) or
               412(n) of the Code or pursuant to ERISA;

       (viii)  Except with respect to the transactions contemplated by this
               Agreement, no "reportable event" within the meaning of Section
               4043 of ERISA, or prohibited transaction within the meaning of
               Section 406 of ERISA, has occurred with respect to any Employee
               Plan which would reasonably be expected to have a Material
               Adverse Effect; and

          (ix) No Employee Plan is a "multiemployer plan" as such term is
               defined in section 3(37) of ERISA.  No Employee Plan is a plan
               maintained by more than one employer (a so-called "multiple
               employer plan") for purposes of section 413(c) of the Code or
               otherwise.

          (k) Conduct of Business in Compliance with Regulatory and Contractual
     Requirements.  The Partnership and each Affiliate thereof is operating and
     conducting its Subject Business in compliance with all applicable Legal
     Requirements, rights of concession, licenses, know-how or other proprietary
     rights of others, the failure to comply with which would reasonably be
     expected to have a Material Adverse Effect with respect to its Subject
     Business.

          (l) Legal Proceedings.  There is no litigation, proceeding, claim,
     grievance, arbitration, investigation or other action to which the
     Partnership or any Affiliate thereof is a party (including proceedings or
     claims by or before the National Labor Relations Board, the Equal
     Employment Opportunity Commission, the Department of Labor or any other
     Authority) (i) that is pending or, to the Knowledge of the Partnership,
     threatened, (ii) that relates in any way to the operation or conduct of its
     Subject Business, or to the transactions contemplated by this Agreement,
     and (iii) that upon resolution adverse to Partnership or any Affiliate,
     could reasonably be expected to have a Material Adverse Effect with respect
     to its Subject Business.

          (m) Initial Asset Contributions.  To the Partnership's Knowledge,
     there is no basis for a claim by the Partnership against Lyondell or
     Millennium Petrochemicals for breach of representation or warranty of any
     of their respective representations and warranties set forth in the
     Lyondell Asset Contribution Agreement or the Millennium Asset Contribution
     Agreement.

     2.2  Representations and Warranties of Occidental  .   Except as set forth
on Schedule 2.2, Occidental represents and warrants to each other Party as
follows:

          (a)  Organization, Good Standing and Power.  Occidental and each
     member of its Group (i) is (or, if not yet formed, at the Closing will be)
     a corporation, duly organized, validly existing and in good standing under
     the laws of the jurisdiction of its incorporation and has (or, if not yet
     formed, at the Closing will have) the corporate power and authority to own,
     lease and operate its assets and, if applicable, to conduct the Subject
     Business now 

                                      -8-
<PAGE>
 
     being conducted by it and to be conducted by it as of the Closing, (ii) is
     (or, if not yet formed, at the Closing will be) duly authorized, qualified
     or licensed to do business as a foreign corporation in, and is (or, if not
     yet formed, at the Closing will be) in good standing in, each of the
     jurisdictions in which its right, title or interest in or to any of the
     assets held by it or the Subject Business conducted by it, if applicable
     (or, if not yet formed, the assets or business to be held or conducted by
     it as of the Closing), requires such authorization, qualification or
     licensing, except where the failure to be so authorized, qualified,
     licensed or in good standing would not be reasonably likely to have a
     Material Adverse Effect with respect to its Subject Business, and (iii)
     has, and in the case of the Related Agreements to be executed by it at or
     prior to the Closing, will have, all requisite corporate power and
     authority to enter into this Agreement and, as applicable, the Related
     Agreements to which it is or will be a party and to perform its obligations
     hereunder and thereunder.

          (b)   Authorization and Validity of Agreements.  Assuming the approval
     of Occidental's board of directors referred to in Section 4.3(e):

               (i) The execution, delivery and performance by Occidental of this
          Agreement and the consummation by it of the transactions contemplated
          hereby have been duly authorized and approved by all necessary
          corporate or similar action on its part.  This Agreement has been duly
          and validly executed and delivered by Occidental and is its legal,
          valid and binding obligation, enforceable against it in accordance
          with its terms, except as the same may be limited by applicable
          bankruptcy, insolvency, reorganization, moratorium or other laws
          related to or affecting creditors' rights generally and by general
          equity principles.

          (ii) The execution, delivery and performance by Occidental and each
          member of its Group of the Related Agreements to which it or any
          member of its Group will be a party and the consummation by it and its
          Group of the transactions contemplated thereby will be, as of the
          Closing, duly authorized and approved by all necessary corporate or
          similar action on its or their part.  At the Closing, each of the
          Related Agreements to which Occidental or any member of its Group will
          be a party will be duly and validly executed and delivered by
          Occidental or member and will be upon execution and delivery a legal,
          valid and binding obligation, enforceable against it or such member in
          accordance with its terms, except as the same may be limited by
          applicable bankruptcy, insolvency, reorganization, moratorium or other
          laws related to or affecting creditors' rights generally and by
          general equity principles.

          (c) Lack of Conflicts.  Assuming satisfaction of the condition in
     Section 4.1(c) and receipt of the Consents contemplated by Schedule 4.3(g),
     and except with respect to the HSR Act as set forth in Section 4.1(d), each
     of the execution, delivery and performance by Occidental and each member of
     its Group of this Agreement and the Related Agreements to which any of them
     is or will be a party and the consummation by them of the transactions
     contemplated hereby and thereby does not and, as of the Closing, will not
     (i) violate (with or without the giving of notice or the lapse of time or
     both) any Legal Requirement 

                                      -9-
<PAGE>
 
     applicable to any of them or any of their Subsidiaries, other than those
     that would not be reasonably likely to have a Material Adverse Effect with
     respect to its Subject Business, (ii) conflict with, or result in the
     breach of, any provision of the charter or by-laws or similar governing or
     organizational documents of any of them or any of their Subsidiaries, (iii)
     result in the creation of any Encumbrance upon any of their assets, other
     than those contemplated by this Agreement or any of the Related Agreements,
     or those that would not be reasonably likely to have a Material Adverse
     Effect with respect to its Subject Business, or (iv) violate, conflict with
     or result in the breach or termination of or otherwise give any other
     Person the right to terminate, or constitute a default, event of default or
     an event which with notice, lapse of time or both, would constitute a
     default or event of default under the terms of, any contract, indenture,
     lease, mortgage, Government License or other agreement or instrument to
     which any of them or any of their Subsidiaries is a party or by which the
     properties or businesses of any of them or any of their Subsidiaries are
     bound, except for violations, conflicts, breaches, terminations and
     defaults that would not be reasonably likely to have a Material Adverse
     Effect with respect to its Subject Business.

          (d) Certain Fees.  Neither Occidental nor any of its Affiliates nor
     any of its officers, directors or employees, on behalf of it or such
     Affiliates, has employed any broker or finder or incurred any other
     liability for any financial advisory fees, brokerage fees, commissions or
     finders' fees in connection with the transactions contemplated hereby.

          (e) SEC Reports; Financial Statements.

               (i) Occidental has filed all material forms, reports and
          documents required to be filed by it with the SEC since December 31,
          1996 (its "SEC Reports").  Occidental's SEC Reports were prepared in
          all material respects in accordance with the requirements of the
          Securities Act, or the Exchange Act, as the case may be, and the rules
          and regulations thereunder, and none of Occidental's SEC Reports, as
          of the date they were filed with the SEC, contained any untrue
          statement of a material fact or omitted to state a material fact
          required to be stated therein or necessary to make the statements
          therein, in the light of the circumstances under which they were made,
          not misleading.

               (ii) The financial statements (including any notes thereto)
          contained in Occidental's SEC Reports were prepared in accordance with
          GAAP throughout the periods indicated (except as may be indicated in
          the notes thereto and except that financial statements included with
          quarterly reports on Form 10-Q do not contain all GAAP notes to such
          financial statements) and each fairly presents the consolidated (or
          combined, as applicable) financial position, results of operations and
          changes in stockholders' equity and cash flows of Occidental and its
          subsidiaries as at the respective dates thereof and for the respective
          periods indicated therein (subject, in the case of unaudited
          statements, to normal and recurring year-end adjustments).

                                      -10-
<PAGE>
 
          (f) Absence of Certain Changes.  Since December 31, 1996, (i)
     Occidental and its Affiliates have not incurred any material liabilities or
     obligations, fixed, contingent, accrued or otherwise, that relate to or are
     allocable to its Subject Business and that have had or are reasonably
     likely to have a Material Adverse Effect with respect to its Subject
     Business, (ii) Occidental and its Affiliates have conducted its Subject
     Business in all material respects in the ordinary course, consistent with
     past practice, and (iii) no event, occurrence or other matter has occurred
     that is reasonably likely to have a Material Adverse Effect with respect to
     the Subject Business of Occidental, provided that this determination shall
     be made without regard to any change in general economic or political
     conditions or any change in raw materials prices, product prices, industry
     capacity or other matter of industry-wide application that affects the
     Partnership's Subject  Business and Occidental's Subject Business in a
     substantially similar way.

     2.3  Representations and Warranties of Lyondell.  Except as set forth on
Schedule 2.3, Lyondell represents and warrants to each other Party as follows:

          (a)  Organization, Good Standing and Power.  Lyondell and each member
     of its Group (i) is a corporation duly organized, validly existing and in
     good standing under the laws of the State of Delaware and has the corporate
     power and authority to own, lease and operate its assets, (ii) is duly
     authorized, qualified or licensed to do business as a foreign corporation
     or other organization in, and is in good standing in, each of the
     jurisdictions in which its right, title or interest in or to any of the
     assets held by it requires such authorization, qualification or licensing,
     except where the failure to be so authorized, qualified, licensed or in
     good standing would not be reasonably likely to have a Material Adverse
     Effect with respect to the Partnership's Subject Business, and (iii) has,
     and in the case of the Related Agreements to be executed by it at or prior
     to the Closing, will have, all requisite corporate power and authority, or
     power and authority under its constituent documents, to enter into this
     Agreement and, as applicable, the Related Agreements to which it is or will
     be a party and to perform its obligations hereunder and thereunder.

