LYONDELL PETROCHEMICAL CO
10-Q, 1995-05-11
PETROLEUM REFINING
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<PAGE>
 
================================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                             --------------------

                                   FORM 10-Q

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

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1995.

                                      OR

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

FOR THE TRANSITION PERIOD FROM ............ TO  ............

COMMISSION FILE NUMBER 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. EMPLOYER
    INCORPORATION OR ORGANIZATION)                        IDENTIFICATION NO.)

   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

                             --------------------

                                NOT APPLICABLE
             (FORMER NAME, FORMER ADDRESS AND FORMER FISCAL YEAR, 
                         IF CHANGED SINCE LAST REPORT)

     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 FOR SUCH SHORTER PERIOD THAT THE 
REGISTRANT WAS REQUIRED TO FILE SUCH REPORT), AND (2) HAS BEEN SUBJECT TO SUCH 
FILING REQUIREMENTS FOR THE PAST 90 DAYS. YES   X   NO
                                              ----     ----

     NUMBER OF SHARES OF COMMON STOCK, $1.00 PAR VALUE, OUTSTANDING AS OF MARCH 
31, 1995: 80,000,000.

================================================================================

<PAGE>
 
                         PART I. FINANCIAL INFORMATION

                        LYONDELL PETROCHEMICAL COMPANY

                 CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

                       CONSOLIDATED STATEMENT OF INCOME

<TABLE> 
<CAPTION> 

                                                           FOR THE THREE MONTHS
                                                               ENDED MARCH 31
                                                           --------------------
MILLIONS OF DOLLARS EXCEPT PER SHARE AMOUNTS                1995          1994
- --------------------------------------------               ------        ------
<S>                                                        <C>           <C> 
SALES AND OTHER OPERATING REVENUES:
     Unrelated parties                                     $1,084        $  755
     Related parties                                           90            69
                                                           ------        ------
                                                            1,174           824
OPERATING COSTS AND EXPENSES:
     Cost of sales:
          Unrelated parties                                   852           682
          Related parties                                      55            54
     Selling, general and administrative expenses              45            34
                                                           ------        ------
                                                              952           770
                                                           ------        ------
     Operating income                                         222            54

Interest expense                                              (18)          (18)
Interest income                                                 3             1
Minority interest in LYONDELL-CITGO Refining Company Ltd.      (5)           (3)
                                                           ------        ------
     Income before income taxes                               202            34

Provision for income taxes                                     75            12
                                                           ------        ------
     NET INCOME                                            $  127        $   22
                                                           ======        ======
     EARNINGS PER SHARE                                    $ 1.59        $  .27
                                                           ======        ======

</TABLE> 

                See notes to consolidated financial statements.

                                       1

<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

                          CONSOLIDATED BALANCE SHEET

<TABLE> 
<CAPTION> 
                                                        MARCH 31    DECEMBER 31
MILLIONS OF DOLLARS                                       1995          1994
- -------------------                                     --------    -----------
<S>                                                     <C>         <C> 
ASSETS
Current assets:
  Cash and cash equivalents                              $  207        $   52
  Restricted cash and cash equivalents (Note 2)              36            42
  Accounts receivable:
    Trade                                                   300           331
    Related parties                                          26            29
  Inventories                                               251           229
  Prepaid expenses and other current assets                  10            14
                                                         ------        ------
      Total current assets                                  830           697
                                                         ------        ------
Fixed assets:
  Property, plant and equipment                           2,909         2,810
  Less accumulated depreciation and amortization          1,943         1,930
                                                         ------        ------
                                                            966           880
Deferred charges and other assets                            85            86
                                                         ------        ------
Total assets                                             $1,881        $1,663
                                                         ======        ======
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable:
    Trade                                                $  294        $  287
    Related parties                                           1             1
  Income taxes payable                                       63            18
  Notes payable                                              --            20
  Current maturities of long-term debt                       10            10
  Other accrued liabilities                                  98            97
                                                         ------        ------
    Total current liabilities                               466           433
                                                         ------        ------
Long-term debt                                              707           707
Other liabilities and deferred credits                       88            83
Deferred income taxes                                       103           109
Commitments and contingencies (Note 5) 
Minority interest                                           345           268
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 and outstanding             80            80
  Additional paid-in capital                                158           158
  Accumulated deficit                                       (66)         (175)
                                                         ------        ------
    Total stockholders' equity                              172            63
                                                         ------        ------
Total liabilities and stockholders' equity               $1,881        $1,663
                                                         ======        ======
</TABLE> 

                See notes to consolidated financial statements.

                                       2
<PAGE>
 
                        LYONDELL PETROCHEMICAL COMPANY

                     CONSOLIDATED STATEMENT OF CASH FLOWS

<TABLE> 
<CAPTION> 
                                                     FOR THE THREE MONTHS ENDED
                                                                MARCH 31
                                                     -------------------------- 
MILLIONS OF DOLLARS                                     1995            1994
- -------------------                                   --------        ---------
<S>                                                     <C>           <C> 
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income                                           $  127          $   22
  Adjustments to reconcile net income to net
   cash provided by operating activities:
     Depreciation and amortization                         18              15
     Deferred taxes                                        (8)              3
     (Increase) decrease in accounts receivable            34             (35)
     (Increase) decrease in inventory                     (22)              1
     Increase in accounts payable                           9              26
     Net change in other working capital accounts          51             (10)
     Minority interest                                      5               3
     Other                                                  2               4
                                                       ------          ------
       Net cash provided by operating activities          216              29
                                                       ------          ------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Additions to fixed assets                              (101)            (32)
  Purchases of short-term investments                      --             (19)
  Proceeds from sales of short-term investments            --               3
                                                       ------          ------
       Net cash used in investing activities             (101)            (48)
                                                       ------          ------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Minority owner contribution                              72              10
  Net repayments of short-term debt                       (20)             (2)
  Repayments of long-term debt                             --              (3)
  Dividends paid                                          (18)            (18)
                                                       ------          ------
       Net cash provided by (used in) financing
        activities                                         34             (13)
                                                       ------          ------
INCREASE (DECREASE) IN CASH, RESTRICTED CASH
 AND CASH EQUIVALENTS                                     149             (32)
Cash, restricted cash and cash equivalents at 
 beginning of period                                       94             113
                                                       ------          ------
Cash, restricted cash and cash equivalents at 
 end of period                                         $  243          $   81
                                                       ======          ======

</TABLE> 

                See notes to consolidated financial statements.

                                       3

<PAGE>
 
                         LYONDELL PETROCHEMICAL COMPANY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

1.  BASIS OF PREPARATION

The accompanying unaudited consolidated financial statements have been prepared
in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Rule 10-01 of
Regulation S-X.  Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements.  In the opinion of management, all adjustments, consisting
only of normal, recurring adjustments considered necessary for a fair
presentation, have been included.  For further information, refer to the
consolidated financial statements and notes thereto for the year ended December
31, 1994 included in the Lyondell Petrochemical Company ("Company") 1994 Annual
Report and the Annual Report on Form 10-K pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934.  The year-end condensed balance sheet data was
derived from audited financial statements but does not include all disclosures
required by generally accepted accounting principles. Certain amounts from prior
periods have been reclassified to conform to current period presentation.


2.  RESTRICTED FUNDS

As of March 31, 1995 and December 31, 1994, cash in the amount of $36 million
and $42 million, respectively, was restricted for use in connection with
LYONDELL-CITGO Refining Company Ltd. ("LCR") capital projects, including the
Refinery upgrade project, and other expenditures as determined by the LCR
owners.

Presented below is a reconciliation of changes in restricted funds for the
three-month period ended March 31, 1995:
<TABLE>
<CAPTION>
 
 
<S>                                                                 <C>
Restricted - cash and cash equivalents
  at December 31, 1994                                              $ 42
 
Minority owner contributions                                          72
 
Interest on restricted funds                                           1
 
Additions to fixed assets:
  Refinery upgrade project                                           (71)
  Refining segment - other                                            (8)
                                                                    ----
Restricted - cash and cash equivalents
  at March 31, 1995                                                 $ 36
                                                                    ====
  
</TABLE>

                                       4
<PAGE>
 
3.  INVESTMENTS

As of March 31, 1995, the Company held approximately $111 million of investments
in debt securities composed primarily of commercial paper which were classified
as cash equivalents. The cost of securities held at March 31, 1995 approximated
their estimated fair value and were classified as available-for-sale.

The Company realized no gains or losses on sales of securities during the three-
month period ended March 31, 1995. All securities held by the Company as of
March 31, 1995 have remaining maturities of less than one year.

 
4. INVENTORIES

The categories of inventory and their book values at March 31, 1995 and December
31, 1994 were:

<TABLE>
<CAPTION>
 
     MILLIONS OF DOLLARS            1995   1994
     -------------------            -----  -----
     <S>                            <C>    <C>
     Crude oil                      $  46  $  62
     Refined products                  34     30
     Petrochemicals                   134    102
     Materials and supplies            37     35
                                    -----  -----
                                    $ 251  $ 229
                                    =====  =====
</TABLE>

5.  COMMITMENTS AND CONTINGENCIES

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 connection with the transfer of assets and liabilities from Atlantic
Richfield Company ("ARCO") to the Company, the Company agreed to assume certain
liabilities arising out of the operation of the Company's integrated
petrochemical 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 has 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 indemnified the Company under the Cross-Indemnity Agreement with respect to
other claims or liabilities and other matters of litigation not related to the
assets or business included in the consolidated financial statements. ARCO has
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 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 Company's financial
statements.

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.

                                       5
<PAGE>
 
5. COMMITMENTS AND CONTINGENCIES - (CONTINUED)

Subject to the terms of the Cross-Indemnity Agreement, the Company is currently
contributing funds to the cleanup of two waste sites (French Ltd. and Brio, both
of which are 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"),
formerly the Texas Water Commission, for assessment and remediation of
groundwater and soil contamination at the Refinery.

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 has received a notice of violation
from the TNRCC regarding the two streams and consented to pay a fine of $10,200.
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 Company has been notified that the EPA will proceed
with a separate investigation. However, the Company continues to believe that
none of the aspects of the matters described above will subject the Company to
criminal liability or have a material adverse effect on the Company's business
or financial statements.

The Company has accrued $17 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
above will not have a material adverse effect on the consolidated financial
statements or liquidity of the Company, although 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.

6.  DIVIDENDS

On March 15, 1995, the Company paid a regular quarterly dividend of $.225 per
share to stockholders of record on February 24, 1995. Additionally, on April 21,
1995, the Board of Directors declared a regular quarterly dividend of $.225 per
share of common stock, payable June 15, 1995 to stockholders of record on May
25, 1995.

7.  EARNINGS PER SHARE

Earnings per share for all periods presented are computed based on the weighted
average number of shares outstanding for the periods, which was 80,000,000
shares.

                                       6
<PAGE>
 
8.  SUBSEQUENT EVENTS

On April 17, 1995, the Company announced that it had signed an agreement with
Occidental Chemical Corporation, an affiliate of Occidental Petroleum
Corporation, to acquire Occidental Chemical Corporation's Alathon(R) high-
density polyethylene ("HDPE") business for $350 million plus approximately $60
million for inventory. Assets involved in the transaction include resin
production facilities at Victoria and Matagorda, Texas, and associated research
and development activities. These facilities have a combined annual production
capacity of approximately 1.5 billion pounds of HDPE. The transaction closed on
May 1, 1995. The Company financed the acquisition from internal cash and by
borrowing from its existing credit facilities.

LCR entered into two credit facilities, dated as of May 5, 1995, totaling $520
million with a group of banks with The Bank of New York as agent. The first
facility is a $70 million, 364 day revolving credit facility which replaces
LCR's existing $70 million revolving credit facility and will be utilized for
general corporate purposes, including letters of credit, unrelated to the
Refinery upgrade project. Upon LCR's request, this facility may be increased to
$100 million and/or extended upon consent of the bank group. The second facility
is a $450 million, five year term credit facility which will be used in
connection with the Refinery upgrade project.

                                       7
<PAGE>
 
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS

GENERAL

Lyondell Petrochemical Company (the "Company" or "Lyondell") operates in two
business segments: petrochemicals and refining. The petrochemical segment
consists of olefins including ethylene, propylene, butadiene, butylenes and
specialty products; polyolefins including polypropylene and low density
polyethylene; aromatics produced at the Channelview petrochemical complex
("Channelview Complex") including benzene and toluene; methanol and refinery
blending stocks.

On July 1, 1993, the Company and CITGO Petroleum Corporation ("CITGO") announced
the commencement of operations of LYONDELL-CITGO Refining Company Ltd. ("LCR"),
a new entity owned by subsidiaries of the Company and CITGO.  LCR owns and
operates the refining business formerly owned by the Company, including the
full-conversion refinery ("Refinery").  LCR is undertaking a major upgrade
project at the Refinery to enable the facility to process substantial additional
volumes of very heavy crude oil. CITGO is providing a major portion of the funds
for the upgrade project and has provided in excess of $100 million for funding
other capital projects. Definitive cost engineering for the upgrade is
substantially complete, and at the present time LCR management anticipates the
cost for the project, which is scheduled to be completed in late 1996, will be
approximately $980 million, which includes an allowance for contingency costs.

On July 1, 1993, LCR entered into a long-term crude oil supply contract ("Crude
Supply Contract") with LAGOVEN, S.A., an affiliate of CITGO.  In addition, under
terms of a long-term product sales agreement ("Products Agreement"), CITGO is
purchasing approximately 80 to 85 percent of the refined products produced at
the Refinery.  Both LAGOVEN and CITGO are subsidiaries of Petroleos de
Venezuela, S.A., the national oil company of Venezuela.

Prior to completion of the upgrade project, the Crude Supply Contract requires
LCR to purchase and LAGOVEN to supply a minimum of 125,000 barrels per day of
heavy Venezuelan crude oil.  The 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; (ii) certain actual costs, including crude oil
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
costs are adjusted periodically based on inflation rates for specific deemed
cost components.  Adjustments to margins track, but are less than, inflation
rates.  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.

Notwithstanding the limitations discussed above, however, the Crude Supply
Contract is designed to reduce the inherent volatility of earnings and cash flow
of LCR's refining operations irrespective of market fluctuations of either crude
oil or refined products. Specifically, should the market value of refined
products "deemed" to be produced from the Venezuelan crude oil increase, 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 the market
volatility of either refined products or crude oil.  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.

                                       8
<PAGE>
 
The refining segment consists of refined petroleum products, including gasoline,
heating oil and jet fuel; aromatics produced at the Refinery, including benzene,
toluene, paraxylene and orthoxylene; lubricants, including industrial and motor
oils; 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 refining segment by allowing the Company
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 amounted to $74 million and $61 million for the three-month periods
ended March 31, 1995 and 1994, respectively.

The following table sets forth the Company's major product volumes sold for the
periods indicated.  Sales volumes include production, purchases of products for
resale, propylene production from the product flexibility unit and draws from
inventory.

<TABLE>
<CAPTION>
 
                                                THREE MONTHS
                                                   ENDED
                                                  MARCH 31
                                              ----------------
                                              1995       1994
                                              -----      -----
<S>                                           <C>        <C>
SELECTED PETROCHEMICAL PRODUCTS (MILLIONS)
  (EXCLUDING INTERSEGMENT SALES):
Ethylene, propylene and polyolefins (lbs.)    1,513      1,503
Other olefins (lbs.)                            294        237
Methanol (gallons)                               51         46
Aromatics (gallons)                              41         36
 
REFINED PRODUCTS (THOUSAND BARRELS PER DAY)
  (EXCLUDING INTERSEGMENT SALES):
Gasoline                                        105        112
Heating oil (no. 2 distillate)                   55         50
Jet fuel                                         30         24
Aromatics                                         9          9
Other refined products                           55         44
                                              -----      -----
   Total refined products volumes               254        239
                                              =====      =====
</TABLE>

Summarized below is the segment data for the Company.  Intersegment sales
between the petrochemical and refining segments include olefins feedstocks
produced at the Refinery and gasoline blending stocks produced at the
Channelview Complex and were made at prices that were based on current market
values.

<TABLE>
<CAPTION>
 
                                        THREE MONTHS ENDED
                                             MARCH 31
                                       --------------------
(MILLIONS OF DOLLARS)                     1995       1994
- ---------------------                  ----------  --------
<S>                                    <C>         <C> 
SALES AND OTHER OPERATING REVENUES:
   Petrochemical segment                  $  646     $ 384
   Refining segment                          629       535
   Intersegment sales                       (101)      (95)
                                          ------     -----
                                          $1,174     $ 824
                                          ======     =====
 
COST OF SALES:
   Petrochemical segment                  $  437     $ 335
   Refining segment                          571       496
   Intersegment purchases                   (101)      (95)
                                          ------     -----
                                          $  907     $ 736
                                          ======     =====
</TABLE>

                                       9
<PAGE>
 
<TABLE>
<CAPTION>
                                           THREE MONTHS ENDED
                                                MARCH 31
                                           -----------------
(MILLIONS OF DOLLARS)                       1995      1994
- ---------------------                     --------  --------
<S>                                       <C>       <C>
 
SELLING, GENERAL AND ADMINISTRATIVE
 EXPENSES:
   Petrochemical segment                    $  13       $  10
   Refining segment                            15          13
   Unallocated                                 17          11
                                            -----       -----
                                            $  45       $  34
                                            =====       =====
 
OPERATING INCOME:
   Petrochemical segment                    $ 196       $  39
   Refining segment                            43          26
   Unallocated                                (17)        (11)
                                            -----       -----
                                            $ 222       $  54
                                            =====       =====
</TABLE> 
 
Summarized below are intersegment sales for the two segments.

<TABLE> 
<CAPTION>  
                                          THREE MONTHS ENDED
                                               MARCH 31
                                          ------------------
(MILLIONS OF DOLLARS)                       1995      1994
- ---------------------                     -------    -------
 <S>                                       <C>        <C> 
   Petrochemical segment                    $  46       $  44
   Refining segment                            55          51
                                            -----       -----
                                            $ 101       $  95
                                            =====       =====
 
</TABLE>

RESULTS OF OPERATIONS

OVERVIEW

Net income for the first quarter of 1995 was $127 million or $1.59 per share
compared to a net income of $22 million or $.27 per share for the first quarter
of 1994.  The $105 million improvement was primarily due to higher petrochemical
margins and to a lesser extent higher refining and aromatics margins.

Net income was $24 million higher for the first quarter of 1995 compared to the
fourth quarter of 1994.  This increase was primarily caused by higher refining
margins and sales volumes and higher olefins margins and methanol sales volumes.


PETROCHEMICAL SEGMENT

REVENUES   Sales and other operating revenues for the first quarter of 1995 were
$646 million compared to $384 million for the first quarter of 1994.  The $262
million increase was due to higher olefins and polyolefins sales prices
reflecting continued strong market conditions for petrochemicals that resulted
from the high U.S. economic growth rate in 1994 and an improving worldwide
economy.  Additionally, revenues were higher due to higher methanol sales prices
which were caused by the improvement in the worldwide economy and increased use
of MTBE, of which methanol is a significant component, as well as industry
supply disruptions.

COST OF SALES   Cost of sales was $437 million in the first quarter of 1995
compared to $335 million in the first quarter of 1994, an increase of $102
million.  This increase was primarily due to higher olefins feedstock costs
resulting from higher raw material prices.  Olefins raw material costs were
higher due to higher worldwide crude oil prices.

                                       10
<PAGE>
 
SELLING EXPENSES   Selling expenses for the first quarter of 1995 compared to
the first quarter of 1994 were higher by $3 million.  This increase was
primarily caused by higher product delivery and storage costs.

OPERATING INCOME   Operating income for the first quarter of 1995 was $196
million compared to an operating income of $39 million in the first quarter of
1994.  The $157 million increase was primarily due to higher petrochemical sales
margins.  Improved olefins sales margins resulted primarily from higher olefins
sales prices, partially offset by higher raw material prices.  Olefins sales
prices were higher due to higher industry-wide demand caused by the improved
worldwide economies.  Olefins raw material prices were higher due to the higher
crude oil prices.  Contributing to the improved operating income were higher
methanol sales margins.  Methanol sales margins were higher primarily due to
higher sales prices caused by the improved worldwide economies, increased use of
MTBE and industry supply disruptions.

Operating income for the first quarter of 1995 compared to the fourth quarter of
1994 increased $10 million.  The increase was primarily due to higher olefins
sales margins, partially offset by lower olefins sales volumes.  Contributing to
the increase was higher methanol sales volumes, partially offset by lower
methanol sales margins.  Olefins sales margins continued to improve during the
first quarter due to sales prices increasing faster than feedstock costs.
Olefins sales volumes were lower due, in part, to a ten day shutdown of one of
the olefins units for unscheduled maintenance.  Methanol sales volumes were
higher due to higher production resulting from a debottleneck performed on the
methanol unit in 1994, the full impact of which was not realized until the first
quarter of 1995.  Methanol sales margins were lower due to a significant decline
in prices late in the first quarter of 1995 due to uncertainty about MTBE demand
for reformulated gasoline and increasing methanol supply.


REFINING SEGMENT

REVENUES  Sales and other operating revenues for the first quarter of 1995 were
$629 million compared to $535 million for the first quarter of 1994, an increase
of $94 million.  The increase was primarily due to higher sales prices for both
refined products and aromatics and higher prices for crude oil resales.  Refined
products sales prices were higher generally due to the higher crude oil prices.
Aromatics sales prices increased primarily due to higher demand caused by the
improved economy.

COST OF SALES  Cost of sales was $571 million during the first quarter of 1995
compared to $496 million during the first quarter of 1994, an increase of $75
million.  The increase was primarily due to higher crude oil and other feedstock
prices.

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES  Selling, general and
administrative expenses were $15 million in the first quarter of 1995, an
increase of $2 million compared to the first quarter of 1994. This was due to an
approximately $1 million increase in both compensation and selling expenses.
The increase in selling expenses related to higher sales of aromatics and
refined products.

OPERATING INCOME  Operating income for the first quarter of 1995 was $43 million
compared to $26 million for the first quarter of 1994.  The $17 million increase
was primarily due to higher refined products and aromatics margins.  Refined
products margins were higher due to increased volumes of Venezuelan crude oil
purchased under the Crude Supply Contract and processed both in the cracking and
coking modes.  The increase in the volume of Venezuelan crude oil processed was
partially attributable to the additional inventory that was available for
processing as a result of turnarounds at the Refinery during the fourth quarter
of 1994.  Aromatics margins were higher due to higher sales prices, particularly
for paraxylene and orthoxylene.

Operating income for the first quarter of 1995 compared with the fourth quarter
of 1994 increased $44 million.  The increase was primarily due to higher refined
products sales margins and volumes and to improved profitability for aromatics.
The refined products sales margin increase was due to the higher
                                       11
<PAGE>
 
volumes of Venezuelan crude oil processed during the first quarter of 1995. The
change in production volume was due to downtime of two major production units
during the fourth quarter of 1994 and the increased production efficiency
realized during the first quarter of 1995 resulting from the turnarounds.

UNALLOCATED

GENERAL AND ADMINISTRATIVE EXPENSES  General and administrative expenses were
$17 million in the first quarter of 1995 compared to $11 million in the first
quarter of 1994, an increase of $6 million.  This increase was primarily due to
a charge for management incentive compensation related expenses for 1994
relating to a newly-adopted management compensation plan.

INTEREST INCOME  Interest income was $3 million during the first quarter of 1995
compared to $1 million during the first quarter of 1994.  The $2 million
increase was caused by higher levels of cash available for investment and higher
interest rates.

MINORITY INTEREST IN LYONDELL-CITGO REFINING COMPANY LTD.  Minority interest was
$5 million in the first quarter of 1995, representing CITGO's allocated share of
LCR's net income.

INCOME TAX  The effective income tax rate during the first quarter of 1995 from
continuing operations was 37 percent. State income tax was the primary
difference between the effective tax rate and the 35 percent federal statutory
rate.

FINANCIAL CONDITION

Lyondell's cash flows from operating activities for the first quarter of 1995
were $216 million, a strong improvement over the $29 million generated during
the first quarter of 1994. This increase was primarily attributable to the $105
million increase in net income over the 1994 period. Cash flows associated with
investing activities during the three months ended March 31, 1995 included
capital expenditures of $101 million, of which $71 million was for the upgrade
project at the Refinery and was funded by contributions from CITGO, the minority
owner, and $7 million was for environmentally related projects. As of March 31,
1995, $36 million of cash was restricted for use in LCR capital projects,
including the Refinery upgrade project, and other expenditures as determined by
the LCR owners. Cash flows associated with financing activities during the three
months ended March 31, 1995 included $20 million for the repayment of borrowings
by LCR under its working capital facility and $18 million of dividend payments.

On April 21, 1995, the Board of Directors declared a regular quarterly dividend
of $.225 per share of common stock, payable June 15, 1995 to stockholders of
record on May 25, 1995.


CURRENT BUSINESS OUTLOOK

Lyondell's first quarter 1995 results reflect continued strong markets for its
petrochemical products and the most profitable quarter for the refining segment
since LCR was formed in 1993.  Completion of maintenance and modifications
conducted on key refining units in the fourth quarter of 1994 as well as the
resulting build-up of heavy Venezuelan crude oil inventories led to record
processing rates for heavy Venezuelan crude oil which resulted in the record
contribution from the refining segment in the first quarter despite poor
industry margins. As the Company enters the second quarter, demand and prices
for its olefins products remain favorable. However, methanol prices continue to
decline from the peak experienced at the beginning of 1995. Also in the second
quarter, refining industry conditions have shown some improvement and
management expects continued good performance in 1995 from LCR, although it will
be difficult for LCR to repeat the first quarter results due to lower
Venezuelan crude oil processing rates and unit downtime and maintenance during
the second quarter.

                                       12
<PAGE>
 
On May 1, 1995, Lyondell completed the acquisition of Occidental Chemical
Corporation's Alathon(R) high-density polyethylene ("HDPE") business for $350
million plus approximately $60 million for inventory. The acquisition was funded
from the Company's cash balances and borrowings from its credit facilities.
Assets involved in the transaction include resin production facilities at
Victoria and Matagorda, Texas and associated research and development
activities. These facilities have a combined annual production capacity of
approximately 1.5 billion pounds of HDPE. In addition, Lyondell acquired the
rights to the Alathon(R) trademark. The business employs approximately 350
people. Management expects that this acquisition will provide important
additional downstream integration which is a key part of the Company's strategic
plan to support its earnings during the trough of the petrochemical business
cycle.

HDPE is used to make plastic films and resins for a wide variety of consumer
goods.  Among the products produced at the facilities involved in the
transaction is a high molecular weight film resin that is generally regarded as
the benchmark for the industry.  As a part of the agreement, Occidental Chemical
Corporation will supply ethylene, the principal feedstock for HDPE, to these
plants for a transitional period.  Ultimately, Lyondell plans to supply ethylene
to these facilities primarily from its Channelview Complex.

Management believes that the low cost, operating flexibility and large
production capacity of the Company's petrochemical business and the addition of
the Alathon(R) business position the Company to capitalize on the current
favorable petrochemical business environment. During most of 1994 and through
the first quarter of 1995, the domestic olefins industry operated at close to
maximum available capacity. Although additional olefins capacity came on-stream
during the first quarter of 1995, it did not materially affect the supply and
demand balance due in part to planned and unplanned industry downtime. Favorable
olefins market conditions continue into the second quarter.

In 1994 and early in the first quarter of 1995, the methanol market benefited
from increased product demand, including rapid growth in its use for MTBE, and
also from production disruptions which limited supply.  This led to
unprecedented prices and margins in the methanol business.  Late in the first
quarter of 1995 and continuing into the second quarter, increased uncertainty
about MTBE demand for reformulated gasoline and increasing methanol supply has
exerted significant downward pressure on methanol prices. The outlook for
methanol in 1995 and future years is uncertain but market conditions are
unlikely to be as strong as they were late in 1994 and early in 1995.

Profitability and cash flows for the petrochemical 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 turnarounds.
Turnarounds on major units can have significant financial impacts due to the
repair and maintenance costs incurred as well as the associated loss of
production, resulting in lower profitability during the period of the
turnaround.  The Company currently intends to perform a turnaround on one of its
two olefins units during the second half of 1995.  During this turnaround, work
will be completed to debottleneck the unit which will increase its capacity by
approximately 120 million pounds per year.

The Company believes that business conditions will be such that cash balances,
cash generated from operating activities and existing lines of credit will be
adequate to meet future cash requirements for scheduled debt repayments,
necessary capital expenditures and to sustain for the reasonably foreseeable
future the regular quarterly dividend.  However, the Company continually
evaluates its cash requirements and allocates cash in order to maximize
stockholder returns.

                           __________________________

Management cautions against projecting any future results based on present or
prior earnings levels because of the cyclical nature of the refining and
petrochemical industries and uncertainties associated with the United States and
worldwide economies and current and potential United States governmental
regulatory actions.

                                       13
<PAGE>
 
                           PART II. OTHER INFORMATION


ITEM 1. LEGAL PROCEEDINGS

     Reference is made to the disclosure on page 21 of the Company's Annual
     Report on Form 10-K for the year ended December 31, 1994 relating to the
     Benzene NESHAPS compliance issue.  The Company has been advised
     that the EPA intends to proceed with a separate investigation.

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

     The Company's annual meeting of stockholders is scheduled for June 2, 1995.
     Results of stockholder votes on Company proposals will be included in the
     Company's Quarterly Report on Form 10-Q for the period ending June 30,
     1995.

ITEM 5. OTHER INFORMATION

     On March 24, 1995 the size of the Board of Directors was expanded to seven
     and D. Travis Engen was elected to the Company's Board of Directors,
     effective as of April 1, 1995.
 
ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

     (a)  Exhibits
 
          4.4(a)    LYONDELL-CITGO Refining Company Ltd. $70,000,000 Revolving
                    Credit Agreement dated as of May 5, 1995.

          4.4(b)    LYONDELL-CITGO Refining Company Ltd. $450,000,000 Credit
                    Agreement dated as of May 5, 1995.

          4.5(a)    Amendment No. 1, dated as of April 1, 1995, to Lyondell
                    Petrochemical Company $400,000,000 Credit Agreement.

          10.28(d)  Amendment No. 1, dated as of April 28, 1995, to the Amended
                    and Restated Limited Liability Company Regulations of
                    LYONDELL-CITGO Refining Company Ltd.

          27        Financial Data Schedule 
     (b)  Reports on Form 8-K

          The following Current Reports on Form 8-K were filed during the
          quarter ended March 31, 1995 and through the date hereof:

<TABLE>
<CAPTION>
 
Date of Report              Item No.  Financial Statements
- --------------              --------  --------------------
<S>                         <C>       <C>
 
April 17, 1995                 5             None
 
May 11, 1995                   2             Yes
 
</TABLE>

                                       14
<PAGE>
 
                                   SIGNATURE



Pursuant to the requirements 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
                                                (Registrant)


Dated:  May 11, 1995                            /s/ JOSEPH M. PUTZ
                                         -------------------------------
                                                    (Signature)
                                                   Joseph M. Putz
                                           Vice President and Controller
                                           (Duly Authorized Officer and
                                           Principal Accounting Officer)

                                       15

<PAGE>

===============================================================================
                                                                  Exhibit 4.4(a)
 
                                  $70,000,000

                           REVOLVING CREDIT AGREEMENT

                            DATED AS OF MAY 5, 1995


                                     AMONG


                     LYONDELL-CITGO REFINING COMPANY LTD.,


                            THE LENDERS FROM TIME TO
                              TIME PARTIES HERETO,

                            THE BANK OF NOVA SCOTIA,
                                CREDIT LYONNAIS,
                       THE FIRST NATIONAL BANK OF CHICAGO
                                      AND
                      THE INDUSTRIAL BANK OF JAPAN, LTD.,

                                 AS CO-AGENTS

                                      AND

                             THE BANK OF NEW YORK,

                             AS AGENT AND AS ISSUER

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<S>               <C>                                                 <C>
ARTICLE I.        DEFINITIONS........................................   1
    Section 1.01  Certain Defined Terms..............................   1
    Section 1.02  Other Definitional Provisions......................  24
    Section 1.03  Captions...........................................  25

ARTICLE II.       CREDIT FACILITY....................................  25
    Section 2.01  The Facility.......................................  25
    Section 2.02  Making the Loans...................................  28
    Section 2.03  Letters of Credit..................................  29
    Section 2.04  Reduction of Commitments...........................  34
    Section 2.05  Fees...............................................  34
    Section 2.06  Interest...........................................  35
    Section 2.07  Voluntary Interest Rate Conversion.................  37
ARTICLE III.      PAYMENTS, PREPAYMENTS, INCREASED COSTS
                  AND TAXES..........................................  37
    Section 3.01  Payments and Computations..........................  37
    Section 3.02  Mandatory Prepayments..............................  38
    Section 3.03  Voluntary Prepayments..............................  38
    Section 3.04  Funding Losses Relating to Eurodollar Rate Loans...  39
    Section 3.05  Increased Costs; Capital Adequacy..................  40
    Section 3.06  Taxes..............................................  41
    Section 3.07  Substitution of Lender.............................  43

ARTICLE IV.       CONDITIONS TO LOANS; LETTERS OF CREDIT;
                  CONVERSIONS........................................  44
    Section 4.01  Conditions to Initial Loans and Initial Letter of
                  Credit.............................................  44
    Section 4.02  Conditions to Each Borrowing.......................  46
    Section 4.03  Conditions to Each Letter of Credit................  46
    Section 4.04  Conditions to Conversions..........................  47
    Section 4.05  Deemed Fulfilled Conditions........................  47

ARTICLE V.        REPRESENTATIONS AND WARRANTIES OF
                  THE BORROWER.......................................  47
    Section 5.01  Organization; Power; Qualification.................  48
    Section 5.02  Authorization; Enforceability; Absence of
                  Conflicts; Required Consents.......................  48
    Section 5.03  Compliance With Laws...............................  49
    Section 5.04  No Defaults........................................  49
    Section 5.05  Litigation.........................................  49
    Section 5.06  Financial Statements; Disclosure...................  49
    Section 5.07  Taxes..............................................  50
    Section 5.08  Government Regulation..............................  51
</TABLE>

                                       i
<PAGE>
 
<TABLE>
<S>               <C>                                                  <C>
    Section 5.09  Employee Benefit Plans.............................  51
    Section 5.10  Title to Property; Leases..........................  52
    Section 5.11  Labor Matters......................................  52
    Section 5.12  Intellectual Property..............................  52
    Section 5.13  Use of Proceeds....................................  52

ARTICLE VI.       FINANCIAL STATEMENTS AND INFORMATION...............  53
    Section 6.01  Reporting Requirements.............................  53
    Section 6.02  Books and Records..................................  56
    Section 6.03  Visits, Inspections and Discussions................  56

ARTICLE VII.      CERTAIN COVENANTS..................................  56
    Section 7.01  Maintenance of Existence and Properties............  56
    Section 7.02  Compliance With Governmental Requirements..........  57
    Section 7.03  Payment of Taxes and Claims........................  57
    Section 7.04  Insurance; Casualty................................  58
    Section 7.05  Liens..............................................  58
    Section 7.06  Restricted Payments................................  58
    Section 7.07  Limitations on Mergers, Etc........................  59
    Section 7.08  Disposition of Assets..............................  59
    Section 7.09  Indebtedness.......................................  60
    Section 7.10  Transactions With Affiliates.......................  61
    Section 7.11  Limitation on Restrictive Covenants................  61
    Section 7.12  Issuance or Disposition of Capital Securities......  61
    Section 7.13  Investments........................................  61
    Section 7.14  Business...........................................  62
    Section 7.15  Fiscal Year........................................  62
    Section 7.16  Financial Covenants................................  62
    Section 7.17  Certain Material Agreements........................  62
    Section 7.18  Use of Proceeds....................................  63

ARTICLE VIII.     DEFAULT............................................  64
    Section 8.01  Events of Default..................................  64
    Section 8.02  Remedies...........................................  68
    Section 8.03  Application of Proceeds............................  69
    Section 8.04  Cash Collateral....................................  69
    Section 8.05  Set-Off; Suspension of Payment and Performance.....  70
    Section 8.06  Sharing of Recoveries..............................  70

ARTICLE IX.       THE AGENT..........................................  70
    Section 9.01  Appointment and Powers.............................  70
    Section 9.02  Limitation on Agent's Liability....................  71
    Section 9.03  Defaults...........................................  71
    Section 9.04  Rights as a Lender and as Issuer...................  71
    Section 9.05  Indemnification....................................  72
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<S>               <C>                                                  <C>
    Section 9.06  Non-Reliance on Agent and Other Lenders............  72
    Section 9.07  Resignation of the Agent...........................  72
    Section 9.08  CERTAIN INTENTIONS.................................  73

ARTICLE X.        MISCELLANEOUS......................................  73
    Section 10.01 Notices and Deliveries.............................  73
    Section 10.02 Expenses; Indemnification..........................  75
    Section 10.03 Rights Cumulative..................................  77
    Section 10.04 Confidentiality....................................  77
    Section 10.05 Amendments; Waivers................................  79
    Section 10.06 Assignments and Participations.....................  80
    Section 10.07 Governing Law......................................  81
    Section 10.08 Judicial Proceedings; WAIVER OF JURY TRIAL.........  82
    Section 10.09 Severability of Provisions.........................  83
    Section 10.10 Counterparts; Integration; Binding Effect..........  83
    Section 10.11 Entire Agreement...................................  83
    Section 10.12 Successors and Assigns.............................  83

ANNEXES, SCHEDULES AND EXHIBITS

Annex A            - Lender Information
Schedule A         - ERISA Assumptions
Exhibit A          - Form of Note
Exhibit 2.01(b)    - Form of Extension Request
Exhibit 2.01(c)-1  - Form of Notice of Commitment Increase
Exhibit 2.01(c)-2  - Form of Supplement to Credit Agreement
Exhibit 2.02       - Form of Notice of Borrowing
Exhibit 2.03(c)-1  - Form of Commercial Letter of Credit Reimbursement
                      Agreement
Exhibit 2.03(c)-2  - Form of Standby Letter of Credit Reimbursement Agreement
Exhibit 2.03(d)    - Form of Letter of Credit Request
Exhibit 2.07       - Form of Notice of Conversion
Exhibit 4.01(b)-1  - Form of Secretary's Certificate
Exhibit 4.01(b)-2  - Form of Amendment to the Regulations
Exhibit 4.01(f)-1  - Form of Opinion of Counsel to Borrower
Exhibit 4.01(f)-2  - Form of Opinion of Counsel to Borrower
Exhibit 4.01(g)    - Form of Officer's Certificate
Exhibit 6.01(a)    - Form of Quarterly Compliance Certificate
Exhibit 6.01(b)    - Form of Annual Compliance Certificate
Exhibit 10.04(c)-1 - Form of Assignee or New Lender Confidentiality Agreement
Exhibit 10.04(c)-2 - Form of Participant Confidentiality Agreement
Exhibit 10.04(c)-3 - Form of Outside Representative Confidentiality Agreement
Exhibit 10.06(a)   - Form of Assignment Agreement
</TABLE>

                                      iii
<PAGE>
 
                          REVOLVING CREDIT AGREEMENT

                            dated as of May 5, 1995


          LYONDELL-CITGO REFINING COMPANY LTD., a Texas limited liability
company, the LENDERS listed on the signature pages hereof and any Lender
hereafter becoming a party hereto in accordance with the provisions hereof, THE
BANK OF NOVA SCOTIA, CREDIT LYONNAIS, THE FIRST NATIONAL BANK OF CHICAGO and THE
INDUSTRIAL BANK OF JAPAN, LTD., as Co-Agents, and THE BANK OF NEW YORK, as Agent
and as Issuer, agree as follows:

                                   ARTICLE I.

                                  DEFINITIONS

          Section 1.01   Certain Defined Terms.  As used in this Revolving
Credit Agreement, the following terms have the meanings assigned to them below:

          "Accumulated Funding Deficiency" has the meaning specified in Section
     302 of ERISA.

          "Adjusted Eurodollar Rate" means, for any day in an Interest Period
     for any Eurodollar Loan, an interest rate per annum equal to the sum of (a)
     the quotient, expressed as a percentage, resulting from the division of (i)
     the Eurodollar Rate for such Interest Period by (ii) the percentage equal
     to 100% minus the Eurodollar Rate Reserve Percentage in effect on such day,
     plus (b) the Applicable Margin in effect on such day.

          "Adjustment Percentage" means, as of any Commitment Increase Effective
     Date, the fraction, expressed as a percentage, (a) the numerator of which
     is the aggregate principal amount of Loans outstanding immediately after
     giving effect, without duplication of amounts, to all Borrowings and
     prepayments, if any, effected on such Commitment Increase Effective Date
     and (b) the denominator of which is the Total Commitment effective as of
     such Commitment Increase Effective Date.

          "Affiliate" means, as to any Person, any other Person that, directly
     or indirectly through one or more intermediaries or otherwise, controls, is
     controlled by, or is under common control with, such Person.  As used in
     this definition, "control" means the possession, directly or indirectly, of
     the power to direct or cause the direction of the management or policies of
     a Person (whether through ownership of securities or limited liability
     company, partnership or other ownership interests, by contract or
     otherwise).  At the date of this Agreement, each of LRC and CRIC controls
     and is an Affiliate of the Borrower.
<PAGE>
 
          "Affiliate Indebtedness" means, as to any Person, Indebtedness of such
     Person which is owed to any Affiliate of such Person.

          "Agent" means The Bank of New York, in its capacity as agent for the
     Lenders pursuant to this Agreement, and any successor Agent appointed
     pursuant to Section 9.07.

          "Agent's Office" means the address of the Agent specified in or
     determined in accordance with the provisions of Section 10.01.

          "Agreement" means this Agreement, including all attached Schedules,
     Annexes and Exhibits, each as amended, modified and supplemented from time
     to time.

          "Applicable Debt Percentage Ratio" means (a) as of any Determination
     Date as defined in clause (a) of the definition thereof, the ratio of (i)
     Consolidated Indebtedness as of the end of the Borrower's most recently
     ended fiscal quarter to (ii) Consolidated EBITDA for the Borrower's four
     most recently ended fiscal quarters, and (b) as of any other Determination
     Date, 3.00 to 1.00.

          "Applicable Letter of Credit Fee Percentage" means, at any time, the
     per annum percentage equal to the Applicable Margin at such time.

          "Applicable Margin" means (a) for the period from the Closing Date
     until the first Determination Date after the Closing Date, 0.550% per
     annum, and (b) for any subsequent period from and including any
     Determination Date, beginning with the first Determination Date after the
     date of this Agreement, to the next Determination Date to occur, if the
     Applicable Debt 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 column B below (if such first day
     occurs during the Pre-Completion Period) or column C below (if such first
     day occurs during the Post-Completion Period):

<TABLE>
<CAPTION>
 
             A                  B       C
- --------------------------    ------  ------
<S>                           <C>     <C>
less than 1.00 to 1.00        0.550%  0.450%

less than 2.00 to 1.00 but
 1.00 to 1.00 or more         0.600%  0.500%

less than 3.00 to 1.00 but
 2.00 to 1.00 or more         0.650%  0.550%
 
3.00 to 1.00 or more          0.725%  0.625%
</TABLE>

                                       2
<PAGE>
 
          "Assignment Agreement" means any agreement substantially in the form
     of Exhibit 10.06(a) with respect to an assignment in accordance with
     Section 10.06.

          "Available Credit" means, at the time of any determination, an amount
     equal to (a) the Total Commitment, minus (b) the aggregate outstanding
     principal amount of Loans, minus (c) the Letter of Credit Obligations.

          "Average Consolidated Indebtedness" means, as of the date of any
     determination, without duplication of amounts, the average of the aggregate
     amounts outstanding at the end of each month during the Borrower's four
     most recently ended fiscal quarters of all obligations (other than
     obligations in respect of Interest Rate Protection Agreements) of the
     Borrower and the Subsidiaries in respect of the principal amount of all
     Indebtedness, including, without limitation, the Loans, the Term Loans, the
     Letter of Credit Obligations, all Qualified Subordinated Debt, all
     Permitted Replacement Debt and all Distribution Debt.

          "Average Debt to EBITDA Ratio" means, as of the date of any
     determination, the ratio of (a) Average Consolidated Indebtedness over the
     Borrower's four most recently ended fiscal quarters to (b) Consolidated
     EBITDA for such fiscal quarters.

          "Bankruptcy Law" means Title 11 of the United States Code or any other
     federal or state law, or any foreign law, relating to bankruptcy,
     insolvency, reorganization, relief or protection of debtors.

          "Base Rate" means, for any day, a rate per annum equal to the higher
     of (a) the Prime Rate in effect on such day and (b) the sum of 0.5%, plus
     the Federal Funds Rate in effect on such day.

          "Base Rate Loan" means any Loan that bears interest computed on the
     basis of the Base Rate.

          "Benefit Plan" means, with respect to any Person at any time, any
     "employee pension benefit plan" as defined in Section 3(2) of ERISA,
     including any plan that is covered by Title IV of ERISA or subject to the
     minimum funding standards under Section 412 of the Code (excluding any
     Multiemployer Benefit Plan), the funding requirements of which (under
     Section 302 of ERISA or Section 412 of the Code) are, or at any time within
     six years preceding the time in question were, in whole or in part, the
     responsibility of such Person or with respect to which such Person or an
     ERISA Affiliate of such Person was a "contributing sponsor" or an
     "employer" as defined in Section 4001 and Section 3(5), respectively, of
     ERISA.

          "Birmingport Facility" has the meaning assigned to such term in the
     Contribution Agreement as in effect on the date of this Agreement.

                                       3
<PAGE>
 
          "Borrower" means LYONDELL-CITGO Refining Company Ltd., a Texas limited
     liability company.

          "Borrowing" means one or more borrowings by the Borrower on the same
     day under and pursuant to this Agreement, each of which consists of Loans
     of the same Type by the Lenders.

          "Business Day" means a day of the year on which banks are not
     authorized or required to be closed in New York City and, if the applicable
     Business Day relates to any Eurodollar Rate Loans, on which dealings are
     carried on between prime banks in the London interbank market.

          "Capital Lease" means a lease of (or other agreement conveying the
     right to use) real or personal property that is required to be classified
     and accounted for as a capital lease under GAAP as in effect on the date of
     this Agreement, and, for purposes of this Agreement, the amount of any
     Capital Lease obligation at any date shall be the capitalized amount
     thereof at such date as determined in accordance with GAAP as in effect on
     the date of this Agreement.

          "Capital Security" means (a) any share, membership or other percentage
     interest, unit of participation or other equivalent (however designated) of
     a corporate equity security or other equity interest in a Person and (b)
     any debt security or other evidence of Indebtedness which is convertible
     into or exchangeable for, or any option, warrant or other right to acquire,
     any Capital Security of any type referred to in clause (a) of this
     definition.

          "Change of Control" means (a) prior to the In-Service Date, the
     failure of CITGO or Lyondell, individually or collectively, to own, legally
     and beneficially, directly or indirectly, 100% of the outstanding ownership
     and voting interests in the Borrower, and (b) after the In-Service Date,
     the failure of CITGO or Lyondell, individually or collectively, to own,
     legally and beneficially, directly or indirectly, at least 35% of the
     outstanding ownership and voting interests in the Borrower.

          "Charter Documents" means, with respect to (a) the Borrower, (i) its
     Articles of Organization and (ii) the Regulations, and (b) with respect to
     any other Person, (i) the articles or certificate of formation,
     incorporation or organization (or the equivalent organizational documents)
     of such Person, (ii) the bylaws, limited liability company agreement or
     regulations (or the equivalent governing documents) of such Person and
     (iii) each document setting forth the designation, amount and relative
     rights, limitations and preferences of any class or series of such Person's
     Capital Securities or of any rights in respect of such Person's Capital
     Securities.

          "CITGO" means CITGO Petroleum Corporation, a Delaware corporation.

                                       4
<PAGE>
 
          "Closing Date" means the date as of which this Agreement is deemed to
     have been executed and delivered by the Borrower, the Agent, each Co-Agent,
     the Issuer and each Lender named on the signature pages hereof, as set
     forth in the paragraph preceding the Borrower's signature hereon.

          "Co-Agents" means The Bank of Nova Scotia, Credit Lyonnais, The First
     National Bank of Chicago and The Industrial Bank of Japan, Ltd., in their
     respective capacities as Co-Agents for the Lenders pursuant to this
     Agreement.

          "Code" means the Internal Revenue Code of 1986.

          "Commitment" means, with respect to each Lender, the amount set forth
     opposite such Lender's name under the heading "Commitment" on Annex A or,
     in the case of a Lender that becomes a Lender pursuant to an assignment or
     a supplement, the amount set forth in the applicable Assignment Agreement
     or Supplement to Credit Agreement, as the same may be increased or reduced
     from time to time pursuant to supplements in accordance with Section
     2.01(c), pursuant to Section 2.04 or pursuant to assignments in accordance
     with Section 10.06.

          "Commitment Increase Effective Date" has the meaning specified in
     Section 2.01(c).

          "Confidential Information" has the meaning specified in Section 10.04.

          "Consolidated EBIT" means, for any period, without duplication of
     amounts, the sum of (a) Net Income for such period, plus (b)(i) such amount
     of Consolidated Interest Expense for such period as was deducted in
     determining such Net Income and (ii) the amount classified as income tax
     expense and deducted in determining such Net Income.

          "Consolidated EBITDA" means, for any period, without duplication of
     amounts, the sum of (a) Consolidated EBIT for such period, plus (b) the
     amount classified as depreciation and amortization expense and deducted in
     determining Net Income for such period.

          "Consolidated Indebtedness" means, as of the date of any
     determination, without duplication of amounts, the aggregate amount of all
     obligations (other than obligations in respect of Interest Rate Protection
     Agreements) of the Borrower and the Subsidiaries in respect of the
     principal amount of all Indebtedness, including, without limitation, the
     Loans, the Term Loans, the Letter of Credit Obligations, all Qualified
     Subordinated Debt, all Permitted Replacement Debt and all Distribution Debt
     as of such date.

                                       5
<PAGE>
 
          "Consolidated Interest Expense" means, for any period, without
     duplication of amounts, the sum of (a) the amount classified as interest
     costs and deducted in determining Net Income for such period, plus (b) the
     interest costs of the Borrower and the Subsidiaries on a consolidated basis
     and capitalized in accordance with GAAP for such period and not deducted in
     determining Net Income for such period.

          "Consolidated Net Worth" means, as of the date of any determination,
     without duplication of amounts, (i) the aggregate amount of total assets of
     the Borrower and the Subsidiaries, minus (ii) the aggregate amount of the
     total liabilities of the Borrower and the Subsidiaries, in each case as of
     the end of the Borrower's most recently ended fiscal quarter and determined
     on a consolidated basis in accordance with GAAP as in effect on the date of
     this Agreement and as applied on a basis consistent with the basis on which
     GAAP was applied in the preparation of the Initial Financial Statements.
     Without limiting the generality of the foregoing, the liabilities of the
     Borrower at any time shall include the amount of all Distribution Debt and
     accrued, unpaid interest thereon at such time.

          "Contribution Agreement" means the Contribution Agreement, dated July
     1, 1993, between Lyondell and the Borrower, as amended, modified and
     supplemented from time to time to the extent permitted by Section 7.17,
     unless the context otherwise requires.