          (b)   Authorization and Validity of Agreements.

               (i) The execution, delivery and performance by Lyondell of this
          Agreement and the consummation by it of the transactions contemplated
          hereby have been duly authorized and approved by all necessary
          corporate or similar action on its part.  This Agreement has been duly
          and validly executed and delivered by Lyondell and is its legal, valid
          and binding obligation, enforceable against it in accordance with its
          terms, except as the same may be limited by applicable bankruptcy,
          insolvency, reorganization, moratorium or other laws related to or
          affecting creditors' rights generally and by general equity
          principles.

               (ii) The execution, delivery and performance by Lyondell and each
          member of its Group of the Related Agreements to which it or any
          member of its Group will be a party and the consummation by it and its
          Group of the transactions contemplated thereby will be, as of the
          Closing, duly authorized and approved by 

                                      -11-
<PAGE>
 
          all necessary corporate or similar action on its or their part. At the
          Closing, each of the Related Agreements to which Lyondell or any
          member of its Group will be a party will be duly and validly executed
          and delivered by Lyondell or member and will be upon execution and
          delivery a legal, valid and binding obligation, enforceable against it
          or such member in accordance with its terms, except as the same may be
          limited by applicable bankruptcy, insolvency, reorganization,
          moratorium or other laws related to or affecting creditors' rights
          generally and by general equity principles.

          (c) Lack of Conflicts.   Except with respect to the HSR Act as set
     forth in Section 4.1(d), each of the execution, delivery and performance by
     Lyondell and each member of its Group of this Agreement and the Related
     Agreements to which any of them is or will be a party and the consummation
     by them of the transactions contemplated hereby and thereby does not and,
     as of the Closing, will not (i) violate (with or without the giving of
     notice or the lapse of time or both) any Legal Requirement applicable to
     any of them or any of their Subsidiaries, other than those that would not
     be reasonably likely to have a Material Adverse Effect with respect to
     Lyondell, (ii) conflict with, or result in the breach of, any provision of
     the charter or by-laws or similar governing or organizational documents of
     any of them or any of their Subsidiaries, (iii) result in the creation of
     any Encumbrance upon any of their assets, other than those contemplated by
     this Agreement or any of the Related Agreements, or those that would not be
     reasonably likely to have a Material Adverse Effect with respect to
     Lyondell, or (iv) violate, conflict with or result in the breach or
     termination of or otherwise give any other Person the right to terminate,
     or constitute a default, event of default or an event which with notice,
     lapse of time or both, would constitute a default or event of default under
     the terms of, any contract, indenture, lease, mortgage, Government License
     or other agreement or instrument to which any of them or any of their
     Subsidiaries is a party or by which the properties or businesses of any of
     them or any of their Subsidiaries are bound, except for violations,
     conflicts, breaches, terminations and defaults that would not be reasonably
     likely to have a Material Adverse Effect with respect to Lyondell.

          (d) Certain Fees.  Neither Lyondell nor any of its Affiliates nor any
     of its officers, directors or employees, on behalf of it or such
     Affiliates, has employed any broker or finder or incurred any other
     liability for any financial advisory fees, brokerage fees, commissions or
     finders' fees in connection with the transactions contemplated hereby.

          (e) Joint Proxy Statement.  The Joint Proxy Statement was prepared in
     all material respects in accordance with the requirements of the Securities
     Act, or the Exchange Act, as the case may be, and the rules and regulations
     thereunder, and, as of the date of the Stockholders' Meetings and insofar
     as it relates to the Subject Business of Lyondell, did not contain any
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein,
     in the light of the circumstances under which they were made, not
     misleading.

                                      -12-
<PAGE>
 
          (f) Title to Lyondell Units.  Without giving effect to this Agreement
     or the transactions contemplated hereby, Lyondell LP and Lyondell GP each
     owns the number of Units set forth in Section 2.1 of the Partnership
     Agreement opposite its name.  Except as contemplated by this Agreement,
     there are no outstanding subscriptions, options, convertible securities,
     warrants or calls of any kind issued or granted by, or binding upon, the
     Partnership or any member of the Lyondell Group to purchase or otherwise
     acquire or to sell or otherwise dispose of any security of or equity
     interest in the Partnership.

     2.4  Representations and Warranties of Millennium.  Except as set forth
on Schedule 2.4, Millennium represents and warrants to each other Party as
follows:

          (a)  Organization, Good Standing and Power.  Millennium and each
     member of its Group (i) is a corporation or a limited liability company
     duly organized, validly existing and in good standing under the laws of the
     jurisdiction of its incorporation or organization and has the corporate
     power and authority or power under its constituent documents to own, lease
     and operate its assets, (ii) is duly authorized, qualified or licensed to
     do business as a foreign corporation or other organization in, and is in
     good standing in, each of the jurisdictions in which its right, title or
     interest in or to any of the assets held by it requires such authorization,
     qualification or licensing, except where the failure to be so authorized,
     qualified, licensed or in good standing would not be reasonably likely to
     have a Material Adverse Effect with respect to the Partnership's Subject
     Business, and (iii) has, and in the case of the Related Agreements to be
     executed by it at or prior to the Closing, will have, all requisite
     corporate power and authority, or power and authority under its constituent
     documents, to enter into this Agreement and, as applicable, the Related
     Agreements to which it is or will be a party and to perform its obligations
     hereunder and thereunder.

          (b)   Authorization and Validity of Agreements.

               (i)   The execution, delivery and performance by Millennium of
          this Agreement and the consummation by it of the transactions
          contemplated hereby have been duly authorized and approved by all
          necessary corporate or similar action on its part.  This Agreement has
          been duly and validly executed and delivered by Millennium and is its
          legal, valid and binding obligation, enforceable against it in
          accordance with its terms, except as the same may be limited by
          applicable bankruptcy, insolvency, reorganization, moratorium or other
          laws related to or affecting creditors' rights generally and by
          general equity principles.

               (ii)   The execution, delivery and performance by Millennium and
          each member of its Group of the Related Agreements to which it or any
          member of its Group will be a party and the consummation by it and its
          Group of the transactions contemplated thereby will be, as of the
          Closing, duly authorized and approved by all necessary corporate or
          similar action on its or their part.  At the Closing, each of the
          Related Agreements to which Millennium or any member of its Group will
          be a party will be duly and validly executed and delivered by
          Millennium or member and will be upon execution and delivery a legal,
          valid and binding obligation, 

                                      -13-
<PAGE>
 
          enforceable against it or such member in accordance with its terms,
          except as the same may be limited by applicable bankruptcy,
          insolvency, reorganization, moratorium or other laws related to or
          affecting creditors' rights generally and by general equity
          principles.

          (c) Lack of Conflicts.  Except with respect to the HSR Act as set
     forth in Section 4.1(d), each of the execution, delivery and performance by
     Millennium and each member of its Group of this Agreement and the Related
     Agreements to which any of them is or will be a party and the consummation
     by them of the transactions contemplated hereby and thereby does not and,
     as of the Closing, will not (i) violate (with or without the giving of
     notice or the lapse of time or both) any Legal Requirement applicable to
     any of them or any of their Subsidiaries, other than those that would not
     be reasonably likely to have a Material Adverse Effect with respect to
     Millennium, (ii) conflict with, or result in the breach of, any provision
     of the charter or by-laws of any of them or any of their Subsidiaries,
     (iii) result in the creation of any Encumbrance upon any of their assets,
     other than those contemplated by this Agreement or any of the Related
     Agreements, or those that would not be reasonably likely to have a Material
     Adverse Effect with respect to Millennium, or (iv) violate, conflict with
     or result in the breach or termination of or otherwise give any other
     Person the right to terminate, or constitute a default, event of default or
     an event which with notice, lapse of time or both, would constitute a
     default or event of default under the terms of, any contract, indenture,
     lease, mortgage, Government License or other agreement or instrument to
     which any of them or any of their Subsidiaries is a party or by which the
     properties or businesses of any of them or any of their Subsidiaries are
     bound, except for violations, conflicts, breaches, terminations and
     defaults that would not be reasonably likely to have a Material Adverse
     Effect with respect to Millennium.

          (d) Certain Fees. Neither Millennium nor any of its Affiliates nor any
     of its officers, directors or employees, on behalf of it or such
     Affiliates, has employed any broker or finder or incurred any other
     liability for any financial advisory fees, brokerage fees, commissions or
     finders' fees in connection with the transactions contemplated hereby.

          (e) Joint Proxy Statement.  The Joint Proxy Statement was prepared in
     all material respects in accordance with the requirements of the Securities
     Act, or the Exchange Act, as the case may be, and the rules and regulations
     thereunder, and, as of the date of the Stockholders' Meetings and insofar
     as it relates to the Subject Business of Millennium, did not contain any
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein,
     in the light of the circumstances under which they were made, not
     misleading.

          (f) Title to Millennium Units. Without giving effect to this Agreement
     or the transactions contemplated hereby, Millennium LP and Millennium GP
     each owns the number of Units set forth in Section 2.1 of the Partnership
     Agreement opposite its name.  Except as contemplated by this Agreement,
     there are no outstanding subscriptions, options, convertible securities,
     warrants or calls of any kind issued or granted by, or binding upon, 

                                      -14-
<PAGE>
 
     the Partnership or any member of the Millennium Group to purchase or
     otherwise acquire or to sell or otherwise dispose of any security of or
     equity interest in the Partnership.