          "Convert," "Conversion" or "Converted" each refers to a conversion of
     Loans of one Type into Loans of another Type and includes the continuation
     of Eurodollar Rate Loans as Eurodollar Rate Loans having a new Interest
     Period.

          "Coverage Ratio" means, as of the date of any determination, the ratio
     of (a) Consolidated EBIT for the Borrower's four most recently ended fiscal
     quarters to (b) Consolidated Interest Expense for such fiscal quarters.

          "CRIC" means Citgo Refining Investment Company, an Oklahoma
     corporation.

          "Crude Supply Agreement" means the Crude Supply Agreement, dated as of
     May 5, 1993, between the Borrower and Lagoven, S.A., a corporation
     organized under the laws of the Republic of Venezuela, as amended, modified
     and supplemented from time to time to the extent permitted by Section 7.17,
     unless the context otherwise requires.

          "Current Date" means any day during the 20-day period ending on the
     Closing Date.

          "Custodian" means any custodian, receiver, sequestrator, trustee or
     similar official (a) under any Bankruptcy Law, (b) under any business
     corporation statute in 

                                       6
<PAGE>

     the case of assets of any corporation or (c) under or pursuant to any
     limited liability company statute in the case of assets of any limited
     liability company.

          "Debt to Total Capitalization Ratio" means, as of the end of any
     fiscal quarter of the Borrower, the ratio of (a) Consolidated Indebtedness
     to (b) the sum of (i) Consolidated Net Worth, plus (ii) Consolidated
     Indebtedness, in each case as of such time.

          "Default" means any condition or event that constitutes an Event of
     Default or that with the giving of notice or lapse of time or both would
     become an Event of Default.

          "Default Rate" means the rate otherwise applicable under Section
     2.06(a)(i) or (ii), plus 2.0% or, if there is no such applicable rate in
     respect of the circumstances for which the Default Rate is used, the Base
     Rate, plus 2.0%.

          "Determination Date" means, for purposes of determining the Applicable
     Margin from time to time, (a) the first date after the end of a fiscal
     quarter of the Borrower on which the Agent receives the Financial
     Statements as of the end of such fiscal quarter and the related compliance
     certificate required by Section 6.01(a) or 6.01(b), as the case may be, to
     be delivered to the Agent by reason of such fiscal quarter having ended,
     (b) the 60th day after the end of any fiscal quarter of the Borrower if the
     Agent has not theretofore received the Financial Statements and the related
     compliance certificate required to be furnished to the Agent by Section
     6.01(a) by reason of such fiscal quarter having ended and (c) the 120th day
     after the end of any last fiscal quarter of any fiscal year of the Borrower
     if the Agent has not theretofore received the Financial Statements and the
     related audit report and compliance certificate required by Section 6.01(b)
     to be furnished to the Agent by reason of such fiscal quarter having ended.

          "Distribution Debt" means obligations of the Borrower created under
     Section 7.3.(C) of the Regulations to any Owner in respect of distributions
     required to be made pursuant to Section 7.4 or 7.5 of the Regulations
     (other than an amount described in Section 7.4.(B) of the Regulations).

          "Dollars" and the sign "$" each means lawful money of the United
     States of America.

          "Domestic Lending Office" means, with respect to each Lender, (a) the
     branch or office of such Lender set forth below such Lender's name under
     the heading "Domestic Lending Office" on Annex A or, in the case of a
     Lender that becomes a Lender pursuant to an assignment or a supplement, the
     branch or office of such Lender set forth under the heading "Domestic
     Lending Office" in the Assignment Agreement or the Supplement to Credit
     Agreement giving effect to such assignment 

                                       7
<PAGE>
 
     or supplement, or (b) such other branch or office of such Lender designated
     by such Lender to the Agent and the Borrower from time to time as the
     branch or office at which its Base Rate Loans are to be made or maintained.

          "Eligible Assignee" means at any time any Lender, bank, finance
     company, insurance company, savings and loan association, savings bank,
     other financial institution or fund that (a) is regularly engaged in making
     or purchasing loans or (b) if not regularly engaged in making commercial
     loans, is a "qualified institutional buyer" or an "accredited investor" (as
     defined in Rule 144A and Regulation D, respectively, under the Securities
     Act of 1933).

          "Environmental Laws" means any and all Governmental Requirements
     relating to the environment, including, without limitation, ambient air,
     surface water, land surface or subsurface strata, or to emissions,
     discharges, releases or threatened releases of pollutants, contaminants,
     chemicals or industrial, toxic or hazardous substances or wastes or noxious
     noise or odor into the environment, or otherwise relating to the
     manufacture, processing, distribution, use, treatment, storage, disposal,
     transport or handling of pollutants, contaminants, chemicals or industrial,
     toxic or hazardous substances or wastes (including, without limitation,
     petroleum, petroleum distillates, asbestos or asbestos-containing material
     or polychlorinated biphenyls).

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

          "ERISA Affiliate" means, with respect to any Person, any other Person,
     including an Affiliate of such first Person, that is a member or at any
     time within six years of the time in question has been a member of any
     group of organizations within the meaning of Section 414(b), (c), (m) or
     (o) of the Code of which such first Person is or was a member.

          "Eurocurrency Liabilities" has the meaning specified in Regulation D
     of the Board of Governors of the Federal Reserve System.

          "Eurodollar Lending Office" means, with respect to each Lender, (a)
     the branch or office of such Lender set forth below such Lender's name
     under the heading "Eurodollar Lending Office" on Annex A or, in the case of
     a Lender that becomes a Lender pursuant to an assignment or a supplement,
     the branch or office of such Lender set forth under the heading "Eurodollar
     Lending Office" in the Assignment Agreement or the Supplement to Credit
     Agreement giving effect to such assignment or supplement, or (b) such other
     branch or office of such Lender designated by such Lender to the Agent and
     the Borrower from time to time as the branch or office at which its
     Eurodollar Rate Loans are to be made or maintained.

          "Eurodollar Rate" means, for any Interest Period for each Eurodollar
     Rate Loan comprising part of the same Borrowing, the per annum rate
     determined by the 

                                       8
<PAGE>
 
     Agent as follows: (a) the Agent shall obtain the rate for
     deposits in Dollars for a period comparable to such Interest Period which
     appears on the Telerate Page 3750 as of 11:00 A.M. (London time) two
     Business Days preceding the first day of such Interest Period; and (b) if
     the Agent is not able to obtain quotations for the determination of the
     Eurodollar Rate pursuant to clause (a) above, the Eurodollar Rate shall be
     the per annum rate of interest quoted by the Agent at which Dollar deposits
     are offered by the Agent to prime banks in the London interbank market at
     approximately 11:00 A.M. (London time) two Business Days prior to the first
     day of such Interest Period, which deposits are for a period equal to such
     Interest Period and in an amount substantially equal to the Eurodollar Rate
     Loan that the Agent would make in its capacity as a Lender.

          "Eurodollar Rate Loan" means any Loan that bears interest computed on
     the basis of the Adjusted Eurodollar Rate.

          "Eurodollar Rate Reserve Percentage" means, for any day in an Interest
     Period for any Eurodollar Rate Loan, the reserve percentage applicable on
     that day under regulations issued from time to time by the Board of
     Governors of the Federal Reserve System (or any successor) for determining
     the maximum reserve requirement (including, without limitation, any
     emergency, supplemental or other marginal reserve requirement) for the
     Agent with respect to liabilities or assets consisting of or including
     Eurocurrency Liabilities having a term equal to such Interest Period.

          "Event of Default" has the meaning specified in Section 8.01.

          "Existing Credit Agreement" means the Credit Agreement, dated as of
     July 1, 1994, among the Borrower, the lenders that are parties thereto and
     Continental Bank N.A.

          "Extension Date" has the meaning specified in Section 2.01(b)(i).

          "Extension Effective Date" has the meaning specified in Section
     2.01(b)(i).

          "Extension Request" has the meaning specified in Section 2.01(b)(i).

          "Federal Funds Rate" means, for each day, the rate per annum (rounded
     upwards if necessary, to the nearest 1/100th of 1%) 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, as
     published for such day (or, if such day is not a Business Day, for the next
     preceding Business Day) by the Federal Reserve Bank of New York or, if such
     rate is not so published for any day that is a Business Day, the average of
     the quotations for such day received by the Agent from three federal funds
     brokers of recognized standing selected by it.

                                       9
<PAGE>
 
          "Fee Letters" means (a) that certain letter from the Agent to the
     Borrower dated as of the date of this Agreement respecting commitment fees
     payable by the Borrower on the Closing Date to the Agent for the respective
     accounts of the Lenders and (b) that certain letter from The Bank of New
     York to the Borrower dated as of the date of this Agreement respecting
     certain fees payable by the Borrower to The Bank of New York on the Closing
     Date and from time to time in connection with this Agreement.

          "Financial Statements" means the Initial Financial Statements and the
     financial statements of the Borrower and the Subsidiaries required to be
     delivered to the Agent by Sections 6.01(a) and (b).

          "GAAP" means generally accepted accounting principles and practices in
     the United States as in effect from time to time and concurred in by the
     independent certified public accountants certifying the Financial
     Statements required by Section 6.01(b), applied on a basis consistent
     (except for changes concurred in by such independent certified public
     accountants) with the most recent audited Financial Statements delivered to
     the Agent, except as otherwise specifically provided herein.

          "Governmental Approval" means any authorization, consent, approval,
     permit, franchise, certificate, license, implementing order or exemption
     of, or registration or filing with, any Governmental Authority.

          "Governmental Authority" means (a) any national, state, county,
     municipal or other government, domestic or foreign, or any agency, board,
     bureau, commission, court, department or other instrumentality of any such
     government or (b) any school district having the authority to assess and
     collect Taxes.

          "Governmental Requirement" means any law, statute, code, ordinance,
     order, rule, regulation, judgment, decree, injunction, writ, edict, award,
     authorization or other requirement of any Governmental Authority or any
     obligation included in any certificate, franchise, permit or license issued
     by any Governmental Authority or resulting from binding arbitration,
     including, without limitation, any requirement under common law.

          "Gross Proceeds" means, with respect to any Permitted Replacement
     Debt, (a) if such Permitted Replacement Debt is incurred by the Borrower in
     a commercial or other loan transaction or to an Affiliate of the Borrower,
     the aggregate unpaid principal amount of such Permitted Replacement Debt
     when it is so incurred, or (b) if such Permitted Replacement Debt is
     evidenced by "securities" (as defined in the Securities Act of 1933) issued
     and sold by the Borrower to one or more underwriters for resale or one or
     more investors for investment, the aggregate gross proceeds received by the
     Borrower from such sale before the deduction of any expenses related to
     such sale, provided, that in the case of any sale to an underwriter for

                                       10
<PAGE>
 
     resale, if such underwriter's underwriting or similar discount or
     commission is not reflected as a reduction in the purchase price paid by
     such underwriter to the Borrower for such Permitted Replacement Debt from
     the price at which such underwriter initially offers such Permitted
     Replacement Debt for resale, it shall be deducted, without duplication of
     amounts, in determining the Gross Proceeds received by the Borrower from
     such Permitted Replacement Debt.

          "Guaranty" means, for any Person, without duplication, any liability,
     contingent or otherwise, of such Person guaranteeing or otherwise becoming
     liable for any obligation of any other Person (the "primary obligor") in
     any manner, whether directly or indirectly, and including, without
     limitation, any liability of such Person, direct or indirect, (a) to
     purchase or pay (or advance or supply funds for the purchase or payment of)
     such obligation or to purchase (or to advance or supply funds for the
     purchase of) any security for the payment of such obligation, (b) to
     purchase property, securities or services for the purpose of assuring the
     owner of such obligation of the payment of such obligation or (c) to
     maintain working capital, equity capital or other financial statement
     condition or liquidity of the primary obligor so as to enable the primary
     obligor to pay such obligation; provided, that the term "Guaranty" does not
     include endorsements for collection or deposit in the ordinary course of
     the endorser's business.

          "Houston Facility" has the meaning assigned to such term in the
     Contribution Agreement as in effect on the date of this Agreement.

          "Increasing Lender" has the meaning specified in Section 2.01(c).
 
          "Indebtedness" of any Person means, without duplication, (a) any
     liability of such Person (i) for borrowed money or arising out of any
     extension of credit to or for the account of such Person (including,
     without limitation, reimbursement or payment obligations with respect to
     surety bonds, letters of credit, banker's acceptances and similar
     instruments), for the deferred purchase price of property or services or
     arising under conditional sale or other title retention agreements, other
     than trade payables arising in the ordinary course of business, (ii)
     evidenced by notes, bonds, debentures or similar instruments, (iii) in
     respect of Capital Leases or (iv) in respect of Interest Rate Protection
     Agreements, (b) any liability secured by any Lien upon any property or
     assets of such Person (or upon any revenues, income or profits of such
     Person therefrom), whether or not such Person has assumed such liability or
     otherwise become liable for the payment thereof, (c) any liability of
     others of the type described in the preceding clause (a) or (b) in respect
     of which such Person has incurred, assumed or acquired a liability by means
     of a Guaranty or (d) with respect to the Borrower, Distribution Debt.

          "Indemnified Person" means, at any time, any Person that is, or at
     such time was, the Agent, a Co-Agent, the Issuer, a Lender, an Affiliate of
     the Agent, a 

                                       11
<PAGE>
 
     Co-Agent, the Issuer or a Lender or a director, officer,
     employee or agent of any such Person.

          "Information" means written information, including, without
     limitation, data, certificates, reports, statements (excluding Financial
     Statements) and documents.

          "Initial Financial Statements" means the audited balance sheet of the
     Borrower as at December 31, 1994 and the related statements of income and
     cash flows for the Borrower's fiscal year ended on such date, copies of
     which have been made available to each Lender identified on the signature
     pages hereof prior to the date of this Agreement.

          "In-Service Date" means the close of business on the last day of the
     calendar month in which the earliest of the following occurs: (a) both
     Mechanical Completion and Specified Production Capability have been
     achieved; (b) the date on which the Owners determine by Owners Committee
     Action either that Specified Production Capability cannot, under any
     circumstances, be achieved or that additional modifications will not
     be attempted to achieve Specified Production Capability; or (c) the date
     that is 120 days after Mechanical Completion has been achieved.

          "Intellectual Property" means (a) patents and patent rights, (b)
     trademarks, trademark rights, trade names, trade name rights, corporate
     names, business names, trade styles, service marks and logos and (c)
     copyrights, in each case whether registered, unregistered or under pending
     registration under the laws of the United States or any other country.

          "Interest Payment Date" means the last day of March, June, September
     and December of each year.

          "Interest Period" means, for each Eurodollar Rate Loan, the period (a)
     commencing (i) for each such Loan comprising part of the same Borrowing, on
     the date such Loan is made, and (ii) for each such Loan into which any Loan
     has been Converted, the date of that Conversion, and (b) ending on the last
     day of the period selected by the Borrower pursuant to the provisions
     below.  In the case of all Loans, the duration of each Interest Period
     shall be seven days or one, two, three or six months, and in each case as
     the Borrower may, upon notice received by the Agent not later than 12:00
     Noon (New York City time) on the third Business day prior to the first day
     of such Interest Period, select; provided, however, that: (a) Interest
     Periods commencing on the same date for Loans comprising part of the same
     Borrowing shall be of the same duration; (b) whenever the last day of any
     Interest Period would otherwise occur on a day other than a Business Day,
     the last day of such Interest Period shall be extended to occur on the next
     succeeding Business Day, provided, that if such extension would cause the
     last day of such Interest Period to occur in the next succeeding calendar
     month, the last day of such Interest Period

                                       12
<PAGE>
 
     shall occur on the next preceding Business Day; and (c) no more than ten
     Interest Periods may be outstanding at any time.

          "Interest Rate Protection Agreement" means, for any Person, an
     interest rate swap, cap or collar agreement or similar arrangement
     providing for the transfer or mitigation of interest risks of such Person
     either generally or under specific contingencies between such Person and
     any other Person.

          "Invited Lender" has the meaning specified in Section 2.01(b)(i).

          "Issuance Expenses" means, with respect to any Permitted Replacement
     Debt, without duplication of amounts, the expenses incurred by the Borrower
     in connection with its issuance or sale of such Permitted Replacement Debt
     which would be capitalized and classified as debt issuance costs on a
     balance sheet of the Borrower prepared in accordance with GAAP as in effect
     on the date of this Agreement; provided, however, that "Issuance Expenses"
     do not include (a) any amount paid or payable by the Borrower to any
     Affiliate of the Borrower (other than, if the Affiliate retains a law firm
     as its counsel in connection with such issuance or sale, the reasonable
     fees and disbursements of such firm in that connection), (b) any
     underwriting or other similar discount or commission or (c) any unamortized
     debt discount.

          "Issuer" means The Bank of New York, in its capacity as the issuer of
     each Letter of Credit, and any successor Issuer appointed pursuant to
     Section 2.03(l).

          "Issuer's Office" means the address of the Issuer specified in or
     determined in accordance with Section 10.01.

          "LC Available Amount" means, at the time of any determination in
     connection with a Letter of Credit, the amount equal to (a) the aggregate
     amount of Commitments of those Lenders whose respective Termination Dates
     end at least one Business Day after the proposed expiry date of such Letter
     of Credit, minus (b) the aggregate outstanding principal amount of Loans at
     such time, minus (c) the Letter of Credit Obligations at such time.

          "Lender" means at any time any Person then having any or all of the
     rights or obligations of a Lender and which (a) is identified as a Lender
     on the signature pages hereof, (b) has been assigned such rights or
     obligations pursuant to an Assignment Agreement or (c) has become a Lender
     pursuant to a Supplement to Credit Agreement.

          "Lending Office" means, with respect to each Lender, such Lender's
     Domestic Lending Office in the case of Base Rate Loans or such Lender's
     Eurodollar Lending Office in the case of Eurodollar Rate Loans.

                                       13
<PAGE>
 
          "Letter of Credit" means a standby letter of credit or commercial
     letter of credit issued by the Issuer for the account of the Borrower
     pursuant to Section 2.03.

          "Letter of Credit Obligations" means, at the time of any
     determination, the sum of (a) the Reimbursement Obligations, plus (b) the
     Letter of Credit Undrawn Amounts.

          "Letter of Credit Reimbursement Agreements" means (a) the Standing
     Agreement for Commercial Letters of Credit in the form of Exhibit 2.03(c)-1
     and (b) the Standing Agreement for Standby Letters of Credit in the form of
     Exhibit 2.03(c)-2.

          "Letter of Credit Request" has the meaning specified in Section
     2.03(d).

          "Letter of Credit Undrawn Amount" means, at the time of any
     determination, the aggregate amount available for drawing under all
     outstanding Letters of Credit.

          "Lien" means, with respect to any property or asset of any Person (or
     any revenues, income or profits of such Person therefrom) (in each case
     whether the same is consensual or nonconsensual or arises by contract,
     operation of law, legal process or otherwise), (a) any mortgage, lien,
     security interest, pledge, attachment, levy or other charge or encumbrance
     of any kind thereupon or in respect thereof or (b) any other arrangement
     under which the same is transferred, sequestered or otherwise identified
     with the intention of subjecting the same to, or making the same available
     for, the payment or performance of any liability in priority to the payment
     of the ordinary, unsecured creditors of such Person. For purposes of this
     Agreement, a Person shall be deemed to own subject to a Lien any asset that
     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.

          "Litigation" means any case, proceeding, claim, grievance, lawsuit or
     investigation conducted by or pending before any Governmental Authority or
     any arbitration proceeding.

          "Loan" means a loan by a Lender to the Borrower pursuant to Section
     2.01.

          "Loan Document Claim" means any claim in connection with, arising out
     of or relating to any Loan Document or any transaction with any Lender, the
     Issuer, any Co-Agent or the Agent contemplated thereby, whether direct or
     indirect, whether based on any federal, state or local law or regulation,
     securities or commercial law or regulation, under common law or in equity,
     or on contract, tort or otherwise, regardless of whether the transactions
     contemplated hereby are ever consummated and regardless of when any such
     claim arises.

                                       14
<PAGE>
 
          "Loan Documents" means this Agreement, the Notes, the Letter of Credit
     Reimbursement Agreements, the Fee Letters and all other agreements between
     the Borrower or any Subsidiary and any one or more of the Lenders, the
     Issuer, the Co-Agents and the Agent respecting fees payable in connection
     with this Agreement or any other Loan Document and all other written
     agreements, documents, instruments and certificates now or hereafter
     executed or delivered by the Borrower or any Subsidiary to or for the
     benefit of the Agent, any Co-Agent, the Issuer or any Lender pursuant to or
     in connection with any of the foregoing, and any and all amendments,
     modifications, supplements, renewals, extensions, increases, restatements,
     rearrangements or substitutions from time to time of all or any part of the
     foregoing.

          "LRC" means Lyondell Refining Company, a Delaware corporation.

          "Lyondell" means Lyondell Petrochemical Company, a Delaware
     corporation.

          "Lyondell Obligations" means the obligations of Lyondell to the
     Borrower on the date of this Agreement under Section 5.2.(A) of the
     Contribution Agreement with respect to "Pre-Closing Environmental
     Liabilities and Costs" that are included in "Retained Liabilities" as
     provided in Section 2.3.(D) of the Contribution Agreement and not excluded
     from "Retained Liabilities" by Schedule 2.3.(D) to the Contribution
     Agreement.  As used in this definition, "Contribution Agreement" means the
     Contribution Agreement as in effect on the date of this Agreement, and the
     quoted terms in this definition have the meanings ascribed to them in the
     Contribution Agreement as in effect on the date of this Agreement.

          "Material" means material to the business, operations, property or
     assets, liabilities, financial condition or results of operations of the
     Borrower and the Subsidiaries considered as a whole.

          "Material Adverse Effect" means, relative to the occurrence or non-
     occurrence of any event and after taking into account existing or
     reasonably anticipated insurance coverage and indemnification rights with
     respect to such occurrence or non-occurrence, (a) a material adverse effect
     on the business, operations, property or assets, liabilities, condition
     (financial or otherwise) or results of operations of the Borrower and the
     Subsidiaries considered as a whole or (b) a material adverse effect on the
     ability of the Borrower to perform its payment or other obligations under
     the Loan Documents.

                                       15
<PAGE>

          "Material Agreement" means any contract or agreement to which the
     Borrower or any Subsidiary is a party or by which the Borrower or any
     Subsidiary is bound or to which any property or assets of the Borrower or
     any Subsidiary is subject and which is Material. Without limiting the
     generality of the foregoing, for purposes of this Agreement, the Supply or
     Purchase Contracts and the Contribution Agreement constitute Material
     Agreements.

          "Mechanical Completion" means completion in its entirety of the
     physical construction of the Refinery Expansion Project as described in the
     Recommended Design.

          "Moody's" means Moody's Investors Service, Inc.

          "Multiemployer Benefit Plan" means a "multiemployer plan" as defined
     in Section 4001(a)(3) of ERISA, Section 414 of the Code or Section 3(37) of
     ERISA (or any similar type of plan established or regulated under the laws
     of any foreign country) to which the Borrower or any ERISA Affiliate of the
     Borrower is making or accruing or has made or accrued an obligation to make
     contributions within six years of the time in question.

          "Multiple Employer Plan" means any "employee benefit plan" as defined
     in Section 3(3) of ERISA, other than a Multiemployer Benefit Plan, that is
     subject to Title IV of ERISA and to which the Borrower or any ERISA
     Affiliate of the Borrower and an employer other than the Borrower or any
     ERISA Affiliate of the Borrower contribute or have an obligation to
     contribute.

          "Net Income" means, for any period, the aggregate net income (or net
     loss) of the Borrower and the Subsidiaries for such period determined on a
     consolidated basis in accordance with GAAP as in effect on the date of this
     Agreement and as applied on a basis consistent with the basis on which GAAP
     was applied in the preparation of the Initial Financial Statements.

          "Net Proceeds" means, with respect to any Permitted Replacement Debt,
     (a) the Gross Proceeds of such Permitted Replacement Debt, minus (b) the
     Issuance Expenses paid or payable by the Borrower in connection with the
     issuance or sale of such Permitted Replacement Debt.

          "New Funds Amount" means, as of any Commitment Increase Effective
     Date, (a) for each then New Lender, the amount equal to the product of (i)
     the Adjustment Percentage as of such Commitment Increase Effective Date
     multiplied by (ii) such New Lender's Commitment effective as of such
     Commitment Increase Effective Date, and (b) for each then Increasing
     Lender, the amount by which (i) the product of (A) such Adjustment
     Percentage multiplied by (B) such Increasing Lender's Commitment effective
     as of such Commitment Increase Effective Date 

                                       16
<PAGE>
 
     exceeds (ii) the aggregate unpaid principal amount of such Increasing
     Lender's Loans immediately prior to such Commitment Increase Effective
     Date.

          "New Lender" has the meaning specified in Section 2.01(c).

          "Non-extending Lender" means, if the Borrower has made an Extension
     Request pursuant to Section 2.01(b)(i) and the Termination Date subject to
     that Extension Request will be extended pursuant to Section 2.01(b)(ii),
     any Invited Lender receiving that Extension Request which has rejected, or
     is deemed pursuant to Section 2.01(b)(ii) to have rejected, that Extension
     Request.

          "Note" means a promissory note of the Borrower in the form of Exhibit
     A.

          "Notice of Borrowing" has the meaning specified in Section 2.02(a).

          "Notice of Conversion" has the meaning specified in Section 2.07.

          "Notice of Commitment Increase" has the meaning specified in Section
     2.01(c).

          "Obligations" means all obligations or liabilities of any form or
     nature, whether matured or unmatured, fixed or contingent, of the Borrower
     to the Agent, any Co-Agent, the Issuer or any Lender in connection with,
     arising under or related to any Loan Document or any Permitted Interest
     Rate Protection Agreement between the Borrower and any Lender.

          "Outside Representatives" means, with respect to any Person, the
     Representatives of such Person other than its own directors, officers,
     employees and Affiliates.

          "Owners" means LRC and CRIC and any of their respective successors and
     assigns under the Regulations.

          "Owners Committee" means the committee of representatives of the
     Owners through which the Owners manage the Borrower in accordance with the
     Regulations.

          "Owners Committee Action" has the meaning specified in Section 3.6.(A)
     of the Regulations.

          "PBGC" means the Pension Benefit Guaranty Corporation.

          "Permitted Interest Rate Protection Agreement" means an Interest Rate
     Protection Agreement between the Borrower and a Lender or other financial
     institution having combined capital and surplus of at least $500,000,000 or
     that has (or that is a subsidiary of a bank holding company that has)
     publicly traded

                                       17
<PAGE>
 
     unsecured long-term debt securities given a rating of A-
     (or the equivalent rating then in effect) or better by S&P or a rating of
     A3 (or the equivalent rating then in effect) or better by Moody's.

          "Permitted Investments" means (a) at the time of purchase or other
     acquisition by the Borrower or any Subsidiary, (i) obligations issued or
     guaranteed by the United States of America with a remaining maturity not
     exceeding one year, (ii) commercial paper with maturities of not more than
     270 days and a published rating of not less than A-1 (or the equivalent
     rating then in effect) by S&P or P-1 (or the equivalent rating then in
     effect) by Moody's, (iii) certificates of deposit and bankers' acceptances
     having maturities of not more than one year of any Lender or any commercial
     bank or trust company if (A) such bank or trust company has a combined
     capital and surplus of at least $500,000,000 and (B) its unsecured long-
     term debt obligations, or those of a holding company of which it is a
     subsidiary, are rated not less than A- (or the equivalent rating then in
     effect) by S&P or A3 (or the equivalent rating then in effect) by Moody's,
     (b) Capital Securities of, or loans or advances to, any Wholly-Owned
     Subsidiary, provided, that if any Person that is a Wholly-Owned Subsidiary
     ceases at any time to be a Wholly-Owned Subsidiary, Capital Securities of
     that Person remaining owned by the Borrower or any Subsidiary, and any
     loans or advances to that Person by the Borrower or any Subsidiary
     remaining outstanding, will cease being Permitted Investments at that time
     and will be deemed acquired or made at that time for purposes of Section
     7.13, (c) advances made by the Borrower to the Owners pursuant to and in
     accordance with Section 7.6 of the Regulations so long as no Event of
     Default exists or would exist after giving effect thereto, provided, that
     if any such advance is not repaid in the manner required by Section 7.6 of
     the Regulations within 90 days of the date of such advance, such advance
     will cease being a Permitted Investment at the close of business on such
     90th day and will be deemed made at that time for purposes of Section 7.13,
     and (d) the promissory note in the form set forth in Exhibit 6.6.(E) to the
     Regulations as in effect on the date hereof, if any, delivered by CRIC to
     the Borrower pursuant to and in accordance with Section 6.6.(E) of the
     Regulations.

          "Permitted Liens" means, as applied to the property or assets of any
     Person (or any revenues, income or profits of such Person therefrom): (a)
     Liens for Taxes if the same are not at the time due and delinquent or (if
     foreclosure, distraint, sale or other similar proceedings have not been
     commenced or, if commenced, have been stayed) are being contested in good
     faith and by appropriate proceedings, and if such Person has set aside on
     its books such reserves (segregated to the extent required by sound
     accounting practices) as may be required by GAAP; (b) Liens of carriers,
     warehousemen, mechanics, laborers and materialmen for sums not yet due or
     (if foreclosure, distraint, sale or other similar proceedings have not been
     commenced or, if commenced, have been stayed) being contested in good faith
     and by appropriate proceedings, if such Person has set aside on its books
     such reserves (segregated to the extent required by sound accounting
     practices) as may be required

                                       18
<PAGE>
 
     by GAAP; (c) Liens incurred in the ordinary course of such Person's
     business in connection with workmen's compensation, unemployment insurance
     and other social security legislation (other than pursuant to ERISA or
     Section 412(n) of the Code); (d) Liens incurred in the ordinary course of
     such Person's business in connection with deposit accounts or to secure the
     performance of bids, tenders, trade contracts, statutory obligations,
     surety and appeal bonds, performance and return-of-money bonds and other
     obligations of like nature; (e) easements, rights-of-way, reservations,
     restrictions and other similar encumbrances incurred in the ordinary course
     of such Person's business or existing on property and not materially
     interfering with the ordinary conduct of such Person's business; (f)
     defects or irregularities in such Person's title to its real properties
     which do not materially interfere with the ordinary course of such Person's
     business (provided that, in the case of the Houston Facility and the
     Birmingport Facility, such defects or irregularities also do not materially
     diminish the value, from the value as of the date of this Agreement, of the
     surface estate (the defects or irregularities as of the date of this
     Agreement with respect to the Houston Facility being set forth in the
     Commitment for Title Insurance issued by Commonwealth Land Title Company of
     Houston, as agent for Commonwealth Land Title Insurance Company, under GF
     No. 9210852, dated effective as of April 7, 1995, and with respect to the
     Birmingport Facility being set forth in the Commitment for Title Insurance
     issued by Alabama Title Co., Inc., as agent for Commonwealth Land Title
     Insurance Company, under File No. 2571-FF, dated effective as of March 21,
     1995)); (g) legal or equitable encumbrances deemed to exist by reason of
     negative pledges such as Section 7.05; (h) any interest or title of a
     lessor of assets being leased by any Person pursuant to any Capital Lease
     permitted by Section 7.09(f) or any lease that, pursuant to GAAP, would be
     accounted for as an operating lease; (i) Liens securing purchase money
     Indebtedness permitted by Section 7.09(f) so long as such Liens do not
     attach to any property or assets other than the properties or assets
     purchased with the proceeds of such Indebtedness; and (j) other Liens
     (other than pursuant to ERISA or Section 412(n) of the Code), provided that
     the obligations secured thereby do not exceed in the aggregate $1,000,000
     at any time outstanding.

          "Permitted Replacement Debt" means Indebtedness of the Borrower (a)
     that is evidenced by notes, bonds, debentures or similar instruments issued
     or sold by the Borrower for cash, (b) that is not secured, directly or
     indirectly, by any Lien upon any property or assets of the Borrower or any
     Subsidiary (or any revenues, income or profits of the Borrower or any
     Subsidiary therefrom) and (c) the Gross Proceeds from the issuance or sale
     of which are used by the Borrower until such time as all Term Loans and all
     Term Loan Obligations that have become due have been paid in full and the
     Borrower has no right to borrow any additional amount under the Term Credit
     Agreement solely (i) to prepay any then outstanding Term Loans, (ii) to pay
     the Issuance Expenses, if any, incurred by the Borrower in connection with
     such issuance or sale and (iii) to pay, if all Term Loans have been paid in
     full, such other Term Loan Obligations as have then become due.

                                       19
<PAGE>
 
          "Person" means any individual, sole proprietorship, corporation,
     partnership, limited liability company, business trust, unincorporated
     organization, mutual company, joint stock company, estate, trust, union,
     employee organization or Governmental Authority or, for the purpose of the
     definition of "ERISA Affiliate," any trade or business.

          "Post-Completion Period" means the period (a) beginning on the first
     date on which (i) both Mechanical Completion and Specified Production
     Capability have been achieved and (ii) the Borrower has delivered to the
     Agent (A) a report in form reasonably satisfactory to the Agent from an
     independent engineer selected by the Borrower and reasonably acceptable to
     the Agent to the effect, and (B) a certificate in form reasonably
     satisfactory to the Agent of a Responsible Officer representing and
     warranting to the effect, that both Mechanical Completion and Specified
     Production Capability have been achieved and (b) ending on the date on
     which all Obligations have been paid in full and no Lender has any further
     obligation to make any Loan hereunder.

          "Pre-Completion Period" means the period beginning as of the date of
     this Agreement and ending immediately prior to the beginning of the Post-
     Completion Period.

          "Prime Rate" means the fluctuating prime commercial lending rate of
     The Bank of New York, as publicly announced to be in effect from time to
     time.  The Prime Rate shall be adjusted automatically, without notice, on
     the effective date of any change in such prime commercial lending rate.
     The Prime Rate is not necessarily the lowest rate of interest of The Bank
     of New York.

          "Prohibited Transaction" means any transaction that is prohibited
     under Section 4975 of the Code or Section 406 of ERISA and not exempt under
     Section 4975 of the Code or Section 408 of ERISA, provided that, with
     respect to any transactions involving a Loan or a Letter of Credit, the
     ERISA Assumptions set forth on Schedule B are deemed to be true.

          "Prospective Assignees" means all Eligible Assignees that are
     prospective assignees of any Lender.

          "Prospective Participants" means all Eligible Assignees that are
     prospective participants of any Lender.

          "Qualified Subordinated Debt" means any Indebtedness of the Borrower
     (a)(i) to CRIC or LRC, or any Affiliate of either CRIC or LRC, having, at
     the option of the Borrower, (A) subordination terms substantially identical
     to those set forth in Exhibit 6.4.(D) to the Regulations as in effect on
     the date of this Agreement or (B) such other terms of subordination as are
     satisfactory to the Required Lenders or 

                                       20
<PAGE>
 
     (ii) to any other Person, having subordination terms reasonably
     satisfactory to the Required Lenders and (b) unless and until the Term
     Loans have been paid in full (or are paid in full with the proceeds
     thereof) and the Borrower has no right to borrow any additional amount
     under the Term Credit Agreement, which does not by its terms, or by the
     terms of any agreement or contract under or pursuant to which it is issued
     or by which it is governed, provide for any of the following to occur prior
     to the first anniversary of the Term Loan Termination Date: (i) a scheduled
     payment of any portion of the principal amount or accreted value of any
     such Indebtedness, (ii) a mandatory prepayment, redemption or repurchase of
     any portion of the principal amount or accreted value of any such
     Indebtedness (in the absence of an acceleration of the entire principal
     amount or accreted value of such Indebtedness by the holders thereof or
     their representative by reason of the occurrence, or the occurrence and
     continuation, of a default or an event of default with respect thereto) or
     (iii) the irrevocable deposit, segregation or setting aside of any funds or
     assets by the Borrower; provided, however, that any outstanding Qualified
     Subordinated Debt that is Affiliate Indebtedness of the Borrower shall
     cease to be Qualified Subordinated Debt in the event that (i) such
     Affiliate Indebtedness is, in the good faith judgment of the Required
     Lenders, more favorably subordinated to holders of Indebtedness pari passu
     with the Obligations than such Affiliate Indebtedness is subordinated to
     the Obligations and (ii) the Borrower does not concurrently therewith cause
     to be effected either an amendment of such Affiliate Indebtedness, or a
     legally, valid, binding and enforceable agreement relating thereto, whereby
     such Affiliate Indebtedness is subordinated to the Obligations on terms
     substantially identical to the terms on which it is subordinated to such
     pari passu Indebtedness.

          "Ratable Portion" means, as of the date of any determination, for each
     Lender, the fraction, expressed as a percentage, the numerator of which is
     such Lender's Commitment and the denominator of which is the Total
     Commitment.

          "Receiving Party" means the Agent, any Co-Agent, the Issuer or any
     Lender.

          "Recommended Design" means the design for the Refinery Expansion
     Project heretofore approved by Owners Committee Action, together with any
     modifications to such design that may be approved from time to time by
     Owners Committee Action.

          "Reducing Lender" has the meaning specified in Section 2.01(c).

          "Reduction Amount" means, as of any Commitment Increase Effective
     Date, for each then Reducing Lender, the amount by which (i) the aggregate
     unpaid principal amount of such Reducing Lender's Loans immediately prior
     to such Commitment Increase Effective Date exceeds (ii) the product of (A)
     the Adjustment Percentage for such Commitment Increase Effective Date
     multiplied by (B) such 

                                       21
<PAGE>
 
     Reducing Lender's Commitment effective as of such Commitment Increase
     Effective Date.

          "Refined Products Purchase Agreement" means the Product Sales
     Agreement (Refined Products-CITGO Petroleum Corporation) dated as of July
     1, 1993 between the Borrower and CITGO, as amended, modified and
     supplemented from time to time to the extent permitted by Section 7.17.

          "Refinery" means at any time the refinery of the Borrower located in
     Houston, Texas.

          "Refinery Expansion Project" means the Borrower's project to upgrade
     the capacity of the Refinery substantially in accordance with the
     Recommended Design.

          "Register" has the meaning specified in Section 10.06(b).

          "Regulations" means the Amended and Restated Limited Liability Company
     Regulations of the Borrower dated July 1, 1993, as amended, modified and
     supplemented on the Closing Date and thereafter from time to time to the
     extent no Event of Default occurs under Section 8.01(i)(iii) as a result of
     such amendment, modification or supplement, unless the context otherwise
     requires.

          "Regulations G, T, U and X" means Regulations G, T, U and X of the
     Board of Governors of the Federal Reserve System.

          "Reimbursement Obligations" means, at the time of any determination,
     all matured and unpaid reimbursement or repayment obligations of the
     Borrower to the Issuer with respect to Letters of Credit.

          "Representatives" means, with respect to any Person, the directors,
     officers, employees, Affiliates, accountants, advisors, attorneys,
     consultants or other agents of such Person, or any other representatives of
     such Person or of any of such directors, officers, employees, Affiliates,
     accountants, advisors, attorneys, consultants or other agents.

          "Reportable Event" means, with respect to any Benefit Plan of any
     Person, (i) the occurrence of any of the events set forth in Section
     4043(b) or (c) (other than a Reportable Event as to which the provision of
     30 days' notice to the PBGC is waived under applicable regulations),
     4062(e) or 4063(a) of ERISA with respect to such Benefit Plan, (ii) any
     event requiring such Person or any of its ERISA Affiliates to provide
     security to such Benefit Plan under Section 401(a)(29) of the Code or (iii)
     any failure to make a payment required by Section 412(m) of the Code with
     respect to such Benefit Plan.

                                       22
<PAGE>
 
          "Required Lenders" means, at the time of any determination, Lenders
     holding at least 66 2/3% of the then aggregate unpaid principal amount of
     the Notes or, if no such principal amount is then outstanding, Lenders
     having at least 66 2/3% of the Total Commitment; provided, however, that
     for purposes of (a) any amendment of, any consent under, or waiver of any
     failure of the Borrower to perform or observe any term, covenant, condition
     or agreement contained in, Section 7.17(a) (other than with respect to the
     Refined Products Purchase Agreement), (b) any amendment of, or waiver of
     any Event of Default specified in, Section 8.01(i)(i) (other than with
     respect to the Refined Products Purchase Agreement) or (c) any amendment or
     waiver of this proviso, "Required Lenders" means, at the time of any
     determination, Lenders holding at least 80% of the then aggregate unpaid
     principal amount of the Notes or, if no such principal amount is then
     outstanding, Lenders having at least 80% of the Total Commitment.

          "Responsible Officer" means the President, the Chief Financial
     Officer, the Controller, any Vice President or the General Counsel of the
     Borrower.

          "Restricted Payment" means (a) with respect to any Person, any of the
     following effected by such Person:  (i) any declaration or payment of any
     dividend or other distribution, direct or indirect, on account of any
     Capital Securities of such Person now or hereafter outstanding, (ii) any
     direct or indirect redemption, retirement, purchase or other acquisition
     for value of or direct or indirect purchase, payment or sinking fund or
     similar deposit for the redemption, retirement, purchase or other
     acquisition for value of, or to obtain the surrender of, any Capital
     Securities of such Person now or hereafter outstanding or any warrants,
     options or other rights to acquire or subscribe for purchase of Capital
     Securities of such Person or any Subsidiary of such Person now or hereafter
     outstanding or (iii) any payment or prepayment of principal of, premium or
     interest, fees or other charges on or with respect to, and any redemption,
     purchase, retirement, defeasance, sinking fund or similar payment of, or of
     any claim to rescission with respect to, any Affiliate Indebtedness of such
     Person or any Indebtedness of such Person subordinated by the terms thereof
     to the prior payment of the Obligations and (b), with respect to the
     Borrower or any Subsidiary, any of the following effected directly or
     indirectly by such Person:  any payment or prepayment of principal of or
     premium on or with respect to, or any redemption, purchase, retirement,
     defeasance, sinking fund or similar payment of, or of any claim to
     rescission with respect to, any Permitted Replacement Debt that is not
     Affiliate Indebtedness of the Borrower.  Without limiting the generality of
     the foregoing, a "Restricted Payment" by the Borrower or any Subsidiary
     includes any distribution made by the Borrower, or any Subsidiary for the
     account of the Borrower, to an Owner pursuant to the Regulations,
     including, without limitation, Sections 7.2, 7.4, 7.5 and 7.6 thereof.

          "Service Agent" has the meaning specified in Section 10.08.

                                       23
<PAGE>
 
          "Specified Production Capability" means the demonstration by all
     principal operating units included in the Refinery Expansion Project, as a
     whole, of the capability (a) to operate for at least seven consecutive days
     with the designed feedstocks at a minimum of 95% of the feedrate in the
     Recommended Design and (b) to produce refined products substantially in
     accordance with the product slate and quality specifications included in
     the Recommended Design.

          "S&P" means Standard and Poor's Rating Group.

          "Subsidiary" means any corporation or other Person of which Capital
     Securities 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 Capital Securities of such corporation or other Person 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 the Borrower.

          "Supplemental Supply Agreement" means the Supplemental Supply
     Agreement, dated as of May 5, 1993, between the Borrower and Petroleos de
     Venezuela, S.A., a corporation organized under the laws of the Republic of
     Venezuela, as amended, modified and supplemented from time to time to the
     extent permitted by Section 7.17, unless the context otherwise requires.

          "Supplement to Credit Agreement" means an agreement in the form of
     Exhibit 2.01(c)-2 which amends this Agreement to increase the Total
     Commitment pursuant to and in accordance with Section 2.01(c).

          "Supply or Purchase Contracts" means (a) the Crude Supply Agreement,
     (b) the Supplemental Supply Agreement and (c) the Refined Products Purchase
     Agreement.

          "Taxes" means all taxes, assessments, fees, levies, imposts, duties,
     deductions, withholdings or other charges of any nature whatsoever from
     time to time or at any time imposed by any Governmental Requirement,
     excluding, in the case of each Lender, the Issuer, each Co-Agent and the
     Agent, taxes imposed on its income, and franchise taxes and doing business
     taxes imposed on it by the laws of any jurisdiction (or political
     subdivision thereof).

          "Term Credit Agreement" means the Credit Agreement dated as of the
     date of this Agreement among the Borrower, the lenders and co-agents that
     are parties thereto and The Bank of New York, as the agent for such
     lenders, as amended, modified and supplemented from time to time.

          "Term Loan" means any loan made to the Borrower under the Term Credit
     Agreement.

                                       24
<PAGE>
 
          "Term Loan Obligations" has the meaning assigned to the term
     "Obligations" in the Term Credit Agreement.

          "Term Loan Termination Date" has the meaning assigned to the term
     "Termination Date" in the Term Credit Agreement.

          "Terminating Lender" has the meaning specified in Section 2.03(e).

          "Termination Date" means, with respect to each Lender on the date of
     any determination, the earlier of (a) the later of (i) May 3, 1996 and (ii)
     the last Extension Date approved by such Lender as such Lender's
     Termination Date 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
     under this Agreement.

          "Termination Event" means, with respect to any Benefit Plan, (a) any
     Reportable Event with respect to such Benefit Plan which is likely to
     result in the termination of such Benefit Plan, (b) the termination of such
     Benefit Plan, or the filing of a notice of intent to terminate such Benefit
     Plan, or the treatment of any amendment to such Benefit Plan as a
     termination under Section 4041(c) of ERISA, (c) the institution of
     proceedings to terminate such Benefit Plan under Section 4042 of ERISA, (d)
     the appointment of a trustee to administer such Benefit Plan under Section
     4042 of ERISA or (e) any occurrence similar to any of those referred to in
     clauses (a) through (d) above under the applicable Governmental
     Requirements of a foreign country.

          "TLLCA" means the Texas Limited Liability Company Act.

          "Total Commitment" means $70,000,000, the aggregate amount of the
     Commitments, as such amount may be increased or reduced from time to time
     pursuant to and in accordance with Sections 2.01(b), 2.01(c) and 2.04.

          "Type" refers to a Base Rate Loan or a Eurodollar Rate Loan.

          "United States Person" has the meaning specified in Section 3.06(d).

          "Welfare Plan" means an "employee welfare benefit plan" as defined in
     Section 3(1) of ERISA in which any personnel of the Borrower or any ERISA
     Affiliate of the Borrower participate, excluding any Multiemployer Benefit
     Plan subject to ERISA.

          "Wholly-Owned Subsidiary" means any corporation or other Person all of
     whose outstanding Capital Securities are owned and controlled, directly or
     indirectly, by the Borrower.

                                       25
<PAGE>
 
          Section 1.02  Other Definitional Provisions.  (a) Except as otherwise
specified herein, all references herein to any Governmental Requirement defined
or referred to herein, including the Code, ERISA and the TLLCA, shall be deemed
references to such Governmental Requirement or any successor Governmental
Requirement, as the same may have been or may be amended or supplemented from
time to time, and any rules or regulations promulgated thereunder.

          (b) When used in this Agreement, the words "herein," "hereof" and
"hereunder" and words of similar import shall refer to this Agreement as a whole
and not to any provision of this Agreement, and the words "Article," "Section,"
"Annex," "Schedule" and "Exhibit" shall refer to Articles and Sections of, and
Annexes, Schedules and Exhibits to, this Agreement unless otherwise specified.

          (c) Whenever the context so requires, the singular number includes the
plural and vice versa.

          (d) The word "including" (and, with correlative meaning, the word
"include") means including, without limiting the generality of any description
preceding such word.

          (e) References in this Agreement or any other Loan Document to the
Borrower's knowledge shall be deemed references to the actual knowledge of one
or more of the Responsible Officers.

          Section 1.03  Captions.  Captions to Articles, Sections and
subsections of, and Annexes, Schedules and Exhibits to, this Agreement are
included for convenience of reference only and shall not constitute a part of
this Agreement for any other purpose or in any way affect the meaning or
construction of any provision of this Agreement.

                                  ARTICLE II.

                                CREDIT FACILITY

          Section 2.01  The Facility. (a) Each Lender severally agrees, on the
terms and conditions hereinafter set forth, to make Loans to the Borrower from
time to time on any Business Day during the period from the date hereof until
the Termination Date for such Lender in an aggregate amount not to exceed at any
time outstanding such Lender's Commitment; provided, however, at no time shall
any Lender be obligated to make a Loan in excess of such Lender's Ratable
Portion of the Available Credit.  Each Borrowing shall be in an aggregate amount
not less than $1,000,000 or an integral multiple of $100,000 in excess thereof
and shall consist of Loans of the same Type made on the same day by the Lenders
ratably according to their respective Commitments. Within the foregoing limits,
the Borrower may borrow, prepay and reborrow Loans in accordance with the
provisions hereof. The principal amount outstanding of all Loans of any Lender
shall mature and be

                                       26
<PAGE>
 
due and payable, together with accrued and unpaid interest thereon, on the
Termination Date for such Lender.

          (b) (i) Subject to the terms and conditions hereinafter set forth in
this Section 2.01(b), from time to time the then last occurring Termination Date
may be extended at the written request of the Borrower.  Each such request (an
"Extension Request") shall (A) be delivered to the Agent on or before 60 days
prior to the Termination Date the Borrower is requesting be extended, (B) be in
substantially the form of Exhibit 2.01(b) and (C) specify (1) the requested
effective date of such extension, which date (the requested "Extension Effective
Date") shall be no earlier than 60 days after the Agent receives such request
and no later than the first to occur of (a) 90 days after the Agent receives
such request and (b) such Termination Date, and (2) the date to which such
Termination Date is being requested to be extended, which date (the requested
"Extension Date") shall be no later than 364 days after the requested Extension
Effective Date.  If the Agent receives an Extension Request, it will give prompt
notice thereof to each Lender whose Termination Date is the then last occurring
Termination Date (each such Lender being an "Invited Lender"), and each Invited
Lender shall have the right to approve or reject, in its sole and absolute
discretion, such Extension Request by giving the Agent written notice of its
decision on or before 5:00 P.M. (New York City time) on the date that is the
30th day prior to the requested Extension Effective Date set forth in such
Extension Request (the "Response Date").

          (ii) In the case of each Extension Request made in accordance with
Section 2.01(b)(i):  (A) any Invited Lender subject thereto whose written notice
of its decision respecting such Extension Request is not received by the Agent
by 5:00 P.M. (New York City time) on the Response Date for such Extension
Request shall be deemed to have rejected such Extension Request; (B) if Invited
Lenders subject thereto and having at least 66 2/3% of the Total Commitment 
approve such Extension Request, the Termination Date for such approving Invited
Lenders shall be extended when and as provided in such Extension Request; (C) if
the requisite Invited Lenders subject thereto do not approve such Extension
Request, the Termination Date will not be extended for any Invited Lender
subject thereto; and (D) the Agent shall give the Borrower and all Lenders
prompt notice of the decision of the Invited Lenders subject thereto respecting
such Extension Request.