                                   SECTION 3
                             ADDITIONAL AGREEMENTS

     3.1  Access to Information.  Each of Occidental and the Partnership
agrees that, during the period commencing on the date hereof and ending at the
Closing, (i) it will give or cause to be given to any other Party and its
representatives reasonable access during normal business hours to the offices,
plants, properties, books and records relating to its Subject Business as such
other Party may reasonably request, (ii) it will furnish or cause to be
furnished to any other Party, such financial and operating data and any other
information with respect to the business and properties of its Subject Business
as such other Party may reasonably request (provided such data and information
need only be furnished to the extent it was prepared in the ordinary course) and
(iii) any other Party and its representatives shall be entitled to reasonable
access during normal business hours to the representatives, officers, employees
and contractors of such Party who are involved in its Subject Business as such
other Party may reasonably request; provided, that Lyondell and Millennium also
agree to the foregoing provisions to the extent that any of the foregoing remain
in their possession and have not been transferred to the Partnership; provided,
further that, after consultation, to the extent permissible, with such other
Party, such Party may restrict access and provision of information to the extent
it reasonably believes necessary to (w) comply with existing confidentiality
agreements with third parties (provided that, upon such other Party's reasonable
request, it shall use its commercially reasonable efforts to secure waivers of
any such confidentiality agreements), (x) ensure compliance with antitrust laws,
(y) preserve the secrecy of confidential information to the extent not related
to its Subject Business and (z) preserve legal privilege; and provided, further
that any access or information obtained by any Party and its representatives in
accordance with this Section 3.1 and otherwise in connection with the
consummation of the transactions contemplated by this Agreement and the Related
Agreements shall be subject to the terms and conditions of the Confidentiality
Agreement.

     3.2  Conduct of the Occidental Subject Business Pending the Closing Date.
Occidental agrees that, except as required or contemplated by this Agreement or
otherwise consented to or approved in writing by the Partnership, during the
period commencing on the date hereof and ending on the Closing Date, it will and
will cause its Affiliates to:

          (a) use its commercially reasonable efforts to operate and maintain
     its Subject Business in all material respects only in the usual, regular
     and ordinary manner consistent with past practice (including undertaking
     scheduled or necessary "turnarounds" or other maintenance work and
     including offsite storage, treatment and disposal of chemical substances
     generated prior to the Closing) and, to the extent consistent with such
     operation and maintenance, use commercially reasonable efforts to preserve
     the present business organization of its Subject Business intact, keep
     available the services of, and good relations with, the present employees
     and preserve present relationships with all persons having business
     dealings with its Subject Business, except in each case for such matters
     that, 

                                      -15-
<PAGE>
 
     individually and in the aggregate, do not and are not reasonably likely to
     have a Material Adverse Effect on its Subject Business;

          (b) maintain its books, accounts and records relating to its Subject
     Business in the usual, regular and ordinary manner, on a basis consistent
     with past practice, comply in all material respects with all Legal
     Requirements and contractual obligations applicable to its Subject Business
     or to the conduct of its Subject Business and perform all of its material
     obligations relating to its Subject Business;

          (c) not (i) modify or change in any material respect any of its
     Contributed Assets or dispose of any material Contributed Asset except for
     (A) inventory, equipment, supplies and other Contributed Assets sold or
     otherwise disposed of in the ordinary course of business and (B) any
     Contributed Assets that in the ordinary course of business are replaced
     with substantially similar Contributed Assets, (ii) except in the ordinary
     course of business after consultation with the Partnership, (x) enter into
     any contract, commitment or agreement that would be material to the
     operation of its Subject Business or use of the Contributed Assets or,
     except as expressly contemplated by this Agreement or expressly
     contemplated by or required pursuant to their respective terms, modify or
     change in any material respect any obligation under any such contract,
     commitment or agreement, (y) modify or change in any material respect any
     obligation under its Government Licenses, (z) modify or change in any
     material respect the manner in which the products produced by its Subject
     Business are marketed and sold, or (iii) enter into interest rate
     protection or other hedging agreements (except for hydrocarbon hedging
     agreements entered into in the ordinary course and expiring prior to
     December 31, 1998) relating to its Subject Business;

          (d) not waive any material claims or rights relating to its Subject
     Business;

          (e) after obtaining Knowledge thereof, give notice to the Partnership
     of any claim or litigation (threatened or instituted) or any other event or
     occurrence which could reasonably be expected to have a Material Adverse
     Effect on its Contributed Assets or Subject Business, other than the types
     of events, occurrences or other matters referred to in the proviso set
     forth in Section 2.2(f)(iii);

          (f) not take any action that is reasonably likely to result in its
     representations and warranties in Section 2 hereof, or in the form of
     Occidental Asset Contribution Agreement, not being true in all material
     respects as of the Closing Date; and

          (g) not agree, whether in writing or otherwise, to take any action it
     has agreed pursuant to this Section 3.2 not to take;

provided, however, that notwithstanding anything to the contrary contained in
this Section 3.2, prior to the Closing Date the Occidental Group and the
Partnership will act independently of each other in making decisions as to the
research and development, raw materials, manufacturing, pricing, marketing and
distribution of their products.

                                      -16-
<PAGE>
 
     3.3  Conduct of the Partnership Subject Business Pending the Closing Date.
The Partnership agrees that, except as required or contemplated by approvals
or authorizations (including the Strategic Plan) by or of the Partnership
Governance Committee prior to the date hereof or by this Agreement (including,
without limitation, Schedule 3.3 hereto) or otherwise consented to or approved
in writing by Occidental, during the period commencing on the date hereof and
ending on the Closing Date, it will and will cause its Affiliates to:

          (a) use its commercially reasonable efforts to operate and maintain
     its Subject Business in all material respects only in a usual, regular and
     ordinary manner consistent with the Strategic Plan (including undertaking
     scheduled or necessary "turnarounds" or other maintenance work and
     including offsite storage, treatment and disposal of chemical substances
     generated prior to the Closing) and, to the extent consistent with such
     operation and maintenance, use commercially reasonable efforts to preserve
     the present business organization of its Subject Business intact, keep
     available the services of, and good relations with, the present employees
     and preserve present relationships with all persons having business
     dealings with its Subject Business, except in each case for such matters
     that, individually and in the aggregate, do not and are not reasonably
     likely to have a Material Adverse Effect on its Subject Business;

          (b) maintain its books, accounts and records relating to its Subject
     Business in the usual, regular and ordinary manner, comply in all material
     respects with all Legal Requirements and contractual obligations applicable
     to its Subject Business or to the conduct of its Subject Business and
     perform all of its material obligations relating to its Subject Business;

          (c) not (i) modify or change in any material respect any of its assets
     or dispose of any material asset except for (A) inventory, equipment,
     supplies and other assets sold or otherwise disposed of in the ordinary
     course of business and (B) any assets that in the ordinary course of
     business are replaced with substantially similar assets, (ii) except in the
     ordinary course of business after consultation with Occidental, (x) enter
     into any contract, commitment or agreement that would be material to the
     operation of its Subject Business or use of its assets or, except as
     expressly contemplated by this Agreement or expressly contemplated by or
     required pursuant to their respective terms, modify or change in any
     material respect any obligation under any such contract, commitment or
     agreement, (y) modify or change in any material respect any obligation
     under its Government Licenses, (z) modify or change in any material respect
     the manner in which the products produced by its Subject Business are
     marketed and sold, or (iii) enter into interest rate protection or other
     hedging agreements (except for hydrocarbon hedging agreements entered into
     in the ordinary course and expiring prior to December 31, 1998) relating to
     its Subject Business; provided, that, for purposes of (i) and (ii),
     "material" shall mean a change or modification that is subject to the
     unanimous voting requirement of Section 6.7 of the Partnership Agreement;

          (d) not waive any material claims or rights relating to its Subject
     Business;

                                      -17-
<PAGE>
 
          (e) after obtaining Knowledge thereof, give notice to Occidental of
     any claim or litigation (threatened or instituted) or any other event or
     occurrence which could reasonably be expected to have a Material Adverse
     Effect on its assets or Subject Business, other than the types of events,
     occurrences or other matters referred to in the proviso set forth in
     Section 2.1(f)(iii);

          (f) not take any action that is reasonably likely to result in its
     representations and warranties in Section 2 hereof not being true in all
     material respects as of the Closing Date;

          (g) not to make any distributions that are not in compliance with
     Section 3.1 of the Partnership Agreement and Sections 1.5 and  1.7 of this
     Agreement; and

          (h) not agree, whether in writing or otherwise, to take any action it
     has agreed pursuant to this Section 3.3 not to take;

provided, however, that notwithstanding anything to the contrary contained in
this Section 3.3, prior to the Closing Date the Occidental Group and the
Partnership will act independently of each other in making decisions as to the
research and development, raw materials, manufacturing, pricing, marketing and
distribution of their products.