          (iii)  If pursuant to an Extension Request the last occurring
Termination Date will be extended pursuant to Section 2.01(b)(ii)
notwithstanding that one or more of the Invited Lenders to which such Extension
Request was made will be Non-extending Lenders, then, on the Termination Date of
such Non-extending Lender or Lenders, (A) the Total Commitment shall be reduced
by an amount equal to the amount by which (1) the aggregate Commitments of the
Non-extending Lenders exceeds (2) the aggregate Commitments then assigned
pursuant to Section 2.01(b)(iv), (B) the Commitments of the Non-extending
Lenders whose Commitments have not been then assigned in full pursuant to
Section 2.01(b)(iv) shall be zero and (C) all such Non-extending Lenders shall
cease to be Lenders for any purposes of this Agreement, but shall
continue to be entitled to the 

                                       27
<PAGE>
 
benefits of Sections 3.04, 3.05, 3.06 and 10.02 as well as to amounts accrued
for their respective accounts pursuant to Section 2.05(a) or (b) or any other
Loan Document and not yet paid.

          (iv) The Borrower may at any time before the Termination Date for any
Non-extending Lender replace such Lender as a Lender by designating in a notice
given to the Agent one or more Eligible Assignees to replace such Lender, which
notice shall specify the percentage of such Lender's Commitment, Loans, Note,
participation in Letters of Credit and other rights and obligations hereunder
relative to the Commitment of such Lender to be assigned to each such Eligible
Assignee, and each such Eligible Assignee, if not already a Lender, shall be
subject to the approval of the Agent and the Issuer, which shall not be
unreasonably withheld.  If the Borrower so designates an Eligible Assignee as a
replacement or one of the replacements for a Non-extending Lender and such
Eligible Assignee either is already a Lender or is approved by the Agent and the
Issuer, then the Agent shall give notice thereof to such Non-extending Lender
and, thereupon, such Lender shall promptly consummate an assignment to such
replacement or replacements of the percentage specified in the Borrower's notice
designating such replacement or replacements of such Lender's Commitment, Loans,
Note, participations in Letters of Credit and other rights and obligations
hereunder relative to the Commitment of such Lender by delivering an Assignment
Agreement to the Agent in accordance with Section 10.06, and the Termination
Date for each such replacement shall be the date set forth in the applicable
Extension Request.  For purposes of Section 3.04(a), a Lender consummating an
assignment pursuant to this Section 2.01(b) shall be deemed to have been paid on
the effective date of such assignment all its Eurodollar Rate Loans then being
assigned.

          (c) So long as no Default has occurred and is continuing, the Borrower
may request from time to time, subject to the approval of the Agent and the
Issuer (which shall not be unreasonably withheld) and subject to the terms and
conditions hereinafter set forth, that the Total Commitment be increased by
giving written notice thereof to the Agent; provided, however, that any such
notice must be given no later than 60 days prior to the then last occurring
Termination Date.  Each such notice (a "Notice of Commitment Increase") shall be
in the form of Exhibit 2.01(c)-1 and specify therein:  (i) the effective date of
such increase, which date (the requested "Commitment Increase Effective Date")
shall be no earlier than five Business Days after receipt by the Agent of such
notice; (ii) the amount of the requested increase; provided, however, that after
giving effect to such requested increase, the Total Commitment shall not exceed
$100,000,000; (iii) the identity of the then Lenders, if any, which have agreed
with the Borrower to increase their respective Commitments in an amount such
that their respective Ratable Portions after giving effect to such requested
increase will be the same or greater than their respective Ratable Portions
prior to giving effect to such requested increase (each such then Lender being a
then "Increasing Lender" and each other then Lender which has not agreed to
increase its Commitment or has agreed to increase its Commitment in an amount
such that its Ratable Portion after giving effect to such requested increase
will be reduced being a then "Reducing Lender") and the identity of each
Eligible Assignee not already a Lender,

                                       28
<PAGE>
 
if any, which has agreed with the Borrower to become a Lender to effect such
increase in the Total Commitment (each such then Eligible Assignee being a then
"New Lender"); and (iv) the amount of the respective Commitments of the then
Lenders and such New Lenders from and after the effective date of such increase.
On or before each Commitment Increase Effective Date: (i) the Borrower, each
Lender that has agreed to increase its Commitment on such Commitment Increase
Effective Date and each then New Lender shall execute and deliver to the Agent
and the Issuer for their acceptance a Supplement to Credit Agreement embodying
the provisions of the Notice of Commitment Increase relating to the increase in
the Total Commitment to be effected on such Commitment Increase Effective Date;
and (ii) if the Agent and the Issuer accept such Supplement to Credit Agreement
and no Default has occurred and is continuing, (A) the Agent shall give prompt
notice of such acceptance to each Co-Agent and each Lender, (B) it shall become
effective, and the Total Commitment shall be increased to the amount specified
therein, on such Commitment Increase Effective Date, (C) the Borrower shall
execute and deliver to each then New Lender a Note payable to the order of such
Lender in the face principal amount equal to such Lender's Commitment and (D)
the Borrower shall execute and deliver to each other Lender whose Commitment is
then being increased, against receipt by the Borrower of such Lender's then
existing Note, a new Note in the face principal amount equal to such Lender's
Commitment as so increased. On each Commitment Increase Effective Date: (i) each
then New Lender and each then Increasing Lender shall, by wire transfer of
immediately available funds, deliver to the Agent such Lender's New Funds Amount
for such Commitment Increase Effective Date, which amount, for each such Lender,
shall constitute Loans made by such Lender to the Borrower pursuant to Section
2.01 on such Commitment Increase Effective Date; and (ii) the Agent shall, by
wire transfer of immediately available funds, pay to each then Reducing Lender
its Reduction Amount for such Commitment Increase Effective Date, which amount,
for each such Lender, shall constitute a prepayment by the Borrower pursuant to
Section 3.03, ratably in accordance with the respective principal amounts
thereof, of the principal amounts of all then outstanding Loans of such Lender
(irrespective of the condition in Section 3.03 that prepayments of principal be
accompanied by the payment of the accrued and unpaid interest thereon, which
each such Lender hereby waives, but subject to the provisions of Section 3.04).
Effective as of each Commitment Increase Effective Date, the Note then or
theretofore delivered to each then New Lender, and the new Note then or
theretofore delivered to each then Increasing Lender, shall evidence such
Lender's ownership of its Ratable Portion, effective as of such Commitment
Increase Effective Date, of all Loans then outstanding, except that the Borrower
shall pay all interest accrued on such Loans to such Commitment Increase
Effective Date and not then paid to the Lenders, including Lenders that are then
Reducing Lenders, ratably in accordance with their Ratable Portions as in effect
during the period of such accrual. Also effective as of each Commitment Increase
Effective Date, each then New Lender and each then Increasing Lender shall be
deemed to have purchased and had transferred to it, and each then Reducing
Lender shall be deemed to have sold and transferred to such New Lenders and
Increasing Lenders, such undivided interest and participation in such Reducing
Lender's interest and participation in all then outstanding Letters of Credit,
the obligations of the Borrower with respect thereto and any security therefor
and any guaranty pertaining

                                       29
<PAGE>
 
thereto at any time existing as is necessary so that such undivided
interests and participations of all Lenders (including each then New Lender)
shall accord with their respective Ratable Portions after giving effect to the
increase in the Total Commitment on such Commitment Increase Effective Date.

          Section 2.02  Making the Loans. (a) Each Borrowing shall be made on
written notice given by the Borrower to the Agent not later than (i) 10:00 A.M.
(New York City time) on the date of the Borrowing in the case of a Borrowing
consisting of Base Rate Loans and (ii) 12:00 Noon (New York City time) on the
third Business Day prior to the date of the Borrowing in the case of a Borrowing
consisting of Eurodollar Rate Loans.  Each such notice of a Borrowing (a "Notice
of Borrowing") shall be in the form of Exhibit 2.02 and shall specify (A) the
date of such Borrowing, (B) the number of Borrowings and the Type and aggregate
principal amount of Loans comprising each Borrowing and (C) in the case of a
Borrowing comprised of Eurodollar Rate Loans, the initial Interest Period for
each such Loan.  Each Notice of Borrowing shall be irrevocable and binding on
the Borrower.  The Agent shall promptly deliver a copy of each Notice of
Borrowing to each Lender.

          (b) Each Lender shall, before (i) 2:00 P.M. (New York City time) on
the date of a Borrowing consisting of Base Rate Loans and (ii) 12:00 Noon (New
York City time) on the date of a Borrowing consisting of Eurodollar Rate Loans,
make available for the account of its applicable Lending Office to the Agent at
the Agent's Office, in immediately available funds, such Lender's Ratable
Portion of such Borrowing.  After the Agent's receipt of such funds and, upon
fulfillment of the applicable conditions set forth in Article IV, the Agent
shall make such funds available to the Borrower's account at the Agent's Office
or as otherwise designated in the Notice of Borrowing.  In the case of any
Borrowing consisting of Base Rate Loans, the Agent will not be required to make
funds so available until 3:00 P.M. (New York City time) on the date of such
Borrowing.

          (c) Unless the Agent has received notice from a Lender prior to (i)
1:00 P.M. (New York City time) on the date of any Borrowing consisting of Base
Rate Loans and (ii) 11:00 A.M. (New York City time) on the date of any Borrowing
consisting of Eurodollar Rate Loans that such Lender will not make available to
the Agent such Lender's Ratable Portion of such Borrowing, the Agent may assume
such Lender has made such portion available to the Agent on the date of such
Borrowing in accordance with Section 2.02(b) and the Agent in its sole
discretion may, in reliance on such assumption, make available to the Borrower
on such date a corresponding amount on behalf of such Lender.  If and to the
extent that such Lender shall not have so made its Ratable Portion of a
Borrowing available to the Agent, such Lender and the Borrower severally agree
to repay to the 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 Agent, at (i) in the
case of the Borrower, the interest rate applicable at the time to Loans
comprising such Borrowing, and (ii) in the case of such Lender, the Federal
Funds Rate until (and including) the third Business Day after demand is made and

                                       30
<PAGE>
 
thereafter at the Base Rate.  If such Lender shall repay to the Agent such
corresponding amount, such amount so repaid shall constitute such Lender's Loan
as part of such Borrowing for purposes of this Agreement.  If the Borrower shall
repay to the Agent such corresponding amount, the Borrower shall have no
liability with respect to losses, costs or expenses otherwise compensable under
Section 3.04 in connection therewith.

          (d) The obligations of the Lenders to make Loans to the Borrower
pursuant to this Agreement are several and not joint or joint and several, and
the failure of any Lender to make the Loan to be made by it as part of any
Borrowing shall not relieve any other Lender of its obligation, if any,
hereunder to make its Loan on the date of such Borrowing, but no Lender shall be
responsible for the failure of any other Lender to make the Loan to be made by
such other Lender on the date of any Borrowing.

          Section 2.03  Letters of Credit. (a) The Issuer agrees, on the terms
and conditions hereinafter set forth, to issue, extend and renew Letters of
Credit from time to time on any Business Day during the period from the date of
this Agreement to but not including the 10th day prior to the then last
occurring Termination Date, in such form as may be requested by the Borrower and
agreed to by the Issuer, which agreement shall not be unreasonably withheld;
provided, however, the Issuer shall have no obligation to, and shall not, issue
any Letter of Credit in excess of the LC Available Amount.  No Lender other than
the Issuer has any obligation to issue any Letter of Credit.

          (b) Each Letter of Credit shall be denominated in Dollars and in no
event shall the expiry date of any Letter of Credit extend beyond one Business
Day prior to the then last occurring Termination Date.  Any extension of any
expiry date or renewal of a Letter of Credit shall constitute an "issuance" of
such Letter of Credit for all purposes of this Agreement.

          (c) In addition to the terms and conditions of this Agreement, each
Letter of Credit shall be issued pursuant to and the Issuer shall be entitled to
the benefits of the applicable Letter of Credit Reimbursement Agreement.  In the
event of any conflict between the terms of any Letter of Credit Reimbursement
Agreement and this Agreement, the terms of this Agreement shall control to the
extent of any such conflict.

          (d) Each issuance of a Letter of Credit shall be made on notice given
by the Borrower to the Agent and the Issuer not later than 12:00 Noon (New York
City time) three Business Days prior to the date of the proposed issuance of the
Letter of Credit.  Each such notice (a "Letter of Credit Request") shall be in
the form of Exhibit 2.03(d), shall be irrevocable and shall specify (i) the
stated amount of the Letter of Credit, (ii) the date of issuance of such Letter
of Credit, (iii) the expiry date of such Letter of Credit, (iv) the beneficiary
of such Letter of Credit and (v) such other terms reasonably satisfactory to the
Issuer as to enable the Issuer to issue such Letter of Credit consistent with
the reasonable requirements of the beneficiary thereof.  The Agent shall
promptly deliver a copy of each Letter of Credit Request to each Lender.  On the
Business Day prior to the date on which

                                       31
<PAGE>
 
such Letter of Credit is to be issued, the Agent shall confirm to the Issuer
that the applicable conditions in Article IV have been satisfied as of such
date.

          (e) Subject to the terms and conditions of this Section 2.03 and
satisfaction of the conditions set forth in Article IV, the Issuer shall on the
date requested in the Letter of Credit Request issue a Letter of Credit for the
account of the Borrower in accordance with the Issuer's usual and customary
business practices and confirm to the Agent and each Lender that
such Letter of Credit has been issued.  Each Lender and the Borrower hereby
acknowledge that each Letter of Credit issued by the Issuer pursuant to this
Agreement is issued by the Issuer on behalf of all Lenders at the time of such
issuance.  Immediately upon the issuance of a Letter of Credit, the Issuer shall
be deemed to have sold and transferred to each such Lender, and each such Lender
shall be deemed to have irrevocably and unconditionally purchased and received
from the Issuer, without recourse or warranty, an undivided interest and
participation, to the extent of such Lender's Ratable Portion thereof, in such
Letter of Credit and the obligations of the Borrower with respect thereto and
any security therefor and any guaranty pertaining thereto at any time existing.
If the Termination Date of any Lender precedes or is on the expiry date of any
Letter of Credit (each such Lender being a "Terminating Lender"), then, on such
Termination Date, the Ratable Portion of each other Lender that is not then a
Terminating Lender shall be adjusted for all purposes of such Letter of Credit
(including, without limitation, the payment by the Issuer of any draw request on
the expiry date of any such Letter of Credit and the obligations of the Lenders
under Section 2.03(g) with respect thereto) by excluding in the determination
thereof the Commitment of such Terminating Lender.

          (f) The Issuer shall promptly notify (i) the Agent and each Lender of
the Issuer's receipt of a draw request under any Letter of Credit, stating the
amount of each Lender's Ratable Portion of such draw request and the date on
which such request will be honored and (ii) the Borrower of the amount of such
draw request and the date on which such request will be honored.  Any failure of
the Issuer to give or any delay in the Issuer's giving any such notice shall not
release or diminish the obligations of the Borrower, the Agent or the Lenders in
respect thereof.  In determining whether to pay under any Letter of Credit, the
Issuer shall have no obligation to the Agent, any Co-Agent or to any Lender
other than to confirm that any documents required to be delivered under such
Letter of Credit have been delivered and that they appear to comply on their
face with the requirements of such Letter of Credit.  IN THE ABSENCE OF GROSS
NEGLIGENCE OR WILLFUL MISCONDUCT ON THE PART OF THE ISSUER, THE ISSUER SHALL
HAVE NO LIABILITY TO THE AGENT, ANY CO-AGENT OR ANY LENDER FOR ANY ACTION TAKEN
OR OMITTED TO BE TAKEN BY IT UNDER OR IN CONNECTION WITH ANY LETTER OF CREDIT,
INCLUDING ANY SUCH ACTION NEGLIGENTLY TAKEN OR NEGLIGENTLY OMITTED TO BE TAKEN
BY IT.

          (g) The Borrower shall pay (either from the proceeds of a Borrowing or
otherwise) to the Issuer on demand at the Issuer's Office in Dollars in
immediately available funds the amount of all Reimbursement Obligations owing to
the Issuer under any Letter

                                       32
<PAGE>
 
of Credit, together with interest thereon at a rate of interest equal to the
Base Rate in effect from time to time for each day from, and including, the date
of payment by the Issuer of the applicable draw request under such Letter of
Credit to, but excluding, the date of payment in full to the Issuer of such
Reimbursement Obligations, irrespective of any claim, setoff, defense or other
right which the Borrower may have at any time against the Issuer or any other
Person. In the event that the Issuer makes any payment under any Letter of
Credit and the Borrower shall not have repaid such amount to the Issuer when
due, the Issuer shall promptly notify the Agent, which shall promptly notify
each Lender of such failure, and, subject to Section 2.03(e), each Lender shall
promptly and unconditionally pay to the Agent for the account of the Issuer the
amount of such Lender's Ratable Portion of such payment in Dollars in
immediately available funds on the Business Day the Agent so notifies such
Lender if such notice is given prior to 12:00 Noon (New York City time) or, if
such notice is given after 12:00 Noon (New York City time), such Lender shall
make its Ratable Portion of such payment available to the Agent prior to 12:00
Noon (New York City time) on the next succeeding Business Day. The Agent shall
promptly pay to the Issuer such amounts received by it from each Lender. All
such payments by such Lenders shall constitute Base Rate Loans made by such
Lenders to the Borrower pursuant to Section 2.01 (irrespective of the
satisfaction of the conditions in Article IV, which are irrevocably waived) and
the Reimbursement Obligations with respect to which such Loans were made shall
thereupon be paid to the extent of such payments; provided, however, if pursuant
to any Governmental Requirement, such payment made by any Lender is not
permitted to be made as a Loan, such Reimbursement Obligation shall be
reinstated and not so reduced by the amount of such payment and such Lender's
participations therein pursuant to Section 2.03(e) similarly shall be reinstated
to such amount.

          (h) If and to the extent any Lender shall not make such Lender's
Ratable Portion of any Reimbursement Obligations available to the Agent for the
account of the Issuer when due in accordance with Section 2.03(g), such Lender
agrees to pay interest on such unpaid amount for the account of the Issuer for
each day from the date such payment is due until the date such amount is paid in
full to the Agent for the account of the Issuer at the Federal Funds Rate until
(and including) the third Business Day after the date due and thereafter at the
Base Rate.  The obligations of the Lenders under this Section 2.03 are several
and not joint or joint and several, and the failure of any Lender to make
available to the Agent for the account of the Issuer its Ratable Portion of any
Reimbursement Obligations when due in accordance with Section 2.03(g) shall not
relieve any other Lender of its obligation hereunder to make its Ratable Portion
of such Reimbursement Obligations so available when so due, but no Lender shall
be responsible for the failure of any other Lender to make such other Lender's
Ratable Portion of such Reimbursement Obligations so available when so due.

          (i) Whenever the Issuer receives a payment of a Reimbursement
Obligation from or on behalf of the Borrower as to which the Agent has received
for the account of the Issuer any payment from a Lender pursuant to Section
2.03(g), the Issuer shall pay to the Agent and the Agent shall promptly pay to
such Lender an amount equal

                                       33
<PAGE>
 
to such Lender's Ratable Portion of such payment from or on behalf of the
Borrower. If any payment by or on behalf of the Borrower and received by the
Issuer with respect to any Letter of Credit is rescinded or must otherwise be
returned by the Issuer for any reason and the Issuer has paid to the Agent for
the account of any Lender any portion thereof, each such Lender shall, upon
notice by the Issuer, forthwith pay over to the Issuer, to the extent it has
received such payment, an amount equal to such Lender's Ratable Portion of the
amount which must be so returned by the Issuer.

          (j) Each Lender, upon the demand of the Issuer, shall reimburse the
Issuer, to the extent the Issuer has not been reimbursed by the Borrower after
demand therefor, for the reasonable costs and expenses (including reasonable
attorneys' fees) incurred by the Issuer in connection with the collection of
amounts due under, and the preservation and enforcement of any rights conferred
by, any Letter of Credit or the performance of the Issuer's obligations under
this Agreement in respect thereof, to the extent of such Lender's Ratable
Portion of the amount of such costs and expenses. The Issuer shall refund any
costs and expenses reimbursed by such Lender that are subsequently recovered
from the Borrower in an amount equal to such Lender's Ratable Portion thereof.

          (k) The obligation of each Lender to make available to the Issuer the
amounts set forth in this Section 2.03 shall be absolute, unconditional and
irrevocable under any and all circumstances, shall be made without reduction for
any set-off, counterclaim or other deduction of any nature whatsoever, may not
be terminated, suspended or delayed for any reason whatsoever, shall not be
subject to any qualification or exception and shall be made in accordance with
the terms and conditions of this Agreement under all circumstances, including,
without limitation, any of the following circumstances:

          (i) any lack of validity or enforceability of this Agreement or any of
     the other Loan Documents;

          (ii) 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 any Letter of Credit (or any Person for whom
     any such transferee may be acting), the Agent, any Co-Agent, the Issuer,
     any Lender or any other Person, whether in connection with this Agreement,
     any Letter of Credit, the transactions contemplated herein or any unrelated
     transactions (including any underlying transaction between the Borrower and
     the beneficiary named in any such Letter of Credit);

          (iii)  any draft, certificate or any other document presented under
     any 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;

          (iv) the surrender or impairment of any security for the performance
     or observance of any of the terms of any of the Loan Documents; or

                                       34
<PAGE>
 
          (v)  the occurrence of any Default.

          (l) (i) If at any time the publicly traded unsecured long-term debt
securities of the Issuer (or of any bank holding company of which such Issuer is
a subsidiary) or its equivalent is rated less than A- (or the equivalent rating
then in effect) by S&P or A3 (or the equivalent rating then in effect) by
Moody's, then the Borrower may, at its option, request that a new Issuer be
appointed, which shall be a Lender reasonably acceptable to the Agent, the
Required Lenders and the Borrower (which acceptance shall not be unreasonably
withheld) that has (or whose bank holding company has) such a rating.  If the
Borrower makes such a request, the Agent shall promptly appoint such a
replacement Issuer.

          (ii) Subject to the appointment and acceptance of a successor Issuer
as provided below, the Issuer may resign at any time by giving notice thereof to
the Agent, the Lenders and the Borrower.  Upon receipt of any such notice of
resignation, the Required Lenders may, with the consent of the Borrower (which
consent shall not be unreasonably withheld), appoint any Eligible Assignee as
the successor Issuer provided that it meets the qualifications set forth in
Section 2.03(l)(i).  If no successor Issuer is so appointed by the Required
Lenders and accepts such appointment within 30 days after the retiring Issuer's
giving of notice of resignation, then the retiring Issuer may, on behalf of the
Lenders and with the consent of the Borrower (which consent shall not be
unreasonably withheld), appoint any Eligible Assignee as the successor Issuer,
provided that it meets the qualifications set forth in Section 2.03(l)(i).

          (iii)  The acceptance of any appointment as the Issuer hereunder by a
successor Issuer shall be evidenced by an agreement entered into by such
successor, in a form satisfactory to the Borrower and the Agent, and from and
after the effective date of such agreement, such successor Issuer shall
thereupon succeed to and become vested with all the rights, powers, privileges,
duties and obligations of the removed or retiring Issuer with respect to Letters
of Credit to be issued from and after such effective date, and the removed or
retiring Issuer shall be discharged from its duties and obligations as Issuer
under the Loan Documents with respect to Letters of Credit to be issued from and
after such effective date.  On such effective date, the Borrower shall pay all
accrued and unpaid fees owed under any Loan Document to the removed or retired
Issuer for acting in its capacity as the Issuer.  After any retiring Issuer's
resignation or removal as Issuer, the provisions of this Section 2.03 shall
continue in effect for such Person's benefit in respect of any actions taken or
omitted to be taken by it while it was acting as the Issuer.

          Section 2.04  Reduction of Commitments.  The Borrower shall have the
right, subject to the terms and conditions set forth in Section 3.02, on at
least three Business Days' notice to the Agent to terminate in whole or, from
time to time, reduce ratably in part the unused portion of the Total Commitment,
provided that each partial reduction of the Total Commitment shall be in an
aggregate amount equal to the lesser of (a) $5,000,000 or an integral multiple
of $1,000,000 in excess thereof or (b) the entire unused portion of the Total
Commitment.  Upon receipt of any such notice, the Agent shall promptly notify
each 

                                       35
<PAGE>
 
Lender of the contents thereof and the amount to which such Lender's
Commitment is to be reduced.

          Section 2.05  Fees. (a) Commitment.  The Borrower agrees to pay,
without duplication, to the Agent, for the account of each Lender, a commitment
fee on such Lender's Ratable Portion of the average daily unused Available
Credit from the Closing Date or the date such Lender becomes a Lender pursuant
to an Assignment Agreement or Supplement to Credit Agreement, as applicable,
until such Lender's Termination Date at the rate of 0.100% per annum, calculated
on the basis of a 360-day year for the actual number of days elapsed, payable in
arrears on each Interest Payment Date, on the date of any reduction of such
Lender's Commitment (to the extent accrued and unpaid on the amount of such
reduction) and on such Lender's Termination Date.

          (b) Letter of Credit Fees.  The Borrower shall pay to the Agent, for
the ratable account of the Lenders, a letter of credit fee on the Letter of
Credit Undrawn Amount for each day at the rate per annum equal to the Applicable
Letter of Credit Fee Percentage in effect on such day, calculated on the basis
of a 360-day year, payable in arrears on each Interest Payment Date and on the
date any Letter of Credit is cancelled or expires to the extent accrued and
unpaid on the amount subject to such cancellation or expiration.

          Section 2.06  Interest; Determination and Protection; Illegality. 
(a) Rates. Each Loan shall bear interest at the rates set forth below, and the
Borrower shall pay interest on the unpaid principal amount of each Loan made by
each Lender from the date of such Loan until such principal amount shall be paid
in full, at the times and at the rates per annum set forth below:

          (i) Base Rate Loans.  During such periods as such Loan is a Base Rate
     Loan, a rate per annum equal at all times to the Base Rate in effect from
     time to time and payable on (A) each Interest Payment Date, commencing June
     30, 1995, (B) the date such Base Rate Loan shall be Converted and (C) the
     Termination Date for such Lender.

          (ii) Eurodollar Rate Loans.  During such periods as such Loan is a
     Eurodollar Rate Loan, a rate per annum equal at all times during each
     Interest Period for such Loan to the Adjusted Eurodollar Rate for such
     Interest Period, payable on (A) the last day of such Interest Period and,
     in the case of a Eurodollar Rate Loan having an Interest Period longer than
     three months, on the three-month anniversary of the first day of such
     Interest Period and (B) the Termination Date for such Lender.

          (iii)  Default Rate.  After the occurrence of any Event of Default
     specified in Section 8.01(a) and consisting of the failure of the Borrower
     to pay any principal of any Note or interest thereon or any Reimbursement
     Obligation and during the 

                                       36
<PAGE>
 
     continuance thereof, automatically and without any action by the Agent, any
     Co-Agent, the Issuer or any Lender, to the extent permitted by applicable
     law, the outstanding Obligations shall bear interest at a rate per annum
     equal to the Default Rate. Such interest shall be payable on demand and
     accrue until the earliest of (A) the waiver of such Event of Default by the
     requisite number of Lenders or the cure of such Event of Default, (B)
     agreement by the requisite number of Lenders to rescind the charging of
     interest at the Default Rate or (C) payment in full of the Obligations and
     termination of the Total Commitment.

          (b) Interest Rate Determination and Protection; Illegality. (i) The
Adjusted Eurodollar Rate for each Eurodollar Rate Loan specified in a Notice of
Borrowing or a Notice of Conversion shall be determined by the Agent two
Business Days before the first day of the Interest Period applicable for such
Loan. The Agent shall give prompt notice to the Borrower and the Lenders of the
applicable Adjusted Eurodollar Rate determined by the Agent for purposes of
Section 2.06(a)(ii), and each such determination by the Agent shall be
conclusive, absent manifest error. If for any reason the Agent is unable to
determine the Adjusted Eurodollar Rate for any Eurodollar Loan, the Agent shall
so notify the Borrower and the Lenders, whereupon:

          (A) such Loan will automatically, on the last day of the then existing
     Interest Period therefor, Convert into a Base Rate Loan (or if such Loan is
     then a Base Rate Loan, will continue as a Base Rate Loan); and

          (B) the obligation of the Lenders to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until the Agent notifies the
     Borrower and the Lenders that the circumstances causing such suspension no
     longer exist.

          (ii) If, with respect to any Eurodollar Rate Loans, any Lender
reasonably determines that the Adjusted Eurodollar Rate for any Interest Period
for such Loans will not adequately reflect the cost to such Lender of making,
funding or maintaining its Eurodollar Rate Loans for such Interest Period, such
Lender shall forthwith so notify the Borrower and the Agent, whereupon:

          (A) each Eurodollar Rate Loan of such Lender that has been affected
     will automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Loan; and

          (B) the obligation of such Lender to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until such Lender shall notify the
     Borrower and the Agent that the circumstances causing such suspension no
     longer exist.

          (iii)  If the Borrower shall fail to deliver to the Agent a Notice of
Conversion in accordance with Section 2.07 to select the duration of any
Interest Period for the 

                                       37
<PAGE>
 
principal amount outstanding under any Eurodollar Rate Loan prior to the last
day of the Interest Period applicable to such Loan, such Loan will
automatically, on the last day of the then existing Interest Period therefor,
Convert into a Base Rate Loan.

          (iv) Notwithstanding any other provision of this Agreement, if any
Lender shall notify the Agent and the Borrower that the introduction of, any
change in the interpretation of or any change in any Governmental Requirement
after the date hereof makes it unlawful, or any central lender or comparable
agency or other Governmental Authority asserts after the date hereof that it is
unlawful, for any such Lender or its Eurodollar Lending Office to perform its
obligations hereunder to make Eurodollar Rate Loans or to fund or maintain
Eurodollar Rate Loans hereunder,

          (A) the obligation of such Lender to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until such Lender shall notify the
     Borrower and the Agent that the circumstances causing such suspension no
     longer exist, and

          (B) each Eurodollar Rate Loan of such Lender then outstanding shall be
     Converted automatically into a Base Rate Loan effective on the Agent's
     receipt of such notification or, if lawful as determined by such Lender in
     good faith, on the last day of the Interest Period then currently
     applicable to such Eurodollar Rate Loan, as the case may be.

          (v) Each Lender will promptly notify the Borrower of any event
occurring after the date of this Agreement which will cause the Adjusted
Eurodollar Rate not to adequately reflect such Lender's costs or which makes it
unlawful for such Lender to make or maintain Eurodollar Rate Loans, and will
designate a different Lending Office if such designation will avoid such
inadequacy or unlawfulness and will not, in the judgment of such Lender, be
otherwise disadvantageous to such Lender.

          Section 2.07  Voluntary Interest Rate Conversion.  The Borrower may on
any Business Day, on notice ("Notice of Conversion") given by the Borrower to
the Agent not later than 12:00 Noon (New York City time) (a) on the third
Business Day prior to the date of the proposed Conversion of Loans into
Eurodollar Rate Loans or (b) prior to the date of the proposed Conversion of
Eurodollar Rate Loans to Base Rate Loans and subject to the provisions of
Section 2.06 and the provisions of Sections 4.04 and 4.05, Convert all Loans of
one Type comprising the same Borrowing or Borrowings into Loans of another Type
or Convert all Eurodollar Rate Loans comprising the same Borrowing or Borrowings
into Eurodollar Rate Loans having a different Interest Period; provided,
however, that any Conversion of any Eurodollar Rate Loans into Base Rate Loans
and of any Eurodollar Rate Loans into Eurodollar Rate Loans having a different
Interest Period shall be made on, and only on, the last day of an Interest
Period for such Eurodollar Rate Loans.  Each such Notice of Conversion shall
specify therein the requested (i) date of such Conversion, (ii) the Loans to be
Converted and (iii) if such Conversion is into Loans constituting Eurodollar

                                       38
<PAGE>
 
Rate Loans or Eurodollar Rate Loans having a different Interest Period, the
duration of the Interest Period for each such Loan.  Each Notice of Conversion
shall be irrevocable and binding on the Borrower.  The Agent shall promptly
deliver a copy of each Notice of Conversion to each Lender.  Each Conversion
shall be in an aggregate amount not less than $1,000,000 or an integral multiple
of $100,000 in excess thereof.

                                  ARTICLE III.

                PAYMENTS, PREPAYMENTS, INCREASED COSTS AND TAXES

          Section 3.01  Payments and Computations. (a) Except as otherwise
specified in Section 2.03 with respect to payments to the Issuer of
Reimbursement Obligations, the Borrower shall make each payment under this
Agreement and under the Notes not later than 12:00 Noon (New York City time) on
the day when due in Dollars to the Agent at the Agent's Office in immediately
available funds. Each payment by the Borrower shall be made without set-off,
counterclaim or other deduction whatsoever. The Agent will promptly thereafter
cause to be distributed like funds relating to the payment of principal or
interest or fees payable to the Lenders (to the extent received by the Agent)
ratably to the Lenders for the account of their respective Lending Offices and
like funds relating to the payment of any other amount payable to any Lender (to
the extent received by the Agent) to such Lender for the account of its Lending
Office, in each case to be applied in accordance with the terms of this
Agreement. Fees payable pursuant to Section 2.05 to a Lender are for the account
of such Lender's Lending Office as such Lender shall designate by notice to the
Agent.

          (b) Whenever any payment hereunder or under the Notes shall be stated
to be due on a day other than a Business Day, such payment shall be made on the
next succeeding Business Day, and such extension of time shall in such case be
included in the computation of payment of interest or fees, as the case may be;
provided, however, if such extension would cause payment of interest on or
principal of Eurodollar Rate Loans to be made in the next succeeding calendar
month, such payment shall be made on the next preceding Business Day.

          (c) All computations of interest hereunder at the Base Rate shall be
made by the Agent on the basis of a year of 365 or 366 days, as the case may be,
for each day that the Prime Rate is the basis for such computation, and on the
basis of a year of 360 days for each day that the Federal Funds Rate is the
basis for such computation, and all computations of interest hereunder based on
the Adjusted Eurodollar Rate shall be made by the Agent on the basis of a year
of 360 days, in each case for the actual number of days (including the first day
but excluding the last day) occurring in the period for which such interest is
payable.  Each determination by the Agent of an interest rate hereunder shall be
conclusive, absent manifest error.

                                       39
<PAGE>
 
          (d) Unless the Agent shall have received notice from the Borrower
prior to the date on which any payment is due to the Lenders that the Borrower
will not make such payment in full, the Agent may assume that the Borrower has
made such payment in full to the Agent on such date and the Agent may, in
reliance upon such assumption, cause to be distributed to each Lender on such
due date an amount equal to the amount then due such Lender.  If and to the
extent the Borrower shall not have so made such payment in full to the Agent,
each Lender shall repay to the Agent forthwith on demand such amount distributed
to such Lender, together with interest thereon, for each day from the date such
amount is distributed to such Lender until the date such Lender repays such
amount to the Agent, at the Federal Funds Rate until (and including) the third
Business Day after demand is made and thereafter at the Base Rate.

          (e) Subject to Section 3.03, payments of Loans shall be applied first
to pay Base Rate Loans and then to pay Eurodollar Rate Loans in the order that
the Interest Periods for such Eurodollar Rate Loans end.  All amounts shall be
paid on the date specified therefor, whether or not such payment would require a
payment of any Eurodollar Rate Loans prior to the last day of the applicable
Interest Periods therefor or would result in losses, costs or expenses
compensable under Section 3.04.

          Section 3.02  Mandatory Prepayments.  If at any time the aggregate
outstanding principal amount of the Loans and the Letter of Credit Obligations
exceeds the Total Commitment then in effect, then the Borrower shall immediately
pay to the Agent for the ratable account of the Lenders the amount of such
excess, together with accrued and unpaid interest to the date of such prepayment
on the principal amount prepaid.

          Section 3.03  Voluntary Prepayments.  The Borrower may, on at least
one Business Day's notice to the Agent stating the proposed date and aggregate
principal amount of the prepayment and the Type of Loans to be prepaid, prepay,
without premium or penalty, the outstanding principal amounts of such Loans
comprising part of the same Borrowing, in whole or ratably in part, together
with accrued and unpaid interest to the date of such prepayment on the principal
amount prepaid.  Such notice shall be irrevocable and the payment amount
specified in such notice shall be due and payable on the prepayment date
described in such notice, together with accrued and unpaid interest on the
amount prepaid.  Partial prepayments of Loans shall be in an aggregate principal
amount equal to the lesser of (a) $1,000,000 or an integral multiple of $100,000
in excess thereof and (b) the aggregate outstanding principal amount of such
Loans.

          Section 3.04  Funding Losses Relating to Eurodollar Rate Loans. (a) If
any payment of principal of, or any Conversion of, any Eurodollar Rate Loan is
made other than on the last day of an Interest Period relating to such Loan, as
a result of a payment pursuant to Section 3.02 or 3.03, a Conversion pursuant to
Section 2.07, an acceleration of the maturity of any Note in accordance with the
terms hereof, or for any other reason, the Borrower shall, upon demand by any
Lender, pay to such Lender at its Eurodollar Lending Office any amounts required
to compensate such Lender for any losses or reasonable

                                       40
<PAGE>
 
expenses which it may actually incur by reason of the liquidation or
reemployment of the amounts so prepaid or of deposits or other funds acquired by
such Lender to fund or maintain such Loan. In any such case, such loss and
reasonable expense shall be equal to the sum, without duplication of amounts, of
(i) the costs and expenses incurred (other than loss of the Applicable Margin)
in connection with, or by reason of, any such event and (ii) an amount equal to
the excess, if any, as reasonably determined by such Lender of (A) the amount of
interest which would have accrued on the amount so paid, Converted or
accelerated for the period from the date of such payment, Conversion or
acceleration to the last day of the Interest Period for such Loan at the
Adjusted Eurodollar Rate (minus the Applicable Margin) applicable to such Loan
over (B) the amount of interest, as reasonably determined by such Lender, which
would have accrued to such Lender on such amount by placing such amount on
deposit for a comparable period with prime banks in the London interbank market.

          (b) The Borrower shall indemnify each Lender against any loss or
reasonable expense incurred by such Lender as a result of (i) any failure by the
Borrower to fulfill on the date of any proposed Borrowing of or Conversion into
a Eurodollar Rate Loan the applicable conditions set forth in Article IV or (ii)
any failure by the Borrower to make a Borrowing of or Conversion into a
Eurodollar Rate Loan after the Borrower has given a notice requesting the same
in accordance with the provisions hereof.  In any such case, such loss and
reasonable expense shall be equal to the sum, without duplication of amounts, of
(i) the costs and expenses incurred (other than loss of the Applicable Margin)
by such Lender by reason of the liquidation or reemployment of deposits or other
funds acquired by such Lender to effect or maintain such Eurodollar Rate Loan in
connection with, or by reason of, any such event and (ii) an amount equal to the
excess, if any, as reasonably determined by such Lender of (A) the amount of
interest which would have accrued on the amount of the Eurodollar Rate Loan that
was to have been made or into which another Loan was to have been Converted for
the period from the date such Borrowing or Conversion was to have been made to
the last day of the Interest Period for such Loan that would have commenced on
such date at the Adjusted Eurodollar Rate (minus the Applicable Margin)
applicable to such Loan over (B) the amount of interest, as reasonably
determined by such Lender, which would have accrued to such Lender on such
amount by placing such amount on deposit for a comparable period with prime
banks in the London interbank market.

          (c) Any Lender demanding payment pursuant to this Section 3.04 shall
deliver to the Borrower a statement reasonably setting forth the amount and
manner of determining the loss or expense for which such demand is made, which
statement shall be conclusive, absent manifest error.

          Section 3.05  Increased Costs; Capital Adequacy. (a) If after the date
of this Agreement any change in any applicable Governmental Requirement
(including, without limitation, the adoption of any new Governmental
Requirement) or in the interpretation or administration thereof by any central
bank or comparable agency or any other

                                       41
<PAGE>
 
Governmental Authority charged with the interpretation or administration thereof
(whether or not having the force of law) shall impose, modify or deem applicable
any reserve, special deposit or similar requirement against assets of, deposits
with or for the account of or credit extended by any Lender or the Issuer
(except any such reserve requirement that is reflected in the Eurodollar Rate
Reserve Percentage), or shall impose on such Lender or the Issuer or the London
interbank market any other condition affecting this Agreement or Eurodollar
Loans made by such Lender or any Letter of Credit or participation therein, and
the result of any of the foregoing shall be to increase the cost to such Lender
or the Issuer of making or maintaining any Eurodollar Loan or increase the cost
to such Lender or the Issuer of issuing or maintaining any Letter of Credit,
paying or funding any draw request thereunder or purchasing or maintaining a
participation therein, or to reduce the amount of any sum received or receivable
by such Lender hereunder or the Issuer hereunder or under any Letter of Credit
Reimbursement Agreement (whether of principal, interest, fees or otherwise) by
an amount reasonably determined by such Lender or the Issuer to be material,
then the Borrower will pay to such Lender or the Issuer, as the case may be,
following receipt of a notice from such Lender or the Issuer, as the case may
be, to such effect, such additional amount or amounts as will compensate such
Lender or the Issuer, as the case may be, for such additional costs incurred or
reduction suffered.

          (b) If any Lender or the Issuer shall have determined that (i) the
adoption after the date of this Agreement of any Governmental Requirement,
guideline or directive regarding capital adequacy, (ii) any change after the
date of this Agreement in any such Governmental Requirement, guideline or
directive or in the interpretation or administration thereof after the date of
this Agreement by any central bank or comparable agency or any other
Governmental Authority charged with the interpretation or administration thereof
or (iii) compliance by any Lender (or any lending office of such Lender) or the
Issuer or any Lender's or the Issuer's holding company with any request or
directive regarding capital adequacy issued after the date of this Agreement
under any Governmental Requirement or guideline (whether or not having the force
of law) of any Governmental Authority has or would have the effect of reducing
the rate of return on such Lender's or the Issuer's capital or on the capital of
such Lender's or the Issuer's holding company, if any, as a consequence of this
Agreement, the Commitment of such Lender or the Loans made by such Lender or
participations in Letters of Credit purchased by such Lender pursuant hereto or
the Letters of Credit issued by the Issuer pursuant hereto to a level below that
which such Lender or the Issuer or such Lender's or the Issuer's holding company
could have achieved but for such applicability, adoption, change or compliance
(taking into consideration such Lender's or the Issuer's policies and the
policies of such Lender's or the Issuer's holding company with respect to
capital adequacy) by an amount reasonably determined by such Lender or the
Issuer to be material, then from time to time the Borrower will pay to such
Lender or the Issuer, as the case may be, following receipt of a notice from
such Lender or the Issuer, as the case may be, to such effect, such additional
amount or amounts as shall compensate such Lender or the Issuer or such Lender's
or the Issuer's holding company for any such reduction suffered.

                                       42
<PAGE>
 
          (c) The Issuer or any Lender requiring payment under this Section 3.05
shall deliver to the Borrower a statement reasonably setting forth the amount
and manner of determination thereof, which statement shall be conclusive, absent
manifest error.

          (d) Each Lender will promptly notify the Borrower of any event
occurring after the date of this Agreement of which it has knowledge which will
entitle such Lender to compensation pursuant to this Section 3.05 and will
designate a different Lending Office if such designation will avoid the need
for, or reduce the amount of, such compensation and will not, in the judgment of
such Lender, be otherwise disadvantageous to such Lender.

          Section 3.06  Taxes. (a) Any and all payments by the Borrower of the
Obligations shall be made free and clear of and without deduction for any and
all present or future Taxes.  If the Borrower shall be required by any
Governmental Requirement to deduct any Taxes from or in respect of any sum
payable hereunder to any Lender, the Issuer, any Co-Agent or the Agent, (i) the
sum payable by the Borrower shall be increased by the amount necessary so that,
after making all required deductions (including, without limitation, deductions
applicable to additional sums payable under this Section 3.06), such Lender, the
Issuer, such Co-Agent or the Agent (as the case may be) receives an amount equal
to the sum it would have received had no such deductions been made, (ii) the
Borrower shall make such deductions and (iii) the Borrower shall pay the full
amount deducted to the relevant taxing authority or other authority in
accordance with applicable Governmental Requirements.

          (b) In addition, the Borrower shall pay any and all present and future
transfer, documentary, stamp and similar Taxes, any and all other excise and
property Taxes, charges and similar levies and all recording and filing Taxes
and fees which arise from any payment made hereunder or from the execution,
delivery or registration of, or otherwise with respect to, this Agreement or any
other Loan Document (hereinafter referred to as "Other Taxes").

          (c) The Borrower shall indemnify each Lender, the Issuer, each Co-
Agent and the Agent for the full amount of Taxes and Other Taxes (including,
without limitation, any Taxes or Other Taxes imposed by any jurisdiction on
amounts payable under this Section 3.06) paid by such Lender, the Issuer, such
Co-Agent or the Agent (as the case may be) and all liabilities (including
penalties, additions to tax, interest and expenses) arising therefrom or with
respect thereto, whether or not such Taxes or Other Taxes were correctly or
legally asserted, INCLUDING PENALTIES, ADDITIONS TO TAX, INTEREST AND EXPENSES
ARISING AS A RESULT OF THE NEGLIGENCE (WHETHER SOLE, JOINT OR CONCURRENT, ACTIVE
OR PASSIVE) ON THE PART OF SUCH LENDER, THE ISSUER, SUCH CO-AGENT OR THE AGENT,
but excluding penalties, additions to tax, interest and expenses arising as a
result of the gross negligence or willful misconduct on the part of such Lender,
the Issuer, such Co-Agent or the Agent.  Payments in respect of the foregoing
indemnification shall be made by the Borrower within five days 

                                       43
<PAGE>
 
after the date such Lender, the Issuer, such Co-Agent or the Agent (as the case
may be) makes demand therefor.

          (d) Within 30 days after the date of any payment of Taxes by the
Borrower pursuant to this Section 3.06, the Borrower shall furnish to the
Lenders, the Issuer, the Co-Agents and the Agent the original or a certified
copy of a receipt evidencing payment thereof.  If the Borrower makes any payment
in respect of any Obligation from any account located outside the United States
or any such payment is made by a payor that is not a United States Person and if
no Taxes are payable in respect of such payment, the Borrower shall furnish to
the Lenders, the Issuer and the Agent a certificate from each appropriate taxing
authority, or an opinion of counsel acceptable to the Agent, in either case
stating that such payment is exempt from or not subject to Taxes.  For purposes
of this Section 3.06, the terms "United States" and "United States Person" shall
have the meanings set forth in Section 7701 of the Code.

          (e) Each Lender that is not a United States Person hereby agrees that:

          (i) it shall, no later than the date of this Agreement (or, if such
     Lender becomes a party hereto pursuant to Section 2.01(b), 2.01(c), 3.07 or
     10.06, the date upon which such Lender becomes a party hereto), deliver to
     the Borrower through the Agent, with a copy to the Agent (A) if any Lending
     Office is located in the United States of America, two accurate and
     complete signed originals of Internal Revenue Service Form 4224 or any
     successor thereto ("Form 4224"), (B) if any Lending Office is located
     outside the United States of America, two accurate and complete signed
     originals of Internal Revenue Service Form 1001 or any successor thereto
     ("Form 1001"), or (C) if such Lender is claiming exemption from withholding
     of United States federal income tax under Section 871(h) or 881(c) of the
     Code with respect to "portfolio interest," a Form W-8 or any successor
     thereto ("Form W-8") (and, if such Lender delivers a Form W-8, a
     certificate representing that such Lender (1) is not a bank for purposes of
     Section 881(c) of the Code, is not subject to regulatory or other legal
     requirements as a bank in any jurisdiction, has not been treated as a bank
     for purposes of any tax, securities law or other filing or submission made
     to any governmental authority, any application made to a rating agency or
     qualification for any exemption from tax, securities law or other legal
     requirements, (2) is not a 10-percent shareholder (within the meaning of
     Section 871(h)(3)(B) of the Code) of the Borrower and (3) is not a
     controlled foreign corporation related to the Borrower (within the meaning
     of Section 864(d)(4) of the Code)), in each case indicating that such
     Lender is on the date of delivery thereof entitled to receive payments of
     principal, interest and fees for the account of such Lending Office or
     Lending Offices under this Agreement free from withholding of United States
     federal income tax;

          (ii) if at any time such Lender changes any Lending Office or selects
     an additional Lending Office, it shall, at the same time or reasonably
     promptly 

                                       44
<PAGE>
 
     thereafter but only to the extent the forms previously delivered
     by it hereunder are no longer effective, deliver to the Borrower through
     the Agent, with a copy to the Agent, in replacement for the forms
     previously delivered by it hereunder, two accurate and complete signed
     originals of Form 4224 or Form 1001, as applicable, or a Form W-8, in each
     case indicating that such Lender is on the date of delivery thereof
     entitled to receive payments of principal, interest and fees for the
     account of such changed or additional Lending Office under this Agreement
     free from withholding of United States federal income tax;

          (iii)  it shall, before or promptly after the occurrence of any event
     (including the passing of time but excluding any event mentioned in clause
     (ii) above) requiring a change in the most recent forms or form previously
     delivered by such Lender pursuant to this Section 3.06(e) and if the
     delivery of the same be lawful, deliver to the Borrower through the Agent,
     with a copy to the Agent, two accurate and complete original signed copies
     of Form 4224 or Form 1001, as applicable, or a Form W-8 in replacement for
     the forms or form previously delivered by such Lender; and

          (iv) it shall, reasonably promptly upon the reasonable request of the
     Borrower to that effect, deliver to the Borrower through the Agent such
     other forms or similar documentation as may be required from time to time
     by any applicable Governmental Requirement, treaty, rule or regulation in
     order to establish such Lender's tax status for withholding purposes.

          (f) The obligations of the Borrower contained in this Section 3.06
shall survive the termination of this Agreement and the payment in full of the
Obligations.

          Section 3.07 Substitution of Lender. If (a) the obligation of any
Lender to make or Convert Loans into Eurodollar Loans has been suspended
pursuant to Section 2.06(b), (b) any Lender has demanded compensation under
Section 3.05 or (c) any Lender has notified the Borrower that it is not capable
of receiving payments without deduction or withholding pursuant to Section 3.06,
the Borrower may replace such Lender by designating in a notice given to the
Agent an Eligible Assignee to replace such Lender, which Eligible Assignee, if
not already a Lender, shall be subject to the approval of the Issuer, which
approval shall not be unreasonably withheld. If the Borrower so designates an
Eligible Assignee, then the Agent shall give notice thereof to the Lender to be
replaced, and thereupon, such Lender shall promptly consummate an assignment of
such Lender's Commitment, Loans, Notes, participations in Letters of Credits and
other rights and obligations hereunder relative to the Commitment of such Lender
to such Eligible Assignee in accordance with Section 10.06. For purposes of
Section 3.04(a), a Lender consummating an assignment pursuant to this Section
3.07 shall be deemed to have been paid on the effective date of such assignment
all its Eurodollar Rate Loans then being assigned.

                                       45
<PAGE>
 
                                  ARTICLE IV.

              CONDITIONS TO LOANS; LETTERS OF CREDIT; CONVERSIONS

          Section 4.01  Conditions to Initial Loans and Initial Letter of
Credit.  The obligation of each Lender to make its initial Loan and the
obligation of the Issuer to issue the initial Letter of Credit are subject to
the Agent's receipt on the Closing Date of each of the following, in sufficient
number for each of the Lenders, the Co-Agents and the Issuer and in form and
substance reasonably satisfactory to the Agent:

          (a) a duly executed Note for each Lender, in each case dated as of May
     5, 1995;

          (b) a Secretary's Certificate, dated the Closing Date, in the form of
     Exhibit 4.01(b)-1, to which shall be attached copies of the Charter
     Documents, as amended, modified and supplemented and in effect on the
     Closing Date, of the Borrower, including, in the case of the Regulations,
     an amendment thereto in the form of Exhibit 4.01(b)-2, and resolutions
     evidencing the Owners Committee Action approving and authorizing the
     applicable Loan Documents and the Borrowings and issuances of the Letters
     of Credit hereunder;

          (c) a copy of the Articles of Organization of the Borrower, certified
     as of a Current Date by the Secretary of State of the State of Texas;

          (d) (i) a good standing certificate with respect to the Borrower,
     issued as of a Current Date by the Comptroller of Public Accounts of the
     State of Texas, and (ii) a certificate of existence with respect to the
     Borrower, issued as of a Current Date by the Secretary of State of the
     State of Texas;

          (e) a certificate, issued by the Secretary of State of the State of
     Alabama to the effect that the Borrower is registered as a foreign limited
     liability company under the name "LYONDELL-CITGO Refining Company L.L.C."
     in that State, and a certificate, issued as of a Current Date by such
     Secretary of State which certifies that the Borrower has not filed a
     certificate of cancellation of such registration;

          (f) opinions of counsel for the Borrower, dated the Closing Date, in
     the forms of Exhibits 4.01(f)-1 and 4.01(f)-2;

          (g) a certificate of a Responsible Officer, dated the Closing Date, in
     the form of Exhibit 4.01(g) to the effect, among others, that (i) the
     representations and warranties set forth in Article V are true and correct
     in all material respects as of the Closing Date (unless made as of a
     specific date as set forth therein) and (ii) no Default exists or would
     exist as a result of making a Loan or the issuance of a Letter of Credit on
     the Closing Date;

                                       46
<PAGE>
 
          (h) evidence that, prior to or on the Closing Date:  (i) all
     outstanding Indebtedness and other amounts owing under the Existing Credit
     Agreement have been or will be paid and discharged in full; (ii)  all
     commitments to lend and issue letters of credit thereunder have been or
     will be terminated; and (iii) any Liens thereunder have been or will be
     released;

          (i) (i) the results of a recent search of the Uniform Commercial Code
     and tax lien records in (A) the offices of the Secretary of State of the
     State of Texas, the Secretary of State of the State of Alabama and the
     Secretary of State of the Commonwealth of Pennsylvania and (B) the probate
     court in all counties in Alabama in which the Borrower's assets are
     located, which shall reveal no Liens on any of the property or assets of
     the Borrower, or any revenues, income or profits therefrom, except
     Permitted Liens, and shall otherwise be satisfactory to the Agent, and (ii)
     the results of a recent search of the real property records of Harris
     County, Texas, which shall reveal no Liens on the Houston Facility, except
     Permitted Liens, and shall otherwise be satisfactory to the Agent;

          (j) an environmental review in form and substance satisfactory to the
     Agent from Brown & Root, Inc. with respect to environmental permits,
     environmental management and implementation of Order SWR No. 30092 issued
     by the Texas Water Commission on April 30, 1993, which order is now being
     administered by the Texas Natural Resource Conservation Commission;

          (k) a duly executed copy of each Fee Letter and payment of all fees
     and reasonable expenses of the Agent, and fees of the Co-Agents, the Issuer
     and the Lenders that are due and payable on the Closing Date pursuant to
     this Agreement or any other Loan Document;

          (l) a feasibility report prepared by Brown & Root, Inc. regarding the
     plans and specifications for the Refinery Expansion Project;

          (m) a duly executed and delivered agreement between the Borrower and 
     the Service Agent to the effect specified in Section 10.08;

          (n) certified copies of the Contribution Agreement and the Refined
     Products Purchase Agreement and one certified copy, to be held by the Agent
     pursuant to its written safekeeping agreement with the Borrower and
     delivered with such copy, of each of the Crude Supply Agreement and the
     Supplemental Supply Agreement, in each case as amended, modified and
     supplemented and in effect on the Closing Date; and

          (o) a duly executed Commercial Letter of Credit Reimbursement
     Agreement in the form attached hereto as Exhibit 2.03(c)-(1) and a duly
     executed 


                                       47
<PAGE>
 
     Standby Letter of Credit Reimbursement Agreement in the form
     attached hereto as Exhibit 2.03(c)-(2).

          Section 4.02  Conditions to Each Borrowing.  The obligation of any
Lender to make a Loan on the occasion of each Borrowing, including its initial
Loan, but not including a Loan pursuant to the second and last sentences of
Section 2.03(g) to fund a drawing under a Letter of Credit, is subject to the
satisfaction of the following conditions precedent that on the date of such
Borrowing:

          (a) the Agent has received a Notice of Borrowing with respect to such
     Loan in accordance with this Agreement;

          (b) the representations and warranties set forth in Article V (other
     than in Section 5.06(a)(ii)) are true and correct in all material respects
     (unless made as of a specific date as set forth therein);

          (c) no Default exists or would exist as a result of making such Loan
     or the application of the proceeds thereof;

          (d) such Loan will not contravene any Governmental Requirements
     applicable to such Lender; and

          (e) satisfaction of the Agent and such Lender that the proceeds of
     such Loan will be used for purposes not inconsistent with Section 5.13.

          Section 4.03  Conditions to Each Letter of Credit.  The obligation of
the Issuer to issue any Letter of Credit, including the initial Letter of
Credit, is subject to the satisfaction of the following conditions precedent
that on the date of the issuance of such Letter of Credit:

          (a) the Agent and the Issuer have received a Letter of Credit Request
     with respect to such Letter of Credit in accordance with Section 2.03(d);

          (b) the Issuer has received a Letter of Credit Reimbursement Agreement
     and such other documents and items relating to such Letter of Credit as the
     Issuer reasonably may request;

          (c) the representations and warranties set forth in Article V (other
     than in Section 5.06(a)(ii)) are true and correct in all material respects
     (unless made as of a specific date as set forth therein);

          (d) no Default exists or would exist as a result of the issuance of
     such Letter of Credit;

                                       48
<PAGE>
 
          (e) the issuance of such Letter of Credit will not contravene any
     Governmental Requirement applicable to the Issuer or any Lender; and

          (f) satisfaction of the Agent and the Issuer that such Letter of
     Credit is being issued for purposes not inconsistent with Section 5.13.

          Section 4.04  Conditions to Conversions.  The obligation of any Lender
to Convert any Loan into a Eurodollar Rate Loan pursuant to a Notice of
Conversion is subject to the satisfaction of the following conditions precedent
that on the date of Conversion:

          (a) the Agent has received a Notice of Conversion in accordance with
     Section 2.07;

          (b) the representations and warranties set forth in Article V (other
     than in Sections 5.05 and 5.06(a)(ii)) are true and correct in all material
     respects (unless made as of a specific date as set forth therein);

          (c)  no Default exists; and

          (d) such Conversion will not contravene any Governmental Requirement
     applicable to such Lender.

          Section 4.05  Deemed Fulfilled Conditions.  Except to the extent that
the Borrower has disclosed in the Notice of Borrowing, Letter of Credit Request
or Notice of Conversion, as the case may be, or in a subsequent notice given to
the Agent prior to 5:00 P.M. (New York City time) on the Business Day before the
requested date for the making of the requested Borrowing, Letter of Credit
issuance or Conversion, that an applicable condition specified in this Article
IV will not be fulfilled as of the requested time for the making of such Loans,
the issuance of such Letter of Credit or such Conversion, the Borrower shall be
deemed to have made a representation and warranty as of such time that the
conditions specified in such clauses have been fulfilled, except that in no
event shall the Borrower make or be deemed to make any representation or
warranty as to Section 4.02(d), 4.03(e) or 4.04(d).  No such disclosure by the
Borrower that a condition specified in this Article IV will not be fulfilled as
of the requested time for the making of the requested Loans, issuance of the
requested Letter of Credit or effecting the requested Conversion shall affect
the right of each Lender not to make the Loans requested to be made by it, the
Issuer not to issue such Letter of Credit or each Lender not to effect such
Conversion if such condition has not been fulfilled at such time.

                                       49
<PAGE>
 
                                   ARTICLE V.

                 REPRESENTATIONS AND WARRANTIES OF THE BORROWER

     In order to induce the Agent, each Co-Agent, the Issuer and each Lender to
enter into this Agreement and to make each Loan and issue each Letter of Credit
requested to be made or issued by it, the Borrower represents and warrants as
follows (which representations and warranties will survive the delivery of any
Note and any other Loan Document and the making of any Loan and the issuance of
any Letter of Credit).

          Section 5.01  Organization; Power; Qualification.  The Borrower (a) is
a limited liability company duly organized, validly existing and in good
standing under the TLLCA and (b) has all requisite power and authority under the
TLLCA and its Charter Documents to own or lease and operate its properties and
to carry on its business as now conducted and as proposed to be conducted.  The
Borrower's Charter Documents reserve management of the Borrower entirely to its
members (as such term is used in the TLLCA).  Each Subsidiary (a) is a limited
liability company or corporation duly organized, validly existing and in good
standing under the laws of the state of its organization and (b) has all
requisite power and authority under the limited liability statute under which it
is organized (or, if it is a corporation, has all requisite corporate power and
authority) to own or lease and operate its properties and to carry on its
business as now conducted and as proposed to be conducted.  The Borrower is, and
each Subsidiary is, duly registered, qualified or licensed and in good standing
as a foreign limited liability company (if it is a limited liability company) or
corporation (if it is a corporation) in good standing in all jurisdictions in
which it owns or leases property or proposes to own or lease property or in
which the carrying on of its business as now conducted or as proposed to be
conducted so requires, except to the extent that failures to be so registered,
qualified or licensed individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect.  As of the date of this Agreement,
(a) Lyondell and CITGO collectively own, directly or indirectly, 100% of the
membership interests of the Borrower and have the right to vote such interests
and to manage the business and affairs of the Borrower consistent with the terms
and provisions of the Regulations and (b) the Borrower has no Subsidiaries.
Each Subsidiary, if any, is a Wholly-Owned Subsidiary.

          Section 5.02  Authorization; Enforceability; Absence of Conflicts;
Required Consents.  The execution, delivery and performance by the Borrower of
this Agreement and each other Loan Document to which it is a party, and the
incurrence of the Indebtedness and other Obligations contemplated hereby and
thereby, are within its power and authority under its Charter Documents and the
TLLCA and have been duly authorized by all proceedings required under its
Charter Documents and the TLLCA.  This Agreement and the Notes have been, and
each of the other Loan Documents to which the Borrower is a party when delivered
to the Agent will have been, duly executed and delivered by the Borrower and
are, or when so delivered will be, the legal, valid and binding obligations of
the Borrower, enforceable against the Borrower in accordance with their
respective terms, 

                                       50
<PAGE>
 
subject to applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting the enforcement of creditors' rights generally and
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law). The execution, delivery and
performance in accordance with their respective terms by the Borrower of the
Loan Documents to which it is a party, and the incurrence of Indebtedness and
other Obligations pursuant thereto, do not and will not (a) violate, breach or
constitute a default under (i) the Charter Documents of the Borrower or any
Subsidiary, (ii) any Governmental Requirement applicable to the Borrower or any
Subsidiary or (iii) any other Material Agreement of the Borrower or any
Subsidiary, (b) result in the acceleration or mandatory prepayment of any
Indebtedness of the Borrower or any Subsidiary or afford any holder of any such
Indebtedness the right to require the Borrower or any Subsidiary to redeem,
purchase or otherwise acquire, reacquire or repay any such Indebtedness or (c)
cause or result in the imposition of or afford any Person the right to obtain
any Lien upon any property or assets of the Borrower or any Subsidiary (or upon
any revenues, income or profits of the Borrower or any Subsidiary therefrom). No
Governmental Approvals are required to be obtained, and no reports or notices to
any Governmental Authority are required to be made, by the Borrower for the
execution, delivery or performance by the Borrower of the Loan Documents or the
enforcement against the Borrower of its obligations thereunder or the incurrence
of the Indebtedness and other Obligations by the Borrower pursuant thereto.

          Section 5.03  Compliance With Laws.  Each of the Borrower and the
Subsidiaries (a) possesses, and is in compliance with the terms and conditions
of, all Governmental Approvals necessary for the ownership or lease and
operation of its property and the carrying on of its business as now conducted
or proposed to be conducted, except for such failures to possess and
noncompliances that individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect, and (b) is in compliance with all
Governmental Requirements applicable to it or any of its properties or assets,
including, without limitation, all applicable Governmental Requirements under
ERISA and Environmental Laws, except for such noncompliances by the Borrower and
the Subsidiaries that individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect.

          Section 5.04  No Defaults.  No Default has occurred and is continuing.
Neither the Contribution Agreement nor any Supply or Purchase Contract has been
terminated.

          Section 5.05 Litigation. There is no Litigation pending or, to the
knowledge of the Borrower, threatened to which the Borrower or any Subsidiary is
or may become a party that (a) questions or involves the validity or
enforceability of any of the Loan Documents, (b) could reasonably be expected to
have a Material Adverse Effect or (c) seeks (or reasonably may be expected to
seek) to rescind, revoke, terminate, cancel, withdraw, suspend, modify or change
adversely or withhold any Material Governmental Approval or any Material
Agreement and in which the remedies sought or expected to be sought, if

                                       51
<PAGE>
 
obtained, could reasonably be expected, individually or in the aggregate, to
have a Material Adverse Effect.

          Section 5.06  Financial Statements; Disclosure. (a) Financial
Statements.  (i) The Financial Statements (including in each case the related
schedules and notes) delivered to the Agent present fairly, in all material
respects, the consolidated financial position of the Borrower and the
Subsidiaries at the respective dates of the balance sheets included therein and
the consolidated results of their operations and their consolidated cash flows
for the respective periods set forth therein and have been prepared in
accordance with GAAP (subject, in the case of interim financial statements, to
normal year-end adjustments).  As of the date of any balance sheet included in
such Financial Statements, neither the Borrower nor any Subsidiary then had any
outstanding Indebtedness to any Person or any Material, individually or in the
aggregate, liabilities of any kind (including contingent obligations, tax
assessments or unusual forward or long-term commitments), or any Material
unrealized or anticipated loss, required to be reflected in such Financial
Statements or in the notes related thereto in accordance with GAAP which were
not so reflected.

          (ii) Since December 31, 1994, no change has occurred in the business,
operations, properties or assets, liabilities, condition (financial or
otherwise) or results of operations of the Borrower that could reasonably be
expected, either alone or together with all other such changes, to have a
Material Adverse Effect.

          (b) Disclosure. (i) As of the date hereof, all Information that has
been made available to the Agent, any Co-Agent, the Issuer or any Lender by or
on behalf of the Borrower prior to the date of this Agreement in connection with
the transactions contemplated by this Agreement is, taken together, true and
correct in all material respects (other than financial budgets and projections)
and does not contain any untrue statement of a material fact or omit to state a
material fact necessary in order to make the statements contained therein not
materially misleading in light of the circumstances under which such statements
were made.

          (ii) All Information that is made available after the date of this
Agreement from time to time to the Agent, any Co-Agent, the Issuer or any Lender
by or on behalf of the Borrower in connection with or pursuant to this
Agreement, any other Loan Document or the transactions  contemplated hereby or
thereby will be, when made available and taken together, true and correct in all
material respects (other than financial budgets and projections) and will not
contain any untrue statement of a material fact or omit to state a material fact
necessary in order to make the statements contained therein not materially
misleading in light of the circumstances under which such statements are made.

          (iii)  All financial budgets and projections that have been or are
hereafter from time to time prepared by or on behalf of the Borrower and made
available to the Agent, any Co-Agent, the Issuer or any Lender pursuant to or in
connection with this Agreement, any other Loan Document or the transactions
contemplated hereby or thereby

                                       52
<PAGE>
 
have been and will be prepared and furnished to the Agent in good faith and were
and will be based on facts and assumptions that are believed by the management
of the Borrower to be reasonable in light of the then current and foreseeable
business conditions of the Borrower and the Subsidiaries and represented and
will represent the Borrower's management's good faith estimate of the
consolidated projected financial performance of the Borrower and the
Subsidiaries based on the information available to the Responsible Officers at
the time so furnished.

          Section 5.07  Taxes.  Each of the Borrower and each Subsidiary have
filed or caused to be filed all Tax returns that are required to have been filed
by or with respect to it in every jurisdiction and have paid all Taxes shown to
be due and payable on such returns and all other Taxes payable by them by
assessment, to the extent such Taxes have become due and payable and before they
have become delinquent, except for (a) any Taxes the amount, applicability or
validity of which is currently being contested in good faith by appropriate
proceedings and with respect to which the Borrower has established adequate
reserves on its books in accordance with GAAP or (b) Taxes, other than Federal
Taxes and Taxes payable to Alabama and Texas Governmental Authorities, to which
this clause (b) does not relate, the nonpayment of which individually or in the
aggregate could not reasonably be expected to have a Material Adverse Effect.
Neither the Borrower nor any Subsidiary is a party to any Tax sharing, Tax
allocation or similar agreement except to the extent the Regulations may be
deemed to be such an agreement.

          Section 5.08  Government Regulation.  Neither the Borrower nor any
Subsidiary is (a) an "investment company" or a company "controlled" by an
"investment company," as such terms are defined in the Investment Company Act of
1940, (b) a "holding company" or a "subsidiary" or an "affiliate" of a "holding
company" or a "public utility," as such terms are defined in the Public Utility
Holding Company Act of 1935, or (c) subject to any Governmental Requirement that
regulates or otherwise limits its ability to issue promissory notes or
securities (other than the Securities Act of 1933, the Trust Indenture Act of
1939 and state "blue sky" laws) or (in the case of the Borrower) to perform its
obligations under the Loan Documents.

          Section 5.09  Employee Benefit Plans.  (a) Neither the Borrower nor
any ERISA Affiliate of the Borrower has incurred or is reasonably expected to
incur any withdrawal liability under ERISA to, or with respect to, any
Multiemployer Benefit Plan; the execution and delivery of this Agreement, the
consummation of the transactions contemplated by this Agreement and the lending
of funds pursuant to the provisions of this Agreement will not involve any
Prohibited Transaction; no Benefit Plan established or maintained by the
Borrower or any ERISA Affiliate of the Borrower, or to which the Borrower or any
ERISA Affiliate of the Borrower has made contributions, had an Accumulated
Funding Deficiency, whether or not waived, as of the last day of the most
recently ended plan year of such Benefit Plan; no liability, individually or in
the aggregate, to the PBGC (other than required insurance premiums, all of which
that have become due have been paid) has been incurred and not satisfied in full
by the Borrower or any ERISA 

                                       53
<PAGE>
 
Affiliate of the Borrower with respect to any Benefit Plan; and no event or
condition has occurred, or is reasonably expected to occur, which presents a
material risk of the termination of any Benefit Plan under circumstances which
could result in a material liability to the Borrower, directly or indirectly or
as a result of the liability of a current or former ERISA Affiliate of the
Borrower; provided, however, for purposes of this Section 5.09(a), a liability
shall be considered material at any time if it could reasonably be expected,
individually or in the aggregate with all other such liabilities, to result in a
Material Adverse Effect.

          (b) No Lien in favor of a Benefit Plan, a Welfare Plan, any
Multiemployer Benefit Plan or the PBGC exists upon any property or assets of the
Borrower or any Subsidiary or upon any revenues, income or profits of the
Borrower or any Subsidiary therefrom nor to the knowledge of any Responsible
Officer has there been any occurrence with respect to any such plan that, with
or without the passage of time, could reasonably be expected to have a Material
Adverse Effect.

          (c) In each case, assuming that the provisions of PL 103-465, the
General Agreement on Tariffs and Trade ("GATT"), were currently in effect, (i)
no Benefit Plan established or maintained by the Borrower or any ERISA Affiliate
of the Borrower would have a "liquidity shortfall" within the meaning of Section
302(c)(5) of ERISA, (ii) the liabilities of any such Benefit Plan, determined on
each of an ongoing and a termination basis, would not be increased, (iii) no
additional PBGC premiums relating to any such Benefit Plan would be required,
(iv) the minimum contribution obligations with respect to any such Benefit Plan
would not be increased solely by reason of the application of the provisions of
GATT, (v) no Lien upon any property or assets of the Borrower or any Subsidiary
(or upon any revenues, income or profits of the Borrower or any Subsidiary
therefrom) would be imposed with respect to obligations and responsibilities to
any such Benefit Plan and (vi) no notice to participants with respect to a level
of funding in any such Benefit Plan would be required.

          Section 5.10  Title to Property; Leases.  In each case, free and clear
of all Liens except for Permitted Liens, the Borrower has (a) good and
indefeasible fee simple title to the Houston Facility and the Birmingport
Facility and good and valid title to the "Ballpark" (the preceding and following
quoted terms having the meanings given them by the Contribution Agreement as in
effect on the date of this Agreement) and (b) sufficient title to the "Company
Pipelines" and the "Easements" to enable the Borrower to use the Company
Pipelines and Easements as the same were used by Lyondell immediately prior to
July 1, 1993, and as the same have been used by the Borrower immediately prior
to the date of this Agreement and as they are intended as of the date of this
Agreement to be used by the Borrower after such date in the operation of the
Refinery in a manner consistent with the Borrower's past practices, and any
defect in title to any portion of the Company Pipelines and the Easements will
not or could not reasonably be expected to have a Material Adverse Effect.  In
each case, free and clear of all Liens except for Permitted Liens, the Borrower
has good and valid title to all its other tangible properties and assets

                                       54
<PAGE>
 
that individually or in the aggregate are Material, and each Subsidiary has good
and valid title to all its tangible properties and assets that individually or
in the aggregate with the tangible properties and assets purported to be owned
by all Subsidiaries are Material. All leases of property or assets by the
Borrower and the Subsidiaries which individually or in the aggregate are
Material are valid and subsisting and in full force and effect, the Borrower and
the Subsidiaries enjoy the quiet and undisturbed possession of such properties
and assets and no default exists under such leases, except for such lack of such
enjoyment and defaults that individually or in the aggregate could not
reasonably be expected to have a Material Adverse Effect.

          Section 5.11  Labor Matters.  There are no strikes, work stoppages,
slowdowns or lockouts pending or, to the knowledge of the Borrower, threatened
against or involving the Borrower or any Subsidiary, other than those that
individually or in the aggregate could not reasonably be expected to have a
Material Adverse Effect.

          Section 5.12  Intellectual Property.  The Borrower owns or possesses
the right to use, and each Subsidiary owns or possesses the right to use, all
Intellectual Property necessary to the conduct of its business as now conducted
or proposed to be conducted, in each case free of any claims or infringements
known to the Borrower, except for claims and infringements that individually or
in the aggregate could not reasonably be expected to have a Material Adverse
Effect.

          Section 5.13  Use of Proceeds.  The Borrower will use (a) the proceeds
of the Loans to refinance Indebtedness of the Borrower outstanding under the
Existing Credit Agreement and for working capital and general business purposes
unrelated to the Refinery Expansion Project and (b) request the issuance of
Letters of Credit consistent with such purposes.  None of the proceeds of the
Loans will be used to purchase or carry (or refinance any borrowing the proceeds
of which were used to purchase or carry) any "margin stock" within the meaning
of Regulation G, T, U or X.  Neither the Borrower nor any Subsidiary owns any
margin stock.  The Borrower does not intend to apply, nor will it apply, any
part of the proceeds of any Loan in any manner or to any purpose that is
unlawful or would involve a violation of any Governmental Requirement relating
to the use of funds applicable to the Borrower or the transactions contemplated
by the Loan Documents, including, without limitation, Regulation G, T, U or X.

                                  ARTICLE VI.

                      FINANCIAL STATEMENTS AND INFORMATION

          So long as any of the Commitments remain in effect and until payment
in full of the Loans, the Letter of Credit Obligations and all other Obligations
that have become due when the Loans and the Letter of Credit Obligations have
been paid in full, unless compliance with the provisions of the following
Sections shall have been waived in writing by the Required Lenders, the Borrower
agrees as follows.

                                       55
<PAGE>
 
          Section 6.01  Reporting Requirements.  The Borrower will furnish to
the Agent:

          (a) Quarterly Financial Statements.  As soon as available and in any
     event within 60 days after the end of each of the first three fiscal
     quarters of each of its fiscal years:

          (i) a consolidated balance sheet of the Borrower and the Subsidiaries
     as of the end of such fiscal quarter, the related consolidated statements
     of income or operations and of cash flows for such fiscal quarter and for
     the portion of the fiscal year ended with such quarter, setting forth in
     each case in comparative form the figures for the corresponding quarter and
     the corresponding portion of the Borrower's previous fiscal year, and the
     notes related thereto, prepared in accordance with GAAP (subject to normal
     year-end adjustments); and

          (ii) a certificate with respect thereto of the Chief Financial
     Officer, the Controller or the Manager, Finance of the Borrower in the form
     of Exhibit 6.01(a);

          (b) Annual Financial Statements.  As soon as available and in any
     event within 120 days after the end of each of its fiscal years, commencing
     with the fiscal year ended December 31, 1994:

          (i) a consolidated balance sheet of the Borrower and the Subsidiaries
     as of the end of such fiscal year and the related consolidated statements
     of income or operations and of cash flows for such fiscal year, setting
     forth in each case in comparative form the figures for the previous fiscal
     year, and the notes related thereto, prepared in accordance with GAAP;

          (ii) the audit report of Coopers & Lybrand, or another nationally
     recognized firm of independent certified public accountants, on such
     consolidated financial statements, which report shall be unqualified and
     state that in the opinion of such accountants such consolidated financial
     statements present fairly, in all material respects, the consolidated
     financial position and results of operations and cash flows of the Borrower
     and the Subsidiaries at the dates and for the periods covered in such
     financial statements and have been prepared in conformity with GAAP and
     that the examination of such accountants in connection with such financial
     statements has been made in accordance with generally accepted auditing
     standards, and that such audit provides a reasonable basis for such opinion
     under the circumstances; and

          (iii)  a certificate of the Chief Financial Officer, the Controller or
     the Manager, Finance of the Borrower in the form of Exhibit 6.01(b);

                                       56
<PAGE>
 
          (c) Refinery Expansion Project Progress Report.  Monthly through the
     month following the In-Service Date, a Refinery Expansion Project progress
     report within 30 days after the month to which the report relates,
     presenting in reasonable detail to the reasonable satisfaction of the Agent
     the status of the construction and completion of the Refinery Expansion
     Project;

          (d) Notices and Information.  Promptly and in any event:

          (i) within five Business Days after (A) the approval by the Owners
     Committee of any budget of any type contemplated by Section 9.2 of the
     Regulations as in effect on the date of this Agreement, or any amendment of
     or supplement to any such budget, a copy of that budget, amendment or
     supplement, (B) the beginning of any fiscal year, if the Owners Committee
     has not approved for such fiscal year any budget of any type contemplated
     by Section 9.2 of the Regulations as in effect on the date of this
     Agreement before the beginning of such fiscal year, a copy of (1) the
     proposed budget in the form most recently submitted to the Owners Committee
     for approval and (2) if such budget is the operating budget, the budget or
     other plan pursuant to which the Borrower is then conducting operations,
     and (C) the sending to the Owners Committee of any business plan of the
     type contemplated by Section 9.6 of the Regulations as in effect on the
     date of this Agreement, a copy of that plan;

          (ii) within five Business Days after the sending or receiving thereof,
     copies of all Material notices and communications sent by the Borrower or
     any Subsidiary to, or received by the Borrower or any Subsidiary from, any
     Governmental Authority, which notices in each case relate to matters that
     have had or could reasonably be expected to have a Material Adverse Effect;

          (iii)  within five Business Days after the sending or receiving
     thereof, copies of all notices of termination or material default sent by
     the Borrower or any Subsidiary to, or received by the Borrower or any
     Subsidiary from, any party to any Material Agreement; and

          (iv) within five Business Days after the effective date thereof, (A)
     copies of all amendments and supplements to and modifications of the
     Borrower's Charter Documents and (B) copies of all amendments and
     supplements to and modifications of any Supply or Purchase Contract;

          (e) Defaults; ERISA; Material Adverse Effect.  Promptly and in any
     event within (i) five Business Days after the Borrower has knowledge of a
     Default, written notice of such Default which specifies the nature and
     duration thereof and what action the Borrower has taken, is taking or
     proposes to take with respect thereto, and (ii) within ten Business Days
     after the Borrower has knowledge of (A) the occurrence of any of the events
     described in Section 8.01(g)(i)-(v) whether or not a Default has occurred
     as a result thereof, written notice of such occurrence, (B) any material

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     adverse change in the business, operations, properties, assets or
     conditions of the Borrower and the Subsidiaries, written notice of such
     change which specifies the nature thereof, or (C) the occurrence of any
     Reportable Event with respect to a Benefit Plan of the Borrower or any
     ERISA Affiliate of the Borrower, written notice of such Reportable Event
     which specifies the nature thereof;

          (f) Litigation.  Promptly and in any event within five Business Days
     after the Borrower has knowledge of the commencement of any Litigation
     involving the Borrower or any of the Subsidiaries or any of their
     respective property or assets which (i) if adversely determined, could
     reasonably be expected to have a Material Adverse Effect, (ii) questions or
     involves the validity or enforceability of any of the Loan Documents or
     (iii) if adversely determined, could reasonably be expected to result in
     the rescission, revocation, termination, cancellation, withdrawal,
     suspension, adverse modification of or change in or withholding of a
     Material Governmental Approval or any Material Agreement and such
     rescission, revocation, termination, cancellation, withdrawal, suspension,
     modification, change or withholding could reasonably be expected,
     individually or in the aggregate, to have a Material Adverse Effect, notice
     of such Litigation; and

          (g) Requested Information.  Such information regarding the Loan
     Documents, the Loans, the books and records, business, affairs, operations,
     property or assets, liabilities, condition (financial or otherwise) or
     results of operations of the Borrower and the Subsidiaries and other
     information concerning the Borrower and the Subsidiaries as the Agent, any
     Co-Agent, the Issuer or any Lender may from time to time reasonably
     request.

          Section 6.02  Books and Records.  The Borrower shall and shall cause
each Subsidiary to keep and maintain a system of accounting established and
administered in accordance with sound business practices and keep and maintain
proper books of records and account.

          Section 6.03  Visits, Inspections and Discussions.  Subject to Section
10.04, the Borrower shall and shall cause each Subsidiary to permit
representatives (whether or not officers or employees) of any Lender, from time
to time during the Borrower's normal daytime business hours, as often as may be
reasonably requested and upon reasonable notice, to (a) visit any of the
premises or property of the Borrower or such Subsidiary, (b) during any such
visit, inspect, and verify the amount, character and condition of, any of the
properties or assets of the Borrower or such Subsidiary, (c) during any such
visit, review and make extracts from the books and records of the Borrower or
such Subsidiary, and (d) during any such visit, discuss the affairs, finances
and accounts of the Borrower or such Subsidiary with its officers, employees or
its independent public accountants (and the Borrower hereby authorizes such
accountants to discuss the finances and affairs of the Borrower and the
Subsidiaries); provided, that in the case of any discussions pursuant to clause
(d), a representative of the Borrower designated by a Responsible Officer must
be

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<PAGE>
 
present, it being understood and agreed by the Borrower that it will cooperate
to cause this condition to be satisfied. Each Lender will pay the costs incurred
by such Lender in exercising its rights under this Section 6.03; provided,
however, that if a Lender exercises its rights under this Section 6.03 after the
occurrence of an Event of Default, then the Borrower will reimburse such Lender
for the reasonable costs incurred by such Lender in connection therewith
promptly after such Lender's request therefor. Nothing in this Agreement or any
other Loan Document does, is intended to or shall be construed as authorizing
the Agent, any Co-Agent, the Issuer or any Lender to conduct or have conducted
for its account or the account of any other Person after the date of this
Agreement any environmental inspection or audit of the Refinery or the real
property on which the Refinery is situated or any other plant, property or
equipment or real property owned or leased by the Borrower on the date of this
Agreement.

                                  ARTICLE VII.

                               CERTAIN COVENANTS

          So long as any of the Commitments remain in effect and until payment
in full of the Loans, the Letter of Credit Obligations and all other Obligations
that have become due when the Loans and the Letter of Credit Obligations have
been paid in full, unless compliance with the provisions of the following
Sections shall have been waived in writing by the Required Lenders, the Borrower
agrees as follows.

          Section 7.01  Maintenance of Existence and Properties. (a) The
Borrower shall and shall cause each Subsidiary that is a limited liability
company when it becomes a Subsidiary to maintain its existence as a limited
liability company under the limited liability company statute under which it was
originally organized.  The Borrower shall cause each Subsidiary that is a
corporation when it becomes a Subsidiary to maintain its existence as a
corporation.  The Borrower shall and shall cause each Subsidiary to (i) be in
good standing in each jurisdiction in which its ownership or lease of properties
or its transaction of business requires it to be registered, qualified or
licensed, except to the extent that failures to be so registered, qualified or
licensed individually or in the aggregate by the Borrower and all Subsidiaries
could not reasonably be expected to have a Material Adverse Effect, and (ii)
keep and maintain all rights, franchises, licenses and privileges useful or
necessary in the conduct of its business, except to the extent that the failure
to keep and maintain such rights, franchises, licenses and privileges
individually or in the aggregate by the Borrower and all Subsidiaries could not
reasonably be expected to have a Material Adverse Effect.

          (b) The Borrower shall and shall cause each Subsidiary to maintain and
preserve all of its properties, owned or leased, that are necessary or useful in
the conduct of its business in good repair, working order and condition,
ordinary wear and tear excepted; provided, however, that no item of property
need be so maintained and preserved if the failure to so maintain and preserve
such item individually or in the aggregate with all other

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<PAGE>
 
items not so maintained and preserved by the Borrower and all Subsidiaries could
not reasonably be expected to have a Material Adverse Effect.

          (c) The Borrower shall and shall cause each Subsidiary to maintain and
protect its ownership of or rights to use all Intellectual Property owned or
used by it in the conduct of its business as now conducted and proposed to be
conducted, in each case free of all claims and infringements known to the
Borrower, except for such failure so to maintain and protect that individually
or in the aggregate respecting all Intellectual Property owned or used by the
Borrower and all Subsidiaries could not reasonably be expected to have a
Material Adverse Effect.

          Section 7.02  Compliance With Governmental Requirements. (a) The
Borrower will and will cause each Subsidiary to comply with all applicable
Governmental Requirements and Governmental Approvals, including, without
limitation, Governmental Requirements under ERISA and applicable Environmental
Laws and applicable Governmental Approvals required by applicable Environmental
Laws, except for such noncompliances that individually or in the aggregate could
not reasonably be expected to have a Material Adverse Effect.

          (b) The Borrower shall and shall cause each Subsidiary to maintain a
policy which, in the reasonable business judgment of the Borrower, is reasonably
designed to promote and monitor continued compliance by their respective
operations and properties with applicable Environmental Laws and applicable
Governmental Approvals required by applicable Environmental Laws.

          Section 7.03  Payment of Taxes and Claims.  The Borrower shall and
shall cause each Subsidiary to pay and discharge or cause to be paid and
discharged promptly when due all Taxes imposed upon it or its revenues, income,
profits or capital or in respect of any of its properties or assets before the
same shall become delinquent or in default, as well as all lawful claims for
labor, materials and supplies or otherwise that, if unpaid, might give rise to a
Lien (other than a Permitted Lien) on such properties or assets or any part
thereof; provided, however, that such payment and discharge by such Person shall
not be required with respect to any such Tax or claim so long as the failure to
make such payment and effect such discharge, together with all other failures
then and theretofore permitted by this clause, could not reasonably be expected
to have a Material Adverse Effect.

          Section 7.04  Insurance; Casualty. (a) The Borrower shall and shall
cause each Subsidiary to maintain insurance with financially sound and reputable
insurance companies or associations in such amounts and covering such risks as
is usually carried by Persons engaged in similar businesses and owning similar
properties in the same general areas in which the Borrower or such Subsidiary
operates, including, without limitation, public liability insurance, casualty
insurance against loss or damage to its properties and assets and business
interruption insurance.

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<PAGE>
 
          (b) In the case of any damage or casualty to any property, plant or
equipment of the Borrower or any Subsidiary, the Borrower will and will cause
such Subsidiary, as determined by the sound business judgment of the Borrower,
to pursue diligently claims available to it under casualty or other applicable
insurance policies (other than business interruption insurance policies)
relating to such property, plant or equipment and shall use the proceeds of such
policies to (i) finance or refinance (through reimbursement of such Person's
treasury or otherwise) in whole or in part the cost of repairing or replacing
such property, plant or equipment promptly and in a good workmanlike manner,
(ii) otherwise reinvest the proceeds in property, plant or equipment for any of
the lubes, aeromatics or refining businesses of the Borrower or, in the case of
proceeds received in respect of the property, plant or equipment of such
Subsidiary, the business of the Borrower or such Subsidiary, or (iii) prepay
Term Loans.

          Section 7.05  Liens.  The Borrower shall not and shall not permit any
Subsidiary to create, assume or permit to exist any Lien on any of its
properties or assets other than Permitted Liens.

          Section 7.06  Restricted Payments.  The Borrower shall not and shall
not permit any Subsidiary to make any Restricted Payment, including any
distribution to the Owners, whether pursuant to or in accordance with Section
7.2, 7.4, 7.5 or 7.6 of the Regulations or otherwise, except:

          (a) so long as no Event of Default exists or would exist after giving
     effect thereto, the Borrower may make distributions to the Owners pursuant
     to and in accordance with Sections 7.2, 7.4, 7.5 and 7.6 of the
     Regulations, including, without limitation, distributions in satisfaction
     of Distribution Debt and advances pursuant to such Section 7.6;

          (b) each Wholly-Owned Subsidiary may make Restricted Payments to the
     Borrower and other Wholly-Owned Subsidiaries;

          (c) the Borrower may make scheduled payments of principal, fees and
     other charges to the holders of Permitted Replacement Debt when due in
     accordance with its terms (including terms of subordination);

          (d) with respect to Qualified Subordinated Debt that is not Permitted
     Replacement Debt:

          (i) if such Indebtedness is owing to LRC pursuant to Section 6.4.(D)
     of the Regulations, the Borrower may make scheduled payments of interest
     thereon so long as no Event of Default exists or would exist after giving
     effect to any such payment;

          (ii) if such Indebtedness is Affiliate Indebtedness of the Borrower
     not owing to LRC pursuant to Section 6.4.(D) of the Regulations, the
     Borrower may make

                                       61
<PAGE>
 
     scheduled payments of interest thereon when due in accordance with its
     terms (including terms of subordination); and

          (iii) if such Indebtedness is not Affiliate Indebtedness of the
     Borrower covered by the foregoing clause (i) or (ii), the Borrower may make
     scheduled payments of principal, interest, fees and other charges to the
     holders of such Qualified Subordinated Debt when due in accordance with its
     terms (including terms of subordination);

          (e) at any time after the Term Loans have been paid in full and the
     Borrower has no right to borrow any additional amount under the Term Credit
     Agreement, the Borrower may pay principal, interest, fees and other charges
     in respect of any Affiliate Indebtedness of the Borrower, but excluding
     distributions in satisfaction of Distribution Debt except to the extent
     permitted by clause (a) above; and

          (f) the Borrower may, pursuant to Section 7.4.(B) of the Regulations,
     make deposits (or be deemed to have made deposits) in the Capital Fund (as
     defined in Exhibit 1 to the Regulations) for the account of CRIC.

Nothing in this Section 7.06 restricts the creation of Distribution Debt in
accordance with Section 7.3.(C) of the Regulations.


          Section 7.07  Limitations on Mergers, Etc.  The Borrower shall not and
shall not permit any Subsidiary to merge or consolidate with or into any Person
or convey, transfer, lease or otherwise dispose of all or substantially all of
its properties and assets in a single transaction or series of transactions;
provided, that any Subsidiary may merge or consolidate with or into or transfer
all or substantially all its properties and assets to any other Subsidiary so
long as no Default exists or would exist after giving effect thereto.

          Section 7.08  Disposition of Assets.  The Borrower shall not and shall
not permit any Subsidiary to sell, lease, license, transfer or otherwise dispose
of any of its properties or assets (or any right to receive revenues, proceeds,
income or profits therefrom), except (a) licensing of technology and
dispositions of inventory, in each case in the ordinary course of business, (b)
dispositions of any property not required to be maintained or preserved pursuant
to Section 7.01(b), (c) dispositions of any property or assets by a Subsidiary
to the Borrower or a Subsidiary or loans or advances of funds by the Borrower to
a Subsidiary, (d) any sale or assignment of delinquent accounts receivable or
other trade receivables (or notes evidencing such receivables) to a collection
agency or similar service in the ordinary course of business as now conducted,
(e) Permitted Liens, (f) Restricted Payments permitted by Section 7.06 and (g)
in transactions permitted by Section 7.07.

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<PAGE>
 
          Section 7.09  Indebtedness.  The Borrower shall not and shall not
permit any Subsidiary to incur, create, assume or suffer to exist any
Indebtedness, except:

          (a) the Loans and Letter of Credit Obligations;

          (b) the Term Loans and Permitted Replacement Debt;

          (c)  Qualified Subordinated Debt;

          (d)  Distribution Debt;

          (e) unsecured Indebtedness of any Subsidiary owing to the Borrower or
     to any other Subsidiary;

          (f) obligations of the Borrower and all Subsidiaries in an aggregate
     amount, without duplication of amounts, not to exceed $5,000,000 at any
     time outstanding in respect of Capital Leases and Indebtedness consisting
     of secured purchase money Indebtedness incurred by the Borrower or any
     Subsidiary in the ordinary course of business;

          (g) obligations in respect of Permitted Interest Rate Protection
     Agreements, other than pursuant to a Guaranty, having a designated notional
     amount not exceeding, at the time entered into, 100% of the total
     commitment then in effect of the lenders parties to the Term Credit
     Agreement to make Term Loans, having a maturity not later than the Term
     Loan Termination Date and providing for regularly scheduled net settlement
     payments based upon nominal interest amounts computed on the basis of fixed
     or floating rates of interest;

          (h) unsecured Indebtedness of the Borrower, in an aggregate amount not
     to exceed $20,000,000 at any time outstanding, incurred to finance "Capital
     Enhancement Projects" (as defined in Section 9.2.(C) of the Regulations) of
     the Borrower in the conduct of the Borrower's business as permitted by
     Section 7.14; and

          (i) additional unsecured Indebtedness of the Borrower, other than
     pursuant to a Guaranty, in an aggregate amount not to exceed $20,000,000 at
     any time outstanding.

          Section 7.10  Transactions With Affiliates.  The Borrower shall not
and shall not permit any Subsidiary to effect any transaction with any Affiliate
of the Borrower except (a) transactions contemplated by the Regulations and the
Supply or Purchase Contracts, (b) transactions permitted by and in accordance
with Sections 5.3 and 5.4 of the Regulations, (c) transactions between or among
the Borrower and any one or more Subsidiaries or between or among Subsidiaries
(except transactions not otherwise permitted by this Article) and (d) any
transaction to the extent not otherwise restricted or prohibited by this Article

                                       63
<PAGE>
 
on terms that are no less favorable to the Borrower or such Subsidiary, as the
case may be, than would be available in a comparable transaction with a Person
that is not an Affiliate of the Borrower.

          Section 7.11  Limitation on Restrictive Covenants.  The Borrower shall
not and shall not permit any Subsidiary to permit to exist any consensual
restriction limiting the ability (whether by covenant, event of default,
subordination or otherwise) of any Subsidiary to (a) pay dividends or make any
other distributions on its Capital Securities held by the Borrower or any other
Subsidiary, (b) pay any obligation owed to the Borrower or any other Subsidiary,
(c) make any loans or advances to or investments in the Borrower or in any other
Subsidiary, (d) transfer any of its property or assets to the Borrower or any
other Subsidiary, (e) incur any Indebtedness to the Borrower or (f) create any
Lien upon its property or assets whether now owned or hereafter acquired or upon
any revenues, income or profits therefrom.

          Section 7.12  Issuance or Disposition of Capital Securities.  The
Borrower shall not permit any Subsidiary to issue any Capital Securities, and
the Borrower shall not and shall not permit any Subsidiary to sell, transfer or
otherwise dispose of any Capital Securities of any Subsidiary, except (a) any
issuance by a Subsidiary of Capital Securities to the Borrower or a Wholly-Owned
Subsidiary and (b) any disposition by the Borrower or any Subsidiary of any
Capital Securities of a Wholly-Owned Subsidiary to the Borrower or another
Wholly-Owned Subsidiary.

          Section 7.13  Investments.  The Borrower shall not and shall not
permit any Subsidiary to purchase or acquire obligations or Capital Securities
of, or any other interest in, or make loans to, or otherwise enter into joint
venture or similar arrangements with, purchase or acquire in a single
transaction or series of transactions all or substantially all of the properties
or assets of, or any business unit of, any Person, except:  (a) Permitted
Investments; (b) temporary loans and advances by the Borrower or any Subsidiary
to any of its officers or other employees which are made in the ordinary course
of business for travel, entertainment or other business expenses; (c) current
accounts receivable of the Borrower or any Subsidiary which arise in the
ordinary course of its business and adjustments offered to account debtors
(other than Affiliates of the Borrower) with respect thereto which are made in
the ordinary course of its business; (d) cooperative arrangements entered into
by the Borrower in the ordinary course of its business of operating the Refinery
with other Persons engaged in operations in the Houston Ship Channel area in
connection with their compliance with applicable Governmental Requirements
relating to environmental, health and safety matters, including loans or
advances of funds or equipment to, or acquisitions of the Capital Securities or
the funding of, Gulf Coast Waste Disposal Authority, Clean Channel Association,
Inc. or any similar entity; and (e) acquisitions permitted by Section 7.07.

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<PAGE>
 
          Section 7.14  Business.  The Borrower shall not, directly or
indirectly, make any material change in the nature or type of the Borrower's
business as carried on by it as of the date of this Agreement, except such
changes as are contemplated as a result of the Refinery Expansion Project or are
incidental or reasonably related to such business, and the Borrower shall not
permit any Subsidiary to engage in any business other than any type of business
in which the Borrower is permitted to engage under this Section 7.14.

          Section 7.15  Fiscal Year.  The Borrower shall not and shall not
permit any Subsidiary to change its fiscal year from the calendar year.

          Section 7.16  Financial Covenants. (a) Debt to Total Capitalization
Ratio.  The Borrower shall not permit the Debt to Total Capitalization Ratio at
the end of any fiscal quarter of the Borrower to be greater than 0.60 to 1.00.

          (b) Coverage Ratio.  The Borrower shall not permit the Coverage Ratio
at the end of any fiscal quarter of the Borrower to be less than 2.00 to 1.00.

          (c) Consolidated Net Worth.  The Borrower shall not permit
Consolidated Net Worth to be less than (a) $375,000,000 at December 31, 1994,
(b) $525,000,000 at December 31, 1995, (c) $535,000,000 at December 31, 1996,
(d) $545,000,000 at December 31, 1997 and (e) $555,000,000 at December 31, 1998
and at each December 31st thereafter.

          (d) Average Debt to EBITDA Ratio.  The Borrower shall not permit the
Average Debt to EBITDA Ratio at the end of any fiscal quarter of the Borrower to
be greater than (i) 4.5 to 1.0 through the fiscal quarter ending September 30,
1997 and (ii) 4.0 to 1.0 for each fiscal quarter ending thereafter.

          Section 7.17  Certain Material Agreements. (a) The Borrower shall not,
and shall not permit any Subsidiary to:

          (i) amend, modify, repudiate, supplement or terminate prior to the
     scheduled termination date (or any effective extension of such date) the
     Crude Supply Agreement or the Refined Products Purchase Agreement, except
     to the extent that any such amendment, modification or supplement, together
     with all previous amendments, modifications and supplements covered by this
     clause (i), could not reasonably be expected to have a Material Adverse
     Effect;

          (ii) without the prior written consent of the Required Lenders (which
     consent shall not be unreasonably withheld), amend, modify or supplement
     any provision of Sections 2.1, 2.3, 2.4, 2.12, 2.13 and 5.7 of the Crude
     Supply Agreement (or any provision of such Sections as incorporated in the
     Supplemental Supply Agreement) in a manner that is detrimental to the
     Borrower or any Subsidiary, other than such amendments or modifications of
     or supplements to such provisions concerning day-to-day performance as are
     customarily waived or modified on a 

                                       65
<PAGE>
 
     temporary basis in the ordinary course of business or pursuant to industry
     custom or practice; or

          (iii)  without the prior written consent of the Required Lenders
     (which consent shall not be unreasonably withheld), otherwise amend,
     modify, repudiate, supplement or terminate prior to the scheduled
     termination date (or any effective extension of such date) the Supplemental
     Supply Agreement;

provided, that all adjustments contemplated by any Supply or Purchase Contract
as in effect on the date hereof that are made utilizing the methodology, or in
accordance with the parameters, set forth therein (including in any schedules or
exhibits thereto), shall not constitute amendments, modifications or supplements
for purposes of this Section 7.17(a); and provided, further, that any amendments
or modifications of or supplements to the Crude Supply Agreement permitted or
consented to under this Section 7.17(a) shall be deemed to be permitted, and
consented to, amendments, modifications or supplements of the Supplemental
Supply Agreement.

          (b) The Borrower shall not amend, modify or supplement its Articles of
Organization, except to the extent that any such amendment, modification or
supplement, together with all previous amendments, modifications and
supplements, could not reasonably be expected to have a Material Adverse Effect.

          (c) The Borrower shall not amend, modify or supplement (i) any of
Sections 2.3.(A), 2.3.(C), 2.3.(D), 5.2, 5.3 or 6.14 of the Contribution
Agreement or Schedule 2.3.(D) to the Contribution Agreement insofar as any such
Section or such Schedule relates to the Lyondell Obligations (it being
understood that if any term defined elsewhere in the Contribution Agreement or
the Schedules or Exhibits to the Contribution Agreement and used (directly or by
inclusion in such a defined term used) in any of such enumerated Sections or
Schedule is amended, modified or supplemented in a manner materially detrimental
to the Lenders with respect to any of such Sections or such Schedule, such
amendment, modification or supplement will be deemed an amendment or
modification of or a supplement to each of the enumerated Sections or Schedule
in which it is used) without the prior written consent of the Required Lenders
(which consent shall not be unreasonably withheld) or (ii) any other term or
condition of the Contribution Agreement in such a manner that the effect
thereof, together with the effect of all previous amendments and modifications
of and supplements to such other terms and conditions, could reasonably be
expected to have a Material Adverse Effect.

          Section 7.18  Use of Proceeds.  The Borrower shall not use or permit
the use of all or any portion of the proceeds of any Loan, or request the
issuance of any Letter of Credit, for any purpose other than as represented and
warranted in Section 5.13.

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                                 ARTICLE VIII.