     3.4  Further Actions.

          (a) Each Party shall, if applicable, following execution of this
     Agreement, promptly make its filings under the HSR Act with respect to the
     transactions contemplated hereby; will cooperate with all other Parties in
     attempting to secure a waiver of the applicable waiting periods under such
     Act, and, upon the request of either the Federal Trade Commission or the
     United States Department of Justice, will supply such agency with any
     additional requested information as expeditiously as possible; and will use
     its commercially reasonable efforts to take, or cause to be taken, all
     other action and do, or cause to be done, all other things necessary,
     proper or appropriate to resolve the objections, if any, as may be asserted
     by any Authority with respect to the transactions contemplated hereby under
     any antitrust laws or regulations; provided that no Party shall be required
     to take any action that could have any material adverse effect on its or
     its Affiliates' business, operations, prospects, assets, condition
     (financial or otherwise) or results of operations or that would, or would
     be reasonably likely to, materially frustrate the financial or other
     business benefits reasonably expected to be derived by any Party from the
     transactions contemplated by this Agreement.
          (b) Subject to the terms and conditions hereof, each Party agrees to
     act in good faith and to use its commercially reasonable efforts to take,
     or cause to be taken, all actions and to do, or cause to be done, all
     things necessary, proper or advisable to consummate and make effective the
     transactions contemplated by this Agreement and under the Related
     Agreements to be entered into by such Party or its Affiliates at Closing,
     and to confirm that such transactions have been accomplished, including
     without limitation, using all commercially reasonable efforts:  (i) to
     obtain and effect prior to the Closing Date all necessary Consents and
     Filings; and (ii) to, in the case of Occidental, obtain prior to the
     Closing Date all Government Licenses or consents to the transfer of any
     Government 

                                      -18-
<PAGE>
 
     Licenses that are transferable by it or its Affiliates necessary to
     consummate the transactions contemplated hereby and by the Related
     Agreements and to allow for the prudent and uninterrupted operation of the
     Subject Business by the Partnership after the Closing. Each Party shall
     furnish to the other Party and its Affiliates such necessary information
     and assistance as the other may reasonably request in connection with its
     preparation of any such Filings or other materials required in connection
     with the foregoing.

          (c) Occidental shall use its commercially reasonable efforts to
     procure all Consents that are necessary to transfer its Subject Business to
     the Partnership.  Notwithstanding any other provision of this Agreement to
     the contrary, the Parties hereto acknowledge and agree that at the Closing
     Occidental or any Occidental Partner, as applicable, will not assign to the
     Partnership any Contract or warranties which by their terms require Consent
     from any other contracting party thereto unless any such Consent has been
     obtained prior to the Closing Date.  Before the Closing, the other Parties
     and the Partnership will use their commercially reasonable efforts and
     cooperate with Occidental and the Occidental Partners (together, the
     "Contracting Party") in obtaining any necessary Consents to the assignment
     of the Contracts, including, without limitation, by furnishing to the
     Contracting Party or other parties to any Contract summary financial
     information and other information with respect to the Partnership
     reasonably requested by the Contracting Party or such other parties and
     taking any such other actions (which, subject to any provisions to the
     contrary included in any Related Agreement, shall not include the
     incurrence of any expense not otherwise required to be incurred) as the
     Contracting Party or such other parties may reasonably request for the
     purpose of obtaining any releases, waivers or terminations as the
     Contracting Party may reasonably request on behalf of itself or any
     Affiliate.  No representation is made by the Contracting Party with respect
     to whether any Consent to assign a Contract will be obtainable, and in no
     event shall the initial capital contributions be subject to reduction as a
     result of any Contract not being assigned to the Partnership at the Closing
     by virtue of the necessary Consent not being obtained.  Following the
     Closing, the Partnership, Occidental and the Occidental Partners shall
     cooperate with each other and use commercially reasonable efforts to obtain
     those Consents that were not obtained prior to the Closing and (i) if such
     Consents are obtained following the Closing, Occidental and the Occidental
     Partners shall execute and deliver any other and further instruments of
     assignment, assumption, transfer and conveyance and take such other and
     further action as the Partnership may request in order to assign to the
     Partnership any Contract or warranties to which such Consents relate and
     (ii) pending such transfer or issuance to the Partnership, shall provide,
     to the extent it may lawfully do so, the Partnership with the benefits of
     any such Contracts, in which case, as provided for in the Occidental Asset
     Contribution Agreement, the Partnership shall promptly assume and discharge
     (or reimburse Occidental or its Affiliate for) all obligations and
     liabilities associated with the benefits of such Contracts so made
     available to the Partnership.

          (d) Occidental shall keep each other Party fully informed from time to
     time as any other Party shall reasonably request as to the status of all
     Consents being sought by Occidental or a Occidental Partner pursuant to
     Section 3.4(c).

                                      -19-
<PAGE>
 
          (e) Each Party shall furnish to the other Party such information,
     cooperation and assistance as reasonably may be requested in connection
     with the foregoing.

          (f) Each Party shall negotiate and otherwise act in good faith to
     complete, execute and deliver the Related Agreements at the Closing and to
     effect the Closing at the earliest practicable date.

     3.5  Notifications.  Each Party shall notify the other Parties and keep
them advised as to (i) any litigation or administrative proceeding that is
either pending or, to its Knowledge, threatened against such Party which
challenges the transactions contemplated hereby; (ii) in the case of the
Partnership or Occidental, any material damage to or destruction of its Subject
Business and (iii) any fact of which such Party has Knowledge that indicates
that any condition to Closing is reasonably likely not to be satisfied in a
timely fashion.

     3.6  Employee Matters.

          (a) Substantially all employees of Occidental, OCC or one of the
     Occidental Partners who are associated primarily with Occidental's Subject
     Business shall be offered employment with the Partnership pursuant to the
     terms of the Occidental Asset Contribution Agreement.

          (b) The Partnership shall provide benefits to such employees who
     become employees of the Partnership under the benefit plans and programs of
     the Partnership upon employment with the Partnership, subject to the more
     specific provisions of the Occidental Asset Contribution Agreement.

          (c) No provision of this Agreement shall require OCC or any of the
     Occidental Partners to fail to comply with the terms of any current
     collective bargaining agreement.

     3.7  Partnership Unanimous Consent Items.  No action that requires the
consent of Representatives of both Lyondell and Millennium pursuant to Section
6.7 of the Partnership Agreement shall be taken prior to the Closing without the
consent of Occidental (other than actions regarding this Agreement and the
transactions contemplated hereby).

     3.8  Closing Amendments Certificate.  At or immediately prior to the
Closing, each of  the Partnership and the Occidental Group shall complete and
deliver to the other an executed statement, signed by a duly authorized officer
of the Partnership or Occidental (as the representative of the Occidental Group)
setting forth all amendments and additions to this Agreement or the Related
Agreements or to the schedules and exhibits hereto and thereto (if any) that the
Partnership or the Occidental Group, respectively, believes in good faith to be
necessary (i) to make the representations and warranties of all of its members
contained in this Agreement or the Related Agreements true and correct in all
respects (other than such matters as are, individually and in the aggregate,
immaterial to its Subject Business) or (ii) to make such schedules and exhibits
accurate and complete as of the Closing (each a "Closing Amendments
Certificate").  Each of the Partnership and Occidental Group shall examine any
such Closing Amendments Certificate presented to it by 

                                      -20-
<PAGE>
 
the other, and if it is acceptable to it (or if it is willing to waive the
condition that such Closing Amendments Certificate be acceptable to it), the
Partnership or Occidental (as the Occidental Group's representative) shall also
execute it, whereupon the amendments and additions set forth therein with
respect to this Agreement and the Schedules and Exhibits hereto shall become
effective for all purposes and the amendments and additions set forth therein
with respect to the Related Agreements and the schedules and exhibits thereto
shall be effected prior to the execution and delivery thereof so as to be
effective for all purposes from and after the Closing.

                                   SECTION 4
                             CONDITIONS TO CLOSING

     4.1  Conditions Precedent to Obligations of All Parties.  The respective
obligations of the Parties to consummate the transactions contemplated by this
Agreement shall be subject to the satisfaction on or prior to the Closing Date
of each of the following conditions:

          (a)  No Injunction, etc.    No preliminary or permanent injunction or
     other order  issued by any federal or state court of competent jurisdiction
     in the United States or by any United States federal or state governmental
     or regulatory body or any statute, rule, regulation or executive order
     promulgated or enacted by any United States federal or state governmental
     authority shall be in effect which materially restrains, enjoins or
     otherwise prohibits (i) the transactions contemplated hereby; (ii) the
     ownership by the Partnership (including enjoyment of any rights relating
     thereto) of its Subject Business or Occidental's Subject Business at and
     after the Closing; or (iii) the operation by the Partnership of its Subject
     Business or Occidental's Subject Business at and after the Closing; and no
     Proceeding seeking any such injunction or order shall be pending; provided,
     that before any determination is made to the effect that this condition has
     not been satisfied, each Party shall each use commercially reasonable
     efforts to have such order or injunction lifted, vacated or dismissed.

          (b)  Tier 2 Related Agreements.  The Parties shall have reached
     agreement with respect to definitive execution forms of the Tier 2 Related
     Agreements in accordance with Section 1.2.

          (c)  Government Licenses and Consents.  Occidental shall have
     obtained and effected all Government Licenses and Consents required from
     any Authority for the consummation of the transactions contemplated
     hereunder and under the Related Agreements to be entered into at the
     Closing and required to allow for the prudent and uninterrupted operation
     of its Subject Business by the Partnership after the Closing in a manner
     consistent with past practices, except for those Government Licenses and
     Consents, the absence of which is not, in the aggregate, reasonably likely
     to have a Material Adverse Effect with respect to Occidental's Subject
     Business.

          (d)  HSR Act.  The waiting period applicable to the Closing under
     the HSR Act shall have expired or been terminated, and no consent,
     approval, permit or authorization in connection therewith shall impose
     terms or conditions that would have, or would be reasonably likely to have,
     a material adverse effect on any Party (assuming the Closing has 

                                      -21-
<PAGE>
 
     taken place) or that would, or would be reasonably likely to, materially
     frustrate the financial or other business benefits reasonably expected to
     be derived by any Party from the transactions contemplated by this
     Agreement.

          (e)  Amended Bank Credit Facility.  The Partnership shall have
     entered into the bank credit agreement contemplated by Section 1.4 and the
     conditions precedent to the availability of funds thereunder shall have
     been satisfied (subject only to the Closing of the transactions
     contemplated by this Agreement).