                                    DEFAULT

          Section 8.01  Events of Default.  Each of the following shall
constitute an "Event of Default":

          (a) The Borrower fails to pay any principal of any Note or any
     Reimbursement Obligation when the same becomes due and payable; or the
     Borrower fails to pay any interest on any Note, any fees required by
     Section 2.05 or any other Loan Document or any other Obligation when the
     same becomes due and payable and such failure continues for five days;

          (b) Any representation or warranty made by the Borrower or any of its
     officers in any Loan Document shall prove to have been incorrect or
     misleading in any material respect when made or deemed made pursuant to
     this Agreement;

          (c) The Borrower shall fail to perform or observe: (i) any term,
     covenant, condition or agreement contained in Section 6.01(e), 7.01(a) (as
     to maintenance of existence by the Borrower), 7.02(a) (as to Environmental
     Laws), 7.05 (except as to Liens for state and local taxes payable to
     Governmental Authorities in states other than Alabama and Texas), 7.07,
     7.08, 7.09 (other than clause (f) thereof), 7.10, 7.11, 7.12, 7.14, 7.16,
     7.17 or 7.18; (ii) any term, covenant, condition or agreement contained in
     Section 7.06 or 7.13 and such failure continues unremedied for a period of
     five Business Days after the earlier to occur of notice of such failure
     being given to the Borrower by the Agent or the Borrower otherwise
     obtaining knowledge of such failure; or (iii) any term, covenant, condition
     or agreement contained in this Agreement or any other Loan Document (other
     than a term, covenant, condition or agreement a failure in the performance
     or observance of which is elsewhere specifically dealt with in this Section
     8.01) and such failure continues unremedied for a period of 30 days after
     the earlier to occur of notice of such failure being given to the Borrower
     by the Agent or the Borrower otherwise obtaining knowledge of such failure;

          (d) (i) The Borrower or any Subsidiary fails to pay when due any
     principal of or interest on any Indebtedness of such Person (other than the
     Loans) having a then outstanding principal amount in excess of $15,000,000,
     (ii) the maturity of any such Indebtedness, in whole or in part, is
     accelerated, or any such Indebtedness, in whole or in part, is required to
     be prepaid or purchased prior to the stated maturity thereof, in accordance
     with the provisions of any document, instrument or agreement evidencing,
     providing for the creation of or concerning such Indebtedness, or (iii) (A)
     any event has occurred and is continuing that permits (or, with the passage
     of time or the giving of notice or both, would permit) any holder or
     holders of such Indebtedness, any trustee or agent acting on behalf of such
     holder or holders or any 

                                       67
<PAGE>
 
     other Person to accelerate such maturity or require any such prepayment or
     purchase and (B) if the document, instrument or agreement evidencing,
     providing for the creation of or concerning such Indebtedness provides for
     a grace period for such event, such event is not cured prior to the end of
     such grace period; provided, that this Section 8.01(d) does not apply to
     (a) Indebtedness of the type referred to in clause (a)(iii) or (iv) of the
     definition thereof, (b) any liability referred to in clause (b) of the
     definition thereof which does not constitute Indebtedness of the type
     referred to in clause (a)(i) or (ii) of the definition thereof or (c)
     Distribution Debt;

          (e) (i) The Borrower or any Subsidiary (A) makes a general assignment
     for the benefit of creditors, (B) pursuant to or within the meaning of any
     Bankruptcy Law, (1) commences a voluntary case or proceeding or (2)
     consents to the appointment of, or the taking possession by, any Custodian
     of it or any substantial part of its assets, (C) takes any limited
     liability company or corporate action to authorize any of the actions set
     forth above in this Section 8.01(e) or (D) admits in writing its inability
     to pay its debts as they become due or its belief that it will become
     unable generally to pay its debts as they become due; or (ii) (A) an
     involuntary case or proceeding is commenced against the Borrower or any
     Subsidiary under and within the meaning of any Bankruptcy Law and such
     involuntary case or proceeding continues undismissed or unstayed for a
     period of 60 days after it is commenced, (B) a Custodian is appointed of it
     or any substantial part of its assets in any such involuntary case or
     proceeding or (C) an order for relief is entered against the Borrower or
     any Subsidiary in any such involuntary case or proceeding; or (iii) any
     Owner applies to any court of competent jurisdiction for the
     dissolution of the Borrower or an event of dissolution (within the meaning
     of the Regulations or the TLLCA) occurs and the business of the Borrower is
     not continued pursuant to the vote of the requisite Owners within 90 days
     after such event of dissolution or the Borrower is not otherwise
     reconstituted in accordance with Section 12.11 of the Regulations within 90
     days after such event of dissolution;

          (f) Judgments, orders or decrees are entered against the Borrower or
     any one or more of the Subsidiaries by one or more courts of competent
     jurisdiction the cost of which to the Borrower and the Subsidiaries
     (without duplication of amounts and without including attorney's fees and
     other expenses incurred by the Borrower or any Subsidiary defending against
     or litigating in connection with any such judgment, order or decree)
     aggregates in excess of $15,000,000, and such judgments, orders and decrees
     continue undismissed, unbonded, undischarged or unstayed for a period of 30
     days;

          (g) (i) Any Termination Event occurs with respect to any Benefit Plan
     of the Borrower or any Subsidiary or any of their respective ERISA
     Affiliates, (ii) any Accumulated Funding Deficiency, whether or not waived,
     exists with respect to any such Benefit Plan, (iii) the Borrower, any
     Subsidiary or any of their respective ERISA Affiliates is in "default" (as
     defined in Section 4219(c)(5) of ERISA) with 

                                       68
<PAGE>
 
     respect to payments owing to any Multiemployer Benefit Plan as a result of
     such Person's complete or partial withdrawal (as described in Section 4203
     or 4205 of ERISA) therefrom, (iv) the Borrower, any Subsidiary or any of
     their respective ERISA Affiliates fails to pay when due an amount that is
     payable by it to the PBGC or to any such Benefit Plan under Title IV of
     ERISA, (v) a proceeding is instituted by a fiduciary of any such Benefit
     Plan against the Borrower, any Subsidiary or any of their respective ERISA
     Affiliates to enforce Section 515 of ERISA and such proceeding has not been
     dismissed within 30 days thereafter, (vi) any Multiemployer Benefit Plan to
     which the Borrower or any of its ERISA Affiliates is or has made or accrued
     an obligation to make contributions shall reorganize or become insolvent or
     (vii) any other event or condition occurs or exists with respect to any
     such Benefit Plan, except that no event or condition referred to in clauses
     (i) through (vii) above shall constitute an Event of Default if it,
     together with all other such events or conditions at the time existing, has
     not subjected and could not reasonably be expected to subject the Borrower
     or any Subsidiary to any liability in excess of $25,000,000 or otherwise,
     alone or in the aggregate, could not reasonably be expected to have a
     Material Adverse Effect;

          (h) The Borrower or any Subsidiary (or any Affiliate of the Borrower)
     institutes any proceedings seeking to establish that any provision of any
     Loan Document is invalid, not binding or unenforceable;

          (i) (i) Any Supply or Purchase Contract is terminated for any reason
     by any party thereto prior to its stated termination date or any effective
     extension of such date, or any party to any Supply or Purchase Contract
     shall fail to perform or observe any term, covenant, condition or agreement
     contained therein to be performed or observed by it and such failure, or
     such failure together with all other failures by any party or parties to
     any such agreements, could reasonably be expected to have a Material
     Adverse Effect; (ii) any other Material Agreement is terminated for any
     reason by any party thereto prior to its stated termination date or any
     effective extension of such date, or any party to any such Material
     Agreement shall fail to perform or observe any term, covenant, condition or
     agreement contained therein to be performed or observed by it and such
     termination or failure, or such termination or failure together with all
     other such terminations and failures by any party or parties to any such
     agreements, could reasonably be expected to have a Material Adverse Effect,
     and such termination or failure continues unremedied for a period of 30
     days after the earlier to occur of notice of such termination or failure
     being given to the Borrower by the Agent or the Borrower otherwise
     obtaining knowledge of such termination or failure; (iii) (A) any of
     Sections 3.1.(A), 5.3, 5.4, 6.2.(B), 6.2.(D), 6.2.(E), 6.2.(F), 6.3, 6.4,
     6.6, 6.7, 6.8, 7.2, 7.3, 7.4, 7.5, 7.6, 10.5 and 10.6 of the Regulations is
     amended, modified or supplemented (directly or indirectly by means of an
     amendment to the Borrower's Articles of Organization) (it being understood
     that if any term defined elsewhere in the Regulations or the Exhibits to
     the Regulations and used (directly or by inclusion in such a defined term
     used) in
                                       69
<PAGE>
 
     any of such enumerated Sections is amended, modified or supplemented in a
     manner materially detrimental to the Lenders with respect to any of such
     Sections, such amendment, modification or supplement will be deemed an
     amendment or modification of or supplement to each of the enumerated
     Sections in which it is used) without the prior written consent of the
     Required Lenders (which consent shall not be unreasonably withheld) or (B)
     any other term or condition of the Regulations is amended, modified or
     supplemented (directly or indirectly as aforesaid) in such a manner that
     the effect thereof, together with the effect of all previous amendments and
     modifications of and supplements to such other term or conditions, could
     reasonably be expected to have a Material Adverse Effect; (iv) CRIC or LRC
     fails to pay or make any cash contribution or loan to the Borrower required
     by the Regulations and such failure continues unremedied for a period of
     three days; (v) CRIC or LRC materially breaches or violates any other term,
     covenant, condition or agreement contained in the Regulations to be
     performed or observed by it and such breach or violation continues
     unremedied for a period of 90 days after the nondefaulting Owner gives
     written notice thereof to the defaulting Owner pursuant to Section
     12.2.(A)(2) of the Regulations; or (vi) (A) Lyondell fails to perform any
     of the Lyondell Obligations, (B) such failure continues unremedied for a
     period of 90 days after the Borrower or CRIC gives Lyondell written notice
     thereof and (C) such failure, if continued, together with all then
     continuing such failures, could reasonably be expected to have a Material
     Adverse Effect;

          (j)  A Change of Control occurs;

          (k) (i) the Borrower or any ERISA Affiliate of the Borrower does any
     of the following if, individually or in the aggregate, any of the following
     could reasonably be expected to have a Material Adverse Effect: (A) fails
     to make any payments when due to any Multiemployer Benefit Plan that the
     Borrower or such ERISA Affiliate of the Borrower is required to make under
     any agreement relating to such Multiemployer Benefit Plan or any
     Governmental Requirement pertaining thereto; (B) incurs withdrawal
     liability under ERISA to a Multiemployer Benefit Plan; (C) voluntarily
     terminates or, in the case of a "substantial employer" as defined in
     Section 4001(a)(2) of ERISA, withdraws from any Benefit Plan or Multiple
     Employer Plan if such termination or withdrawal could reasonably result in
     the imposition of a Lien upon the properties or assets of the Borrower or
     any Subsidiary (or upon the revenues, income or profits of the Borrower or
     any Subsidiary therefrom) under Section 4068 of ERISA; (D) fails to make
     any required contribution when due to any Plan subject to Section 412(n) of
     the Code that, with the passage of time, could result in a Lien upon the
     properties or assets of the Borrower or any Subsidiary (or upon the
     revenues, income or profits of the Borrower or any Subsidiary therefrom);
     (E) adopts any amendment to a Benefit Plan the effect of which is to
     increase the "current liability" under the Benefit Plan as defined in
     Section 302(d)(7) of ERISA; (F) incurs any liability to the PBGC or to a
     trustee appointed under Section 4042(b) of ERISA (other than required
     insurance
                                       70
<PAGE>
 
     premiums); or (G) acts or fails to act, and, as a result thereof, an event
     similar to any of those referred to in clauses (A) through (F) above could
     occur under the Governmental Requirements of a foreign country;

          (ii) the Borrower or any ERISA Affiliate of the Borrower permits the
     present value of all benefits (irrespective of whether vested) under all
     Benefit Plans that have assets less than benefits (irrespective of whether
     vested) to exceed the "current value," as defined in Section 3(26) of
     ERISA, of the assets of such Benefit Plans by an aggregate amount which
     could reasonably be expected to have a Material Adverse Effect;

          (iii)  the Borrower or any ERISA Affiliate does any of the following
     if, in the aggregate, the effect of such actions could reasonably be
     expected to have a Material Adverse Effect: (A) permits to exist any
     Accumulated Funding Deficiency, whether or not waived, with respect to any
     Benefit Plan; (B) applies for or is granted a funding waiver under Section
     302 of ERISA or Section 412 of the Code; (C) permits to occur any
     Reportable Event with respect to any Benefit Plan or Multiple Employer
     Plan, which Reportable Event is likely to result in the termination of such
     Benefit Plan or Multiple Employer Plan for purposes of Title IV of ERISA;
     (D) permits to be filed a notice of intent to terminate a Benefit Plan or
     Multiple Employer Plan under Section 4041(c) of ERISA; or (E) permits a
     complete or partial withdrawal from a Multiemployer Benefit Plan; or

          (l) (i) LRC shall transfer its interest as a member of the Borrower in
     accordance with the terms of the Regulations to a Person other than an
     "Affiliate" (as defined in the Crude Supply Agreement) of Lyondell or (ii)
     neither CITGO nor any of its "Affiliates" (as defined in the Crude Supply
     Agreement) is a member of the Borrower.

          Section 8.02  Remedies.  During the continuance of any Event of
Default (other than one specified in Section 8.01(e)), the Agent, on notice to
the Borrower, may (but shall not be obligated to), and if so directed by the
Required Lenders shall, do any or all of the following: (a) declare, in whole
or, from time to time, in part, the Obligations to be, and the Obligations shall
thereupon and to that extent become, due and payable; (b) demand that the
Borrower deliver cash collateral to the Agent in an amount equal to the
aggregate amount of the then Letter of Credit Undrawn Amount to be held in
accordance with Section 8.04, whereupon the Borrower shall be obligated to
deliver such cash collateral immediately; and (c) terminate, in whole or, from
time to time, in part, the Commitments (other than the Commitments to make Loans
pursuant to the second and last sentences of Section 2.03(g)); provided,
however, that during the continuance of an Event of Default specified in Section
8.01(l), the Agent shall not be entitled to declare, in whole or in any part,
the Obligations to be due and payable, or to exercise any of the other rights or
remedies set forth in this Section 8.02, solely by reason of such continuance,
and none of the Agent, any Co-Agent, the Issuer or any Lender shall be entitled
to exercise any of its 

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<PAGE>
 
rights or remedies under Section 8.05 or 10.02(c) or the proviso to the second
sentence of Section 6.03 solely by reason of such continuance, unless and until
the date (the "Supply Termination Date"), if any, the Borrower receives a
written notice of termination of the Crude Supply Agreement by the "Supplier"
(as defined in the Crude Supply Agreement) pursuant to Section 3.2(c)(iv) or (v)
of the Crude Supply Agreement, as applicable, by reason of the occurrence of
such Event of Default; and provided, further, that any Event of Default
specified in Section 8.01(l) which occurs shall automatically be cured and no
longer continuing upon the earlier to occur prior to the Supply Termination
Date, if any, applicable thereto of (i) receipt by the Borrower of written
evidence reasonably satisfactory to the Required Lenders of such Supplier's
waiver of its right to terminate the Crude Supply Agreement pursuant to Section
3.2(c)(iv) or (v) thereof, as applicable, by reason of the occurrence of such
Event of Default or (ii) the passage of the 90-day period provided under such
Section 3.2(c)(iv) or (v), as applicable, without such Supplier's having
delivered such Supplier's notice of termination of the Crude Supply Agreement by
reason of the occurrence of such Event of Default. Upon the occurrence of an
Event of Default specified in Section 8.01(e), automatically and without any
notice to the Borrower, (a) the principal of and accrued and unpaid interest on
the Notes and all other Obligations then owing under the Loan Documents shall be
due and payable and (b) the Commitments (other than the Commitments to make
Loans pursuant to the second and last sentences of Section 2.03(g)) shall
terminate. Presentment, demand, protest, notice of protest, notice of default,
notice of dishonor, notice of intent to accelerate and all other notices of any
kind (other than the notice provided for in the first sentence of this Section
8.02) are hereby expressly waived by the Borrower.

          Section 8.03  Application of Proceeds.  During the continuance of any
Event of Default, all payments in respect of the Obligations received by the
Agent may, and shall on the acceleration of the Obligations pursuant to Section
8.01(e), be applied by the Agent to the Obligations, as follows:  (a) first, to
pay (i) interest on and the principal of any portion of any Loan which the Agent
has advanced on behalf of any Lender or (ii) any amount in respect of a drawing
under a Letter of Credit which the Issuer has paid, in either case, for which
the Agent or the Issuer has not then been reimbursed by any Lender or the
Borrower; (b) second, to pay Obligations in respect of any fees, expense
reimbursements or indemnities then due to the Agent or the Issuer; (c) third, to
pay Obligations in respect of any fees, expense reimbursements or indemnities
then due to the Lenders; (d) fourth, to pay interest due in respect of the
Loans; (e) fifth, to pay or prepay principal outstanding on the Loans; and (f)
sixth, to pay all other Obligations, or in such other order and manner as the
Agent shall determine, and the Borrower shall remain liable to the Agent, the 
Co-Agents, the Issuer and the Lenders for any deficiency. If the Agent has funds
available to apply to a portion of, but not all of, one of the amounts described
in clauses (a) through (f) above, then the Agent shall apply such funds to the
applicable parties in proportion to the amounts to which such parties would have
been entitled if the entire amount described in any such clause had been
available.

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<PAGE>
 
          Section 8.04  Cash Collateral.  If cash collateralization of any
Letter of Credit Obligations is required pursuant to any provision of any of the
Loan Documents, including, without limitation, Section 8.02, then such cash
collateralization shall be made by deposit by the Borrower of Dollars in
immediately available funds, in the amount of such required cash
collateralization, into a non-interest bearing cash collateral account at the
Agent's Office, which account shall be under the sole dominion and control of
the Agent and is hereby pledged to the Agent for the benefit of itself, the
Issuer and the Lenders as security for the payment of any Letter of Credit
Obligations and any other Obligations that may become payable under any Loan
Documents.  Funds deposited in such account shall (a) automatically be applied
by the Agent to reimburse the Issuer for all Reimbursement Obligations the
Borrower has not paid, and thereafter (b) may be applied by the Agent against
the Letter of Credit Obligations as they become due or, if the maturity of the
Loans has been accelerated, against payment of any other Obligations under the
Loan Documents as such amounts become due.  Any funds remaining in such account
when all Letter of Credit Obligations and all other Obligations payable under
the Loan Documents have been paid shall be promptly remitted to the Borrower.

          Section 8.05  Set-Off; Suspension of Payment and Performance.  The
Agent, each Co-Agent, the Issuer and each Lender is hereby authorized by the
Borrower, to the extent permitted under Governmental Requirements, at any time
and from time to time, without notice, during any Event of Default, to set-off
against, and to appropriate and apply to the payment of, the Obligations owing
to such Person (whether matured or unmatured, fixed or contingent or liquidated
or unliquidated and including amounts to which such Person is entitled with
respect to Letter of Credit Obligations), any and all liabilities owing by such
Person to the Borrower (whether payable in Dollars or any other currency,
whether matured or unmatured and, in the case of liabilities that are deposits,
whether general or special, time or demand and however evidenced and whether
maintained at a branch or office located within or without the United States).
The rights of the Agent, each Co-Agent, the Issuer and each Lender under this
Section 8.05 are in addition to and cumulative of all other rights and remedies
(including, without limitation, rights pursuant to any banker's lien) which such
Person may have.


          Section 8.06  Sharing of Recoveries. The Agent, each Co-Agent, the
Issuer and each Lender agrees that if, for any reason (whether voluntary,
involuntary, through the exercise of any right of set-off or otherwise), such
Person receives payment of a proportion of the aggregate amount of Obligations
due and payable to it hereunder that is greater than its allocable share
thereof, then the Person receiving such proportionately greater payment shall
purchase participations (which it shall be deemed to have done simultaneously
upon the receipt of such payment) in the rights of the applicable Persons
hereunder so that all such recoveries with respect to the Obligations (net of
costs of collection) shall be properly allocated among the Persons entitled to
the same; provided, however, that if all or part of such proportionately greater
payment received by the purchasing Person is thereafter recovered by or on
behalf of the Borrower from such Person, such purchases shall be rescinded and
the purchase prices paid for such participations shall be returned to such

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<PAGE>
 
Person to the extent of such recovery, but without interest (unless the
purchasing Person is required to pay interest on the amount recovered to the
Person recovering such amount, in which case the selling Lender shall be
required to pay interest at a like rate).  The Borrower expressly consents to
the foregoing arrangements and agrees that any holder of a participation in any
rights hereunder so purchased or acquired pursuant to this Section 8.06 shall,
with respect to such participation, to the extent permitted under Governmental
Requirements, be entitled to all of the rights of a Lender and may exercise any
and all rights of set-off with respect to such participation as fully as though
the Borrower were directly indebted to the holder of such participation for
Obligations in the amount of such participation.

                                  ARTICLE IX.

                                   THE AGENT

          Section 9.01  Appointment and Powers.  Each Lender hereby irrevocably
appoints and authorizes the Agent to act as the agent for such Lender under this
Agreement with such powers as are delegated to the Agent by the terms thereof,
together with such other powers as are reasonably incidental thereto.  The
Agent's duties shall be purely ministerial and the Agent shall have no duties or
responsibilities except those expressly set forth herein.  The Agent shall not
be required under any circumstances to take any action that, in its judgment,
(a) is contrary to any provision of the Loan Documents or Governmental
Requirements or (b) would expose it to any liability or expense against which it
has not been indemnified to its satisfaction.  The Agent, by reason of its
serving as an agent, shall not be a trustee or other fiduciary for any Lender.
The Co-Agents shall have no responsibilities hereunder in their capacities as
Co-Agents.

          Section 9.02 Limitation on Agent's Liability. Neither the Agent nor
any of its directors, officers, employees or agents shall be liable or
responsible to any Co-Agent, the Issuer or any Lender for any action taken or
omitted to be taken by them under or in connection with the Loan Documents,
except for its or their own gross negligence or willful misconduct. The Agent
shall not be responsible to any Co-Agent, the Issuer or any Lender for (a) any
recitals, statements, representations or warranties contained in the Loan
Documents or in any certificate or other document referred to or provided for
in, or received by any Co-Agent, the Issuer or any Lender under, the Loan
Documents, (b) the validity, effectiveness or enforceability of the Loan
Documents or any such certificate or other document or (c) any failure by the
Borrower to perform any of its obligations under the Loan Documents. The Agent
may employ agents and attorneys-in-fact and shall not be responsible to any Co-
Agent, the Issuer or any Lender for the negligence or misconduct of any such
agents or attorneys-in-fact so long as the Agent was not grossly negligent in
selecting or directing such agents or attorneys-in-fact. The Agent shall be
entitled to rely upon any certification, notice or other communication
(including any thereof by telephone, telex, telecopier, telegram or cable)
believed by it to be genuine and correct and to have been signed or given by or
on behalf of the proper Person or Persons, and upon advice and

                                       74
<PAGE>
 
statements of legal counsel, independent accountants or other experts selected
in good faith by the Agent. As to any matters not expressly provided for by the
Loan Documents, the Agent shall in all cases be fully protected as to the Co-
Agents, the Issuer and the Lenders in acting, or in refraining from acting,
under the Loan Documents in accordance with instructions signed by the Required
Lenders, and such instructions of the Required Lenders and any action taken or
failure to act pursuant thereto shall be binding on all of the Lenders.

          Section 9.03  Defaults.  The Agent shall not be deemed to have
knowledge of the occurrence of a Default unless the Agent has received notice
from a Lender, the Issuer or the Borrower specifying such Default and stating
that such notice is a "Notice of Default."  If the Agent receives such a notice
of the occurrence of a Default, then the Agent shall give prompt notice thereof
to the Lenders and the Issuer.  In the event of any Default, the Agent shall
take such action with respect to such Default as shall be directed by the
Required Lenders.  Unless and until the Agent has received such directions, in
the event of any Default, the Agent may (but shall not be obligated to) take
such action, or refrain from taking such action, with respect to such Default as
it deems advisable in the best interests of the Lenders.

          Section 9.04  Rights as a Lender and as Issuer.  The Agent shall, in
its capacity as a Lender, have the same rights and powers under the Loan
Documents as any other Lender and may exercise the same as though it were not
acting as the Agent, and the term "Lender" or "Lenders" shall include such
Person in its individual capacity.  The Agent, in its capacity as the Issuer,
may exercise all the rights and powers of the Issuer under the Loan Documents as
though it were not acting as the Agent.  Each Person acting as the Agent and its
Affiliates may (without having to account therefor to any Lender) accept
deposits from, lend money to and generally engage in any kind of banking, trust
or other business with the Borrower, the Subsidiaries and the Borrower's
Affiliates as if it were not acting as the Agent, and such Person and its
Affiliates may accept fees and other consideration from the Borrower, the
Subsidiaries and the Borrower's Affiliates for services in connection with the
Loan Documents or otherwise without having to account for the same to the
Lenders.

          Section 9.05 Indemnification. The Lenders agree to indemnify the Agent
(to the extent not reimbursed by the Borrower under the Loan Documents), ratably
on the basis of the outstanding Loans and Letter of Credit Obligations of the
Lenders (or, if no Loans or Letter of Credit Obligations are at the time
outstanding, ratably on the basis of their respective Commitments), for any and
all liabilities, losses, damages, penalties, actions, judgments, suits, costs,
expenses or disbursements of any kind and nature whatsoever that may be imposed
on, incurred by or asserted against the Agent in its capacity as agent
(including, without limitation, the costs and expenses that the Borrower is
obligated to pay under the Loan Documents) in any way connected with, relating
to or arising out of the Loan Documents or any other documents contemplated
thereby or referred to therein or the transactions contemplated thereby or the
enforcement of any of the terms thereof or of

                                       75
<PAGE>
 
any such other documents, provided that no Lender shall be liable for any of the
foregoing to the extent they arise from gross negligence or willful misconduct
by the Agent. The obligations of the Lenders under this Section 9.05 shall
survive the termination of this Agreement and the payment in full of the
Obligations.

          Section 9.06  Non-Reliance on Agent and Other Lenders.  Each Lender
agrees that it has made and will continue to make, independently and without
reliance on the Agent or any other Lender, and based on such documents and
information as it deems appropriate, its own credit analysis of the Borrower and
the Subsidiaries, and its own decision to enter into the Loan Documents and to
take or refrain from taking any action in connection therewith.  The Agent shall
not be required to keep itself informed as to the performance or observance by
the Borrower of the Loan Documents or any other document referred to or provided
for therein or to inspect the properties or books of the Borrower or any
Subsidiary.  Except for notices, reports and other documents and information
expressly required to be furnished to the Lenders and the Issuer by the Agent
under the Loan Documents, the Agent shall have no obligation to provide any
Lender or the Issuer with any information concerning the business, status or
condition of the Borrower or any Subsidiary or the Loan Documents which may come
into the possession of the Agent or any of its Affiliates.

          Section 9.07  Resignation of the Agent.  Subject to the appointment
and acceptance of a successor Agent as provided below, the Agent may resign at
any time by giving notice thereof to the Lenders, the Issuer and the Borrower.
Upon receipt of any such notice of resignation, the Required Lenders may, with
the consent of the Borrower (which consent shall not be unreasonably withheld),
appoint any Eligible Assignee as the successor Agent.  If no successor Agent is
so appointed by the Required Lenders and accepts such appointment within 30 days
after the resigning Agent's giving of notice of resignation, then the resigning
Agent may, on behalf of the Lenders and with the consent of the Borrower (which
consent shall not be unreasonably withheld), appoint any Eligible Assignee as
the successor Agent.  Effective on the acceptance by any Person of its
appointment as a successor Agent, such Person shall succeed to and become vested
with all the rights, powers, privileges, duties and obligations of the resigning
Agent and the resigning Agent shall be discharged from its duties and
obligations as Agent under the Loan Documents.  After any resigning Agent's
resignation as Agent, the provisions of this Article IX shall continue in effect
for its benefit in respect of any actions taken or omitted to be taken by it
while it was acting as the Agent.

          Section 9.08 CERTAIN INTENTIONS. THE CO-AGENTS, THE ISSUER AND THE
LENDERS SEVERALLY ACKNOWLEDGE TO THE AGENT THAT THE PROVISIONS OF THIS ARTICLE
IX WHICH RELEASE THE AGENT FROM LIABILITY, LIMIT THE AGENT'S LIABILITY, DUTIES
OR RESPONSIBILITIES OR PROVIDE FOR THE INDEMNIFICATION OF THE AGENT BY THE
LENDERS, INCLUDING, WITHOUT LIMITATION, SECTIONS 9.01, 9.02, 9.03, 9.05 AND
9.06, ARE INTENDED BY THEM TO SAVE AND HOLD THE AGENT HARMLESS FROM THE

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<PAGE>
 
CONSEQUENCES OF ITS OWN NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE OR WILLFUL
MISCONDUCT).

                                   ARTICLE X.

                                 MISCELLANEOUS

          Section 10.01  Notices and Deliveries. (a) Manner of Delivery;
Addresses.  All notices, communications and materials (including all
Information) to be given or delivered pursuant to or in connection with the Loan
Documents shall be given or delivered in writing (which shall include telecopier
transmissions) and shall be delivered at the following respective addresses and
telecopier and telephone numbers and to the attention of the following
individuals or departments:

          (i)  if to the Borrower, to it at:

               12000 Lawndale
               Houston, Texas 77252-2451
               Telecopier No.:  (713) 321-6900
               Telephone No.:  (713) 321-5307

               Attention:  Manager, Finance

               with a copy to:

               LYONDELL-CITGO
                 Refining Company Ltd.
               12000 Lawndale
               Houston, Texas 77252-2451
               Telecopier No.:  (713) 321-6900
               Telephone No.:  (713) 321-4121

               Attention:  General Counsel

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<PAGE>
 
          (ii) if to the Agent or the Issuer, to it at:

               One Wall Street
               18th Floor
               New York, New York 10286
               Telecopier No.: (212) 635-6365
               Telephone No.: (212) 635-4693

               Attention:  Kalyani Bose
                           Agency Function Administration

               with a copy to:

               The Bank of New York
               One Wall Street
               19th Floor
               New York, New York 10286
               Telecopier No.: (212) 635-7923
               Telephone No.: (212) 635-7834

               Attention:  Ray Palmer

         (iii) if to any Lender, to it at the address or telecopier number and
               to the attention of the individual or department set forth below
               such Lender's name under the heading "Notice Address" on Annex A
               or, in the case of a Lender that becomes a Lender pursuant to a
               Supplement to Credit Agreement, set forth under the heading
               "Notice Address" in such Supplement to Credit Agreement, or in
               the case of a Lender that becomes a Lender pursuant to an
               assignment, set forth under the heading "Notice Address" in the
               Assignment Agreement effecting such assignment;

or at such other address or telecopier number or to the attention of such other
individual or department as the party to which such information pertains may
hereafter specify for the purpose in a notice specifically captioned "Notice of
Change of Address" given to each of the other parties to this Agreement.

          (b) Effectiveness.  Each notice and communication and any material to
be given or delivered pursuant to the Loan Documents shall be deemed so given or
delivered (i) if sent by registered or certified mail, postage prepaid, return
receipt requested, on the third Business Day after such notice, communication or
material, addressed as above provided, is delivered to a United States post
office and a receipt therefor is issued thereby, (ii) if sent by any other means
of physical delivery, when such notice, communication or material is delivered
to the appropriate address as above provided, and (iii) if sent by 

                                       78
<PAGE>
 
telecopier, when such notice, communication or material is transmitted to the
appropriate telecopier number as above provided and is received at such number.

          Section 10.02  Expenses; Indemnification.  Whether or not any Loans
are made or any Letters of Credit are issued hereunder, the Borrower shall,
promptly, and in any event within 15 Business Days after receiving a reasonably
detailed statement setting forth the amount and nature thereof:

          (a) to the extent not otherwise paid pursuant to Section 3.06(b), pay
     or reimburse the Agent, each Co-Agent, the Issuer and each Lender for all
     transfer, documentary, stamp and similar taxes, and all recording and
     filing taxes and fees  payable in connection with, arising out of or in any
     way related to, the execution, delivery and performance of the Loan
     Documents or the making of the Loans or the issuance of the Letters of
     Credit, excluding any such taxes imposed as a result of the assignment
     (otherwise than pursuant to Section 2.01(b)(iv) or 3.07) of any Loan or
     portion thereof;

          (b) pay or reimburse the Agent for all reasonable out-of-pocket costs
     and expenses (including reasonable fees and disbursements of legal counsel
     collectively retained by the Agent and appraisers, accountants and other
     experts employed or retained collectively by the Agent) incurred by the
     Agent in connection with, arising out of or in any way related to (i) the
     negotiation, preparation, execution and delivery of (A) the Loan Documents
     and (B) whether or not executed and delivered, any waiver or consent
     thereunder, amendment thereof or supplement thereto or, in the case of this
     Agreement, any assignment pursuant to Section 2.01(b) or 3.07, (ii) the
     administration of and any operations under the Loan Documents, (iii)
     consulting with respect to any matter in any way arising out of, related to
     or in connection with the Loan Documents, including (A) the protection,
     preservation, exercise or enforcement of any of the rights of the Agent,
     the Co-Agents, the Issuer or the Lenders in, under or related to the Loan
     Documents during a Default or (B) the performance of any of the obligations
     of the Agent, the Issuer or the Lenders under or related to the Loan
     Documents or (iv) protecting, preserving, exercising or enforcing any of
     the rights of the Agent, the Issuer or the Lenders in, under or related to
     the Loan Documents during a Default;

          (c) when an Event of Default has occurred and is occurring, pay or
     reimburse each Lender and the Issuer for all reasonable costs and expenses
     (including reasonable fees and disbursements of legal counsel and other
     experts employed or retained by such Lender or the Issuer) at such time
     incurred by such Lender or the Issuer in connection with, arising out of or
     in any way related to protecting, preserving, exercising or enforcing
     during an Event of Default any of its rights in, under or related to the
     Loan Documents;

                                       79
<PAGE>
 
          (d) (i) indemnify each Indemnified Person against, and hold each
     Indemnified Person harmless from, any and all losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     proceedings, disbursements, costs and expenses of any kind or nature
     whatsoever which may be imposed on, incurred by or asserted against such
     Indemnified Person (including, without limitation, the reasonable fees
     charged and disbursements made by counsel to such Indemnified Person,
     whether or not suit is brought) or to which such Indemnified Person may
     become subject arising out of or in connection with or in any way relating
     to or resulting from any actual or threatened Litigation relating to this
     Agreement (including the use of the proceeds of the Loans), the other Loan
     Documents or any transaction contemplated by any of the foregoing, whether
     or not such Indemnified Person is a party thereto, whether direct or
     indirect, whether based on any federal, state or local law or regulation,
     securities or commercial law or regulation or under common law or in equity
     or on contract, tort or otherwise, and whether or not the transactions
     contemplated hereby are ever consummated, and (ii) reimburse each
     Indemnified Person, on demand, for all out-of-pocket costs and expenses
     (including, without limitation, the reasonable fees and disbursements of
     counsel) incurred in connection with any of the foregoing, including,
     without limitation, costs and expenses incurred in connection with
     investigating, defending or participating in any legal proceeding relating
     to any of the foregoing; provided, however, that the Borrower shall not
     indemnify or hold harmless any Indemnified Person from, or reimburse any
     Indemnified Person for, or waive or release any claim for, any losses,
     claims, damages, liabilities, obligations, penalties, actions, judgments,
     suits, proceedings, disbursements, costs or expenses arising out of the
     gross negligence or willful misconduct of such Indemnified Person;
     PROVIDED, FURTHER, THAT IT IS THE EXPRESS INTENTION OF THE BORROWER TO
     INDEMNIFY EACH INDEMNIFIED PERSON AGAINST THE CONSEQUENCES OF ITS OWN OR
     ANY OTHER INDEMNIFIED PARTY'S NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE),
     WHETHER SUCH NEGLIGENCE BE SOLE, JOINT OR CONCURRENT OR ACTIVE OR PASSIVE.
     The Borrower shall not make any claim against any Indemnified Person for
     any special, indirect or consequential damages in respect of any breach or
     wrongful conduct (whether the claim therefor is based on contract, tort or
     duty imposed by law) in connection with, arising out of or in any way
     related to the transactions contemplated by, and the relationship
     established by, the Loan Documents, or any act, omission or event occurring
     in connection therewith; and the Borrower hereby waives, releases and
     agrees not to sue upon any such claim for any such damages, whether or not
     accrued and whether or not known or suspected to exist in its favor; and

          (e) (i) indemnify each Indemnified Person against, and hold each
     Indemnified Person harmless from, any and all losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     proceedings, disbursements, costs and expenses of any kind or nature
     whatsoever which may at any time be imposed on, incurred by or asserted
     against such Indemnified Person (including, without

                                       80
<PAGE>
 
     limitation, the reasonable fees charged and disbursements made by counsel
     to such Indemnified Person, whether or not suit is brought) arising out of
     or in connection with or in any way relating to or resulting from (A) any
     Loan Document, including, without limitation, the use of the proceeds of
     the Loans or the relationship created by any Loan Document between or among
     the Borrower and the Agent, the Co-Agents, the Issuer and the Lenders and
     (B), with respect to or as a direct or indirect result of any acts or
     omissions to act by the Borrower or any Subsidiary or any Affiliate of the
     Borrower under any Environmental Law or with respect to or as a direct or
     indirect result of the manufacture, processing, distribution, use,
     treatment, storage, disposal, transport, handling, release, discharge,
     emission or disposal of pollutants, contaminants, chemicals, toxic or
     hazardous substances, industrial or hazardous wastes or noxious noises or
     odors or presence of any of the foregoing on, under, from or about its real
     property; provided, however, that the Borrower shall not indemnify or hold
     harmless any Indemnified Person from, or reimburse any Indemnified Person
     for, or waive or release any claim for, any losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     disbursements, costs or expenses arising out of the gross negligence or
     willful misconduct of such Indemnified Person; PROVIDED, FURTHER, THAT IT
     IS THE EXPRESS INTENTION OF THE BORROWER TO INDEMNIFY EACH INDEMNIFIED
     PERSON AGAINST THE CONSEQUENCES OF ITS OWN OR ANY OTHER INDEMNIFIED
     PERSON'S NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE), WHETHER SUCH NEGLIGENCE
     BE SOLE, JOINT OR CONCURRENT OR ACTIVE OR PASSIVE.

The obligations of the Borrower under this Section 10.02 shall survive the
termination of this Agreement and the payment in full of the Obligations.

          Section 10.03  Rights Cumulative.  Each of the rights and remedies of
the Agent, the Issuer and the Lenders under the Loan Documents shall be in
addition to all of their other rights and remedies under the Loan Documents and
Governmental Requirements, including, without limitation, the Texas Uniform
Fraudulent Transfer Act, and nothing in the Loan Documents shall be construed as
limiting any such rights or remedies.

          Section 10.04  Confidentiality. (a) The Agent, each Co-Agent, the
Issuer and each Lender each agrees that (i) it and its Representatives will keep
confidential all non-public information concerning the Borrower or the Owners
which is furnished to it by or on behalf of the Borrower, the Owners or any of
their respective Representatives ("Confidential Information") and, except with
the specific prior written consent of the Borrower or as otherwise expressly
permitted by the terms of this Section 10.04, will not disclose any Confidential
Information, (ii) it and its Representatives will not use Confidential
Information except for the purposes of this Agreement and the Loans, Letters of
Credit or other extensions of credit contemplated hereby, (iii) all recipients
of Confidential 

                                       81
<PAGE>
 
Information will be informed of the confidential nature of the Confidential
Information and instructed not to make use of the Confidential Information in a
manner inconsistent herewith, (iv) it and its Representatives will not make
available any Confidential Information to other Persons for use or copying and
(v) prior to its disclosure of Confidential Information to any of its Outside
Representatives, such Outside Representative shall have executed and delivered a
written confidentiality agreement for the Borrower's benefit substantially in
the form of Exhibit 10.04(c)-3 in respect of the Confidential Information, an
executed original of which it will provide promptly to the Borrower. Each of the
Agent, each Co-Agent, the Issuer and each Lender further agrees that in all
events (i) the Crude Supply Agreement and the Supplemental Supply Agreement
shall be Confidential Information, (ii) no copies may be made of either such
agreement and (iii) any inspection of either such agreement will be restricted
to a limited number of its Representatives and to the premises of the Borrower
or the Agent.

          (b) The term "Confidential Information" does not include information
that any Receiving Party can show (i) has become generally available to the
public other than as a result of disclosure or other fault by a Receiving Party
or its Representatives or (ii) (A) was already in the possession of a Receiving
Party or its Representatives prior to its disclosure to such Person by the
Borrower, an Owner or any of their respective Representatives or (B) became
available to the Receiving Party or its Representatives, in each case under this
clause (ii), free of any restrictions as to its disclosure and from a source,
other than the Borrower, the Owners or any of their respective Representatives,
which to the knowledge of the Receiving Party or the relevant Representative was
not then prohibited from transmitting the information to the Receiving Party or
its Representatives by a contractual, legal, fiduciary or other obligation.

          (c) Each of the Agent, each Co-Agent, the Issuer and each Lender also
agrees to disclose Confidential Information only to (i) its Representatives
requiring such material for the purpose of administering this Agreement and the
transactions contemplated hereby, and (ii) all or any of the Agent, the Co-
Agents, the Issuer, the Lenders, any Prospective Assignees and Prospective
Participants; provided, however, that prior to such disclosure to any
Prospective Assignee or Prospective Participant, a Representative of such
Prospective Assignee or Prospective Participant shall have executed and
delivered a written confidentiality agreement for the Borrower's benefit
substantially in the form of Exhibit 10.04(c)-1 (in the case of any Prospective
Assignee) or Exhibit 10.04(c)-2 (in the case of any Prospective Participant) in
respect of the Confidential Information on behalf of such Eligible Assignee, and
prior to such disclosure to any Outside Representative of such Eligible
Assignee, such Outside Representative shall have executed and delivered a
written confidentiality agreement for the Borrower's benefit substantially in
the form of Exhibit 10.04(c)-3 in respect of the Confidential Information, and
each Lender agrees to provide promptly to the Borrower an executed original of
each such confidentiality agreement entered into by its Prospective Assignee or
Prospective Participant, as the case may be, and such Person's Outside
Representative, if any.

                                       82
<PAGE>
 
          (d) The foregoing will not prohibit the disclosure of any Confidential
Information by the Agent, any Co-Agent, the Issuer or any Lender if and to the
extent that (i) such disclosure may be required by any Governmental Authority
having regulatory authority over it, or (ii) it or any of its Representatives
may become legally compelled by court order, subpoena or summons, or by
deposition, interrogatory, request for documents or otherwise in connection with
Litigation, or by similar legal process, including, without limitation, a civil
investigative demand having the same force and effect as a subpoena. However, in
any event described in clause (ii) above, the Agent, each Co-Agent, the Issuer
and each Lender each agrees that it or its Representatives, as the case may be,
prior to such disclosure will endeavor in good faith (except to the extent
prohibited by any Governmental Requirement from doing so) to provide the
Borrower with prompt notice of such request so that the Borrower may seek an
appropriate protective order or other appropriate remedy or waive compliance
with the provisions of this Section 10.04(d). In the event that such protective
order or other remedy is not obtained, or that the Borrower grants such a waiver
hereunder, the Agent, each Co-Agent, the Issuer and each Lender or its
Representatives, as the case may be, will in all events endeavor in good faith
to obtain reliable assurance that confidential treatment will be accorded any
Confidential Information so furnished.

          (e) The Agent, each Co-Agent, the Issuer and each Lender will only be
responsible for any breach of this Agreement by it or its Representatives, other
than its Outside Representatives who have executed and delivered a written
confidentiality agreement in accordance with this Section 10.04.

          (f) No failure or delay by the Borrower in exercising any right, power
or privilege under this Section 10.04 shall operate as a waiver thereof, nor
shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right, power or privilege under
this Section 10.04.

          Section 10.05  Amendments; Waivers.  Except as otherwise provided in
Section 2.01(c) with respect to increases in the Total Commitment and the
addition of Eligible Assignees as Lenders under the circumstances described
therein, any term, covenant, agreement or condition of this Agreement or the
Notes may be amended, and any right thereunder may be waived, if, but only if,
such amendment or waiver is in writing and is signed by the Required Lenders
and, if the rights and duties of the Agent, any Co-Agent or the Issuer are
affected thereby, by the Agent, such Co-Agent or the Issuer, as the case may be,
and by the Borrower; provided, however, that no such amendment or waiver shall
be effective, unless in writing and signed by each Lender affected thereby, to
the extent it (a) changes the several nature or the amount (except pursuant to
Section 2.01(b), 2.01(c) or 2.04) or extends the term (except pursuant to
Section 2.01(b)) of such Lender's Commitment, (b) reduces the principal of or
the rate of interest on the Loans, Reimbursement Obligations or Notes, the
amount of such Lender's participation in any Letter of Credit or any fees
payable pursuant to any Loan Document, (c) postpones any date fixed for, or
reduces the amount of, any mandatory payment or prepayment of principal of or
interest on the Loans, Notes, Reimbursement Obligations, or participations in
Letters 

                                       83
<PAGE>
 
of Credit or any fees payable pursuant to any Loan Document, (d) waives
any condition precedent to the initial Loans or Letters of Credit, (e) waives
the payment of any amounts payable to any Lender pursuant to Section 3.04, 3.05
or 3.06 or (f) waives or amends Section 8.06, this Section 10.05 or Section
10.12.  Unless otherwise specified in such waiver, a waiver of any right under
any Loan Document shall be effective only in the specific instance and for the
specific purpose for which it is given.  No election not to exercise, failure to
exercise or delay in exercising any right, nor any course of dealing or
performance, shall operate as a waiver of any right of the Agent, any Co-Agent,
the Issuer or any Lender under the Loan Documents or Governmental Requirements,
nor shall any single or partial exercise of any such right preclude any other or
further exercise thereof or the exercise of any other right of the Agent, any 
Co-Agent, the Issuer or any Lender under the Loan Documents or Governmental
Requirements.

          Section 10.06  Assignments and Participations. (a) Assignments.  Each
Lender may from time to time, in accordance with applicable Governmental
Requirements, assign any or all of its rights and obligations under the Loan
Documents to one or more Eligible Assignees; provided, however, that no such
assignment shall be effective unless and until:  (i) the Borrower, the Agent and
the Issuer shall have given their written consent to such assignment (which
consent shall not be unreasonably withheld); and (ii) the parties to each such
assignment shall have executed and delivered to the Agent an Assignment
Agreement together (except with respect to an assignment pursuant to Section
2.01(b)) with an assignment fee of $3,000 payable to the Agent.  Upon acceptance
and recording pursuant to Section 10.06(c), from and after the effective date
specified in each Assignment Agreement, (i) the assignee thereunder shall be a
party hereto and, to the extent of the interest assigned by such Assignment
Agreement, have the rights and obligations of a Lender under this Agreement and
(ii) the assigning Lender thereunder shall, to the extent of the interest
assigned by such Assignment Agreement, be released from its obligations under
this Agreement (and, in the case of an Assignment Agreement covering all or the
remaining portion of an assigning Lender's rights and obligations under this
Agreement, such Lender shall cease to be a party hereto, but shall continue to
be entitled to the benefits of Sections 3.04, 3.05, 3.06 and 10.02, as well as
to amounts accrued for its account pursuant to Section 2.05 or any other Loan
Document and not yet paid).

          (b) Maintenance of Register.  The Agent shall maintain at one of its
offices in The City of New York a copy of each Assignment Agreement delivered to
it and a register for the recordation of the names and addresses of the Lenders
(including those becoming Lenders pursuant to an Assignment Agreement or a
Supplement to Credit Agreement), and the Commitments of, principal amount of the
Loans owing to and Letter of Credit Obligations of, each Lender pursuant to the
terms hereof from time to time (the "Register").  The entries in the Register
shall be conclusive and the Borrower, the Agent, the Co-Agents, the Issuer and
the Lenders may treat each Person whose name is recorded in the Register
pursuant to the terms hereof as a Lender hereunder for all purposes of this
Agreement, notwithstanding notice to the contrary.  The Register shall be
available for

                                       84
<PAGE>
 
inspection by the Borrower, the Issuer and any Lender, at any reasonable time
and from time to time upon reasonable prior notice.

          (c) Acceptance and Recordation of Assignments.  On its receipt of a
duly completed Assignment Agreement executed by an assigning Lender and an
assignee, the assignment fee referred to in Section 10.06(a) above (unless not
required) and the written consent of the Borrower, the Agent and the Issuer to
such assignment, the Agent shall (i) accept such Assignment Agreement, (ii)
record the information contained therein in the Register and (iii) give prompt
notice thereof to the Lenders and the Issuer. No assignment shall be effective
unless it has been recorded in the Register as provided in this Section
10.06(c). On acceptance and recording pursuant to this Section 10.06(c) of any
such assignment by a Lender, the Borrower shall, against receipt of the existing
Note of the assignor Lender, issue a new Note to the assignee Lender and, in the
case of a partial assignment, to the assignor Lender, appropriately reflecting
such assignment.

          (d) Assignments to Federal Reserve Banks.  Nothing in this Section
10.06 shall limit the right of any Lender to assign its interest in its Loans
and Note to a Federal Reserve Bank as collateral security under Regulation A of
the Board of Governors of the Federal Reserve System, but no such assignment
shall release such Lender from its obligations hereunder.

          (e) Participations.  Subject to Sections 10.04 and 10.06(f), each
Lender may from time to time, in accordance with applicable Governmental
Requirements, sell or otherwise grant participations in any or all of its rights
and obligations under the Loan Documents without the consent of the Borrower,
the Agent, any Co-Agent, the Issuer or any other Lender; provided, however, that
no Lender shall, without the written consent of the Borrower (which shall not be
unreasonably withheld), sell any such participation, or permit the resale or
transfer of any such participation, to any Person other than a bank.  No sale by
a Lender of any participation shall relieve such Lender of any of its
obligations hereunder.

          (f) Rights of Participants.  Each participation agreement shall
provide that the Lender that has sold or granted the participation shall retain
the sole right to take or refrain from taking any action under the Loan
Documents, except that such participation agreement may provide that such Lender
shall not, without the consent of the participant, agree to any amendment or
waiver that would have the effect of (i) increasing the Commitment of such
Lender, (ii) extending the Termination Date of such Lender, (iii) reducing the
principal on the Loans, to the extent that the participant would be affected
thereby, (iv) reducing the rate of interest on the Loans or Notes, to the extent
that the participant would be affected thereby or (v) reducing the amount of
such Lender's participation in any fees payable pursuant to Section 2.05, to the
extent that the participant would be affected thereby.  All amounts payable to
any Lender under Section 3.04, 3.05 or Section 3.06 shall be determined as if
such Lender has not sold any participations.

                                       85
<PAGE>
 
          (g) Lender Representation.  Each Lender party to this Agreement on the
Closing Date hereby represents, and each Person that becomes a Lender pursuant
to an Assignment Agreement or a Supplement to Credit Agreement will represent,
and shall be deemed to have represented on becoming a party to this Agreement,
that it is in fact, otherwise than by reason of being a Lender, an Eligible
Assignee and will make or acquire Loans hereunder for its own account in the
ordinary course of its business.