     4.2  Conditions Precedent to Obligations of the Partnership.  The
obligations of the Partnership under this Agreement are subject to the
satisfaction (or waiver by the Partnership) on or prior to the Closing Date of
each of the following conditions:

          (a)  Closing Amendments Certificate.  The Closing Amendments
     Certificate (if any) of the Occidental Group shall have been acceptable to
     the Partnership (or the Partnership shall have determined to waive the
     condition that such Closing Amendments Certificate be acceptable), and the
     Partnership shall have executed such certificate.

          (b)  Accuracy of Representations and Warranties.  Notwithstanding
     any investigation, inspection or evaluation conducted or notice or
     Knowledge obtained by any member of the Equistar Group (including any
     Knowledge obtained as a result of receipt of the Occidental Group's Closing
     Amendments Certificate), all representations and warranties (as amended
     pursuant to the Occidental Group's Closing Amendments Certificate, if
     applicable) of members of the Occidental Group contained in this Agreement
     and the Related Agreements that contain qualifications and exceptions
     relating to materiality or Material Adverse Effect shall be true and
     correct on and as of the Closing Date, and all other representations and
     warranties of the members of such Group contained in such agreements shall
     be true and correct in all material respects as of the Closing Date, in
     each case with the same force and effect as though such representations and
     warranties had been made on and as of the Closing Date (and such
     representations and warranties shall be deemed to have been made on and as
     of the Closing Date).

          (c)  Performance of Agreements.  Occidental and its Affiliates shall
     in all material respects have performed and complied with all obligations
     and agreements contained in this Agreement, and executed all agreements and
     documents (including the Tier 1 Related Agreements and the Tier 2 Related
     Agreements) to be performed, complied with or executed by it or them on or
     prior to the Closing Date.

          (d)  No Material Adverse Change.  After the date of this Agreement,
     no event, occurrence or other matter shall have occurred that is reasonably
     likely to have a Material Adverse Effect with respect to Occidental's
     Subject Business, provided that this determination shall be made without
     regard to any change in general economic or political conditions or any
     change in raw materials prices, product prices, industry capacity or other
     matter of industry-wide application that affects the Partnership's Subject
     Business and Occidental's Subject Business in a substantially similar way.

                                      -22-
<PAGE>
 
          (e)  Officer's Certificates.  The Partnership shall have received a
     certificate, dated the Closing Date, signed by the President or a Vice
     President of Occidental to the effect that, to the Knowledge of Occidental,
     the conditions specified in the above paragraphs have been fulfilled.

     4.3  Conditions Precedent to Obligations of Occidental.  The obligations
of Occidental under this Agreement are subject to the satisfaction (or waiver by
Occidental) on or prior to the Closing Date of each of the following conditions:

          (a)  Closing Amendments Certificate.  The Closing Amendments
     Certificate (if any) of the Partnership shall have been acceptable to the
     Occidental Group (or the Occidental Group shall have determined to waive
     the condition that such Closing Amendments Certificate be acceptable), and
     Occidental shall have executed it as the Occidental Group's representative.

          (b)  Accuracy of Representations and Warranties.  Notwithstanding
     any investigation, inspection or evaluation conducted or notice or
     Knowledge obtained by any member of the Occidental Group (including any
     Knowledge obtained as a result of receipt of a Closing Amendments
     Certificate), all representations and warranties (as amended pursuant to
     the Partnership's Closing Amendments Certificate, if applicable) of members
     of the Equistar Group, the Lyondell Group and the Millennium Group
     contained in this Agreement and the Related Agreements that contain
     qualifications and exceptions relating to materiality or Material Adverse
     Effect shall be true and correct on and as of the Closing Date, and all
     other representations and warranties of such Persons contained in such
     agreements shall be true and correct in all material respects as of the
     Closing Date, in each case with the same force and effect as though such
     representations and warranties had been made on and as of the Closing Date
     (and such representations and warranties shall be deemed to have been made
     on and as of the Closing Date).

          (c)  Performance of Agreements.  Each of the Partnership, Lyondell
     and its Affiliates and Millennium and its Affiliates shall in all material
     respects have performed and complied with all obligations and agreements
     contained in this Agreement, and executed all agreements and documents
     (including the Tier 1 Related Agreements and the Tier 2 Related Agreements)
     to be performed, complied with or executed by it or them on or prior to the
     Closing Date.

          (d)  No Material Adverse Change.  After the date of this Agreement,
     no event, occurrence or other matter shall have occurred that is reasonably
     likely to have a Material Adverse Effect with respect to the Partnership's
     Subject Business, provided that this determination shall be made without
     regard to any change in general economic or political conditions or any
     change in raw materials prices, product prices, industry capacity or other
     matter of industry-wide application that affects the Partnership's Subject
     Business and Occidental's Subject Business in a substantially similar way.

                                      -23-
<PAGE>
 
          (e)  Board of Directors Approval.  This Agreement and the Tier 1
     Related Agreements, and the transactions contemplated by such agreements,
     shall have been duly authorized and approved by Occidental's board of
     directors.

          (f)  Officer's Certificates.  Occidental shall have received
     certificates, dated the Closing Date, signed by the President or a Vice
     President of each of the Partnership, Lyondell and Millennium to the effect
     that, to the Knowledge of such Party, the conditions specified in the above
     paragraphs have been fulfilled; provided, that, with respect to the
     conditions set forth in Sections 4.3(b) and 4.3(c), such certificates shall
     only concern the accuracy of representations and warranties and performance
     of agreements of the Partnership, the Lyondell Group and the Millennium
     Group, respectively.

          (g)  Third Party Consents.  All Consents of any third party listed
     on Schedule 4.3(g) shall have been obtained.

                                   SECTION 5
                            TERMINATION AND WAIVER

     5.1  General.  This Agreement may be terminated and the transactions
contemplated herein and in the Related Agreements may be abandoned at any time
prior to the Closing:

          (a) by the written consent of the Parties;

          (b) by the Partnership, by notice to Occidental, if there has been a
     material misrepresentation or a breach of an agreement by Occidental in
     this Agreement that (i) if such misrepresentation or breach existed on the
     Closing Date, would constitute a failure to satisfy the conditions to
     Closing set forth in Section 4.2(b) and (ii) has not been cured and cannot
     reasonably be cured within 30 days after all other conditions to Closing
     have been satisfied;

          (c) by Occidental, by notice to the Partnership, if there has been a
     material misrepresentation or a breach of an agreement by any of the
     Partnership, Lyondell or Millennium in this Agreement that (i) if such
     misrepresentation or breach existed on the Closing Date, would constitute a
     failure to satisfy the conditions to Closing set forth in Section 4.3(b)
     and (ii) has not been cured and cannot reasonably be cured within 30 days
     after all other conditions to Closing have been satisfied;

          (d) by any Party, by notice to each other Party, if (i) after the date
     hereof and prior to the Closing any final, non-appealable order or
     injunction shall be issued by any federal or state court of competent
     jurisdiction in the United States or by any United States Authority, or any
     Legal Requirement shall be promulgated or enacted by any United States
     Authority, that would have the effect of prohibiting or making unlawful the
     performance of this Agreement, the execution, delivery or performance of
     any Related Agreement or the consummation of the Closing or (ii) the
     condition set forth in Section 4.3(e) shall not have been satisfied on or
     prior to May 2, 1998; and

                                      -24-
<PAGE>
 
          (e) by any Party, by notice to each other Party, in the event that,
     for any reason, the Closing does not occur on or before December 31, 1998;
     provided, however, that if the Closing does not occur due to the act or
     omission of one of the Parties, that Party may not terminate this Agreement
     pursuant to the provisions of this Section 5.1(e).

     5.2  Effect of Termination.  In the event of any termination of this
Agreement as provided above, this Agreement shall forthwith become wholly void
and of no further force and effect and there shall be no liability on the part
of any Party, its Subsidiaries or their respective officers or directors;
provided, however, that upon any such termination the obligations of the Parties
with respect to this Section 5, expenses under Section 6.10 and confidentiality
under Section 6.6 shall remain in full force and effect; and provided, further,
that nothing herein will relieve any party from liability for damages for any
breach of this Agreement.

                                   SECTION 6
                                 MISCELLANEOUS

     6.1  Successors and Assigns.  Except as may be expressly provided herein,
this Agreement shall be binding upon and inure to the benefit of the successors
of all of the Parties.  No Party may otherwise assign or delegate any of its
rights or obligations under this Agreement without the prior written consent of
all of the other Parties, which consent shall be in the sole and absolute
discretion of each such Party.  Any purported assignment or delegation without
such consent shall be void and ineffective.

     6.2  Benefits of Agreement Restricted to Parties.  This Agreement is made
solely for the benefit of the Parties, and no other Person (including employees)
shall have any right, claim or cause of action under or by virtue of this
Agreement.

     6.3  Notices.  All notices, requests and other communications that are
required or may be given under this Agreement shall, unless otherwise provided
for elsewhere in this Agreement, be in writing and shall be deemed to have been
duly given if and when (i) transmitted by telecopier facsimile with proof of
confirmation from the transmitting machine or (ii) delivered by commercial
courier or other hand delivery, as follows:

Equistar Chemicals, LP:             Occidental Petroleum Corporation:
Gerald A. O'Brien                   10889 Wilshire Boulevard
Vice President and Secretary        Los Angeles, California 90024
Equistar Chemicals, LP              Attention:  President
1221 McKinney Street                Telecopy Number: (310) 443-6977
Houston, Texas 77010
Telecopy Number: (713) 309-4718
 

                                      -25-
<PAGE>
 
with a copy to:                     with a copy to:
 
Baker & Botts, L.L.P.               Occidental Petroleum Corporation
910 Louisiana Street                10889 Wilshire Boulevard
Houston, Texas 77002                Los Angeles, California 90024
Attention: Stephen A. Massad        Attention:  General Counsel
Telecopy Number: (713) 229-1522     Telecopy Number: (310) 443-6333
 
Lyondell Petrochemical Company:     Millennium Chemicals Inc.:
Kerry A. Galvin                     George H. Hempstead, III
Chief Corporate Counsel and         Senior Vice President,
  Corporate Secretary               Law and Administration and Secretary
Lyondell Petrochemical Company      Millennium Chemicals Inc.
1221 McKinney Street                99 Wood Avenue South
Houston, Texas 77010                Iselin, New Jersey 08830
Telecopy Number:  (713) 309-4718    Telecopy Number: 908-603-6857

     6.4  Severability.  In the event that any provision of this Agreement
shall finally be determined to be unlawful, such provision shall, so long as the
economic and legal substance of the transactions contemplated hereby is not
affected in any materially adverse manner as to any of the Parties, be deemed
severed from this Agreement and every other provision of this Agreement shall
remain in full force and effect.