          Section 10.07  Governing Law.  This Agreement and the Notes shall be
governed by and construed in accordance with the law of the State of New York
(without giving effect to its choice of law principles).  Each Letter of Credit
shall be governed by and construed in accordance with the laws or rules
designated in the applicable Letter of Credit Reimbursement Agreement.


          Section 10.08  Judicial Proceedings; WAIVER OF JURY TRIAL.  Any
judicial proceeding brought against the Borrower with respect to, or any dispute
under or arising out of or in connection with, any Loan Document Claim may be
brought in any court of competent jurisdiction in the Borough of Manhattan in
The City of New York, County of New York, and, by execution and delivery of this
Agreement, the Borrower (a) accepts, generally and unconditionally, the
nonexclusive jurisdiction of each such court and any related appellate court and
irrevocably agrees to be bound by any judgment rendered thereby in connection
with any Loan Document Claim and (b) to the fullest extent it may legally and
effectively do so, irrevocably waives any objection, including, without
limitation, any objection to the laying of venue or based on the grounds of
forum non conveniens, it may now or hereafter have to the bringing of any such
action or proceeding in such jurisdiction.  The Borrower shall appoint and
maintain CT Corporation System, The Prentice-Hall Corporation System Inc. or a
similar entity (the "Service Agent") as agent to receive on its behalf service
of process in any proceeding in a state or federal court located in the Borough
of Manhattan in The City of New York by entering into an agreement as of the
date of this Agreement with the Service Agent to such effect, and the Borrower
shall maintain such agreement (or an appropriate substitute to the same effect
with the same or a different Service Agent) for the entire term of this
Agreement.  The foregoing consent to jurisdiction and appointment of agent to
receive service of process shall not constitute a general consent to service of
process in the State of New York for any purpose except as provided above and
shall not be deemed to confer rights on any Person other than the Agent, any Co-
Agent, the Lenders and the Issuer.  Nothing herein shall affect the right of the
Agent, any Lender, any Co-Agent, the Issuer or any other Indemnified Person to
serve process in any other manner permitted by law or shall limit the right of
the Agent, any Co-Agent, any Lender, the Issuer or any other Indemnified Person
to bring proceedings against the Borrower in the courts of any other
jurisdiction.  In light of the express agreement of the Borrower to submit to
the jurisdiction of New York courts for the resolution of any and all disputes
arising under this Agreement and brought in New York courts pursuant to this
Section 10.08, the Borrower further hereby knowingly, voluntarily and
intentionally waives, to the fullest extent permitted by applicable law, any and
all affirmative defenses it could or might otherwise be able to assert based on
an alleged incapacity of the Borrower to

                                       86
<PAGE>
 
assert a claim or counter-claim in the state courts of the State of New York
located in the Borough of Manhattan whether on the grounds that the Borrower has
failed to comply with any or all registration, certification, notification,
filing or designation-of-agent Governmental Requirements of the State of New
York or on other grounds. THE BORROWER AND EACH OTHER PARTY HERETO EACH HEREBY
KNOWINGLY, VOLUNTARILY AND INTENTIONALLY, IRREVOCABLY AND UNCONDITIONALLY
WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE
TO A TRIAL BY JURY IN ANY JUDICIAL PROCEEDING INVOLVING ANY CLAIM ARISING OUT
OF, RELATING TO OR IN CONNECTION WITH ANY LOAN DOCUMENT CLAIM. THE BORROWER AND
EACH OTHER PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY
OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER
PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING
WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN
INDUCED TO ENTER INTO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS
APPLICABLE, BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN
THIS SECTION 10.08.The provisions of this Section 10.08 shall survive the
termination of this Agreement and the payment in full of the Obligations.

          Section 10.09  Severability of Provisions.  In case any provision of
the Loan Documents is invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

          Section 10.10  Counterparts; Integration; Binding Effect.  This
Agreement may be executed in any number of counterparts and by different parties
hereto in separate counterparts, each when so executed shall be deemed to be an
original and all of which taken together shall constitute one and the same
agreement.  This Agreement shall become effective when it shall have been
executed by the Borrower, the Issuer and the Agent and when the Agent shall have
received an original signature page signed by, or a facsimile copy of an
original signature page signed by, each Co-Agent and Lender listed on the
signature pages hereof.

          Section 10.11  Entire Agreement.  This Agreement, the Notes and the
other Loan Documents embody the entire agreement among the Borrower, the Agent,
the Co-Agents, the Issuer and the Lenders relating to the subject matter hereof
and supersede all prior agreements and understandings, oral or written, relating
to the subject matter hereof.

          Section 10.12  Successors and Assigns.  The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns in accordance with the terms hereof,
except that the Borrower may not assign or transfer any of its rights or
obligations under this Agreement without the prior written consent of all
Lenders.

                                       87
<PAGE>
 
          IN WITNESS WHEREOF,  the parties hereto have caused this Agreement to
be executed and delivered by their duly authorized officers all as of May 8,
1995.



                             LYONDELL-CITGO REFINING COMPANY LTD.



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE BANK OF NEW YORK,
                              as Agent, as Issuer and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE BANK OF NOVA SCOTIA
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             CREDIT LYONNAIS
                              as Co-Agent



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       88
<PAGE>
 
                             THE FIRST NATIONAL BANK OF CHICAGO
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE INDUSTRIAL BANK OF JAPAN, LTD.
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             OTHER LENDERS:

                             ABN AMRO BANK N.V.
 


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             ABN AMRO BANK N.V.
 


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       89
<PAGE>
 
                             BANQUE NATIONALE DE PARIS,
                                HOUSTON AGENCY



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             CAISSE NATIONALE DE CREDIT AGRICOLE



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:



                             CREDIT LYONNAIS CAYMAN ISLAND BRANCH
                              as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             NATIONSBANK OF TEXAS, N.A.



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       90
<PAGE>
 
                             NBD BANK



                             By:  [Signataure Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE NIPPON CREDIT BANK, LTD.
                                NEW YORK BRANCH



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             PNC BANK, NATIONAL ASSOCIATION



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             ROYAL BANK OF CANADA



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             SOCIETE GENERALE, SOUTHWEST AGENCY



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       91
<PAGE>
 
                             WESTDEUTSCHE LANDESBANK GIROZENTRALE,
                                NEW YORK AND CAYMAN
                                ISLANDS BRANCHES



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE YASUDA TRUST AND BANKING COMPANY, LTD.
                                NEW YORK BRANCH



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       92

<PAGE>
 
================================================================================
                                                                  Exhibit 4.4(b)

                                 $450,000,000

                                CREDIT AGREEMENT

                            DATED AS OF MAY 5, 1995


                                     AMONG


                     LYONDELL-CITGO REFINING COMPANY LTD.,


                            THE LENDERS FROM TIME TO
                              TIME PARTIES HERETO,

                            THE BANK OF NOVA SCOTIA,
                                CREDIT LYONNAIS,
                       THE FIRST NATIONAL BANK OF CHICAGO
                                      AND
                      THE INDUSTRIAL BANK OF JAPAN, LTD.,

                                 AS CO-AGENTS

                                      AND

                             THE BANK OF NEW YORK,

                                   AS AGENT


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

<TABLE>
 
<S>        <C>                                                              <C>
ARTICLE I.        DEFINITIONS.............................................   1
           Section 1.01  Certain Defined Terms............................   1
           Section 1.02  Other Definitional Provisions....................  23
           Section 1.03  Captions.........................................  24
 
ARTICLE II.       CREDIT FACILITY.........................................  24
           Section 2.01  The Facility.....................................  24
           Section 2.02  Making the Loans.................................  24
           Section 2.03  Reduction of Commitments.........................  25
           Section 2.04  Fees.............................................  25
           Section 2.05  Interest.........................................  25
           Section 2.06  Voluntary Interest Rate Conversion...............  28
 
ARTICLE III.      PAYMENTS, PREPAYMENTS, INCREASED COSTS
                  AND TAXES...............................................  28
           Section 3.01  Payments and Computations........................  28
           Section 3.02  Mandatory Prepayments............................  29
           Section 3.03  Voluntary Prepayments............................  30
           Section 3.04  Funding Losses Relating to Eurodollar Rate Loans.  30
           Section 3.05  Increased Costs; Capital Adequacy................  31
           Section 3.06  Taxes............................................  32
           Section 3.07  Substitution of Lender...........................  34

ARTICLE IV.       CONDITIONS TO LOANS; CONVERSIONS........................  35
           Section 4.01  Conditions to Initial Loans......................  35
           Section 4.02  Conditions to Each Borrowing.....................  36
           Section 4.03  Conditions to Certain Loans......................  37
           Section 4.04  Conditions to Conversions........................  37
           Section 4.05  Deemed Fulfilled Conditions......................  38

ARTICLE V.        REPRESENTATIONS AND WARRANTIES OF
                  THE BORROWER............................................  38
           Section 5.01  Organization; Power; Qualification...............  38
           Section 5.02  Authorization; Enforceability; Absence of 
                         Conflicts; Required Consents.....................  39
           Section 5.03  Compliance With Laws.............................  39
           Section 5.04  No Defaults......................................  40
           Section 5.05  Litigation.......................................  40
           Section 5.06  Financial Statements; Disclosure.................  40
           Section 5.07  Taxes............................................  41
           Section 5.08  Government Regulation............................  41
           Section 5.09  Employee Benefit Plans...........................  41

</TABLE>

                                       i
<PAGE>
 
<TABLE>

<S>        <C>                                                              <C>
           Section 5.10  Title to Property; Leases........................  42
           Section 5.11  Labor Matters....................................  43
           Section 5.12  Intellectual Property............................  43
           Section 5.13  Use of Proceeds..................................  43

ARTICLE VI.       FINANCIAL STATEMENTS AND INFORMATION....................  43
           Section 6.01  Reporting Requirements...........................  44
           Section 6.02  Books and Records................................  46
           Section 6.03  Visits, Inspections and Discussions..............  46

ARTICLE VII.      CERTAIN COVENANTS.......................................  47
           Section 7.01  Maintenance of Existence and Properties..........  47
           Section 7.02  Compliance With Governmental Requirements........  48
           Section 7.03  Payment of Taxes and Claims......................  48
           Section 7.04  Insurance; Casualty..............................  48
           Section 7.05  Liens............................................  49
           Section 7.06  Restricted Payments..............................  49
           Section 7.07  Limitations on Mergers, Etc......................  50
           Section 7.08  Disposition of Assets............................  50
           Section 7.09  Indebtedness.....................................  50
           Section 7.10  Transactions With Affiliates.....................  51
           Section 7.11  Limitation on Restrictive Covenants..............  51
           Section 7.12  Issuance or Disposition of Capital Securities....  51
           Section 7.13  Investments......................................  52
           Section 7.14  Business.........................................  52
           Section 7.15  Fiscal Year......................................  52
           Section 7.16  Financial Covenants..............................  52
           Section 7.17  Certain Material Agreements......................  53
           Section 7.18  Use of Proceeds..................................  54

ARTICLE VIII.     DEFAULT.................................................  54
           Section 8.01  Events of Default................................  54
           Section 8.02  Remedies.........................................  58
           Section 8.03  Application of Proceeds..........................  59
           Section 8.04  Set-Off; Suspension of Payment and Performance...  59
           Section 8.05  Sharing of Recoveries............................  60

ARTICLE IX.       THE AGENT...............................................  60
           Section 9.01  Appointment and Powers...........................  60
           Section 9.02  Limitation on Agent's Liability..................  61
           Section 9.03  Defaults.........................................  61
           Section 9.04  Rights as a Lender...............................  61
           Section 9.05  Indemnification..................................  62
           Section 9.06  Non-Reliance on Agent and Other Lenders..........  62

</TABLE>

                                      ii
<PAGE>
 
<TABLE>

<S>        <C>                                                               <C>
           Section 9.07  Resignation of the Agent..........................  62
           Section 9.08  CERTAIN INTENTIONS................................  63

ARTICLE X.        MISCELLANEOUS............................................  63
           Section 10.01  Notices and Deliveries...........................  63
           Section 10.02  Expenses; Indemnification........................  65
           Section 10.03  Rights Cumulative................................  67
           Section 10.04  Confidentiality..................................  67
           Section 10.05  Amendments; Waivers..............................  69
           Section 10.06  Assignments and Participations...................  69
           Section 10.07  Governing Law....................................  71
           Section 10.08  Judicial Proceedings; WAIVER OF JURY TRIAL.......  71
           Section 10.09  Severability of Provisions.......................  72
           Section 10.10  Counterparts; Integration; Binding Effect........  72
           Section 10.11  Entire Agreement.................................  72
           Section 10.12  Successors and Assigns...........................  73

</TABLE> 
 
ANNEXES, SCHEDULES AND EXHIBITS
 
Annex A       -      Lender Information
Schedule A    -      ERISA Assumptions
Exhibit A     -      Form of Note
Exhibit 2.02  -      Form of Notice of Borrowing
Exhibit 2.06  -      Form of Notice of Conversion
Exhibit 4.01(b)-1 -  Form of Secretary's Certificate
Exhibit 4.01(b)-2 -  Form of Amendment to the Regulations
Exhibit 4.01(f)-1 -  Form of Opinion of Counsel to Borrower
Exhibit 4.01(f)-2 -  Form of Opinion of Counsel to Borrower
Exhibit 4.01(g) -    Form of Officer's Certificate
Exhibit 6.01(a) -    Form of Quarterly Compliance Certificate
Exhibit 6.01(b) -    Form of Annual Compliance Certificate
Exhibit 10.04(c)-1 - Form of Assignee Confidentiality Agreement
Exhibit 10.04(c)-2 - Form of Participant Confidentiality Agreement
Exhibit 10.04(c)-3 - Form of Outside Representative Confidentiality Agreement
Exhibit 10.06(a) -   Form of Assignment Agreement

                                      iii
<PAGE>
 
                                CREDIT AGREEMENT


                            dated as of May 5, 1995


          LYONDELL-CITGO REFINING COMPANY LTD., a Texas limited liability
company, the LENDERS listed on the signature pages hereof and any Lender
hereafter becoming a party hereto in accordance with the provisions hereof, THE
BANK OF NOVA SCOTIA, CREDIT LYONNAIS, THE FIRST NATIONAL BANK OF CHICAGO and THE
INDUSTRIAL BANK OF JAPAN, LTD., as Co-Agents, and THE BANK OF NEW YORK, as
Agent, agree as follows:

                                   ARTICLE I.

                                  DEFINITIONS

          Section 1.01  Certain Defined Terms.  As used in this Credit
Agreement, the following terms have the meanings assigned to them below:

          "Accumulated Funding Deficiency" has the meaning specified in Section
     302 of ERISA.

          "Adjusted Eurodollar Rate" means, for any day in an Interest Period
     for any Eurodollar Loan, an interest rate per annum equal to the sum of (a)
     the quotient, expressed as a percentage, resulting from the division of (i)
     the Eurodollar Rate for such Interest Period by (ii) the percentage equal
     to 100% minus the Eurodollar Rate Reserve Percentage in effect on such day,
     plus (b) the Applicable Margin in effect on such day.

          "Affiliate" means, as to any Person, any other Person that, directly
     or indirectly through one or more intermediaries or otherwise, controls, is
     controlled by, or is under common control with, such Person.  As used in
     this definition, "control" means the possession, directly or indirectly, of
     the power to direct or cause the direction of the management or policies of
     a Person (whether through ownership of securities or limited liability
     company, partnership or other ownership interests, by contract or
     otherwise).  At the date of this Agreement, each of LRC and CRIC controls
     and is an Affiliate of the Borrower.

          "Affiliate Indebtedness" means, as to any Person, Indebtedness of such
     Person which is owed to any Affiliate of such Person.

          "Agent" means The Bank of New York, in its capacity as agent for the
     Lenders pursuant to this Agreement, and any successor Agent appointed
     pursuant to Section 9.07.
<PAGE>
 
          "Agent's Office" means the address of the Agent specified in or
     determined in accordance with the provisions of Section 10.01.

          "Agreement" means this Agreement, including all attached Schedules,
     Annexes and Exhibits, each as amended, modified and supplemented from time
     to time.

          "Applicable Debt Percentage Ratio" means (a) as of any Determination
     Date as defined in clause (a) of the definition thereof, the ratio of (i)
     Consolidated Indebtedness as of the end of the Borrower's most recently
     ended fiscal quarter to (ii) Consolidated EBITDA for the Borrower's four
     most recently ended fiscal quarters, and (b) as of any other Determination
     Date, 3.00 to 1.00.

          "Applicable Margin" means (a) for the period from the Closing Date
     until the first Determination Date after the Closing Date, 0.550% per
     annum, and (b) for any subsequent period from and including any
     Determination Date, beginning with the first Determination Date after the
     date of this Agreement, to the next Determination Date to occur, if the
     Applicable Debt 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 column B below (if such first day
     occurs during the Pre-Completion Period) or column C below (if such first
     day occurs during the Post-Completion Period):

<TABLE>
<CAPTION>
 
                     A                          B       C
                -----------                   ------  ------
<S>                                           <C>     <C>
less than 1.00 to 1.00                        0.550%  0.450%
less than 2.00 to 1.00 but 1.00 to 1.00 or
more                                          0.600%  0.500%
less than 3.00 to 1.00 but 2.00 to 1.00 or
more                                          0.650%  0.550%
3.00 to 1.00 or more                          0.725%  0.625%
 
</TABLE>


          "Approved Costs" means the costs incurred by the Borrower in
     connection with the Refinery Expansion Project pursuant to and in
     accordance with the Refinery Expansion Budget and Recommended Design.

          "Assignment Agreement" means any agreement substantially in the form
     of Exhibit 10.06(a) with respect to an assignment in accordance with
     Section 10.06.

          "Average Consolidated Indebtedness" means, as of the date of any
     determination, without duplication of amounts, the average of the aggregate
     amounts outstanding at the 

                                       2
<PAGE>
 
     end of each month during the Borrower's four most recently ended fiscal
     quarters of all obligations (other than obligations in respect of Interest
     Rate Protection Agreements) of the Borrower and the Subsidiaries in respect
     of the principal amount of all Indebtedness, including, without limitation,
     the Loans, the Revolving Credit Loans, the Revolving Credit Agreement
     Letter of Credit Obligations, all Qualified Subordinated Debt, all
     Permitted Replacement Debt and all Distribution Debt.

          "Average Debt to EBITDA Ratio" means, as of the date of any
     determination, the ratio of (a) Average Consolidated Indebtedness over the
     Borrower's four most recently ended fiscal quarters to (b) Consolidated
     EBITDA for such fiscal quarters.

          "Bankruptcy Law" means Title 11 of the United States Code or any other
     federal or state law, or any foreign law, relating to bankruptcy,
     insolvency, reorganization, relief or protection of debtors.

          "Base Rate" means, for any day, a rate per annum equal to the higher
     of (a) the Prime Rate in effect on such day and (b) the sum of 0.5%, plus
     the Federal Funds Rate in effect on such day.

          "Base Rate Loan" means any Loan that bears interest computed on the
     basis of the Base Rate.

          "Benefit Plan" means, with respect to any Person at any time, any
     "employee pension benefit plan" as defined in Section 3(2) of ERISA,
     including any plan that is covered by Title IV of ERISA or subject to the
     minimum funding standards under Section 412 of the Code (excluding any
     Multiemployer Benefit Plan), the funding requirements of which (under
     Section 302 of ERISA or Section 412 of the Code) are, or at any time within
     six years preceding the time in question were, in whole or in part, the
     responsibility of such Person or with respect to which such Person or an
     ERISA Affiliate of such Person was a "contributing sponsor" or an
     "employer" as defined in Section 4001 and Section 3(5), respectively, of
     ERISA.

          "Birmingport Facility" has the meaning assigned to such term in the
     Contribution Agreement as in effect on the date of this Agreement.

          "Borrower" means LYONDELL-CITGO Refining Company Ltd., a Texas limited
     liability company.

          "Borrowing" means one or more borrowings by the Borrower on the same
     day under and pursuant to this Agreement, each of which consists of Loans
     of the same Type by the Lenders.

          "Business Day" means a day of the year on which banks are not
     authorized or required to be closed in New York City and, if the applicable
     Business Day relates to any 

                                       3
<PAGE>
 
     Eurodollar Rate Loans, on which dealings are carried on between prime banks
     in the London interbank market.

          "Capital Lease" means a lease of (or other agreement conveying the
     right to use) real or personal property that is required to be classified
     and accounted for as a capital lease under GAAP as in effect on the date of
     this Agreement, and, for purposes of this Agreement, the amount of any
     Capital Lease obligation at any date shall be the capitalized amount
     thereof at such date as determined in accordance with GAAP as in effect on
     the date of this Agreement.

          "Capital Security" means (a) any share, membership or other percentage
     interest, unit of participation or other equivalent (however designated) of
     a corporate equity security or other equity interest in a Person and (b)
     any debt security or other evidence of Indebtedness which is convertible
     into or exchangeable for, or any option, warrant or other right to acquire,
     any Capital Security of any type referred to in clause (a) of this
     definition.

          "Change of Control" means (a) prior to the In-Service Date, the
     failure of CITGO or Lyondell, individually or collectively, to own, legally
     and beneficially, directly or indirectly, 100% of the outstanding ownership
     and voting interests in the Borrower, and (b) after the In-Service Date,
     the failure of CITGO or Lyondell, individually or collectively, to own,
     legally and beneficially, directly or indirectly, at least 35% of the
     outstanding ownership and voting interests in the Borrower.

          "Charter Documents" means, with respect to (a) the Borrower, (i) its
     Articles of Organization and (ii) the Regulations, and (b) with respect to
     any other Person, (i) the articles or certificate of formation,
     incorporation or organization (or the equivalent organizational documents)
     of such Person, (ii) the bylaws, limited liability company agreement or
     regulations (or the equivalent governing documents) of such Person and
     (iii) each document setting forth the designation, amount and relative
     rights, limitations and preferences of any class or series of such Person's
     Capital Securities or of any rights in respect of such Person's Capital
     Securities.

          "CITGO" means CITGO Petroleum Corporation, a Delaware corporation.

          "Closing Date" means the date as of which this Agreement is deemed to
     have been executed and delivered by the Borrower, the Agent, each Co-Agent
     and each Lender named on the signature pages hereof, as set forth in the
     paragraph preceding the Borrower's signature hereon.

          "Co-Agents" means The Bank of Nova Scotia, Credit Lyonnais, The First
     National Bank of Chicago and The Industrial Bank of Japan, Ltd., in their
     respective capacities as Co-Agents for the Lenders pursuant to this
     Agreement.

                                       4
<PAGE>
 
          "Code" means the Internal Revenue Code of 1986.

          "Commitment" means, with respect to each Lender, the amount set forth
     opposite such Lender's name under the heading "Commitment" on Annex A or,
     in the case of a Lender that becomes a Lender pursuant to an assignment,
     the amount set forth in the applicable Assignment Agreement, in either case
     as the same may be reduced from time to time pursuant to Section 2.03, 3.02
     or 3.03 or increased or reduced from time to time pursuant to assignments
     in accordance with Section 10.06.

          "Confidential Information" has the meaning specified in Section 10.04.

          "Consolidated EBIT" means, for any period, without duplication of
     amounts, the sum of (a) Net Income for such period, plus (b)(i) such amount
     of Consolidated Interest Expense for such period as was deducted in
     determining such Net Income and (ii) the amount classified as income tax
     expense and deducted in determining such Net Income.

          "Consolidated EBITDA" means, for any period, without duplication of
     amounts, the sum of (a) Consolidated EBIT for such period, plus (b) the
     amount classified as depreciation and amortization expense and deducted in
     determining Net Income for such period.

          "Consolidated Indebtedness" means, as of the date of any
     determination, without duplication of amounts, the aggregate amount of all
     obligations (other than obligations in respect of Interest Rate Protection
     Agreements) of the Borrower and the Subsidiaries in respect of the
     principal amount of all Indebtedness, including, without limitation, the
     Loans, the Revolving Credit Loans, the Revolving Credit Agreement Letter of
     Credit Obligations, all Qualified Subordinated Debt, all Permitted
     Replacement Debt and all Distribution Debt as of such date.

          "Consolidated Interest Expense" means, for any period, without
     duplication of amounts, the sum of (a) the amount classified as interest
     costs and deducted in determining Net Income for such period, plus (b) the
     interest costs of the Borrower and the Subsidiaries on a consolidated basis
     and capitalized in accordance with GAAP for such period and not deducted in
     determining Net Income for such period.

          "Consolidated Net Worth" means, as of the date of any determination,
     without duplication of amounts, (i) the aggregate amount of total assets of
     the Borrower and the Subsidiaries, minus (ii) the aggregate amount of the
     total liabilities of the Borrower and the Subsidiaries, in each case as of
     the end of the Borrower's most recently ended fiscal quarter and determined
     on a consolidated basis in accordance with GAAP as in effect on
     the date of this Agreement and as applied on a basis consistent with the
     basis on which GAAP was applied in the preparation of the Initial Financial
     Statements.  Without limiting the generality of the foregoing, the
     liabilities of the Borrower at any time shall include the amount of all
     Distribution Debt and accrued, unpaid interest thereon at such time.

                                       5
<PAGE>
 
          "Contribution Agreement" means the Contribution Agreement, dated July
     1, 1993, between Lyondell and the Borrower, as amended, modified and
     supplemented from time to time to the extent permitted by Section 7.17,
     unless the context otherwise requires.

          "Convert," "Conversion" or "Converted" each refers to a conversion of
     Loans of one Type into Loans of another Type and includes the continuation
     of Eurodollar Rate Loans as Eurodollar Rate Loans having a new Interest
     Period.

          "Coverage Ratio" means, as of the date of any determination, the ratio
     of (a) Consolidated EBIT for the Borrower's four most recently ended fiscal
     quarters to (b) Consolidated Interest Expense for such fiscal quarters.

          "CRIC" means Citgo Refining Investment Company, an Oklahoma
     corporation.

          "Crude Supply Agreement" means the Crude Supply Agreement, dated as of
     May 5, 1993, between the Borrower and Lagoven, S.A., a corporation
     organized under the laws of the Republic of Venezuela, as amended, modified
     and supplemented from time to time to the extent permitted by Section 7.17,
     unless the context otherwise requires.

          "Current Date" means any day during the 20-day period ending on the
     Closing Date.

          "Custodian" means any custodian, receiver, sequestrator, trustee or
     similar official (a) under any Bankruptcy Law, (b) under any business
     corporation statute in the case of assets of any corporation or (c) under
     or pursuant to any limited liability company statute in the case of assets
     of any limited liability company.

          "Debt to Total Capitalization Ratio" means, as of the end of any
     fiscal quarter of the Borrower, the ratio of (a) Consolidated Indebtedness
     to (b) the sum of (i) Consolidated Net Worth, plus (ii) Consolidated
     Indebtedness, in each case as of such time.

          "Default" means any condition or event that constitutes an Event of
     Default or that with the giving of notice or lapse of time or both would
     become an Event of Default.

          "Default Rate" means the rate otherwise applicable under Section
     2.05(a)(i) or (ii), plus 2.0% or, if there is no such applicable rate in
     respect of the circumstances for which the Default Rate is used, the Base
     Rate, plus 2.0%.

          "Determination Date" means, for purposes of determining the Applicable
     Margin from time to time, (a) the first date after the end of a fiscal
     quarter of the Borrower on which the Agent receives the Financial
     Statements as of the end of such fiscal quarter and the related compliance
     certificate required by Section 6.01(a) or 6.01(b), as the case may be, to
     be delivered to the Agent by reason of such fiscal quarter having ended,
     (b) the 60th day after the end of any fiscal quarter of the Borrower if the
     Agent has not 

                                       6
<PAGE>
 
     theretofore received the Financial Statements and the related compliance
     certificate required to be furnished to the Agent by Section 6.01(a) by
     reason of such fiscal quarter having ended and (c) the 120th day after the
     end of any last fiscal quarter of any fiscal year of the Borrower if the
     Agent has not theretofore received the Financial Statements and the related
     audit report and compliance certificate required by Section 6.01(b) to be
     furnished to the Agent by reason of such fiscal quarter having ended.

          "Distribution Debt" means obligations of the Borrower created under
     Section 7.3.(C) of the Regulations to any Owner in respect of distributions
     required to be made pursuant to Section 7.4 or 7.5 of the Regulations
     (other than an amount described in Section 7.4.(B) of the Regulations).

          "Dollars" and the sign "$" each means lawful money of the United
     States of America.

          "Domestic Lending Office" means, with respect to each Lender, (a) the
     branch or office of such Lender set forth below such Lender's name under
     the heading "Domestic Lending Office" on Annex A or, in the case of a
     Lender that becomes a Lender pursuant to an assignment, the branch or
     office of such Lender set forth under the heading "Domestic Lending Office"
     in the Assignment Agreement giving effect to such assignment, or (b) such
     other branch or office of such Lender designated by such Lender to the
     Agent and the Borrower from time to time as the branch or office at which
     its Base Rate Loans are to be made or maintained.

          "Eligible Assignee" means at any time any Lender, bank, finance
     company, insurance company, savings and loan association, savings bank,
     other financial institution or fund that (a) is regularly engaged in making
     or purchasing loans or (b) if not regularly engaged in making commercial
     loans, is a "qualified institutional buyer" or an "accredited investor" (as
     defined in Rule 144A and Regulation D, respectively, under the Securities
     Act of 1933).

          "Environmental Laws" means any and all Governmental Requirements
     relating to the environment, including, without limitation, ambient air,
     surface water, land surface or subsurface strata, or to emissions,
     discharges, releases or threatened releases of pollutants, contaminants,
     chemicals or industrial, toxic or hazardous substances or wastes or noxious
     noise or odor into the environment, or otherwise relating to the
     manufacture, processing, distribution, use, treatment, storage, disposal,
     transport or handling of pollutants, contaminants, chemicals or industrial,
     toxic or hazardous substances or wastes (including, without limitation,
     petroleum, petroleum distillates, asbestos or asbestos-containing material
     or polychlorinated biphenyls).

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

                                       7
<PAGE>
 
          "ERISA Affiliate" means, with respect to any Person, any other Person,
     including an Affiliate of such first Person, that is a member or at any
     time within six years of the time in question has been a member of any
     group of organizations within the meaning of Section 414(b), (c), (m) or
     (o) of the Code of which such first Person is or was a member.

          "Eurocurrency Liabilities" has the meaning specified in Regulation D
     of the Board of Governors of the Federal Reserve System.

          "Eurodollar Lending Office" means, with respect to each Lender, (a)
     the branch or office of such Lender set forth below such Lender's name
     under the heading "Eurodollar Lending Office" on Annex A or, in the case of
     a Lender that becomes a Lender pursuant to an assignment, the branch or
     office of such Lender set forth under the heading "Eurodollar Lending
     Office" in the Assignment Agreement giving effect to such assignment, or
     (b) such other branch or office of such Lender designated by such Lender to
     the Agent and the Borrower from time to time as the branch or office at
     which its Eurodollar Rate Loans are to be made or maintained.

          "Eurodollar Rate" means, for any Interest Period for each Eurodollar
     Rate Loan comprising part of the same Borrowing, the per annum rate
     determined by the Agent as follows: (a) the Agent shall obtain the rate for
     deposits in Dollars for a period comparable to such Interest Period which
     appears on the Telerate Page 3750 as of 11:00 A.M. (London time) two
     Business Days preceding the first day of such Interest Period; and (b) if
     the Agent is not able to obtain quotations for the determination of the
     Eurodollar Rate pursuant to clause (a) above, the Eurodollar Rate shall be
     the per annum rate of interest quoted by the Agent at which Dollar deposits
     are offered by the Agent to prime banks in the London interbank market at
     approximately 11:00 A.M. (London time) two Business Days prior to the first
     day of such Interest Period, which deposits are for a period equal to such
     Interest Period and in an amount substantially equal to the Eurodollar Rate
     Loan that the Agent would make in its capacity as a Lender.

          "Eurodollar Rate Loan" means any Loan that bears interest computed on
     the basis of the Adjusted Eurodollar Rate.

          "Eurodollar Rate Reserve Percentage" means, for any day in an Interest
     Period for any Eurodollar Rate Loan, the reserve percentage applicable on
     that day under regulations issued from time to time by the Board of
     Governors of the Federal Reserve System (or any successor) for determining
     the maximum reserve requirement (including, without limitation, any
     emergency, supplemental or other marginal reserve requirement) for the
     Agent with respect to liabilities or assets consisting of or including
     Eurocurrency Liabilities having a term equal to such Interest Period.

          "Event of Default" has the meaning specified in Section 8.01.

                                       8
<PAGE>
 
          "Existing Credit Agreement" means the Credit Agreement, dated as of
     July 1, 1994, among the Borrower, the lenders that are parties thereto and
     Continental Bank N.A.

          "Federal Funds Rate" means, for each day, the rate per annum (rounded
     upwards if necessary, to the nearest 1/100th of 1%) 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, as
     published for such day (or, if such day is not a Business Day, for the next
     preceding Business Day) by the Federal Reserve Bank of New York or, if such
     rate is not so published for any day that is a Business Day, the average of
     the quotations for such day received by the Agent from three federal funds
     brokers of recognized standing selected by it.

          "Fee Letters" means (a) that certain letter from the Agent to the
     Borrower dated as of the date of this Agreement respecting commitment fees
     payable by the Borrower on the Closing Date to the Agent for the respective
     accounts of the Lenders and (b) that certain letter from The Bank of New
     York to the Borrower dated as of the date of this Agreement respecting
     certain fees payable by the Borrower to The Bank of New York on the Closing
     Date and from time to time in connection with this Agreement.

          "Financial Statements" means the Initial Financial Statements and the
     financial statements of the Borrower and the Subsidiaries required to be
     delivered to the Agent by Sections 6.01(a) and (b).

          "GAAP" means generally accepted accounting principles and practices in
     the United States as in effect from time to time and concurred in by the
     independent certified public accountants certifying the Financial
     Statements required by Section 6.01(b), applied on a basis consistent
     (except for changes concurred in by such independent certified public
     accountants) with the most recent audited Financial Statements delivered to
     the Agent, except as otherwise specifically provided herein.

          "Governmental Approval" means any authorization, consent, approval,
     permit, franchise, certificate, license, implementing order or exemption
     of, or registration or filing with, any Governmental Authority.

          "Governmental Authority" means (a) any national, state, county,
     municipal or other government, domestic or foreign, or any agency, board,
     bureau, commission, court, department or other instrumentality of any such
     government or (b) any school district having the authority to assess and
     collect Taxes.

          "Governmental Requirement" means any law, statute, code, ordinance,
     order, rule, regulation, judgment, decree, injunction, writ, edict, award,
     authorization or other requirement of any Governmental Authority or any
     obligation included in any certificate, franchise, permit or license issued
     by any Governmental Authority or resulting from binding arbitration,
     including, without limitation, any requirement under common law.

                                       9
<PAGE>
 
          "Gross Proceeds" means, with respect to any Permitted Replacement
     Debt, (a) if such Permitted Replacement Debt is incurred by the Borrower in
     a commercial or other loan transaction or to an Affiliate of the Borrower,
     the aggregate unpaid principal amount of such Permitted Replacement Debt
     when it is so incurred, or (b) if such Permitted Replacement Debt is
     evidenced by "securities" (as defined in the Securities Act of 1933) issued
     and sold by the Borrower to one or more underwriters for resale or one or
     more investors for investment, the aggregate gross proceeds received by the
     Borrower from such sale before the deduction of any expenses related to
     such sale, provided, that in the case of any sale to an underwriter for
     resale, if such underwriter's underwriting or similar discount or
     commission is not reflected as a reduction in the purchase price paid by
     such underwriter to the Borrower for such Permitted Replacement Debt from
     the price at which such underwriter initially offers such Permitted
     Replacement Debt for resale, it shall be deducted, without duplication of
     amounts, in determining the Gross Proceeds received by the Borrower from
     such Permitted Replacement Debt.

          "Guaranty" means, for any Person, without duplication, any liability,
     contingent or otherwise, of such Person guaranteeing or otherwise becoming
     liable for any obligation of any other Person (the "primary obligor") in
     any manner, whether directly or indirectly, and including, without
     limitation, any liability of such Person, direct or indirect, (a) to
     purchase or pay (or advance or supply funds for the purchase or payment of)
     such obligation or to purchase (or to advance or supply funds for the
     purchase of) any security for the payment of such obligation, (b) to
     purchase property, securities or services for the purpose of assuring the
     owner of such obligation of the payment of such obligation or (c) to
     maintain working capital, equity capital or other financial statement
     condition or liquidity of the primary obligor so as to enable the primary
     obligor to pay such obligation; provided, that the term "Guaranty" does not
     include endorsements for collection or deposit in the ordinary course of
     the endorser's business.

          "Houston Facility" has the meaning assigned to such term in the
     Contribution Agreement as in effect on the date of this Agreement.
 
          "Indebtedness" of any Person means, without duplication, (a) any
     liability of such Person (i) for borrowed money or arising out of any
     extension of credit to or for the
     account of such Person (including, without limitation, reimbursement or
     payment obligations with respect to surety bonds, letters of credit,
     banker's acceptances and similar instruments), for the deferred purchase
     price of property or services or arising under conditional sale or other
     title retention agreements, other than trade payables arising in the
     ordinary course of business, (ii) evidenced by notes, bonds, debentures or
     similar instruments, (iii) in respect of Capital Leases or (iv) in respect
     of Interest Rate Protection Agreements, (b) any liability secured by any
     Lien upon any property or assets of such Person (or upon any revenues,
     income or profits of such Person therefrom), whether or not such Person has
     assumed such liability or otherwise become liable for the payment thereof,
     (c) any liability of others of the type described in the preceding clause
     (a) or (b) 

                                       10
<PAGE>
 
     in respect of which such Person has incurred, assumed or
     acquired a liability by means of a Guaranty or (d) with respect to the
     Borrower, Distribution Debt.

          "Indemnified Person" means, at any time, any Person that is, or at
     such time was, the Agent, a Co-Agent, a Lender, an Affiliate of the Agent,
     a Co-Agent or a Lender or a director, officer, employee or agent of any
     such Person.

          "Information" means written information, including, without
     limitation, data, certificates, reports, statements (excluding Financial
     Statements) and documents.

          "Initial Financial Statements" means the audited balance sheet of the
     Borrower as at December 31, 1994 and the related statements of income and
     cash flows for the Borrower's fiscal year ended on such date, copies of
     which have been made available to each Lender identified on the signature
     pages hereof prior to the date of this Agreement.

          "Initial Refinery Expansion Project Contribution" means the cash
     contributions in an aggregate amount not less than $300,000,000 made by or
     on behalf of CRIC to or for the benefit of the Borrower pursuant to Section
     6.2.(B)(i) of the Regulations.

          "In-Service Date" means the close of business on the last day of the
     calendar month in which the earliest of the following occurs: (a) both
     Mechanical Completion and Specified Production Capability have been
     achieved; (b) the date on which the Owners determine by Owners Committee
     Action either that Specified Production Capability cannot, under any
     circumstances, be achieved or that additional modifications will not be
     attempted to achieve Specified Production Capability; or (c) the date that
     is 120 days after Mechanical Completion has been achieved.

          "Intellectual Property" means (a) patents and patent rights, (b)
     trademarks, trademark rights, trade names, trade name rights, corporate
     names, business names, trade styles, service marks and logos and (c)
     copyrights, in each case whether registered, unregistered or under pending
     registration under the laws of the United States or any other country.

          "Interest Payment Date" means the last day of March, June, September
     and December of each year.

          "Interest Period" means, for each Eurodollar Rate Loan, the period (a)
     commencing (i) for each such Loan comprising part of the same Borrowing, on
     the date such Loan is made, and (ii) for each such Loan into which any Loan
     has been Converted, the date of that Conversion, and (b) ending on the last
     day of the period selected by the Borrower pursuant to the provisions
     below.  In the case of all Loans, the duration of each Interest Period
     shall be one, two, three or six months, in each case as the Borrower may,
     upon notice received by the Agent not later than 12:00 Noon (New York City
     time) on the third Business day prior to the first day of such Interest
     Period, select; provided, however, that: 

                                       11
<PAGE>
 
     (a) Interest Periods commencing on the same date for Loans comprising part
     of the same Borrowing shall be of the same duration; (b) whenever the last
     day of any Interest Period would otherwise occur on a day other than a
     Business Day, the last day of such Interest Period shall be extended to
     occur on the next succeeding Business Day, provided, that if such extension
     would cause the last day of such Interest Period to occur in the next
     succeeding calendar month, the last day of such Interest Period shall occur
     on the next preceding Business Day; and (c) no more than ten Interest
     Periods may be outstanding at any time.

          "Interest Rate Protection Agreement" means, for any Person, an
     interest rate swap, cap or collar agreement or similar arrangement
     providing for the transfer or mitigation of interest risks of such Person
     either generally or under specific contingencies between such Person and
     any other Person.

          "Issuance Expenses" means, with respect to any Permitted Replacement
     Debt, without duplication of amounts, the expenses incurred by the Borrower
     in connection with its issuance or sale of such Permitted Replacement Debt
     which would be capitalized and classified as debt issuance costs on a
     balance sheet of the Borrower prepared in accordance with GAAP as in effect
     on the date of this Agreement; provided, however, that "Issuance Expenses"
     do not include (a) any amount paid or payable by the Borrower to any
     Affiliate of the Borrower (other than, if the Affiliate retains a law firm
     as its counsel in connection with such issuance or sale, the reasonable
     fees and disbursements of such firm in that connection), (b) any
     underwriting or other similar discount or commission or (c) any unamortized
     debt discount.

          "Lender" means at any time any Person then having any or all of the
     rights or obligations of a Lender and which (a) is identified as a Lender
     on the signature pages hereof or (b) has been assigned such rights or
     obligations pursuant to an Assignment Agreement.

          "Lending Office" means, with respect to each Lender, such Lender's
     Domestic Lending Office in the case of Base Rate Loans or such Lender's
     Eurodollar Lending Office in the case of Eurodollar Rate Loans.

          "Lien" means, with respect to any property or asset of any Person (or
     any revenues, income or profits of such Person therefrom) (in each case
     whether the same is consensual or nonconsensual or arises by contract,
     operation of law, legal process or otherwise), (a) any mortgage, lien,
     security interest, pledge, attachment, levy or other charge or encumbrance
     of any kind thereupon or in respect thereof or (b) any other arrangement
     under which the same is transferred, sequestered or otherwise identified
     with the intention of subjecting the same to, or making the same available
     for, the payment or performance of any liability in priority to the payment
     of the ordinary, unsecured creditors of such Person. For purposes of this
     Agreement, a Person shall be deemed to own subject to a Lien any asset that
     it has acquired or holds subject to the interest of a vendor or

                                       12
<PAGE>
 
     lessor under any conditional sale agreement, Capital Lease or other title
     retention agreement relating to such asset.

          "Litigation" means any case, proceeding, claim, grievance, lawsuit or
     investigation conducted by or pending before any Governmental Authority or
     any arbitration proceeding.

          "Loan" means a loan by a Lender to the Borrower pursuant to Section
     2.01.

          "Loan Document Claim" means any claim in connection with, arising out
     of or relating to any Loan Document or any transaction with any Lender, any
     Co-Agent or the Agent contemplated thereby, whether direct or indirect,
     whether based on any federal, state or local law or regulation, securities
     or commercial law or regulation, under common law or in equity, or on
     contract, tort or otherwise, regardless of whether the transactions
     contemplated hereby are ever consummated and regardless of when any such
     claim arises.

          "Loan Documents" means this Agreement, the Notes, the Fee Letters and
     all other agreements between the Borrower or any Subsidiary and any one or
     more of the Lenders, the Co-Agents and the Agent respecting fees payable in
     connection with this Agreement or any other Loan Document and all other
     written agreements, documents, instruments and certificates now or
     hereafter executed or delivered by the Borrower or any Subsidiary to or for
     the benefit of the Agent, any Co-Agent or any Lender pursuant to or in
     connection with any of the foregoing, and any and all amendments,
     modifications, supplements, renewals, extensions, increases, restatements,
     rearrangements or substitutions from time to time of all or any part of the
     foregoing.

          "LRC" means Lyondell Refining Company, a Delaware corporation.

          "Lyondell" means Lyondell Petrochemical Company, a Delaware
     corporation.

          "Lyondell Obligations" means the obligations of Lyondell to the
     Borrower on the date of this Agreement under Section 5.2.(A) of the
     Contribution Agreement with respect to "Pre-Closing Environmental
     Liabilities and Costs" that are included in "Retained
     Liabilities" as provided in Section 2.3.(D) of the Contribution Agreement
     and not excluded from "Retained Liabilities" by Schedule 2.3.(D) to the
     Contribution Agreement.  As used in this definition, "Contribution
     Agreement" means the Contribution Agreement as in effect  on the date of
     this Agreement, and the quoted terms in this definition have the meanings
     ascribed to them in the Contribution Agreement as in effect on the date of
     this Agreement.

          "Material" means material to the business, operations, property or
     assets, liabilities, financial condition or results of operations of the
     Borrower and the Subsidiaries considered as a whole.

                                       13
<PAGE>
 
          "Material Adverse Effect" means, relative to the occurrence or non-
     occurrence of any event and after taking into account existing or
     reasonably anticipated insurance coverage and indemnification rights with
     respect to such occurrence or non-occurrence, (a) a material adverse effect
     on the business, operations, property or assets, liabilities, condition
     (financial or otherwise) or results of operations of the Borrower and the
     Subsidiaries considered as a whole or (b) a material adverse effect on the
     ability of the Borrower to perform its payment or other obligations under
     the Loan Documents.

          "Material Agreement" means any contract or agreement to which the
     Borrower or any Subsidiary is a party or by which the Borrower or any
     Subsidiary is bound or to which any property or assets of the Borrower or
     any Subsidiary is subject and which is Material. Without limiting the
     generality of the foregoing, for purposes of this Agreement, the Supply or
     Purchase Contracts and the Contribution Agreement constitute Material
     Agreements.

          "Mechanical Completion" means completion in its entirety of the
     physical construction of the Refinery Expansion Project as described in the
     Recommended Design.

          "Moody's" means Moody's Investors Service, Inc.

          "Multiemployer Benefit Plan" means a "multiemployer plan" as defined
     in Section 4001(a)(3) of ERISA, Section 414 of the Code or Section 3(37) of
     ERISA (or any similar type of plan established or regulated under the laws
     of any foreign country) to which the Borrower or any ERISA Affiliate of the
     Borrower is making or accruing or has made or accrued an obligation to make
     contributions within six years of the time in question.

          "Multiple Employer Plan" means any "employee benefit plan" as defined
     in Section 3(3) of ERISA, other than a Multiemployer Benefit Plan, that is
     subject to Title IV of ERISA and to which the Borrower or any ERISA
     Affiliate of the Borrower and an employer other than the Borrower or any
     ERISA Affiliate of the Borrower contribute or have an obligation to
     contribute.

          "Net Income" means, for any period, the aggregate net income (or net
     loss) of the Borrower and the Subsidiaries for such period determined on a
     consolidated basis in accordance with GAAP as in effect on the date of this
     Agreement and as applied on a basis consistent with the basis on which GAAP
     was applied in the preparation of the Initial Financial Statements.

          "Net Proceeds" means, with respect to any Permitted Replacement Debt,
     (a) the Gross Proceeds of such Permitted Replacement Debt, minus (b) the
     Issuance Expenses paid or payable by the Borrower in connection with the
     issuance or sale of such Permitted Replacement Debt.

                                       14
<PAGE>
 
          "Note" means a promissory note of the Borrower in the form of 
     Exhibit A.

          "Notice of Borrowing" has the meaning specified in Section 2.02(a).

          "Notice of Conversion" has the meaning specified in Section 2.06.

          "Obligations" means all obligations or liabilities of any form or
     nature, whether matured or unmatured, fixed or contingent, of the Borrower
     to the Agent, any Co-Agent or any Lender in connection with, arising under
     or related to any Loan Document or any Permitted Interest Rate Protection
     Agreement between the Borrower and any Lender.

          "Outside Representatives" means, with respect to any Person, the
     Representatives of such Person other than its own directors, officers,
     employees and Affiliates.

          "Owner Refinery Expansion Project Investments" means the funds Section
     6.3 of the Regulations requires CRIC and LRC to provide to the Borrower for
     the Refinery Expansion Project (a) in the form of cash contributions, in
     the case of CRIC, and (b) in the form of loans pursuant to Section 6.4.(D)
     of the Regulations and on the terms set forth in Exhibit 6.4.(D) to the
     Regulations, in the case of LRC.

          "Owners" means LRC and CRIC and any of their respective successors and
     assigns under the Regulations.

          "Owners Committee" means the committee of representatives of the
     Owners through which the Owners manage the Borrower in accordance with the
     Regulations.

          "Owners Committee Action" has the meaning specified in Section 3.6.(A)
     of the Regulations.

          "PBGC" means the Pension Benefit Guaranty Corporation.

          "Permitted Interest Rate Protection Agreement" means an Interest Rate
     Protection Agreement between the Borrower and a Lender or other financial
     institution having combined capital and surplus of at least $500,000,000 or
     that has (or that is a subsidiary of a bank holding company that has)
     publicly traded unsecured long-term debt securities given a rating of A-
     (or the equivalent rating then in effect) or better by S&P or a rating of
     A3 (or the equivalent rating then in effect) or better by Moody's.

          "Permitted Investments" means (a) at the time of purchase or other
     acquisition by the Borrower or any Subsidiary, (i) obligations issued or
     guaranteed by the United States of America with a remaining maturity not
     exceeding one year, (ii) commercial paper with maturities of not more than
     270 days and a published rating of not less than A-1 (or the equivalent
     rating then in effect) by S&P or P-1 (or the equivalent rating then in
     effect) by Moody's, (iii) certificates of deposit and bankers' acceptances
     having maturities of not 

                                       15
<PAGE>
 
     more than one year of any Lender or any commercial bank or trust company if
     (A) such bank or trust company has a combined capital and surplus of at
     least $500,000,000 and (B) its unsecured long-term debt obligations, or
     those of a holding company of which it is a subsidiary, are rated not less
     than A- (or the equivalent rating then in effect) by S&P or A3 (or the
     equivalent rating then in effect) by Moody's, (b) Capital Securities of, or
     loans or advances to, any Wholly-Owned Subsidiary, provided, that if any
     Person that is a Wholly-Owned Subsidiary ceases at any time to be a Wholly-
     Owned Subsidiary, Capital Securities of that Person remaining owned by the
     Borrower or any Subsidiary, and any loans or advances to that Person by the
     Borrower or any Subsidiary remaining outstanding, will cease being
     Permitted Investments at that time and will be deemed acquired or made at
     that time for purposes of Section 7.13, (c) advances made by the Borrower
     to the Owners pursuant to and in accordance with Section 7.6 of the
     Regulations so long as no Event of Default exists or would exist after
     giving effect thereto, provided, that if any such advance is not repaid in
     the manner required by Section 7.6 of the Regulations within 90 days of the
     date of such advance, such advance will cease being a Permitted Investment
     at the close of business on such 90th day and will be deemed made at that
     time for purposes of Section 7.13, and (d) the promissory note in the form
     set forth in Exhibit 6.6.(E) to the Regulations as in effect on the date
     hereof, if any, delivered by CRIC to the Borrower pursuant to and in
     accordance with Section 6.6.(E) of the Regulations.

          "Permitted Liens" means, as applied to the property or assets of any
     Person (or any revenues, income or profits of such Person therefrom): (a)
     Liens for Taxes if the same are not at the time due and delinquent or (if
     foreclosure, distraint, sale or other similar proceedings have not been
     commenced or, if commenced, have been stayed) are being contested in good
     faith and by appropriate proceedings, and if such Person has set aside on
     its books such reserves (segregated to the extent required by sound
     accounting practices) as may be required by GAAP; (b) Liens of carriers,
     warehousemen, mechanics, laborers and materialmen for sums not yet due or
     (if foreclosure, distraint, sale or other similar proceedings have not been
     commenced or, if commenced, have been stayed) being contested in good faith
     and by appropriate proceedings, if such Person has set aside on its books
     such reserves (segregated to the extent required by sound accounting
     practices) as may be required by GAAP; (c) Liens incurred in the ordinary
     course of such Person's business in connection with workmen's compensation,
     unemployment insurance and other social security legislation (other than
     pursuant to ERISA or Section 412(n) of the Code); (d) Liens incurred in the
     ordinary course of such Person's business in connection with deposit
     accounts or to secure the performance of bids, tenders, trade contracts,
     statutory obligations, surety and appeal bonds, performance and return-of-
     money bonds and other obligations of like nature; (e) easements, rights-of-
     way, reservations, restrictions and other similar encumbrances incurred in
     the ordinary course of such Person's business or existing on property and
     not materially interfering with the ordinary conduct of such Person's
     business; (f) defects or irregularities in such Person's title to its real
     properties which do not materially interfere with the ordinary course of
     such Person's business (provided that, in the case of the Houston Facility
     and the Birmingport Facility, such defects or 

                                       16
<PAGE>

     irregularities also do not materially diminish the value, from the value as
     of the date of this Agreement, of the surface estate (the defects or
     irregularities as of the date of this Agreement with respect to the Houston
     Facility being set forth in the Commitment for Title Insurance issued by
     Commonwealth Land Title Company of Houston, as agent for Commonwealth Land
     Title Insurance Company, under GF No. 9210852, dated effective as of April
     7, 1995, and with respect to the Birmingport Facility being set forth in
     the Commitment for Title Insurance issued by Alabama Title Co., Inc., as
     agent for Commonwealth Land Title Insurance Company, under File No. 2571-
     FF, dated effective as of March 21, 1995)); (g) legal or equitable
     encumbrances deemed to exist by reason of negative pledges such as Section
     7.05; (h) any interest or title of a lessor of assets being leased by any
     Person pursuant to any Capital Lease permitted by Section 7.09(f) or any
     lease that, pursuant to GAAP, would be accounted for as an operating lease;
     (i) Liens securing purchase money Indebtedness permitted by Section 7.09(f)
     so long as such Liens do not attach to any property or assets other than
     the properties or assets purchased with the proceeds of such Indebtedness;
     and (j) other Liens (other than pursuant to ERISA or Section 412(n) of the
     Code), provided that the obligations secured thereby do not exceed in the
     aggregate $1,000,000 at any time outstanding.

          "Permitted Replacement Debt" means Indebtedness of the Borrower (a)
     that is evidenced by notes, bonds, debentures or similar instruments issued
     or sold by the Borrower for cash, (b) that is not secured, directly or
     indirectly, by any Lien upon any property or assets of the Borrower or any
     Subsidiary (or any revenues, income or profits of the Borrower or any
     Subsidiary therefrom) and (c) the Gross Proceeds from the issuance or sale
     of which are used by the Borrower until such time as all Loans and all
     Obligations then owing have been paid in full and no Lender has any
     Commitment hereunder solely (i) to prepay any then outstanding Loans
     pursuant to Section 3.02(a), (ii) to pay the Issuance Expenses, if any,
     incurred by the Borrower in connection with such issuance or sale and (iii)
     to pay, if all Loans have been paid in full, such other Obligations as have
     then become due; provided, however, that unless and until the Loans have
     been paid in full (or are paid in full with the proceeds thereof) and no
     Lender has any Commitment hereunder, any such Indebtedness shall constitute
     Permitted Replacement Debt only to the extent that (A) such Indebtedness
     does not by its terms, or by the terms of any agreement or contract under
     or pursuant to which it is issued or by which it is governed, provide for
     any of the following to occur prior to the first anniversary of the
     Termination Date: (1) a scheduled payment of any portion of the principal
     amount or accreted value of any such Indebtedness, (2) a mandatory
     prepayment, redemption or repurchase of any portion of the principal amount
     or accreted value of any such Indebtedness (in the absence of an
     acceleration of the entire principal amount or accreted value of such
     Indebtedness by the holders thereof or their representative by reason of
     the occurrence, or the occurrence and continuation, of a default or an
     event of default with respect thereto) or (3) the irrevocable deposit,
     segregation or setting aside of any funds or assets by the Borrower, and
     (B) if such Indebtedness constitutes Affiliate Indebtedness of the
     Borrower, it is Qualified Subordinated Debt.

                                       17
<PAGE>
 
          "Person" means any individual, sole proprietorship, corporation,
     partnership, limited liability company, business trust, unincorporated
     organization, mutual company, joint stock company, estate, trust, union,
     employee organization or Governmental Authority or, for the purpose of the
     definition of "ERISA Affiliate," any trade or business.

          "Post-Completion Period" means the period (a) beginning on the first
     date on which (i) both Mechanical Completion and Specified Production
     Capability have been achieved and (ii) the Borrower has delivered to the
     Agent (A) a report in form reasonably satisfactory to the Agent from an
     independent engineer selected by the Borrower and reasonably acceptable to
     the Agent to the effect, and (B) a certificate in form reasonably
     satisfactory to the Agent of a Responsible Officer representing and
     warranting to the effect, that both Mechanical Completion and Specified
     Production Capability have been achieved and (b) ending on the date on
     which all Obligations have been paid in full and no Lender has any further
     obligation to make any Loan hereunder.

          "Post-In-Service Date Contributions" means all cash contributions to
     the Borrower made by or on behalf of CRIC pursuant to Sections 6.6.(C) and
     (D) of the Regulations.

          "Pre-Completion Period" means the period beginning as of the date of
     this Agreement and ending immediately prior to the beginning of the Post-
     Completion Period.

          "Prime Rate" means the fluctuating prime commercial lending rate of
     The Bank of New York, as publicly announced to be in effect from time to
     time.  The Prime Rate shall be adjusted automatically, without notice, on
     the effective date of any change in such prime commercial lending rate.
     The Prime Rate is not necessarily the lowest rate of interest of The Bank
     of New York.

          "Prohibited Transaction" means any transaction that is prohibited
     under Section 4975 of the Code or Section 406 of ERISA and not exempt under
     Section 4975 of the Code or Section 408 of ERISA, provided that, with
     respect to any transactions involving a Loan, the ERISA Assumptions set
     forth on Schedule A are deemed to be true.

          "Prospective Assignees" means all Eligible Assignees that are
     prospective assignees of any Lender.

          "Prospective Participants" means all Eligible Assignees that are
     prospective participants of any Lender.

          "Qualified Subordinated Debt" means any Indebtedness of the Borrower
     (a)(i) to CRIC or LRC, or any Affiliate of either CRIC or LRC, having, at
     the option of the Borrower, (A) subordination terms substantially identical
     to those set forth in Exhibit 6.4.(D) to the Regulations as in effect on
     the date of this Agreement or (B) such other terms of subordination as are
     satisfactory to the Required Lenders or (ii) to any other Person, having
     subordination terms reasonably satisfactory to the Required Lenders 

                                       18
<PAGE>
 
     and (b) unless and until the Loans have been paid in full (or are paid in
     full with the proceeds thereof) and no Lender has any Commitment hereunder,
     which does not by its terms, or by the terms of any agreement or contract
     under or pursuant to which it is issued or by which it is governed, provide
     for any of the following to occur prior to the first anniversary of the
     Termination Date: (i) a scheduled payment of any portion of the principal
     amount or accreted value of any such Indebtedness, (ii) a mandatory
     prepayment, redemption or repurchase of any portion of the principal amount
     or accreted value of any such Indebtedness (in the absence of an
     acceleration of the entire principal amount or accreted value of such
     Indebtedness by the holders thereof or their representative by reason of
     the occurrence, or the occurrence and continuation, of a default or an
     event of default with respect thereto) or (iii) the irrevocable deposit,
     segregation or setting aside of any funds or assets by the Borrower;
     provided, however, that any outstanding Qualified Subordinated Debt that is
     Affiliate Indebtedness of the Borrower shall cease to be Qualified
     Subordinated Debt in the event that (i) such Affiliate Indebtedness is, in
     the good faith judgment of the Required Lenders, more favorably
     subordinated to holders of Indebtedness pari passu with the Obligations
     than such Affiliate Indebtedness is subordinated to the Obligations and
     (ii) the Borrower does not concurrently therewith cause to be effected
     either an amendment of such Affiliate Indebtedness, or a legally, valid,
     binding and enforceable agreement relating thereto, whereby such Affiliate
     Indebtedness is subordinated to the Obligations on terms substantially
     identical to the terms on which it is subordinated to such pari passu
     Indebtedness.

          "Ratable Portion" means, as of the date of any determination, for each
     Lender, the fraction, expressed as a percentage, the numerator of which is
     such Lender's Commitment and the denominator of which is the Total
     Commitment.

          "Receiving Party" means the Agent, any Co-Agent or any Lender.

          "Recommended Design" means the design for the Refinery Expansion
     Project heretofore approved by Owners Committee Action, together with any
     modifications to such design that may be approved from time to time by
     Owners Committee Action.

          "Refined Products Purchase Agreement" means the Product Sales
     Agreement (Refined Products-CITGO Petroleum Corporation) dated as of July
     1, 1993 between the Borrower and CITGO, as amended, modified and
     supplemented from time to time to the extent permitted by Section 7.17.

          "Refinery" means at any time the refinery of the Borrower located in
     Houston, Texas.

          "Refinery Expansion Budget" means the budget for completing the
     Refinery Expansion Project in accordance with the Recommended Design which
     is approved from time to time by Owners Committee Action.

                                       19
<PAGE>
 
          "Refinery Expansion Project" means the Borrower's project to upgrade
     the capacity of the Refinery substantially in accordance with the
     Recommended Design.

          "Register" has the meaning specified in Section 10.06(b).

          "Regulations" means the Amended and Restated Limited Liability Company
     Regulations of the Borrower dated July 1, 1993, as amended, modified and
     supplemented on the Closing Date and thereafter from time to time to the
     extent no Event of Default occurs under Section 8.01(i)(iii) as a result of
     such amendment, modification or supplement, unless the context otherwise
     requires.

          "Regulations G, T, U and X" means Regulations G, T, U and X of the
     Board of Governors of the Federal Reserve System.

          "Representatives" means, with respect to any Person, the directors,
     officers, employees, Affiliates, accountants, advisors, attorneys,
     consultants or other agents of such Person, or any other representatives of
     such Person or of any of such directors, officers, employees, Affiliates,
     accountants, advisors, attorneys, consultants or other agents.

          "Reportable Event" means, with respect to any Benefit Plan of any
     Person, (i) the occurrence of any of the events set forth in Section
     4043(b) or (c) (other than a Reportable Event as to which the provision of
     30 days' notice to the PBGC is waived under applicable regulations),
     4062(e) or 4063(a) of ERISA with respect to such Benefit Plan, (ii) any
     event requiring such Person or any of its ERISA Affiliates to provide
     security to such Benefit Plan under Section 401(a)(29) of the Code or (iii)
     any failure to make a payment required by Section 412(m) of the Code with
     respect to such Benefit Plan.

          "Required Lenders" means, at the time of any determination, Lenders
     holding at least 66 2/3% of the then aggregate unpaid principal amount of
     the Notes or, if no such principal amount is then outstanding, Lenders
     having at least 66 2/3% of the Total Commitment; provided, however, that
     for purposes of (a) any amendment of, any consent under, or waiver of any
     failure of the Borrower to perform or observe any term, covenant, condition
     or agreement contained in, Section 7.17(a) (other than with respect to the
     Refined Products Purchase Agreement), (b) any amendment of, or waiver of
     any Event of Default specified in, Section 8.01(i)(i) (other than with
     respect to the Refined Products Purchase Agreement) or (c) any amendment or
     waiver of this proviso, "Required Lenders" means, at the time of any
     determination, Lenders holding at least 80% of the then aggregate unpaid
     principal amount of the Notes or, if no such principal amount is then
     outstanding, Lenders having at least 80% of the Total Commitment.

          "Responsible Officer" means the President, the Chief Financial
     Officer, the Controller, any Vice President or the General Counsel of the
     Borrower.

                                       20
<PAGE>
 
          "Restricted Payment" means (a) with respect to any Person, any of the
     following effected by such Person:  (i) any declaration or payment of any
     dividend or other distribution, direct or indirect, on account of any
     Capital Securities of such Person now or hereafter outstanding, (ii) any
     direct or indirect redemption, retirement, purchase or other acquisition
     for value of or direct or indirect purchase, payment or sinking fund or
     similar deposit for the redemption, retirement, purchase or other
     acquisition for value of, or to obtain the surrender of, any Capital
     Securities of such Person now or hereafter outstanding or any warrants,
     options or other rights to acquire or subscribe for purchase of Capital
     Securities of such Person or any Subsidiary of such Person now or hereafter
     outstanding or (iii) any payment or prepayment of principal of, premium or
     interest, fees or other charges on or with respect to, and any redemption,
     purchase, retirement, defeasance, sinking fund or similar payment of, or of
     any claim to rescission with respect to, any Affiliate Indebtedness of such
     Person or any Indebtedness of such Person subordinated by the terms thereof
     to the prior payment of the Obligations and (b), with respect to the
     Borrower or any Subsidiary, any of the following effected directly or
     indirectly by such Person:  any payment or prepayment of principal of or
     premium on or with respect to, or any redemption, purchase, retirement,
     defeasance, sinking fund or similar payment of, or of any claim to
     rescission with respect to, any Permitted Replacement Debt that is not
     Affiliate Indebtedness of the Borrower.  Without limiting the generality of
     the foregoing, a "Restricted Payment" by the Borrower or any Subsidiary
     includes any distribution made by the Borrower, or any Subsidiary for the
     account of the Borrower, to an Owner pursuant to the Regulations,
     including, without limitation, Sections 7.2, 7.4, 7.5 and 7.6 thereof.

          "Revolving Credit Agreement" means (a) the Revolving Credit Agreement
     dated as of the date of this Agreement among the Borrower, the lenders and
     co-agents that are parties thereto and The Bank of New York, as the agent
     for such lenders and as issuer, as amended, modified and supplemented from
     time to time, or (b) any revolving credit agreement replacing such
     Revolving Credit Agreement, whether such replacement is contemporaneous
     with the termination or expiration of a prior "Revolving Credit Agreement"
     or at any time after such termination or expiration, provided that, to
     constitute a "Revolving Credit Agreement" for purposes of this definition,
     any such agreement at any time in effect must be in form and substance
     reasonably satisfactory to the Required Lenders.

          "Revolving Credit Agreement Letter of Credit Obligations" means at any
     time the obligations of the Borrower in respect of letters of credit issued
     under the Revolving Credit Agreement at such time.

          "Revolving Credit Loan" means any loan made to the Borrower under the
     Revolving Credit Agreement.

          "Service Agent" has the meaning specified in Section 10.08.

                                       21
<PAGE>
 
          "Specified Production Capability" means the demonstration by all
     principal operating units included in the Refinery Expansion Project, as a
     whole, of the capability (a) to operate for at least seven consecutive days
     with the designed feedstocks at a minimum of 95% of the feedrate in the
     Recommended Design and (b) to produce refined products substantially in
     accordance with the product slate and quality specifications included in
     the Recommended Design.

          "S&P" means Standard and Poor's Rating Group.

          "Subsidiary" means any corporation or other Person of which Capital
     Securities 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 Capital Securities of such corporation or other Person 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 the Borrower.

          "Supplemental Supply Agreement" means the Supplemental Supply
     Agreement, dated as of May 5, 1993, between the Borrower and Petroleos de
     Venezuela, S.A., a corporation organized under the laws of the Republic of
     Venezuela, as amended, modified and supplemented from time to time to the
     extent permitted by Section 7.17, unless the context otherwise requires.

          "Supply or Purchase Contracts" means (a) the Crude Supply Agreement,
     (b) the Supplemental Supply Agreement and (c) the Refined Products Purchase
     Agreement.

          "Taxes" means all taxes, assessments, fees, levies, imposts, duties,
     deductions, withholdings or other charges of any nature whatsoever from
     time to time or at any time imposed by any Governmental Requirement,
     excluding, in the case of each Lender, each Co-Agent and the Agent, taxes
     imposed on its income, and franchise taxes and doing business taxes imposed
     on it by the laws of any jurisdiction (or political subdivision thereof).

          "Termination Date" means the earlier of (a) May 5, 2000 and (b) any
     date on which the Loans become due and payable in full, whether by
     acceleration or otherwise under this Agreement.

          "Termination Event" means, with respect to any Benefit Plan, (a) any
     Reportable Event with respect to such Benefit Plan which is likely to
     result in the termination of such Benefit Plan, (b) the termination of such
     Benefit Plan, or the filing of a notice of intent to terminate such Benefit
     Plan, or the treatment of any amendment to such Benefit Plan as a
     termination under Section 4041(c) of ERISA, (c) the institution of
     proceedings to terminate such Benefit Plan under Section 4042 of ERISA, (d)
     the appointment of a trustee to administer such Benefit Plan under Section
     4042 of ERISA or (e) any 

                                       22
<PAGE>
 
     occurrence similar to any of those referred to in clauses (a) through (d)
     above under the applicable Governmental Requirements of a foreign country.

          "TLLCA" means the Texas Limited Liability Company Act.

          "Total Commitment" means $450,000,000, the aggregate amount of the
     Commitments, as such amount may be reduced from time to time pursuant to
     Sections 2.03, 3.02 and 3.03.

          "Type" refers to a Base Rate Loan or a Eurodollar Rate Loan.

          "United States Person" has the meaning specified in Section 3.06(d).

          "Welfare Plan" means an "employee welfare benefit plan" as defined in
     Section 3(1) of ERISA in which any personnel of the Borrower or any ERISA
     Affiliate of the Borrower participate, excluding any Multiemployer Benefit
     Plan subject to ERISA.

          "Wholly-Owned Subsidiary" means any corporation or other Person all of
     whose outstanding Capital Securities are owned and controlled, directly or
     indirectly, by the Borrower.

          Section 1.02  Other Definitional Provisions.  (a) Except as otherwise
specified herein, all references herein to any Governmental Requirement defined
or referred to herein, including the Code, ERISA and the TLLCA, shall be deemed
references to such Governmental Requirement or any successor Governmental
Requirement, as the same may have been or may be amended or supplemented from
time to time, and any rules or regulations promulgated thereunder.

          (b) When used in this Agreement, the words "herein," "hereof" and
"hereunder" and words of similar import shall refer to this Agreement as a whole
and not to any provision of this Agreement, and the words "Article," "Section,"
"Annex," "Schedule" and "Exhibit" shall refer to Articles and Sections of, and
Annexes, Schedules and Exhibits to, this Agreement unless otherwise specified.

          (c) Whenever the context so requires, the singular number includes the
plural and vice versa.

          (d) The word "including" (and, with correlative meaning, the word
"include") means including, without limiting the generality of any description
preceding such word.

          (e) References in this Agreement or any other Loan Document to the
Borrower's knowledge shall be deemed references to the actual knowledge of one
or more of the Responsible Officers.

                                       23
<PAGE>
 
          Section 1.03  Captions.  Captions to Articles, Sections and
subsections of, and Annexes, Schedules and Exhibits to, this Agreement are
included for convenience of reference only and shall not constitute a part of
this Agreement for any other purpose or in any way affect the meaning or
construction of any provision of this Agreement.


                                  ARTICLE II.

                                CREDIT FACILITY

          Section 2.01  The Facility.  Each Lender severally agrees, on the
terms and conditions hereinafter set forth, to make Loans to the Borrower from
time to time on any Business Day during the period from the date hereof until
the Termination Date in an aggregate amount not to exceed such Lender's
Commitment.  Each Borrowing shall be in an aggregate amount not less than
$1,000,000 or an integral multiple of $100,000 in excess thereof and shall
consist of Loans of the same Type made on the same day by the Lenders ratably
according to their respective Commitments.  The obligation of each Lender to
make Loans is subject to the satisfaction of the conditions applicable to the
making of Loans which are set forth in Article IV.  The principal amount
outstanding of all Loans shall mature and be due and payable, together with all
accrued and unpaid interest thereon, on the Termination Date.

          Section 2.02  Making the Loans. (a) Each Borrowing shall be made on
written notice given by the Borrower to the Agent not later than 12:00 Noon (New
York City time) on (i) one Business Day prior to the date of the Borrowing in
the case of a Borrowing consisting of Base Rate Loans and (ii) the third
Business Day prior to the date of the Borrowing in the case of a Borrowing
consisting of Eurodollar Rate Loans.  Each such notice of a Borrowing (a "Notice
of Borrowing") shall be in the form of Exhibit 2.02 and shall specify (A) the
date of such Borrowing, (B) the number of Borrowings and the Type and aggregate
principal amount of Loans comprising each Borrowing and (C) in the case of a
Borrowing comprised of Eurodollar Rate Loans, the initial Interest Period for
each such Loan. Each Notice of Borrowing shall be irrevocable and binding on the
Borrower. The Agent shall promptly deliver a copy of each Notice of Borrowing to
each Lender.

          (b) Each Lender shall, before 12:00 Noon (New York City time) on the
date of such Borrowing, make available for the account of its applicable Lending
Office to the Agent at the Agent's Office, in immediately available funds, such
Lender's Ratable Portion of such Borrowing.  After the Agent's receipt of such
funds and, upon fulfillment of the applicable conditions set forth in Article
IV, the Agent shall make such funds available to the Borrower's account at the
Agent's Office or as otherwise designated in the Notice of Borrowing.

          (c) Unless the Agent has received notice from a Lender prior to 11:00
A.M. (New York City time) on the date of any Borrowing that such Lender will not
make available to the Agent such Lender's Ratable Portion of such Borrowing, the
Agent may assume such Lender has made such portion available to the Agent on the
date of such Borrowing in 

                                       24
<PAGE>
 
accordance with Section 2.02(b) and the Agent in its sole discretion may, in
reliance on such assumption, make available to the Borrower on such date a
corresponding amount on behalf of such Lender. If and to the extent that such
Lender shall not have so made its Ratable Portion of a Borrowing available to
the Agent, such Lender and the Borrower severally agree to repay to the 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 Agent, at (i) in the case of the Borrower,
the interest rate applicable at the time to Loans comprising such Borrowing, and
(ii) in the case of such Lender, the Federal Funds Rate until (and including)
the third Business Day after demand is made and thereafter at the Base Rate. If
such Lender shall repay to the Agent such corresponding amount, such amount so
repaid shall constitute such Lender's Loan as part of such Borrowing for
purposes of this Agreement. If the Borrower shall repay to the Agent such
corresponding amount, the Borrower shall have no liability with respect to
losses, costs or expenses otherwise compensable under Section 3.04 in connection
therewith.

          (d) The obligations of the Lenders to make Loans to the Borrower
pursuant to this Agreement are several and not joint or joint and several, and
the failure of any Lender to make the Loan to be made by it as part of any
Borrowing shall not relieve any other Lender of its obligation, if any,
hereunder to make its Loan on the date of such Borrowing, but no Lender shall be
responsible for the failure of any other Lender to make the Loan to be made by
such other Lender on the date of any Borrowing.

          Section 2.03  Reduction of Commitments.  The Borrower shall have the
right, subject to the terms and conditions set forth in Section 3.02, on at
least three Business Days' notice to the Agent to terminate in whole or, from
time to time, reduce ratably in part the unused portion of the Total Commitment,
provided that each partial reduction of the Total Commitment shall be in an
aggregate amount equal to the lesser of (a) $5,000,000 or an integral multiple
of $1,000,000 in excess thereof or (b) the entire unused portion of the Total
Commitment.  Upon receipt of any such notice, the Agent shall promptly notify
each Lender of the contents thereof and the amount to which such Lender's
Commitment is to be reduced.  No termination or partial reduction of the Total
Commitment pursuant to this Section 2.03 may be reinstated.

          Section 2.04  Fees.  The Borrower agrees to pay, without duplication,
to the Agent, for the ratable account of the Lenders, a commitment fee on the
average daily unused amount of the Total Commitment from the Closing Date until
the Termination Date at the rate of 0.175% per annum, calculated on the basis of
a 360-day year for the actual number of days elapsed, payable in arrears on each
Interest Payment Date, on the date of any reduction of the Total Commitment (to
the extent accrued and unpaid on the amount of such reduction) and on the
Termination Date.

          Section 2.05  Interest; Determination and Protection; Illegality.  (a)
Rates.  Each Loan shall bear interest at the rates set forth below, and the
Borrower shall pay interest on the unpaid principal amount of each Loan made by
each Lender from the date of such Loan until 

                                       25
<PAGE>
 
such principal amount shall be paid in full, at the times and at the rates per
annum set forth below:

          (i) Base Rate Loans.  During such periods as such Loan is a Base Rate
     Loan, a rate per annum equal at all times to the Base Rate in effect from
     time to time and payable on (A) each Interest Payment Date, commencing June
     30, 1995, (B) the date such Base Rate Loan shall be Converted and (C) the
     Termination Date.

          (ii) Eurodollar Rate Loans.  During such periods as such Loan is a
     Eurodollar Rate Loan, a rate per annum equal at all times during each
     Interest Period for such Loan to the Adjusted Eurodollar Rate for such
     Interest Period, payable on (A) the last day of such Interest Period and,
     in the case of a Eurodollar Rate Loan having an Interest Period longer than
     three months, on the three-month anniversary of the first day of such
     Interest Period and (B) the Termination Date.

          (iii)  Default Rate.  After the occurrence of any Event of Default
     specified in Section 8.01(a) and consisting of the failure of the Borrower
     to pay any principal of any Note or interest thereon and during the
     continuance thereof, automatically and without any action by the Agent, any
     Co-Agent or any Lender, to the extent permitted by applicable law, the
     outstanding Obligations shall bear interest at a rate per annum equal to
     the Default Rate.  Such interest shall be payable on demand and accrue
     until the earliest of (A) the waiver of such Event of Default by the
     requisite number of Lenders or the cure of such Event of Default, (B)
     agreement by the requisite number of Lenders to rescind the charging of
     interest at the Default Rate or (C) payment in full of the Obligations and
     termination of the Total Commitment.

          (b) Interest Rate Determination and Protection; Illegality. (i) The
Adjusted Eurodollar Rate for each Eurodollar Rate Loan specified in a Notice of
Borrowing or a Notice of Conversion shall be determined by the Agent two
Business Days before the first day of the Interest Period applicable for such
Loan. The Agent shall give prompt notice to the Borrower and the Lenders of the
applicable Adjusted Eurodollar Rate determined by the Agent for purposes of
Section 2.05(a)(ii), and each such determination by the Agent shall be
conclusive, absent manifest error. If for any reason the Agent is unable to
determine the Adjusted Eurodollar Rate for any Eurodollar Loan, the Agent shall
so notify the Borrower and the Lenders, whereupon:

          (A) such Loan will automatically, on the last day of the then existing
     Interest Period therefor, Convert into a Base Rate Loan (or if such Loan is
     then a Base Rate Loan, will continue as a Base Rate Loan); and

          (B) the obligation of the Lenders to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until the Agent notifies the
     Borrower and the Lenders that the circumstances causing such suspension no
     longer exist.

                                       26
<PAGE>
 
          (ii) If, with respect to any Eurodollar Rate Loans, any Lender
reasonably determines that the Adjusted Eurodollar Rate for any Interest Period
for such Loans will not adequately reflect the cost to such Lender of making,
funding or maintaining its Eurodollar Rate Loans for such Interest Period, such
Lender shall forthwith so notify the Borrower and the Agent, whereupon:

          (A) each Eurodollar Rate Loan of such Lender that has been affected
     will automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Loan; and

          (B) the obligation of such Lender to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until such Lender shall notify the
     Borrower and the Agent that the circumstances causing such suspension no
     longer exist.

          (iii)  If the Borrower shall fail to deliver to the Agent a Notice of
Conversion in accordance with Section 2.06 to select the duration of any
Interest Period for the principal amount outstanding under any Eurodollar Rate
Loan prior to the last day of the Interest Period applicable to such Loan, such
Loan will automatically, on the last day of the then existing Interest Period
therefor, Convert into a Base Rate Loan.

          (iv) Notwithstanding any other provision of this Agreement, if any
Lender shall notify the Agent and the Borrower that the introduction of, any
change in the interpretation of or any change in any Governmental Requirement
after the date hereof makes it unlawful, or any central lender or comparable
agency or other Governmental Authority asserts after the date hereof that it is
unlawful, for any such Lender or its Eurodollar Lending Office to perform its
obligations hereunder to make Eurodollar Rate Loans or to fund or maintain
Eurodollar Rate Loans hereunder,

          (A) the obligation of such Lender to make, or to Convert Loans into,
     Eurodollar Rate Loans shall be suspended until such Lender shall notify the
     Borrower and the Agent that the circumstances causing such suspension no
     longer exist, and

          (B) each Eurodollar Rate Loan of such Lender then outstanding shall be
     Converted automatically into a Base Rate Loan effective on the Agent's
     receipt of such notification or, if lawful as determined by such Lender in
     good faith, on the last day of the Interest Period then currently
     applicable to such Eurodollar Rate Loan, as the case may be.

          (v) Each Lender will promptly notify the Borrower of any event
occurring after the date of this Agreement which will cause the Adjusted
Eurodollar Rate not to adequately reflect such Lender's costs or which makes it
unlawful for such Lender to make or maintain Eurodollar Rate Loans, and will
designate a different Lending Office if such designation will avoid such
inadequacy or unlawfulness and will not, in the judgment of such Lender, be
otherwise disadvantageous to such Lender.

                                       27
<PAGE>
 
          Section 2.06  Voluntary Interest Rate Conversion.  The Borrower may on
any Business Day, on notice ("Notice of Conversion") given by the Borrower to
the Agent not later than 12:00 Noon (New York City time) (a) on the third
Business Day prior to the date of the proposed Conversion of Loans into
Eurodollar Rate Loans or (b) prior to the date of the proposed Conversion of
Eurodollar Rate Loans to Base Rate Loans and subject to the provisions of
Section 2.05 and the provisions of Sections 4.04 and 4.05, Convert all Loans of
one Type comprising the same Borrowing or Borrowings into Loans of another Type
or Convert all Eurodollar Rate Loans comprising the same Borrowing or Borrowings
into Eurodollar Rate Loans having a different Interest Period; provided,
however, that any Conversion of any Eurodollar Rate Loans into Base Rate Loans
and of any Eurodollar Rate Loans into Eurodollar Rate Loans having a different
Interest Period shall be made on, and only on, the last day of an Interest
Period for such Eurodollar Rate Loans.  Each such Notice of Conversion shall
specify therein the requested (i) date of such Conversion, (ii) the Loans to be
Converted and (iii) if such Conversion is into Loans constituting Eurodollar
Rate Loans or Eurodollar Rate Loans having a different Interest Period, the
duration of the Interest Period for each such Loan.  Each Notice of Conversion
shall be irrevocable and binding on the Borrower.  The Agent shall promptly
deliver a copy of each Notice of Conversion to each Lender.  Each Conversion
shall be in an aggregate amount not less than $1,000,000 or an integral multiple
of $100,000 in excess thereof.

                                  ARTICLE III.

                PAYMENTS, PREPAYMENTS, INCREASED COSTS AND TAXES

          Section 3.01  Payments and Computations. (a) The Borrower shall make
each payment under this Agreement and under the Notes not later than 12:00 Noon
(New York City time) on the day when due in Dollars to the Agent at the Agent's
Office in immediately available funds.  Each payment by the Borrower shall be
made without set-off, counterclaim or other deduction whatsoever. The Agent will
promptly thereafter cause to be distributed like funds relating to the payment
of principal or interest or fees payable to the Lenders (to the extent received
by the Agent) ratably to the Lenders for the account of their respective Lending
Offices and like funds relating to the payment of any other amount payable to
any Lender (to the extent received by the Agent) to such Lender for the account
of its Lending Office, in each case to be applied in accordance with the terms
of this Agreement. Fees payable pursuant to Section 2.04 to a Lender are for the
account of such Lender's Lending Office as such Lender shall designate by notice
to the Agent.

          (b) Whenever any payment hereunder or under the Notes shall be stated
to be due on a day other than a Business Day, such payment shall be made on the
next succeeding Business Day, and such extension of time shall in such case be
included in the computation of payment of interest or fees, as the case may be;
provided, however, if such extension would cause payment of interest on or
principal of Eurodollar Rate Loans to be made in the next succeeding calendar
month, such payment shall be made on the next preceding Business Day.

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<PAGE>
 
          (c) All computations of interest hereunder at the Base Rate shall be
made by the Agent on the basis of a year of 365 or 366 days, as the case may be,
for each day that the Prime Rate is the basis for such computation, and on the
basis of a year of 360 days for each day that the Federal Funds Rate is the
basis for such computation, and all computations of interest hereunder based on
the Adjusted Eurodollar Rate shall be made by the Agent on the basis of a year
of 360 days, in each case for the actual number of days (including the first day
but excluding the last day) occurring in the period for which such interest is
payable.  Each determination by the Agent of an interest rate hereunder shall be
conclusive, absent manifest error.

          (d) Unless the Agent shall have received notice from the Borrower
prior to the date on which any payment is due to the Lenders that the Borrower
will not make such payment in full, the Agent may assume that the Borrower has
made such payment in full to the Agent on such date and the Agent may, in
reliance upon such assumption, cause to be distributed to each Lender on such
due date an amount equal to the amount then due such Lender.  If and to the
extent the Borrower shall not have so made such payment in full to the Agent,
each Lender shall repay to the Agent forthwith on demand such amount distributed
to such Lender, together with interest thereon, for each day from the date such
amount is distributed to such Lender until the date such Lender repays such
amount to the Agent, at the Federal Funds Rate until (and including) the third
Business Day after demand is made and thereafter at the Base Rate.

          (e) Subject to Section 3.03, payments of Loans shall be applied first
to pay Base Rate Loans and then to pay Eurodollar Rate Loans in the order that
the Interest Periods for such Eurodollar Rate Loans end.  All amounts shall be
paid on the date specified therefor, whether or not such payment would require a
payment of any Eurodollar Rate Loans prior to the last day of the applicable
Interest Periods therefor or would result in losses, costs or expenses
compensable under Section 3.04.

          Section 3.02  Mandatory Prepayments. (a) Permitted Replacement Debt.
Within one Business Day after the receipt by the Borrower of the Net Proceeds of
any Permitted Replacement Debt, the Borrower shall prepay the Loans in an
aggregate principal amount equal to such Net Proceeds, together with accrued and
unpaid interest to the date of such prepayment on the principal amount prepaid,
whereupon the Total Commitment shall be permanently reduced ratably by the
amount of such prepayment.

          (b) Post-In-Service Date Contributions.  Within one Business Day after
the receipt by the Borrower of any Post-In-Service Date Contribution, the
Borrower shall prepay the Loans in an aggregate principal amount equal to such
Post-In-Service Date Contribution, together with accrued and unpaid interest to
the date of such prepayment on the principal amount prepaid, whereupon the Total
Commitment shall be permanently reduced ratably by the amount of such
prepayment.

          (c) Other Mandatory Prepayments.  If at any time the aggregate
outstanding principal amount of the Loans exceeds the Total Commitment then in
effect, then the Borrower 

                                       29
<PAGE>
 
shall immediately pay to the Agent for the ratable account of the Lenders the
amount of such excess, together with accrued and unpaid interest to the date of
such prepayment on the principal amount prepaid.

          Section 3.03  Voluntary Prepayments.  The Borrower may, on at least
one Business Day's notice to the Agent stating the proposed date and aggregate
principal amount of the prepayment and the Type of Loans to be prepaid, prepay,
without premium or penalty, the outstanding principal amounts of such Loans
comprising part of the same Borrowing, in whole or ratably in part, together
with accrued and unpaid interest to the date of such prepayment on the principal
amount prepaid, whereupon the Total Commitment shall be permanently reduced
ratably by the amount of such prepayment.  Such notice shall be irrevocable and
the payment amount specified in such notice shall be due and payable on the
prepayment date described in such notice, together with accrued and unpaid
interest on the amount prepaid.  Partial prepayments of Loans shall be in an
aggregate principal amount equal to the lesser of (a) $1,000,000 or an integral
multiple of $100,000 in excess thereof and (b) the aggregate outstanding
principal amount of such Loans; provided, that these limitations do not apply to
any prepayment made pursuant to Section 7.04(b).

          Section 3.04  Funding Losses Relating to Eurodollar Rate Loans. (a) If
any payment of principal of, or any Conversion of, any Eurodollar Rate Loan is
made other than on the last day of an Interest Period relating to such Loan, as
a result of a payment pursuant to Section 3.02 or 3.03, a Conversion pursuant to
Section 2.06, an acceleration of the maturity of any Note in accordance with the
terms hereof, or for any other reason, the Borrower shall, upon demand by any
Lender, pay to such Lender at its Eurodollar Lending Office any amounts required
to compensate such Lender for any losses or reasonable expenses which it may
actually incur by reason of the liquidation or reemployment of the amounts so
prepaid or of deposits or other funds acquired by such Lender to fund or
maintain such Loan.  In any such case, such loss and reasonable expense shall be
equal to the sum, without duplication of amounts, of (i) the costs
and expenses incurred (other than loss of the Applicable Margin) in connection
with, or by reason of, any such event and (ii) an amount equal to the excess, if
any, as reasonably determined by such Lender of (A) the amount of interest which
would have accrued on the amount so paid, Converted or accelerated for the
period from the date of such payment, Conversion or acceleration to the last day
of the Interest Period for such Loan at the Adjusted Eurodollar Rate (minus the
Applicable Margin) applicable to such Loan over (B) the amount of interest, as
reasonably determined by such Lender, which would have accrued to such Lender on
such amount by placing such amount on deposit for a comparable period with prime
banks in the London interbank market.

          (b) The Borrower shall indemnify each Lender against any loss or
reasonable expense incurred by such Lender as a result of (i) any failure by the
Borrower to fulfill on the date of any proposed Borrowing of or Conversion into
a Eurodollar Rate Loan the applicable conditions set forth in Article IV or (ii)
any failure by the Borrower to make a Borrowing of or Conversion into a
Eurodollar Rate Loan after the Borrower has given a notice requesting the same
in accordance with the provisions hereof.  In any such case, such loss and
reasonable 

                                       30
<PAGE>
 
expense shall be equal to the sum, without duplication of amounts, of (i) the
costs and expenses incurred (other than loss of the Applicable Margin) by such
Lender by reason of the liquidation or reemployment of deposits or other funds
acquired by such Lender to effect or maintain such Eurodollar Rate Loan in
connection with, or by reason of, any such event and (ii) an amount equal to the
excess, if any, as reasonably determined by such Lender of (A) the amount of
interest which would have accrued on the amount of the Eurodollar Rate Loan that
was to have been made or into which another Loan was to have been Converted for
the period from the date such Borrowing or Conversion was to have been made to
the last day of the Interest Period for such Loan that would have commenced on
such date at the Adjusted Eurodollar Rate (minus the Applicable Margin)
applicable to such Loan over (B) the amount of interest, as reasonably
determined by such Lender, which would have accrued to such Lender on such
amount by placing such amount on deposit for a comparable period with prime
banks in the London interbank market.

          (c) Any Lender demanding payment pursuant to this Section 3.04 shall
deliver to the Borrower a statement reasonably setting forth the amount and
manner of determining the loss or expense for which such demand is made, which
statement shall be conclusive, absent manifest error.

          Section 3.05 Increased Costs; Capital Adequacy. (a) If after the date
of this Agreement any change in any applicable Governmental Requirement
(including, without limitation, the adoption of any new Governmental
Requirement) or in the interpretation or administration thereof by any central
bank or comparable agency or any other Governmental Authority charged with the
interpretation or administration thereof (whether or not having the force of
law) shall impose, modify or deem applicable any reserve, special deposit or
similar requirement against assets of, deposits with or for the account of or
credit extended by any Lender (except any such reserve requirement that is
reflected in the Eurodollar Rate Reserve Percentage), or shall impose on such
Lender or the London interbank market any other condition affecting this
Agreement or Eurodollar Loans made by such Lender, and the result of any of the
foregoing shall be to increase the cost to such Lender of making or maintaining
any Eurodollar Loan or to reduce the amount of any sum received or receivable by
such Lender hereunder (whether of principal, interest, fees or otherwise) by an
amount reasonably determined by such Lender to be material, then the Borrower
will pay to such Lender, following receipt of a notice from such Lender to such
effect, such additional amount or amounts as will compensate such Lender for
such additional costs incurred or reduction suffered.

          (b) If any Lender shall have determined that (i) the adoption after
the date of this Agreement of any Governmental Requirement, guideline or
directive regarding capital adequacy, (ii) any change after the date of this
Agreement in any such Governmental Requirement, guideline or directive or in the
interpretation or administration thereof after the date of this Agreement by any
central bank or comparable agency or any other Governmental Authority charged
with the interpretation or administration thereof or (iii) compliance by any
Lender (or any lending office of such Lender) or any Lender's holding company
with any request or directive regarding capital adequacy issued after the date
of this Agreement under any 

                                       31
<PAGE>
 
Governmental Requirement or guideline (whether or not having the force of law)
of any Governmental Authority has or would have the effect of reducing the rate
of return on such Lender's capital or on the capital of such Lender's holding
company, if any, as a consequence of this Agreement, the Commitment of such
Lender or the Loans made by such Lender to a level below that which such Lender
or such Lender's holding company could have achieved but for such applicability,
adoption, change or compliance (taking into consideration such Lender's policies
and the policies of such Lender's holding company with respect to capital
adequacy) by an amount reasonably determined by such Lender to be material, then
from time to time the Borrower will pay to such Lender, following receipt of a
notice from such Lender to such effect, such additional amount or amounts as
shall compensate such Lender or such Lender's holding company for any such
reduction suffered.

          (c) Any Lender requiring payment under this Section 3.05 shall deliver
to the Borrower a statement reasonably setting forth the amount and manner of
determination thereof, which statement shall be conclusive, absent manifest
error.

          (d) Each Lender will promptly notify the Borrower of any event
occurring after the date of this Agreement of which it has knowledge which will
entitle such Lender to compensation pursuant to this Section 3.05 and will
designate a different Lending Office if such designation will avoid the need
for, or reduce the amount of, such compensation and will not, in the judgment of
such Lender, be otherwise disadvantageous to such Lender.

          Section 3.06  Taxes. (a) Any and all payments by the Borrower of the
Obligations shall be made free and clear of and without deduction for any and
all present or future Taxes.  If the Borrower shall be required by any
Governmental Requirement to deduct any Taxes from or in respect of any sum
payable hereunder to any Lender, any Co-Agent or the Agent, (i) the sum payable
by the Borrower shall be increased by the amount necessary so that, after making
all required deductions (including, without limitation, deductions applicable to
additional sums payable under this Section 3.06), such Lender, such Co-Agent or
the Agent (as the case may be) receives an amount equal to the sum it would have
received had no such deductions been made, (ii) the Borrower shall make such
deductions and (iii) the Borrower shall pay the full amount deducted to the
relevant taxing authority or other authority in accordance with applicable
Governmental Requirements.

          (b) In addition, the Borrower shall pay any and all present and future
transfer, documentary, stamp and similar Taxes, any and all other excise and
property Taxes, charges and similar levies and all recording and filing Taxes
and fees which arise from any payment made hereunder or from the execution,
delivery or registration of, or otherwise with respect to, this Agreement or any
other Loan Document (hereinafter referred to as "Other Taxes").

          (c) The Borrower shall indemnify each Lender, each Co-Agent and the
Agent for the full amount of Taxes and Other Taxes (including, without
limitation, any Taxes or Other Taxes imposed by any jurisdiction on amounts
payable under this Section 3.06) paid by such Lender, such Co-Agent or the Agent
(as the case may be) and all liabilities (including penalties, 

                                       32
<PAGE>
 
additions to tax, interest and expenses) arising therefrom or with respect
thereto, whether or not such Taxes or Other Taxes were correctly or legally
asserted, INCLUDING PENALTIES, ADDITIONS TO TAX, INTEREST AND EXPENSES ARISING
AS A RESULT OF THE NEGLIGENCE (WHETHER SOLE, JOINT OR CONCURRENT, ACTIVE OR
PASSIVE) ON THE PART OF SUCH LENDER, SUCH CO-AGENT OR THE AGENT, but excluding
penalties, additions to tax, interest and expenses arising as a result of the
gross negligence or willful misconduct on the part of such Lender, such Co-Agent
or the Agent. Payments in respect of the foregoing indemnification shall be made
by the Borrower within five days after the date such Lender, such Co-Agent or
the Agent (as the case may be) makes demand therefor.

          (d) Within 30 days after the date of any payment of Taxes by the
Borrower pursuant to this Section 3.06, the Borrower shall furnish to the
Lenders, the Co-Agents and the Agent the original or a certified copy of a
receipt evidencing payment thereof.  If the Borrower makes any payment in
respect of any Obligation from any account located outside the United States or
any such payment is made by a payor that is not a United States Person and if no
Taxes are payable in respect of such payment, the Borrower shall furnish to the
Lenders and the Agent a certificate from each appropriate taxing authority, or
an opinion of counsel acceptable to the Agent, in either case stating that such
payment is exempt from or not subject to Taxes.  For purposes of this Section
3.06, the terms "United States" and "United States Person" shall have the
meanings set forth in Section 7701 of the Code.

          (e) Each Lender that is not a United States Person hereby agrees that:

          (i) it shall, no later than the date of this Agreement (or, if such
     Lender becomes a party hereto pursuant to Section 3.07 or 10.06, the date
     upon which such Lender becomes a party hereto), deliver to the Borrower
     through the Agent, with a copy to the Agent (A) if any Lending Office is
     located in the United States of America, two accurate and complete signed
     originals of Internal Revenue Service Form 4224 or any successor thereto
     ("Form 4224"), (B) if any Lending Office is located outside the United
     States of America, two accurate and complete signed originals of Internal
     Revenue Service Form 1001 or any successor thereto ("Form 1001"), or (C) if
     such Lender is claiming exemption from withholding of United States federal
     income tax under Section 871(h) or 881(c) of the Code with respect to
     "portfolio interest," a Form W-8 or any successor thereto ("Form W-8")
     (and, if such Lender delivers a Form W-8, a certificate representing that
     such Lender (1) is not a bank for purposes of Section 881(c) of the Code,
     is not subject to regulatory or other legal requirements as a bank in any
     jurisdiction, has not been treated as a bank for purposes of any tax,
     securities law or other filing or submission made to any governmental
     authority, any application made to a rating agency or qualification for any
     exemption from tax, securities law or other legal requirements, (2) is not
     a 10-percent shareholder (within the meaning of Section 871(h)(3)(B) of the
     Code) of the Borrower and (3) is not a controlled foreign corporation
     related to the Borrower (within the meaning of Section 864(d)(4) of the
     Code)), in each case indicating that such Lender is on the date of delivery
     thereof entitled to receive payments of

                                       33
<PAGE>
 
     principal, interest and fees for the account of such Lending Office or
     Lending Offices under this Agreement free from withholding of United States
     federal income tax;

          (ii) if at any time such Lender changes any Lending Office or selects
     an additional Lending Office, it shall, at the same time or reasonably
     promptly thereafter but only to the extent the forms previously delivered
     by it hereunder are no longer effective, deliver to the Borrower through
     the Agent, with a copy to the Agent, in replacement for the forms
     previously delivered by it hereunder, two accurate and complete signed
     originals of Form 4224 or Form 1001, as applicable, or a Form W-8, in each
     case indicating that such Lender is on the date of delivery thereof
     entitled to receive payments of principal, interest and fees for the
     account of such changed or additional Lending Office under this Agreement
     free from withholding of United States federal income tax;

          (iii)  it shall, before or promptly after the occurrence of any event
     (including the passing of time, but excluding any event mentioned in clause
     (ii) above) requiring a change in the most recent forms or form previously
     delivered by such Lender pursuant to this Section 3.06(e) and if the
     delivery of the same be lawful, deliver to the Borrower through the Agent,
     with a copy to the Agent, two accurate and complete original signed copies
     of Form 4224 or Form 1001, as applicable, or a Form W-8 in replacement for
     the forms or form previously delivered by such Lender; and

          (iv) it shall, reasonably promptly upon the reasonable request of the
     Borrower to that effect, deliver to the Borrower through the Agent such
     other forms or similar documentation as may be required from time to time
     by any applicable Governmental Requirement, treaty, rule or regulation in
     order to establish such Lender's tax status for withholding purposes.

          (f) The obligations of the Borrower contained in this Section 3.06
shall survive the termination of this Agreement and the payment in full of the
Obligations.

          Section 3.07  Substitution of Lender.  If (a) the obligation of any
Lender to make or Convert Loans into Eurodollar Loans has been suspended
pursuant to Section 2.05(b), (b) any Lender has demanded compensation under
Section 3.05 or (c) any Lender has notified the Borrower that it is not capable
of receiving payments without deduction or withholding pursuant to Section 3.06,
the Borrower may replace such Lender by designating in a notice given to the
Agent an Eligible Assignee to replace such Lender.  If the Borrower so
designates an Eligible Assignee, then the Agent shall give notice thereof to the
Lender to be replaced, and thereupon, such Lender shall promptly consummate an
assignment of such Lender's Commitment, Loans, Notes and other rights and
obligations hereunder relative to the Commitment of such Lender to such Eligible
Assignee in accordance with Section 10.06.  For purposes of Section 3.04(a), a
Lender consummating an assignment pursuant to this Section 3.07 shall be deemed
to have been paid on the effective date of such assignment all its Eurodollar
Rate Loans then being assigned.

                                       34
<PAGE>
 
                                  ARTICLE IV.