     6.5  Press Releases.  Unless otherwise mutually agreed, no Party shall
make or authorize any public release of information regarding the matters
contemplated by, or any provisions or terms of, this Agreement or the Related
Agreements, and Occidental shall not make or authorize any public release of
information regarding the Partnership, except (i) that a press release or press
releases in mutually agreed upon form or forms shall be issued by the Parties as
promptly as is practicable following the execution of this Agreement, (ii) that
the Parties may, after consultation with each other, communicate with employees,
customers, suppliers, stockholders, lenders, lessors, and other particular
groups as may be necessary or appropriate and not inconsistent with the prompt
consummation of the transactions contemplated by this Agreement and (iii) after
consultation with each other, as required by law or stock exchange rule or as
necessary for the assertion or enforcement of contractual rights.

     6.6  Confidentiality Agreement.  Lyondell, on behalf of the Partnership,
and Occidental have heretofore entered into the Confidentiality Agreement
relating to the exchange between Lyondell and the Partnership, on the one hand,
and Occidental and the Occidental Partners, on the other hand, of certain
confidential information related or otherwise pertinent to the transactions
contemplated by this Agreement.  Nothing in this Agreement shall be construed as
impairing or otherwise limiting the obligations assumed pursuant to the
Confidentiality Agreement by the parties thereto.  The Confidentiality Agreement
shall remain in full force and effect in accordance with its terms until the
earlier of Closing or its expiration date.  The Partnership and Millennium shall
be bound by, and shall be entitled to the benefits of, such Confidentiality
Agreement to the same extent as if they were parties thereto.

                                      -26-
<PAGE>
 
     6.7  Construction.  In construing this Agreement, the following
principles shall be followed: (i) no consideration shall be given to the
captions of the articles, sections, subsections or clauses, which are inserted
for convenience in locating the provisions of this Agreement and not as an aid
in construction; (ii) no consideration shall be given to the fact or presumption
that any of the Parties had a greater or lesser hand in drafting this Agreement;
(iii) examples shall not be construed to limit, expressly or by implication, the
matter they illustrate; (iv) the word "includes" and its syntactic variants mean
"includes, but is not limited to" and corresponding syntactic variant
expressions; (v) the plural shall be deemed to include the singular, and vice
versa; (vi) each gender shall be deemed to include the other genders; and (vii)
each exhibit, appendix, attachment and schedule to this Agreement is a part of
this Agreement.

     6.8  Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall constitute an original, and all of which when
taken together shall constitute one and the same original document.

     6.9  Governing Law.  The laws of the State of Delaware shall govern the
construction, interpretation and effect of this Agreement without giving effect
to any conflicts of law principles.

     6.10  Transaction Costs.

          (a0  Subject to subsection (b) and Section 2.8 of the Occidental Asset
     Contribution Agreement, and except as provided on Schedule 6.10, all
     reasonable out-of-pocket costs, fees and expenses incurred at any time by
     any Party in connection with the negotiation, execution and delivery of
     this Agreement, the satisfaction of the conditions to Closing under this
     Agreement and the consummation of the transactions contemplated hereby
     shall be reimbursed by the Partnership (if the cost, fee or expense was
     incurred by a Party other than the Partnership) and if incurred or
     reimbursed by the Partnership shall be shared by Lyondell, Millennium and
     Occidental pro rata in accordance with the relative interests to be held by
     their Subsidiaries in the Partnership after Closing; provided, however,
     that if any one expense item or series of directly related expenses exceeds
     $5 million, all of such expense or expenses in excess of such $5 million
     shall be paid by the Party incurring such expense.

          (b0  Notwithstanding the foregoing, each Party shall be solely
     responsible for and bear all of its own respective costs, fees and expenses
     if this Agreement is terminated and the Closing does not occur.

     6.11  Amendment  .  All waivers, modifications, amendments or alterations
of this Agreement shall require the written approval of each of the Parties.
Except as provided in the preceding sentence, no action taken pursuant to this
Agreement, including any investigation by or on behalf of any Party, shall be
deemed to constitute a waiver by the Party taking such action of compliance with
any representations, warranties, covenants or agreements contained herein and in
any documents delivered or to be delivered pursuant to this Agreement and in
connection with the 

                                      -27-
<PAGE>
 
Closing hereunder. The waiver by any Party hereto of a breach of any provision
of this Agreement shall not operate or be construed as a waiver of any
subsequent breach.

     6.12  Jurisdiction; Consent to Service of Process; Waiver.  ANY JUDICIAL
PROCEEDING BROUGHT AGAINST ANY PARTY TO THIS AGREEMENT OR ANY DISPUTE UNDER OR
ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT OR ANY MATTER RELATED HERETO
SHALL BE BROUGHT IN THE FEDERAL OR STATE COURTS OF THE STATE OF DELAWARE, AND,
BY EXECUTION AND DELIVERY OF THIS AGREEMENT, EACH OF THE PARTIES TO THIS
AGREEMENT ACCEPTS THE EXCLUSIVE JURISDICTION OF SUCH COURTS AND IRREVOCABLY
AGREES TO BE BOUND BY ANY JUDGMENT (AS FINALLY ADJUDICATED) RENDERED THEREBY IN
CONNECTION WITH THIS AGREEMENT.  EACH OF THE PARTIES TO THIS AGREEMENT SHALL
APPOINT THE CORPORATION TRUST COMPANY, THE PRENTICE-HALL CORPORATION SYSTEM,
INC. OR A SIMILAR ENTITY (THE "AGENT") AS AGENT TO RECEIVE ON ITS BEHALF SERVICE
OF PROCESS IN ANY PROCEEDING IN ANY SUCH COURT IN THE STATE OF DELAWARE, AND
EACH OF THE PARTIES TO THIS AGREEMENT SHALL MAINTAIN THE APPOINTMENT OF SUCH
AGENT (OR A SUBSTITUTE AGENT) FROM THE DATE HEREOF UNTIL THE EARLIER OF THE
CLOSING DATE OR THE TERMINATION OF THIS AGREEMENT AND SATISFACTION OF ALL
OBLIGATIONS HEREUNDER.  THE FOREGOING CONSENTS TO JURISDICTION AND APPOINTMENTS
OF AGENT TO RECEIVE SERVICE OF PROCESS SHALL NOT CONSTITUTE GENERAL CONSENTS TO
SERVICE OF PROCESS IN THE STATE OF DELAWARE FOR ANY PURPOSE EXCEPT AS PROVIDED
ABOVE AND SHALL NOT BE DEEMED TO CONFER RIGHTS ON ANY PERSON OTHER THAN THE
PARTIES HERETO.  EACH PARTY HEREBY WAIVES ANY OBJECTION IT MAY HAVE BASED ON
LACK OF PERSONAL JURISDICTION, IMPROPER VENUE OR FORUM NON-CONVENIENS.

     6.13  Waiver of Jury Trial.  EACH PARTY HEREBY KNOWINGLY AND
INTENTIONALLY, IRREVOCABLY AND UNCONDITIONALLY WAIVES TRIAL BY JURY IN ANY LEGAL
ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND FOR ANY COUNTERCLAIM
THEREIN.

     6.14  Action by the Partnership.  Any determination (including as to the
satisfaction of any and all conditions precedent to the obligations of the
Partnership set forth in Section 4.2 of this Agreement), consent, approval,
waiver, other action or right to be made, given, taken or exercised by the
Partnership pursuant to or as contemplated by this Agreement shall be subject to
the Partnership Governance Committee unanimous voting requirements set forth in
Section 6.7 of the Partnership Agreement; provided, however, that the
Partnership's exercise of its right of termination set forth in Section 5.1(b)
of this Agreement shall only require the approval of either two or more
Representatives of Lyondell or two or more Representatives of Millennium, acting
separately.

                           [SIGNATURE PAGES FOLLOW]

                                      -28-
<PAGE>
 
     IN WITNESS WHEREOF, this Master Transaction Agreement has been executed on
behalf of each of the Parties, by their respective officers thereunto duly
authorized, effective as of the date first written above.

                              EQUISTAR CHEMICALS, LP


                              By:   /s/  Dan F. Smith
                                 -------------------------------------
                                 Name:   Dan F. Smith
                                 Title:  Chief Executive Officer


                              OCCIDENTAL PETROLEUM CORPORATION


                              By:   /s/  Stephen I. Chazen
                                 --------------------------------------
                                  Name:  Stephen I. Chazen
                                  Title:  Executive Vice President


                              LYONDELL PETROCHEMICAL COMPANY


                              By:   /s/  Jeffrey R. Pendergraft
                                 ----------------------------------------
                                  Name:  Jeffrey R. Pendergraft
                                  Title:  Senior Vice President and
                                          Chief Administrative Officer


                              MILLENNIUM CHEMICALS INC.


                              By:      /s/ William M. Landuyt
                                 ---------------------------------------- 
                                  Name:   William M. Landuyt
                                  Title:  Chairman and Chief Executive Officer

                                      -29-
<PAGE>
 
                                  APPENDIX A
                                      TO
                         MASTER TRANSACTION AGREEMENT


                                  DEFINITIONS

"Affiliate" shall mean any Person that, directly or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with the Person specified; provided, however, that for purposes of this
Agreement (i) Canadian Occidental Petroleum Ltd. and any entities controlled by
it shall not be considered an Affiliate of the Occidental Group, (ii) Suburban
Propane Partners, L.P. and any entities controlled by it shall not be considered
an Affiliate of the Millennium Group, (iii) neither the Partnership nor any
entity controlled by it shall be considered an Affiliate of the Occidental
Group, the Lyondell Group or the Millennium Group, (iv) no member of the
Occidental Group, the Lyondell Group or the Millennium Group shall be considered
an Affiliate of the Partnership and (v) the Partnership shall not be considered
an Affiliate of any member of the Occidental Group, the Lyondell Group or the
Millennium Group.  For purposes of this definition, the term "control" shall
have the meaning set forth in 17 CFR 230.405, as in effect on the date hereof.

"Agreement" shall mean this Master Transaction Agreement entered into between
the Parties as of the date hereof.

"Amended and Restated Partnership Agreement" shall mean that certain Amended and
Restated Partnership Agreement of the Partnership to be executed and delivered
at the Closing in substantially the form attached hereto as Exhibit A.

"Assumed Liabilities" shall have the meaning assigned to such term in the
Occidental Asset Contribution Agreement.

"Authority" shall mean any government or governmental or regulatory body
thereof, or political subdivision thereof, whether federal, state, local or
foreign, or any agency, department or instrumentality thereof, or any court or
arbitrator (public or private).

"Business Day" shall mean any day other than a Saturday, Sunday or other day on
which banks are closed in New York City, New York.

"Code" shall mean the Internal Revenue Code of 1986, as amended.

"Closing" shall have the meaning set forth in the sixth WHEREAS clause of this
Agreement.

"Closing Amendments Certificate" shall have the meaning set forth in Section
3.8.

"Closing Date" shall have the meaning set forth in Section 1.4.

                                      A-1

<PAGE>
 
"Confidentiality Agreement" shall mean that certain Confidentiality Agreement
dated December 11, 1997 between Lyondell and Occidental.

"Consent" shall mean any consent, waiver, approval, authorization, exemption,
registration, license or declaration of or by any other Person or any Authority,
or any expiration or termination of any applicable waiting period under any
Legal Requirement, required with respect to any Party or any party to the
Related Agreements in connection with (i) the execution and delivery of this
Agreement or any of the Related Agreements or (ii) the consummation of any of
the transactions provided for hereby or thereby.

"Contracts" shall have the meaning assigned to such term in the Asset
Contribution Agreement.

"Contributed Assets" shall have the meaning assigned to the term "Assets" in the
Occidental Asset Contribution Agreement.

"Encumbrance" shall mean any lien, charge, encumbrance, security interest, title
defect, option or any other restriction or third-party right.

"ERISA" shall mean the Employee Retirement Income Security Act, as amended.

"Exchange Act" shall mean the Securities Exchange Act of 1934, as amended.

"Equistar Group" shall mean the Partnership, the Initial Partners, Lyondell,
Millennium and Millennium Petrochemicals.

"Filing" shall mean any filing with any Person or any Authority required with
respect to any Party in connection with (i) the execution and delivery of this
Agreement or any of the Related Agreements or (ii) the consummation of any of
the transactions provided for hereby or thereby.

"GAAP" shall have the meaning set forth in Section 2.1(e).

"Government License" shall have the meaning assigned to such term in the
Occidental Asset Contribution Agreement.

"Group" shall mean the Equistar Group, the Occidental Group, the Lyondell Group
or the Millennium Group, as appropriate.

"HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended.

"Initial Master Transaction Agreement" shall mean the Master Transaction
Agreement dated July 25, 1997, between Lyondell and Millennium, as amended.

"Initial Partners" shall mean Lyondell LP, Lyondell GP, Millennium LP and
Millennium GP.

                                      A-2

<PAGE>
 
"Joint Proxy Statement" shall mean the Joint Proxy Statement of Lyondell and
Millennium dated October 17, 1997.

"Knowledge" shall mean with respect to any Party the actual knowledge of (i) any
current plant manager, (ii) any current officer of such Party having
responsibilities with respect to an applicable Subject Business or the
transactions contemplated in this Agreement, (iii) in the case of Occidental,
any current officer of a Occidental Partner having responsibilities with respect
to Occidental's Subject Business or the transactions contemplated in this
Agreement, and (iv) any current employee reporting directly to an officer
described in clause (ii) or (iii).

"Legal Requirement" shall mean any law, statute, rule, ordinance, decree,
regulation, requirement, order or judgment of any Authority including the terms
of any Government License.

"Lyondell" shall have the meaning set forth in the first paragraph of this
Agreement.

"Lyondell Asset Contribution Agreement" shall mean that certain Asset
Contribution Agreement dated December 1, 1997, to which Lyondell and the
Partnership are parties.

"Lyondell GP" shall mean Lyondell Petrochemical G.P. Inc., a Delaware
corporation and a wholly owned Subsidiary of Lyondell.

"Lyondell Group" shall mean Lyondell, Lyondell LP and Lyondell GP.

"Lyondell LP" shall mean Lyondell Petrochemical L.P. Inc., a Delaware
corporation and a wholly owned Subsidiary of Lyondell.

"Lyondell Note" shall mean that certain promissory note in the aggregate
principal amount of $345 million dated December 1, 1997 payable to Equistar by
Lyondell LP.

"Material Adverse Effect" shall mean any adverse circumstance or consequence
that, individually or in the aggregate, has an effect that is material to the
financial condition, results of operations, assets or business of the applicable
Party or Subject Business (taken as a whole), as the case may be.

"Millennium" shall have the meaning set forth in the first paragraph of this
Agreement.

"Millennium Asset Contribution Agreement" shall mean that certain Asset
Contribution Agreement dated December 1, 1997, to which Millennium
Petrochemicals and the Partnership are parties.

"Millennium GP" shall mean Millennium GP LLC, a Delaware limited liability
company and an indirect, wholly owned Subsidiary of Millennium.

"Millennium Group" shall mean Millennium, Millennium Petrochemicals, Millennium
LP and Millennium GP.

                                      A-3

<PAGE>
 
"Millennium LP" shall mean Millennium LP LLC, a Delaware limited liability
company and an indirect, wholly owned Subsidiary of Millennium.

"Millennium Petrochemicals" shall have the meaning set forth in the third
WHEREAS clause of this Agreement.

"Occidental" shall have the meaning set forth in the first paragraph of this
Agreement.

"Occidental Asset Contribution Agreement" shall mean that certain Asset
Contribution Agreement between the Occidental Partners and the Partnership to be
executed and delivered at the Closing in substantially the form attached hereto
as Exhibit B.

"Occidental Assumed Debt" shall mean the Lease intended for Security, dated
December 18, 1991, among OCC, the institutions listed on Schedule I thereto,
Norwest Bank Minnesota, National Association, as Agent and Chemical Bank and the
Bank of Nova Scotia, as Information Agents, and having an amount outstanding as
of the date of this Agreement of $205 million.

"Occidental Group" shall mean Occidental, OCC and Oxy CH Corporation, a
California corporation, and the Occidental Partners.

"Occidental Partners" shall mean PDG Chemical, OCC Sub and Oxy Petrochemicals.

"OCC" shave have the meaning set forth in the fourth WHEREAS clause of this
Agreement.

"OCC Sub" shall mean a wholly owned Subsidiary of OCC, to be organized prior to
Closing.

"Oxy Petrochemicals" shall have the meaning set forth in the third WHEREAS
clause of this Agreement.

"Parties" shall have the meaning set forth in the sixth WHEREAS clause of this
Agreement.

"Partnership" shall have the meaning set forth in the first paragraph of this
Agreement.

"Partnership Agreement" shall mean the Agreement of Limited Partnership of the
Partnership dated October 10, 1997.

"Partnership Governance Committee" shall mean the "Partnership Governance
Committee" as defined in the Partnership Agreement.

"PDG Chemical" shall have the meaning set forth in the fourth WHEREAS clause of
this Agreement.

"Person" shall mean any natural person, corporation, partnership, limited
liability company, joint venture, association, trust or other entity or
organization.

                                      A-4

<PAGE>
 
"Proceeding" shall mean any action, suit, claim or legal, administrative or
arbitration proceeding or governmental investigation to which any Party or an
Affiliate is a party.

"Related Agreements" shall mean the Tier 1 Related Agreements and the Tier 2
Related Agreements.

"Representatives" shall mean the "Representatives," as defined in the
Partnership Agreement.

"SEC" shall mean the Securities and Exchange Commission.

"SEC Reports" shall have the meaning set forth in Section 2.2.(e).

"Securities Act" shall mean the Securities Act of 1933, as amended.

"Stockholders' Meetings" shall mean the special stockholders meetings of each of
Lyondell and Millennium held November 20, 1997.

"Strategic Plan" shall mean the Five-Year Strategic Plan adopted by the
Partnership Governance Committee, as amended and modified prior to the date
hereof pursuant to action of the Partnership Governance Committee, as set forth
in minutes of their meetings.

"Subject Business" shall mean (i) in the case of Occidental, the "Contributed
Business" as defined in the Occidental Asset Contribution Agreement, including
the Contributed Assets and the Assumed Liabilities related thereto; (ii) in the
case of each of Lyondell and Millennium, their respective "Contributed
Businesses" as defined in their respective Asset Contribution Agreements dated
December 1, 1997; and (iii) in the case of the Partnership, the business of the
Partnership, which consists substantially of the Subject Business of Lyondell
and Millennium.

"Subsidiary" shall mean, with respect to any Party, any Person of which such
Party, either directly or indirectly, owns 50% or more of the equity or voting
interests, except, in the case of Lyondell, Lyondell-CITGO Refining Company Ltd.
and Equistar Chemicals, LP.

"Tier 1 Related Agreements" shall mean those agreements so designated on
Appendix B, forms of each of which (including forms of the exhibits and certain
of the schedules thereto current as of the dates indicated therein), are
attached hereto as Exhibits.

"Tier 2 Related Agreements" shall mean those agreements so designated on
Appendix B (including Appendix B-2), descriptions of certain terms of which are
included thereon.

"Transition Services Agreement" shall mean that certain agreement to be executed
and delivered at the Closing in substantially the form attached hereto as
Exhibit D.

"Unit" shall mean a unit representing a partnership interest in the Partnership.

                                      A-5

<PAGE>
 
                                  APPENDIX B
                                      TO
                         MASTER TRANSACTION AGREEMENT


                          LIST OF RELATED AGREEMENTS


Tier 1 Related Agreements

     1.   Amended and Restated Agreement of Limited Partnership

     2.   Asset Contribution Agreement from Occidental Partners to the
          Partnership

     3.   Amended and Restated Parent Agreement

     4.   Transition Services Agreement

     5.   Sales Agreement (Ethylene)


Tier 2 Related Agreements

     1.   Agreements listed as exhibits in the table of contents of the
          Occidental Asset Contribution Agreement.

     2.   EO/EG Ashtabula Tolling Agreement.

     3.   [EO/EG Export Sales Service Agreement]

     4.   Amended and Restated Indemnity Agreement among OCC, PDG Chemical, Oxy
          Petrochemicals, OCC Sub, Lyondell GP, Lyondell LP, Millennium GP,
          Millennium LP and Millennium America Inc. amending and restating the
          Indemnity Agreement, dated December 1, 1997, in order to provide for
          (i) comparable treatment for OCC with respect to the $420 million of
          OCC guaranteed debt as was provided for with respect to the Millennium
          America Guaranteed Debt referred to in said Indemnity Agreement, and
          (ii) rights of contribution between Millennium America Inc. and OCC in
          order to have pro rata treatment if one or both make payment under
          their respective guarantees.

     5.   Agreement between OCC and the Partnership obligating OCC to provide a
          guarantee for 7 years and 30 days after the Closing Date for the
          collection of $420 million of Partnership debt and obligating the
          Partnership to extend or refinance such debt for a term at least
          equivalent to the term of such guarantee.

                                      B-1

<PAGE>
 
     6.   Agreement between OCC and the Partnership obligating the Partnership
          to prepay or restructure the Occidental Assumed Debt within an agreed
          period of time in a manner so that OCC and its Affiliates have no
          liability with respect thereto.


                                      B-2


<PAGE>
 
                                                                      EXHIBIT 21

                                 SUBSIDIARIES

Lyondell FSC, Inc.

Lyondell General Methanol Company

Lyondell Limited Methanol Company

Lyondell Refining Company

Lyondell Petrochemical L.P. Inc.

Lyondell Petrochemical G.P. Inc.

<PAGE>
 
                                                                   EXHIBIT 23(a)

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the incorporation by reference in the following registration
statements of Lyondell Petrochemical Company, Post-Effective Amendment No. 4 to
Registration Statement on Form S-8 (No. 33-26867), Registration Statement on
Form S-8 (No. 33-31564), Registration Statement on Form S-8 (No. 33-32683),
Registration Statement on Form S-8 (No. 33-60785) and Registration Statement on
Form S-8 (No. 333-05399) of our report dated February 16, 1998, except as to the
information presented in Note 23, for  which the date is March 20, 1998, on our
audits of the consolidated financial statements of Lyondell Petrochemical
Company as of December 31, 1997 and 1996 and for each of the three years in the
period ended December 31, 1997, and of our report dated February 6, 1998 on our
audits of the financial statements of LYONDELL-CITGO Refining Company, Ltd. as
of December 31, 1997 and 1996 and for each of the three years in the period
ended December 31, 1997, which reports are included in this Annual Report on
Form 10-K.



Coopers & Lybrand L.L.P.
Houston, Texas
March 25, 1998
<PAGE>
 
          Lyondell Petrochemical Company 401(k) and Savings Plan
          Lyondell Restricted Stock Plan - VSP/MVSP
333-05399 Lyondell Restricted Stock Plan for Non-Employee Directors
          LTIP
          Incentive Stock Option Plan for Employees

<PAGE>
 
                                                                   EXHIBIT 23(b)

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the incorporation by reference in the following registration
statements of Lyondell Petrochemical Company, Post-Effective Amendment No. 4 to
Registration Statement on Form S-8 (No. 33-26867), Registration Statement on
Form S-8 (No. 33-31564), Registration Statement on Form S-8 (No. 33-32683),
Registration Statement on Form S-8 (No. 33-60785) and Registration Statement on
Form S-8 (No. 333-05399) of our report dated February 16, 1998, except as to the
information presented in Note 18, for  which the date is March 20, 1998, on our
audit of the financial statements of Equistar Chemicals, LP as of December 31,
1997 and for  the period from December 1, 1997 (inception) to December 31, 1997,
which report is included in this Annual Report on Form 10-K.



Coopers & Lybrand L.L.P.                           Price Waterhouse LLP
Houston, Texas                                     Morristown, New Jersey
March 25, 1998                                     March 25, 1998
<PAGE>
 
          Lyondell Petrochemical Company 401(k) and Savings Plan
          Lyondell Restricted Stock Plan - VSP/MVSP
333-05399 Lyondell Restricted Stock Plan for Non-Employee Directors
          LTIP
          Incentive Stock Option Plan for Employees

<PAGE>
 
                                                                      EXHIBIT 24

                        LYONDELL PETROCHEMICAL COMPANY

                               POWER OF ATTORNEY
                               -----------------

        Each person whose signature appears below hereby constitutes and
appoints Dan F. Smith, Jeffrey R. Pendergraft and Edward W. Rich, and each of
them, his or her true and lawful attorneys-in-fact and agents, with full power
of substitution and resubstitution, for him or her and in his or her name, place
and stead, in any and all capacities, in connection with any outstanding
securities of Lyondell Petrochemical Company (the "Company"), or any public
offering or other issuance of any securities of the Company authorized by the
Board of Directors of the Company, or by the Executive Committee thereof
pursuant to due authorization by such Board, (1) to execute and file, or cause
to be filed, with the United States Securities and Exchange Commission (the
"Commission"), (A) Registration Statements and any and all amendments (including
post-effective amendments) thereto and to file, or cause to be filed, all
exhibits thereto and other documents in connection therewith as required by the
Commission in connection with such registration under the Securities Act of
1933, as amended, and (B) any report or other document required to be filed by
the Company with the Commission pursuant to the Securities Exchange Act of 1934,
as amended, (2) to execute and file, or cause to be filed, any application for
registration or exemption therefrom, any report or any other document required
to be filed by the Company under the Blue Sky or securities law of any of the
United States and to furnish any other information required in connection
therewith, (3) to execute and file, or cause to be filed, any application for
registration or exemption therefrom under the securities laws of any
jurisdiction outside the United States, including any reports or other documents
required to be filed subsequent to the issuance of such securities, and (4) to
execute and file, or cause to be filed, any application for listing such
securities on the New York Stock Exchange, or any other securities exchange in
any other jurisdiction where
<PAGE>
 
Page 2 of 3

any such securities are proposed to be sold, granting to such attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each
and every act required to be done as he or she might or could do in person,
hereby ratifying and confirming all that such attorneys-in-fact and agents, and
each of them, may lawfully do or cause to be done by virtue of this power of
attorney.  Each person whose signature appears below may at any time revoke this
power of attorney as to himself or herself only by an instrument in writing
specifying that this power of attorney is revoked as to him or her as of the
date of execution of such instrument or at a subsequent specified date.  This
power of attorney shall be revoked automatically with respect to any person
whose signature appears below effective on the date he or she ceases to be a
member of the Board of Directors or an officer of the Company.  Any revocation
hereof shall not void or otherwise affect any acts performed by any attorney-in-
fact and agent named herein pursuant to this power of attorney prior to the
effective date of such revocation.
 
Dated:  March 13, 1998
 
        SIGNATURE                                       TITLE
        ---------                                       -----
 
DAN F. SMITH                     President, Chief Executive Officer and Director
- -------------------------------
Dan F. Smith
(Principal Executive Officer)
 

JEFFREY R. PENDERGRAFT                      Senior Vice President and
- -------------------------------           Chief Administrative Officer
Jeffrey R. Pendergraft
(Principal Financial Officer)
 

EDWARD W. RICH                            Vice President and Treasurer
- -------------------------------
Edward W. Rich
(Principal Accounting Officer)
 
<PAGE>
 
         SIGNATURE                    TITLE
         ---------                    -----
 

WILLIAM T. BUTLER             Chairman and Director
- ----------------------------
Dr. William T. Butler
 
 
 
CURTIS J. CRAWFORD                  Director
- ----------------------------
Curtis J. Crawford
 
 
 
TRAVIS ENGEN                        Director
- ----------------------------
Travis Engen
 
 
 
STEPHEN F. HINCHLIFFE, JR.          Director
- ----------------------------
Stephen F. Hinchliffe, Jr.
 
 
 
DUDLEY C. MECUM                     Director
- ----------------------------
Dudley C. Mecum II
 
 
 
PAUL R. STALEY                      Director
- ----------------------------
Paul R. Staley
 

<TABLE> <S> <C>

<PAGE>
 
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<CASH>                                              86
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                                0
                                          0
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