                        CONDITIONS TO LOANS; CONVERSIONS

          Section 4.01  Conditions to Initial Loans.  The obligation of each
Lender to make its initial Loan is subject to the Agent's receipt on the Closing
Date of each of the following, in sufficient number for each of the Lenders and
the Co-Agents and in form and substance reasonably satisfactory to the Agent:

          (a) a duly executed Note for each Lender, in each case dated as of May
     5, 1995;

          (b) a Secretary's Certificate, dated the Closing Date, in the form of
     Exhibit 4.01(b)-1, to which shall be attached copies of the Charter
     Documents, as amended, modified and supplemented and in effect on the
     Closing Date, of the Borrower, including, in the case of the Regulations,
     an amendment thereto in the form of Exhibit 4.01(b)-2, and resolutions
     evidencing the Owners Committee Action approving and authorizing the
     applicable Loan Documents and the Borrowings hereunder;

          (c) a copy of the Articles of Organization of the Borrower, certified
     as of a Current Date by the Secretary of State of the State of Texas;

          (d) (i) a good standing certificate with respect to the Borrower,
     issued as of a Current Date by the Comptroller of Public Accounts of the
     State of Texas, and (ii) a certificate of existence with respect to the
     Borrower, issued as of a Current Date by the Secretary of State of the
     State of Texas;

          (e) a certificate, issued by the Secretary of State of the State of
     Alabama to the effect that the Borrower is registered as a foreign limited
     liability company under the name "LYONDELL-CITGO Refining Company L.L.C."
     in that State and a certificate issued as a Current Date by such Secretary
     of State which certifies that the Borrower has not filed a certificate of
     cancellation of such registration;

          (f) opinions of counsel for the Borrower, dated the Closing Date, in
     the forms of Exhibits 4.01(f)-1 and 4.01(f)-2;

          (g) a certificate of a Responsible Officer, dated the Closing Date, in
     the form of Exhibit 4.01(g) to the effect, among others, that (i) the
     representations and warranties set forth in Article V are true and correct
     in all material respects as of the Closing Date (unless made as of a
     specific date as set forth therein) and (ii) no Default exists or would
     exist as a result of making a Loan on the Closing Date;

          (h) evidence that, prior to or on the Closing Date:  (i) all
     outstanding Indebtedness and other amounts owing under the Existing Credit
     Agreement have been 

                                       35
<PAGE>
 
     or will be paid and discharged in full; (ii) all commitments to lend and
     issue letters of credit thereunder have been or will be terminated; and
     (iii) any Liens thereunder have been or will be released;

          (i) (i) the results of a recent search of the Uniform Commercial Code
     and tax lien records in (A) the offices of the Secretary of State of the
     State of Texas, the Secretary of State of the State of Alabama and the
     Secretary of State of the Commonwealth of Pennsylvania and (B) the probate
     court in all counties in Alabama in which the Borrower's assets are
     located, which shall reveal no Liens on any of the property or assets of
     the Borrower, or any revenues, income or profits therefrom, except
     Permitted Liens, and shall otherwise be satisfactory to the Agent, and (ii)
     the results of a recent search of the real property records of Harris
     County, Texas, which shall reveal no Liens on the Houston Facility, except
     Permitted Liens, and shall otherwise be satisfactory to the Agent;

          (j) an environmental review in form and substance satisfactory to the
     Agent from Brown & Root, Inc. with respect to environmental permits,
     environmental management and implementation of Order SWR No. 30092 issued
     by the Texas Water Commission on April 30, 1993, which order is now being
     administered by the Texas Natural Resource Conservation Commission;

          (k) a duly executed copy of each Fee Letter and payment of all fees
     and reasonable expenses of the Agent, and fees of the Co-Agents and the
     Lenders that are due and payable on the Closing Date pursuant to this
     Agreement or any other Loan Document;

          (l) evidence that CRIC, as of March 31, 1995, has contributed in cash
     to or for the benefit of the Borrower not less than $217,000,000 of the
     Initial Refinery Expansion Project Contribution, which the Borrower has
     used or segregated or otherwise reserved, set aside or designated for use
     solely to pay Approved Costs;

          (m) a feasibility report prepared by Brown & Root, Inc. regarding the
     plans and specifications for the Refinery Expansion Project;

          (n) a duly executed and delivered agreement between the Borrower and
     the Service Agent to the effect specified in Section 10.08; and

          (o) certified copies of the Contribution Agreement and the Refined
     Products Purchase Agreement and one certified copy, to be held by the Agent
     pursuant to its written safekeeping agreement with the Borrower and
     delivered with such copy, of each of the Crude Supply Agreement and the
     Supplemental Supply Agreement, in each case as amended, modified and
     supplemented and in effect on the Closing Date.

                                       36
<PAGE>
 
          Section 4.02  Conditions to Each Borrowing.  The obligation of any
Lender to make a Loan on the occasion of each Borrowing, including its initial
Loan, is subject to the satisfaction of the following conditions precedent that
on the date of such Borrowing:

          (a) the Agent has received a Notice of Borrowing with respect to such
     Loan in accordance with this Agreement;

          (b) the representations and warranties set forth in Article V (other
     than in Section 5.06(a)(ii)) are true and correct in all material respects
     (unless made as of a specific date as set forth therein);

          (c) no Default exists or would exist as a result of making such Loan
     or the application of the proceeds thereof;

          (d) such Loan will not contravene any Governmental Requirements
     applicable to such Lender; and

          (e) satisfaction of the Agent and such Lender that the proceeds of
     such Loan will be used for purposes not inconsistent with Section 5.13.

          Section 4.03  Conditions to Certain Loans.  The obligation of any
Lender to make its initial Loan is subject to the satisfaction of the condition
precedent that the Agent shall have received, in form and substance reasonably
satisfactory to the Agent, evidence that CRIC has theretofore contributed in
cash to or for the benefit of the Borrower not less than $290,000,000 of the
Initial Refinery Expansion Project Contribution, which the Borrower has used or
segregated or otherwise reserved, set aside or designated for use solely to pay
Approved Costs. The obligation of any Lender to make a Loan on the occasion of
each Borrowing, including its initial Loan, is subject to the satisfaction of
the following additional condition precedent if, after giving effect to such
Borrowing, the total amount outstanding under the Total Commitment exceeds
$200,000,000: the Agent shall have received evidence satisfactory to the Agent
that (i) the Initial Refinery Expansion Project Contribution has been made in
full in cash, (ii) CRIC and LRC have made Owner Refinery Expansion Project
Investments in accordance with Section 6.3 of the Regulations in an aggregate
amount equal to such excess and (iii) the Borrower has used, designated or
segregated or otherwise reserved or set aside for use all proceeds of the
Initial Refinery Expansion Project Contribution and such Owner Refinery
Expansion Project Investments made on or before the date of such Borrowing
solely to pay Approved Costs.

          Section 4.04  Conditions to Conversions.  The obligation of any Lender
to Convert any Loan into a Eurodollar Rate Loan pursuant to a Notice of
Conversion is subject to the satisfaction of the following conditions precedent
that on the date of Conversion:

          (a) the Agent has received a Notice of Conversion in accordance with
     Section 2.06;

                                       37
<PAGE>
 
          (b) the representations and warranties set forth in Article V (other
     than in Sections 5.05 and 5.06(a)(ii)) are true and correct in all material
     respects (unless made as of a specific date as set forth therein);

          (c)  no Default exists; and

          (d) such Conversion will not contravene any Governmental Requirement
     applicable to such Lender.

          Section 4.05  Deemed Fulfilled Conditions.  Except to the extent that
the Borrower has disclosed in the Notice of Borrowing or Notice of Conversion,
as the case may be, or in a subsequent notice given to the Agent prior to 5:00
P.M. (New York City time) on the Business Day before the requested date for the
making of the requested Borrowing or Conversion, that an applicable condition
specified in this Article IV will not be fulfilled as of the requested time for
the making of such Loans or such Conversion, the Borrower shall be deemed to
have made a representation and warranty as of such time that the conditions
specified in such clauses have been fulfilled, except that in no event shall the
Borrower make or be deemed to make any representation or warranty as to Section
4.02(d) or 4.04(d).  No such disclosure by the Borrower that a condition
specified in this Article IV will not be fulfilled as of the requested time for
the making of the requested Loans or effecting the requested Conversion shall
affect the right of each Lender not to make the Loans requested to be made by it
or each Lender not to effect such Conversion if such condition has not been
fulfilled at such time.

                                 ARTICLE V.

                 REPRESENTATIONS AND WARRANTIES OF THE BORROWER

          In order to induce the Agent, each Co-Agent and each Lender to enter
into this Agreement and to make each Loan requested to be made by it, the
Borrower represents and warrants as follows (which representations and
warranties will survive the delivery of any Note and any other Loan Document and
the making of any Loan).

          Section 5.01  Organization; Power; Qualification.  The Borrower (a) is
a limited liability company duly organized, validly existing and in good
standing under the TLLCA and (b) has all requisite power and authority under the
TLLCA and its Charter Documents to own or lease and operate its properties and
to carry on its business as now conducted and as proposed to be conducted.  The
Borrower's Charter Documents reserve management of the Borrower entirely to its
members (as such term is used in the TLLCA).  Each Subsidiary (a) is a limited
liability company or corporation duly organized, validly existing and in good
standing under the laws of the state of its organization and (b) has all
requisite power and authority under the limited liability statute under which it
is organized (or, if it is a corporation, has all requisite corporate power and
authority) to own or lease and operate its properties and to carry on its
business as now conducted and as proposed to be conducted.  The Borrower is, and
each Subsidiary is, duly registered, qualified or licensed and in good standing
as a foreign limited liability company (if 

                                       38
<PAGE>
 
it is a limited liability company) or corporation (if it is a corporation) in
good standing in all jurisdictions in which it owns or leases property or
proposes to own or lease property or in which the carrying on of its business as
now conducted or as proposed to be conducted so requires, except to the extent
that failures to be so registered, qualified or licensed individually or in the
aggregate could not reasonably be expected to have a Material Adverse Effect. As
of the date of this Agreement, (a) Lyondell and CITGO collectively own, directly
or indirectly, 100% of the membership interests of the Borrower and have the
right to vote such interests and to manage the business and affairs of the
Borrower consistent with the terms and provisions of the Regulations and (b) the
Borrower has no Subsidiaries. Each Subsidiary, if any, is a Wholly-Owned
Subsidiary.

          Section 5.02 Authorization; Enforceability; Absence of Conflicts;
Required Consents. The execution, delivery and performance by the Borrower of
this Agreement and each other Loan Document to which it is a party, and the
incurrence of the Indebtedness and other Obligations contemplated hereby and
thereby, are within its power and authority under its Charter Documents and the
TLLCA and have been duly authorized by all proceedings required under its
Charter Documents and the TLLCA. This Agreement and the Notes have been, and
each of the other Loan Documents to which the Borrower is a party when delivered
to the Agent will have been, duly executed and delivered by the Borrower and
are, or when so delivered will be, the legal, valid and binding obligations of
the Borrower, enforceable against the Borrower in accordance with their
respective terms, subject to applicable bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting the enforcement of creditors' rights
generally and general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law). The
execution, delivery and performance in accordance with their respective terms by
the Borrower of the Loan Documents to which it is a party, and the incurrence of
Indebtedness and other Obligations pursuant thereto, do not and will not (a)
violate, breach or constitute a default under (i) the Charter Documents of the
Borrower or any Subsidiary, (ii) any Governmental Requirement applicable to the
Borrower or any Subsidiary or (iii) any other Material Agreement of the Borrower
or any Subsidiary, (b) result in the acceleration or mandatory prepayment of any
Indebtedness of the Borrower or any Subsidiary or afford any holder of any such
Indebtedness the right to require the Borrower or any Subsidiary to redeem,
purchase or otherwise acquire, reacquire or repay any such Indebtedness or (c)
cause or result in the imposition of or afford any Person the right to obtain
any Lien upon any property or assets of the Borrower or any Subsidiary (or upon
any revenues, income or profits of the Borrower or any Subsidiary therefrom). No
Governmental Approvals are required to be obtained, and no reports or notices to
any Governmental Authority are required to be made, by the Borrower for the
execution, delivery or performance by the Borrower of the Loan Documents or the
enforcement against the Borrower of its obligations thereunder or the incurrence
of the Indebtedness and other Obligations by the Borrower pursuant thereto.

          Section 5.03  Compliance With Laws.  Each of the Borrower and the
Subsidiaries (a) possesses, and is in compliance with the terms and conditions
of, all Governmental Approvals necessary for the ownership or lease and
operation of its property and the carrying on of its business as now conducted
or proposed to be conducted, except for such failures to possess and

                                       39
<PAGE>
 
noncompliances that individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect, and (b) is in compliance with all
Governmental Requirements applicable to it or any of its properties or assets,
including, without limitation, all applicable Governmental Requirements under
ERISA and Environmental Laws, except for such noncompliances by the Borrower and
the Subsidiaries that individually or in the aggregate could not reasonably be
expected to have a Material Adverse Effect.

          Section 5.04  No Defaults.  No Default has occurred and is continuing.
Neither the Contribution Agreement nor any Supply or Purchase Contract has been
terminated.

          Section 5.05  Litigation.  There is no Litigation pending or, to the
knowledge of the Borrower, threatened to which the Borrower or any Subsidiary is
or may become a party that (a) questions or involves the validity or
enforceability of any of the Loan Documents, (b) could reasonably be expected to
have a Material Adverse Effect or (c) seeks (or reasonably may be expected to
seek) to rescind, revoke, terminate, cancel, withdraw, suspend, modify or change
adversely or withhold any Material Governmental Approval or any Material
Agreement and in which the remedies sought or expected to be sought, if
obtained, could reasonably be expected, individually or in the aggregate, to
have a Material Adverse Effect.

          Section 5.06  Financial Statements; Disclosure. (a) Financial
Statements.  (i) The Financial Statements (including in each case the related
schedules and notes) delivered to the Agent present fairly, in all material
respects, the consolidated financial position of the Borrower and the
Subsidiaries at the respective dates of the balance sheets included therein and
the consolidated results of their operations and their consolidated cash flows
for the respective periods set forth therein and have been prepared in
accordance with GAAP (subject, in the case of interim financial statements, to
normal year-end adjustments). As of the date of any balance sheet included in
such Financial Statements, neither the Borrower nor any Subsidiary then had any
outstanding Indebtedness to any Person or any Material, individually or in the
aggregate, liabilities of any kind (including contingent obligations, tax
assessments or unusual forward or long-term commitments), or any Material
unrealized or anticipated loss, required to be reflected in such Financial
Statements or in the notes related thereto in accordance with GAAP which were
not so reflected.

          (ii) Since December 31, 1994, no change has occurred in the business,
operations, properties or assets, liabilities, condition (financial or
otherwise) or results of operations of the Borrower that could reasonably be
expected, either alone or together with all other such changes, to have a
Material Adverse Effect.

          (b) Disclosure. (i) As of the date hereof, all Information that has
been made available to the Agent, any Co-Agent or any Lender by or on behalf of
the Borrower prior to the date of this Agreement in connection with the
transactions contemplated by this Agreement is, taken together, true and correct
in all material respects (other than financial budgets and projections) and does
not contain any untrue statement of a material fact or omit to state a 

                                       40
<PAGE>
 
material fact necessary in order to make the statements contained therein not
materially misleading in light of the circumstances under which such statements
were made.

          (ii) All Information that is made available after the date of this
Agreement from time to time to the Agent, any Co-Agent or any Lender by or on
behalf of the Borrower in connection with or pursuant to this Agreement, any
other Loan Document or the transactions  contemplated hereby or thereby will be,
when made available and taken together, true and correct in all material
respects (other than financial budgets and projections) and will not contain any
untrue statement of a material fact or omit to state a material fact necessary
in order to make the statements contained therein not materially misleading in
light of the circumstances under which such statements are made.

          (iii)  All financial budgets and projections that have been or are
hereafter from time to time prepared by or on behalf of the Borrower and made
available to the Agent, any Co-Agent or any Lender pursuant to or in connection
with this Agreement, any other Loan Document or the transactions contemplated
hereby or thereby have been and will be prepared and furnished to the Agent in
good faith and were and will be based on facts and assumptions that are believed
by the management of the Borrower to be reasonable in light of the then current
and foreseeable business conditions of the Borrower and the Subsidiaries and
represented and will represent the Borrower's management's good faith estimate
of the consolidated projected financial performance of the Borrower and the
Subsidiaries based on the information available to the Responsible Officers at
the time so furnished.

          Section 5.07  Taxes.  Each of the Borrower and each Subsidiary have
filed or caused to be filed all Tax returns that are required to have been filed
by or with respect to it in every jurisdiction and have paid all Taxes shown to
be due and payable on such returns and all other Taxes payable by them by
assessment, to the extent such Taxes have become due and payable and before they
have become delinquent, except for (a) any Taxes the amount, applicability or
validity of which is currently being contested in good faith by appropriate
proceedings and with respect to which the Borrower has established adequate
reserves on its books in accordance with GAAP or (b) Taxes, other than Federal
Taxes and Taxes payable to Alabama and Texas Governmental Authorities, to which
this clause (b) does not relate, the nonpayment of which individually or in the
aggregate could not reasonably be expected to have a Material Adverse Effect.
Neither the Borrower nor any Subsidiary is a party to any Tax sharing, Tax
allocation or similar agreement except to the extent the Regulations may be
deemed to be such an agreement.

          Section 5.08  Government Regulation.  Neither the Borrower nor any
Subsidiary is (a) an "investment company" or a company "controlled" by an
"investment company," as such terms are defined in the Investment Company Act of
1940, (b) a "holding company" or a "subsidiary" or an "affiliate" of a "holding
company" or a "public utility," as such terms are defined in the Public Utility
Holding Company Act of 1935, or (c) subject to any Governmental Requirement that
regulates or otherwise limits its ability to issue promissory notes or
securities 

                                       41
<PAGE>
 
(other than the Securities Act of 1933, the Trust Indenture Act of 1939 and
state "blue sky" laws) or (in the case of the Borrower) to perform its
obligations under the Loan Documents.

          Section 5.09  Employee Benefit Plans.  (a) Neither the Borrower nor
any ERISA Affiliate of the Borrower has incurred or is reasonably expected to
incur any withdrawal liability under ERISA to, or with respect to, any
Multiemployer Benefit Plan; the execution and delivery of this Agreement, the
consummation of the transactions contemplated by this Agreement and the lending
of funds pursuant to the provisions of this Agreement will not involve any
Prohibited Transaction; no Benefit Plan established or maintained by the
Borrower or any ERISA Affiliate of the Borrower, or to which the Borrower or any
ERISA Affiliate of the Borrower has made contributions, had an Accumulated
Funding Deficiency, whether or not waived, as of the last day of the most
recently ended plan year of such Benefit Plan; no liability, individually or in
the aggregate, to the PBGC (other than required insurance premiums, all of which
that have become due have been paid) has been incurred and not satisfied in full
by the Borrower or any ERISA Affiliate of the Borrower with respect to any
Benefit Plan; and no event or condition has occurred, or is reasonably expected
to occur, which presents a material risk of the termination of any Benefit Plan
under circumstances which could result in a material liability to the Borrower,
directly or indirectly or as a result of the liability of a current or former
ERISA Affiliate of the Borrower; provided, however, for purposes of this Section
5.09(a), a liability shall be considered material at any time if it could
reasonably be expected, individually or in the aggregate with all other such
liabilities, to result in a Material Adverse Effect.

          (b) No Lien in favor of a Benefit Plan, a Welfare Plan, any
Multiemployer Benefit Plan or the PBGC exists upon any property or assets of the
Borrower or any Subsidiary or upon any revenues, income or profits of the
Borrower or any Subsidiary therefrom nor to the knowledge of any Responsible
Officer has there been any occurrence with respect to any such plan that, with
or without the passage of time, could reasonably be expected to have a Material
Adverse Effect.

          (c) In each case, assuming that the provisions of PL 103-465, the
General Agreement on Tariffs and Trade ("GATT"), were currently in effect, (i)
no Benefit Plan established or maintained by the Borrower or any ERISA Affiliate
of the Borrower would have a "liquidity shortfall" within the meaning of Section
302(c)(5) of ERISA, (ii) the liabilities of any such Benefit Plan, determined on
each of an ongoing and a termination basis, would not be increased, (iii) no
additional PBGC premiums relating to any such Benefit Plan would be required,
(iv) the minimum contribution obligations with respect to any such Benefit Plan
would not be increased solely by reason of the application of the provisions of
GATT, (v) no Lien upon any property or assets of the Borrower or any Subsidiary
(or upon any revenues, income or profits of the Borrower or any Subsidiary
therefrom) would be imposed with respect to obligations and responsibilities to
any such Benefit Plan and (vi) no notice to participants with respect to a level
of funding in any such Benefit Plan would be required.

          Section 5.10  Title to Property; Leases.  In each case, free and clear
of all Liens except for Permitted Liens, the Borrower has (a) good and
indefeasible fee simple title to the 

                                       42
<PAGE>
 
Houston Facility and the Birmingport Facility and good and valid title to the
"Ballpark" (the preceding and following quoted terms having the meanings given
them by the Contribution Agreement as in effect on the date of this Agreement)
and (b) sufficient title to the "Company Pipelines" and the "Easements" to
enable the Borrower to use the Company Pipelines and Easements as the same were
used by Lyondell immediately prior to July 1, 1993, and as the same have been
used by the Borrower immediately prior to the date of this Agreement and as they
are intended as of the date of this Agreement to be used by the Borrower after
such date in the operation of the Refinery in a manner consistent with the
Borrower's past practices, and any defect in title to any portion of the Company
Pipelines and the Easements will not or could not reasonably be expected to have
a Material Adverse Effect. In each case, free and clear of all Liens except for
Permitted Liens, the Borrower has good and valid title to all its other tangible
properties and assets that individually or in the aggregate are Material, and
each Subsidiary has good and valid title to all its tangible properties and
assets that individually or in the aggregate with the tangible properties and
assets purported to be owned by all Subsidiaries are Material. All leases of
property or assets by the Borrower and the Subsidiaries which individually or in
the aggregate are Material are valid and subsisting and in full force and
effect, the Borrower and the Subsidiaries enjoy the quiet and undisturbed
possession of such properties and assets and no default exists under such
leases, except for such lack of such enjoyment and defaults that individually or
in the aggregate could not reasonably be expected to have a Material Adverse
Effect.

          Section 5.11 Labor Matters. There are no strikes, work stoppages,
slowdowns or lockouts pending or, to the knowledge of the Borrower, threatened
against or involving the Borrower or any Subsidiary, other than those that
individually or in the aggregate could not reasonably be expected to have a
Material Adverse Effect.

          Section 5.12  Intellectual Property.  The Borrower owns or possesses
the right to use, and each Subsidiary owns or possesses the right to use, all
Intellectual Property necessary to the conduct of its business as now conducted
or proposed to be conducted, in each case free of any claims or infringements
known to the Borrower, except for claims and infringements that individually or
in the aggregate could not reasonably be expected to have a Material Adverse
Effect.

          Section 5.13  Use of Proceeds.  The Borrower will use the proceeds of
the Loans solely for the payment of Approved Costs.  None of the proceeds of the
Loans will be used to purchase or carry (or refinance any borrowing the proceeds
of which were used to purchase or carry) any "margin stock" within the meaning
of Regulation G, T, U or X.  Neither the Borrower nor any Subsidiary owns any
margin stock.  The Borrower does not intend to apply, nor will it apply, any
part of the proceeds of any Loan in any manner or to any purpose that is
unlawful or would involve a violation of any Governmental Requirement relating
to the use of funds applicable to the Borrower or the transactions contemplated
by the Loan Documents, including, without limitation, Regulation G, T, U or X.

                                       43
<PAGE>
 
                                  ARTICLE VI.

                      FINANCIAL STATEMENTS AND INFORMATION

          So long as any of the Commitments remain in effect and until payment
in full of the Loans and all other Obligations that have become due when the
Loans have been paid in full, unless compliance with the provisions of the
following Sections shall have been waived in writing by the Required Lenders,
the Borrower agrees as follows.

          Section 6.01 Reporting Requirements. The Borrower will furnish to the
Agent:

          (a) Quarterly Financial Statements.  As soon as available and in any
     event within 60 days after the end of each of the first three fiscal
     quarters of each of its fiscal years:

          (i) a consolidated balance sheet of the Borrower and the Subsidiaries
     as of the end of such fiscal quarter, the related consolidated statements
     of income or operations and of cash flows for such fiscal quarter and for
     the portion of the fiscal year ended with such quarter, setting forth in
     each case in comparative form the figures for the corresponding quarter and
     the corresponding portion of the Borrower's previous fiscal year, and the
     notes related thereto, prepared in accordance with GAAP (subject to normal
     year-end adjustments); and

          (ii) a certificate with respect thereto of the Chief Financial
     Officer, the Controller or the Manager, Finance of the Borrower in the form
     of Exhibit 6.01(a);

          (b) Annual Financial Statements.  As soon as available and in any
     event within 120 days after the end of each of its fiscal years, commencing
     with the fiscal year ended December 31, 1994:

          (i) a consolidated balance sheet of the Borrower and the Subsidiaries
     as of the end of such fiscal year, the related consolidated statements of
     income or operations and of cash flows for such fiscal year, setting forth
     in each case in comparative form the figures for the previous fiscal year,
     and the notes related thereto, prepared in accordance with GAAP;

          (ii) the audit report of Coopers & Lybrand, or another nationally
     recognized firm of independent certified public accountants, on such
     consolidated financial statements, which report shall be unqualified and
     state that in the opinion of such accountants such consolidated financial
     statements present fairly, in all material respects, the consolidated
     financial position and results of operations and cash flows of the Borrower
     and the Subsidiaries at the dates and for the periods covered in such
     financial statements and have been prepared in conformity with GAAP and
     that the examination of such accountants in connection with such financial
     statements has been made in 

                                       44
<PAGE>
 
     accordance with generally accepted auditing standards, and that such audit
     provides a reasonable basis for such opinion under the circumstances; and

          (iii)  a certificate of the Chief Financial Officer, the Controller or
     the Manager, Finance of the Borrower in the form of Exhibit 6.01(b);
 
          (c) Refinery Expansion Project Progress Report.  Monthly through the
     month following the In-Service Date, a Refinery Expansion Project progress
     report within 30 days after the month to which the report relates,
     presenting in reasonable detail to the reasonable satisfaction of the Agent
     the status of the construction and completion of the Refinery Expansion
     Project;

          (d) Notices and Information.  Promptly and in any event:

          (i) within five Business Days after (A) the approval by the Owners
     Committee of any budget of any type contemplated by Section 9.2 of the
     Regulations as in effect on the date of this Agreement, or any amendment of
     or supplement to any such budget, a copy of that budget, amendment or
     supplement, (B) the beginning of any fiscal year, if the Owners Committee
     has not approved for such fiscal year any budget of any type contemplated
     by Section 9.2 of the Regulations as in effect on the date of this
     Agreement before the beginning of such fiscal year, a copy of (1) the
     proposed budget in the form most recently submitted to the Owners Committee
     for approval and (2) if such budget is the operating budget, the budget or
     other plan pursuant to which the Borrower is then conducting operations,
     and (C) the sending to the Owners Committee of any business plan of the
     type contemplated by Section 9.6 of the Regulations as in effect on the
     date of this Agreement, a copy of that plan;

          (ii) within five Business Days after the sending or receiving thereof,
     copies of all Material notices and communications sent by the Borrower or
     any Subsidiary to, or received by the Borrower or any Subsidiary from, any
     Governmental Authority, which notices in each case relate to matters that
     have had or could reasonably be expected to have a Material Adverse Effect;

          (iii)  within five Business Days after the sending or receiving
     thereof, copies of all notices of termination or material default sent by
     the Borrower or any Subsidiary to, or received by the Borrower or any
     Subsidiary from, any party to any Material Agreement; and

          (iv) within five Business Days after the effective date thereof, (A)
     copies of all amendments and supplements to and modifications of the
     Borrower's Charter Documents and (B) copies of all amendments and
     supplements to and modifications of any Supply or Purchase Contract;

                                       45
<PAGE>
 
          (e) Defaults; ERISA; Material Adverse Effect.  Promptly and in any
     event within (i) five Business Days after the Borrower has knowledge of a
     Default, written notice of such Default which specifies the nature and
     duration thereof and what action the Borrower has taken, is taking or
     proposes to take with respect thereto, and (ii) within ten Business Days
     after the Borrower has knowledge of (A) the occurrence of any of the events
     described in Section 8.01(g)(i)-(v) whether or not a Default has occurred
     as a result thereof, written notice of such occurrence, (B) any material
     adverse change in the business, operations, properties, assets or
     conditions of the Borrower and the Subsidiaries, written notice of such
     change which specifies the nature thereof, or (C) the occurrence of any
     Reportable Event with respect to a Benefit Plan of the Borrower or any
     ERISA Affiliate of the Borrower, written notice of such Reportable Event
     which specifies the nature thereof;

          (f) Litigation.  Promptly and in any event within five Business Days
     after the Borrower has knowledge of the commencement of any Litigation
     involving the Borrower or any of the Subsidiaries or any of their
     respective property or assets which (i) if adversely determined, could
     reasonably be expected to have a Material Adverse Effect, (ii) questions or
     involves the validity or enforceability of any of the Loan Documents or
     (iii) if adversely determined, could reasonably be expected to result in
     the rescission, revocation, termination, cancellation, withdrawal,
     suspension, adverse modification of or change in or withholding of a
     Material Governmental Approval or any Material Agreement and such
     rescission, revocation, termination, cancellation, withdrawal, suspension,
     modification, change or withholding could reasonably be expected,
     individually or in the aggregate, to have a Material Adverse Effect, notice
     of such Litigation; and

          (g) Requested Information.  Such information regarding the Loan
     Documents, the Loans, the books and records, business, affairs, operations,
     property or assets, liabilities, condition (financial or otherwise) or
     results of operations of the Borrower and the Subsidiaries and other
     information concerning the Borrower and the Subsidiaries as the Agent, any
     Co-Agent or any Lender may from time to time reasonably request.

          Section 6.02  Books and Records.  The Borrower shall and shall cause
each Subsidiary to keep and maintain a system of accounting established and
administered in accordance with sound business practices and keep and maintain
proper books of records and account.

          Section 6.03  Visits, Inspections and Discussions.  Subject to Section
10.04, the Borrower shall and shall cause each Subsidiary to permit
representatives (whether or not officers or employees) of any Lender, from time
to time during the Borrower's normal daytime business hours, as often as may be
reasonably requested and upon reasonable notice, to (a) visit any of the
premises or property of the Borrower or such Subsidiary, (b) during any such
visit, inspect, and verify the amount, character and condition of, any of the
properties or assets of the Borrower or such Subsidiary, (c) during any such
visit, review and make extracts from the books and records 

                                       46
<PAGE>
 
of the Borrower or such Subsidiary, and (d) during any such visit, discuss the
affairs, finances and accounts of the Borrower or such Subsidiary with its
officers, employees or its independent public accountants (and the Borrower
hereby authorizes such accountants to discuss the finances and affairs of the
Borrower and the Subsidiaries); provided, that in the case of any discussions
pursuant to clause (d), a representative of the Borrower designated by a
Responsible Officer must be present, it being understood and agreed by the
Borrower that it will cooperate to cause this condition to be satisfied. Each
Lender will pay the costs incurred by such Lender in exercising its rights under
this Section 6.03; provided, however, that if a Lender exercises its rights
under this Section 6.03 after the occurrence of an Event of Default, then the
Borrower will reimburse such Lender for the reasonable costs incurred by such
Lender in connection therewith promptly after such Lender's request therefor.
Nothing in this Agreement or any other Loan Document does, is intended to or
shall be construed as authorizing the Agent, any Co-Agent or any Lender to
conduct or have conducted for its account or the account of any other Person
after the date of this Agreement any environmental inspection or audit of the
Refinery or the real property on which the Refinery is situated or any other
plant, property or equipment or real property owned or leased by the Borrower on
the date of this Agreement.

                                  ARTICLE VII.

                               CERTAIN COVENANTS

          So long as any of the Commitments remain in effect and until payment
in full of the Loans and all other Obligations that have become due when the
Loans have been paid in full, unless compliance with the provisions of the
following Sections shall have been waived in writing by the Required Lenders,
the Borrower agrees as follows.

          Section 7.01  Maintenance of Existence and Properties. (a) The
Borrower shall and shall cause each Subsidiary that is a limited liability
company when it becomes a Subsidiary to maintain its existence as a limited
liability company under the limited liability company statute under which it was
originally organized.  The Borrower shall cause each Subsidiary that is a
corporation when it becomes a Subsidiary to maintain its existence as a
corporation.  The Borrower shall and shall cause each Subsidiary to (i) be in
good standing in each jurisdiction in which its ownership or lease of properties
or its transaction of business requires it to be registered, qualified or
licensed, except to the extent that failures to be so registered, qualified or
licensed individually or in the aggregate by the Borrower and all Subsidiaries
could not reasonably be expected to have a Material Adverse Effect, and (ii)
keep and maintain all rights, franchises, licenses and privileges useful or
necessary in the conduct of its business, except to the extent that the failure
to keep and maintain such rights, franchises, licenses and privileges
individually or in the aggregate by the Borrower and all Subsidiaries could not
reasonably be expected to have a Material Adverse Effect.

          (b) The Borrower shall and shall cause each Subsidiary to maintain and
preserve all of its properties, owned or leased, that are necessary or useful in
the conduct of its business in good repair, working order and condition,
ordinary wear and tear excepted; provided, 

                                       47
<PAGE>
 
however, that no item of property need be so maintained and preserved if the
failure to so maintain and preserve such item individually or in the aggregate
with all other items not so maintained and preserved by the Borrower and all
Subsidiaries could not reasonably be expected to have a Material Adverse Effect.

          (c) The Borrower shall and shall cause each Subsidiary to maintain and
protect its ownership of or rights to use all Intellectual Property owned or
used by it in the conduct of its business as now conducted and proposed to be
conducted, in each case free of all claims and infringements known to the
Borrower, except for such failure so to maintain and protect that individually
or in the aggregate respecting all Intellectual Property owned or used by the
Borrower and all Subsidiaries could not reasonably be expected to have a
Material Adverse Effect.

          Section 7.02  Compliance With Governmental Requirements. (a) The
Borrower will and will cause each Subsidiary to comply with all applicable
Governmental Requirements and Governmental Approvals, including, without
limitation, Governmental Requirements under ERISA and applicable Environmental
Laws and applicable Governmental Approvals required by applicable Environmental
Laws, except for such noncompliances that individually or in the aggregate could
not reasonably be expected to have a Material Adverse Effect.

          (b) The Borrower shall and shall cause each Subsidiary to maintain a
policy which, in the reasonable business judgment of the Borrower, is reasonably
designed to promote and monitor continued compliance by their respective
operations and properties with applicable Environmental Laws and applicable
Governmental Approvals required by applicable Environmental Laws.

          Section 7.03  Payment of Taxes and Claims.  The Borrower shall and
shall cause each Subsidiary to pay and discharge or cause to be paid and
discharged promptly when due all Taxes imposed upon it or its revenues, income,
profits or capital or in respect of any of its properties or assets before the
same shall become delinquent or in default, as well as all lawful claims for
labor, materials and supplies or otherwise that, if unpaid, might give rise to a
Lien (other than a Permitted Lien) on such properties or assets or any part
thereof; provided, however, that such payment and discharge by such Person shall
not be required with respect to any such Tax or claim so long as the failure to
make such payment and effect such discharge, together with all other failures
then and theretofore permitted by this clause, could not reasonably be expected
to have a Material Adverse Effect.

          Section 7.04  Insurance; Casualty. (a) The Borrower shall and shall
cause each Subsidiary to maintain insurance with financially sound and reputable
insurance companies or associations in such amounts and covering such risks as
is usually carried by Persons engaged in similar businesses and owning similar
properties in the same general areas in which the Borrower or such Subsidiary
operates, including, without limitation, public liability insurance, casualty
insurance against loss or damage to its properties and assets and business
interruption insurance.

                                       48
<PAGE>
 
          (b) In the case of any damage or casualty to any property, plant or
equipment of the Borrower or any Subsidiary, the Borrower will and will cause
such Subsidiary, as determined by the sound business judgment of the Borrower,
to pursue diligently claims available to it under casualty or other applicable
insurance policies (other than business interruption insurance policies)
relating to such property, plant or equipment and shall use the proceeds of such
policies to (i) finance or refinance (through reimbursement of such Person's
treasury or otherwise) in whole or in part the cost of repairing or replacing
such property, plant or equipment promptly and in a good workmanlike manner,
(ii) otherwise reinvest the proceeds in property, plant or equipment for any of
the lubes, aeromatics or refining businesses of the Borrower or, in the case of
proceeds received in respect of the property, plant or equipment of such
Subsidiary, the business of the Borrower or such Subsidiary, or (iii) prepay
Loans pursuant to Section 3.03.

          Section 7.05  Liens.  The Borrower shall not and shall not permit any
Subsidiary to create, assume or permit to exist any Lien on any of its
properties or assets other than Permitted Liens.

          Section 7.06  Restricted Payments.  The Borrower shall not and shall
not permit any Subsidiary to make any Restricted Payment, including any
distribution to the Owners, whether pursuant to or in accordance with Section
7.2, 7.4, 7.5 or 7.6 of the Regulations or otherwise, except:

          (a) so long as no Event of Default exists or would exist after giving
     effect thereto, the Borrower may make distributions to the Owners pursuant
     to and in accordance with Sections 7.2, 7.4, 7.5 and 7.6 of the
     Regulations, including, without limitation, distributions in satisfaction
     of Distribution Debt and advances pursuant to such Section 7.6;

          (b) each Wholly-Owned Subsidiary may make Restricted Payments to the
     Borrower and other Wholly-Owned Subsidiaries;

          (c) the Borrower may make scheduled payments of principal, fees and
     other charges to the holders of Permitted Replacement Debt when due in
     accordance with its terms (including terms of subordination);

          (d) with respect to Qualified Subordinated Debt that is not Permitted
     Replacement Debt:

          (i) if such Indebtedness is owing to LRC pursuant to Section 6.4.(D)
     of the Regulations, the Borrower may make scheduled payments of interest
     thereon so long as no Event of Default exists or would exist after giving
     effect to any such payment;

          (ii) if such Indebtedness is Affiliate Indebtedness of the Borrower
     not owing to LRC pursuant to Section 6.4.(D) of the Regulations, the
     Borrower may make scheduled 

                                       49
<PAGE>
 
     payments of interest thereon when due in accordance with its terms
     (including terms of subordination); and

          (iii)  if such Indebtedness is not Affiliate Indebtedness of the
     Borrower covered by the foregoing clause (i) or (ii), the Borrower may make
     scheduled payments of principal, interest, fees and other charges to the
     holders of such Qualified Subordinated Debt when due in accordance with its
     terms (including terms of subordination); and

          (e) the Borrower may, pursuant to Section 7.4.(B) of the Regulations,
     make deposits (or be deemed to have made deposits) in the Capital Fund (as
     defined in Exhibit 1 to the Regulations) for the account of CRIC.

Nothing in this Section 7.06 restricts the creation of Distribution Debt in
accordance with Section 7.3.(C) of the Regulations.

          Section 7.07  Limitations on Mergers, Etc.  The Borrower shall not and
shall not permit any Subsidiary to merge or consolidate with or into any Person
or convey, transfer, lease or otherwise dispose of all or substantially all of
its properties and assets in a single transaction or series of transactions;
provided, that any Subsidiary may merge or consolidate with or into or transfer
all or substantially all its properties and assets to any other Subsidiary so
long as no Default exists or would exist after giving effect thereto.

          Section 7.08  Disposition of Assets.  The Borrower shall not and shall
not permit any Subsidiary to sell, lease, license, transfer or otherwise dispose
of any of its properties or assets (or any right to receive revenues, proceeds,
income or profits therefrom), except (a) licensing of technology and
dispositions of inventory, in each case in the ordinary course of business, (b)
dispositions of any property not required to be maintained or preserved pursuant
to Section 7.01(b), (c) dispositions of any property or assets by a Subsidiary
to the Borrower or a Subsidiary or loans or advances of funds by the Borrower to
a Subsidiary, (d) any sale or assignment of delinquent accounts receivable or
other trade receivables (or notes evidencing such receivables) to a collection
agency or similar service in the ordinary course of business as now conducted,
(e) Permitted Liens, (f) Restricted Payments permitted by Section 7.06 and (g)
in transactions permitted by Section 7.07.

          Section 7.09  Indebtedness.  The Borrower shall not and shall not
permit any Subsidiary to incur, create, assume or suffer to exist any
Indebtedness, except:

          (a) (i) the Loans and (ii) in an aggregate amount not to exceed
     $100,000,000 at any time outstanding, the Revolving Credit Loans and the
     Revolving Credit Agreement Letter of Credit Obligations;

          (b)  Permitted Replacement Debt;

          (c)  Qualified Subordinated Debt;

                                       50
<PAGE>
 
          (d)  Distribution Debt;

          (e) unsecured Indebtedness of any Subsidiary owing to the Borrower or
     to any other Subsidiary;

          (f) obligations of the Borrower and all Subsidiaries in an aggregate
     amount, without duplication of amounts, not to exceed $5,000,000 at any
     time outstanding in respect of Capital Leases and Indebtedness consisting
     of secured purchase money Indebtedness incurred by the Borrower or any
     Subsidiary in the ordinary course of business;

          (g) obligations in respect of Permitted Interest Rate Protection
     Agreements, other than pursuant to a Guaranty, having a designated notional
     amount not exceeding, at the time entered into, 100% of the Total
     Commitment then in effect, having a maturity not later than the Termination
     Date and providing for regularly scheduled net settlement payments based
     upon nominal interest amounts computed on the basis of fixed or floating
     rates of interest;

          (h) unsecured Indebtedness of the Borrower, in an aggregate amount not
     to exceed $20,000,000 at any time outstanding, incurred to finance "Capital
     Enhancement Projects" (as defined in Section 9.2.(C) of the Regulations) of
     the Borrower in the conduct of the Borrower's business as permitted by
     Section 7.14; and

          (i) additional unsecured Indebtedness of the Borrower, other than
     pursuant to a Guaranty, in an aggregate amount not to exceed $20,000,000 at
     any time outstanding.

          Section 7.10  Transactions With Affiliates.  The Borrower shall not
and shall not permit any Subsidiary to effect any transaction with any Affiliate
of the Borrower except (a) transactions contemplated by the Regulations and the
Supply or Purchase Contracts, (b) transactions permitted by and in accordance
with Sections 5.3 and 5.4 of the Regulations, (c) transactions between or among
the Borrower and any one or more Subsidiaries or between or among Subsidiaries
(except transactions not otherwise permitted by this Article) and (d) any
transaction to the extent not otherwise restricted or prohibited by this Article
on terms that are no less favorable to the Borrower or such Subsidiary, as the
case may be, than would be available in a comparable transaction with a Person
that is not an Affiliate of the Borrower.

          Section 7.11  Limitation on Restrictive Covenants.  The Borrower shall
not and shall not permit any Subsidiary to permit to exist any consensual
restriction limiting the ability (whether by covenant, event of default,
subordination or otherwise) of any Subsidiary to (a) pay dividends or make any
other distributions on its Capital Securities held by the Borrower or any other
Subsidiary, (b) pay any obligation owed to the Borrower or any other Subsidiary,
(c) make any loans or advances to or investments in the Borrower or in any other
Subsidiary, (d) transfer any of its property or assets to the Borrower or any
other Subsidiary, (e) incur any Indebtedness 

                                       51
<PAGE>
 
to the Borrower or (f) create any Lien upon its property or assets whether now
owned or hereafter acquired or upon any revenues, income or profits therefrom.

          Section 7.12  Issuance or Disposition of Capital Securities.  The
Borrower shall not permit any Subsidiary to issue any Capital Securities, and
the Borrower shall not and shall not permit any Subsidiary to sell, transfer or
otherwise dispose of any Capital Securities of any Subsidiary, except (a) any
issuance by a Subsidiary of Capital Securities to the Borrower or a Wholly-Owned
Subsidiary and (b) any disposition by the Borrower or any Subsidiary of any
Capital Securities of a Wholly-Owned Subsidiary to the Borrower or another
Wholly-Owned Subsidiary.

          Section 7.13 Investments. The Borrower shall not and shall not permit
any Subsidiary to purchase or acquire obligations or Capital Securities of, or
any other interest in, or make loans to, or otherwise enter into joint venture
or similar arrangements with, purchase or acquire in a single transaction or
series of transactions all or substantially all of the properties or assets of,
or any business unit of, any Person, except: (a) Permitted Investments; (b)
temporary loans and advances by the Borrower or any Subsidiary to any of its
officers or other employees which are made in the ordinary course of business
for travel, entertainment or other business expenses; (c) current accounts
receivable of the Borrower or any Subsidiary which arise in the ordinary course
of its business and adjustments offered to account debtors (other than
Affiliates of the Borrower) with respect thereto which are made in the ordinary
course of its business; (d) cooperative arrangements entered into by the
Borrower in the ordinary course of its business of operating the Refinery with
other Persons engaged in operations in the Houston Ship Channel area in
connection with their compliance with applicable Governmental Requirements
relating to environmental, health and safety matters, including loans or
advances of funds or equipment to, or acquisitions of the Capital Securities or
the funding of, Gulf Coast Waste Disposal Authority, Clean Channel Association,
Inc. or any similar entity; and (e) acquisitions permitted by Section 7.07.

          Section 7.14  Business.  The Borrower shall not, directly or
indirectly, make any material change in the nature or type of the Borrower's
business as carried on by it as of the date of this Agreement, except such
changes as are contemplated as a result of the Refinery Expansion Project or are
incidental or reasonably related to such business, and the Borrower shall not
permit any Subsidiary to engage in any business other than any type of business
in which the Borrower is permitted to engage under this Section 7.14.

          Section 7.15  Fiscal Year.  The Borrower shall not and shall not
permit any Subsidiary to change its fiscal year from the calendar year.

          Section 7.16  Financial Covenants. (a) Debt to Total Capitalization
Ratio.  The Borrower shall not permit the Debt to Total Capitalization Ratio at
the end of any fiscal quarter of the Borrower to be greater than 0.60 to 1.00.

                                       52
<PAGE>
 
          (b) Coverage Ratio.  The Borrower shall not permit the Coverage Ratio
at the end of any fiscal quarter of the Borrower to be less than 2.00 to 1.00.

          (c) Consolidated Net Worth.  The Borrower shall not permit
Consolidated Net Worth to be less than (a) $375,000,000 at December 31, 1994,
(b) $525,000,000 at December 31, 1995, (c) $535,000,000 at December 31, 1996,
(d) $545,000,000 at December 31, 1997 and (e) $555,000,000 at December 31, 1998
and at each December 31st thereafter.

          (d) Average Debt to EBITDA Ratio.  The Borrower shall not permit the
Average Debt to EBITDA Ratio at the end of any fiscal quarter of the Borrower to
be greater than (i) 4.5 to 1.0 through the fiscal quarter ending September 30,
1997 and (ii) 4.0 to 1.0 for each fiscal quarter ending thereafter.

          Section 7.17  Certain Material Agreements. (a) The Borrower shall not,
and shall not permit any Subsidiary to:

          (i) amend, modify, repudiate, supplement or terminate prior to the
     scheduled termination date (or any effective extension of such date) the
     Crude Supply Agreement or the Refined Products Purchase Agreement, except
     to the extent that any such amendment, modification or supplement, together
     with all previous amendments, modifications and supplements covered by this
     clause (i), could not reasonably be expected to have a Material Adverse
     Effect;

          (ii) without the prior written consent of the Required Lenders (which
     consent shall not be unreasonably withheld), amend, modify or supplement
     any provision of Sections 2.1, 2.3, 2.4, 2.12, 2.13 and 5.7 of the Crude
     Supply Agreement (or any provision of such Sections as incorporated in the
     Supplemental Supply Agreement) in a manner that is detrimental to the
     Borrower or any Subsidiary, other than such amendments or modifications of
     or supplements to such provisions concerning day-to-day performance as are
     customarily waived or modified on a temporary basis in the ordinary course
     of business or pursuant to industry custom or practice; or

          (iii)  without the prior written consent of the Required Lenders
     (which consent shall not be unreasonably withheld), otherwise amend,
     modify, repudiate, supplement or terminate prior to the scheduled
     termination date (or any effective extension of such date) the Supplemental
     Supply Agreement;

provided, that all adjustments contemplated by any Supply or Purchase Contract
as in effect on the date hereof that are made utilizing the methodology, or in
accordance with the parameters, set forth therein (including in any schedules or
exhibits thereto), shall not constitute amendments, modifications or supplements
for purposes of this Section 7.17(a); and provided, further, that any amendments
or modifications of or supplements to the Crude Supply Agreement permitted or
consented to under this Section 7.17(a) shall be deemed to be permitted, and
consented to, amendments, modifications or supplements of the Supplemental
Supply Agreement.

                                       53
<PAGE>
 
          (b) The Borrower shall not amend, modify or supplement its Articles of
Organization, except to the extent that any such amendment, modification or
supplement, together with all previous amendments, modifications and
supplements, could not reasonably be expected to have a Material Adverse Effect.

          (c) The Borrower shall not amend, modify or supplement (i) any of
Sections 2.3.(A), 2.3.(C), 2.3.(D), 5.2, 5.3 or 6.14 of the Contribution
Agreement or Schedule 2.3.(D) to the Contribution Agreement insofar as any such
Section or such Schedule relates to the Lyondell Obligations (it being
understood that if any term defined elsewhere in the Contribution Agreement or
the Schedules or Exhibits to the Contribution Agreement and used (directly or by
inclusion in such a defined term used) in any of such enumerated Sections or
Schedule is amended, modified or supplemented in a manner materially detrimental
to the Lenders with respect to any of such Sections or such Schedule, such
amendment, modification or supplement will be deemed an amendment or
modification of or a supplement to each of the enumerated Sections or Schedule
in which it is used) without the prior written consent of the Required Lenders
(which consent shall not be unreasonably withheld) or (ii) any other term or
condition of the Contribution Agreement in such a manner that the effect
thereof, together with the effect of all previous amendments and modifications
of and supplements to such other terms and conditions, could reasonably be
expected to have a Material Adverse Effect.

          Section 7.18  Use of Proceeds.  The Borrower shall not use or permit
the use of all or any portion of the proceeds of any Loan for any purpose other
than as represented and warranted in Section 5.13.


                                 ARTICLE VIII.

                                    DEFAULT

          Section 8.01  Events of Default.  Each of the following shall
constitute an "Event of Default":

          (a) The Borrower fails to pay any principal of any Note when the same
     becomes due and payable; or the Borrower fails to pay any interest on any
     Note, any fees required by Section 2.04 or any other Loan Document or any
     other Obligation when the same becomes due and payable and such failure
     continues for five days;

          (b) Any representation or warranty made by the Borrower or any of its
     officers in any Loan Document shall prove to have been incorrect or
     misleading in any material respect when made or deemed made pursuant to
     this Agreement;

          (c) The Borrower shall fail to perform or observe: (i) any term,
     covenant, condition or agreement contained in Section 6.01(e), 7.01(a) (as
     to maintenance of existence by the Borrower), 7.02(a) (as to Environmental
     Laws), 7.05 (except as to Liens 

                                       54
<PAGE>
 
     for state and local taxes payable to Governmental Authorities in states
     other than Alabama and Texas), 7.07, 7.08, 7.09 (other than clause (f)
     thereof), 7.10, 7.11, 7.12, 7.14, 7.16, 7.17 or 7.18; (ii) any term,
     covenant, condition or agreement contained in Section 7.06 or 7.13 and such
     failure continues unremedied for a period of five Business Days after the
     earlier to occur of notice of such failure being given to the Borrower by
     the Agent or the Borrower otherwise obtaining knowledge of such failure; or
     (iii) any term, covenant, condition or agreement contained in this
     Agreement or any other Loan Document (other than a term, covenant,
     condition or agreement a failure in the performance or observance of which
     is elsewhere specifically dealt with in this Section 8.01) and such failure
     continues unremedied for a period of 30 days after the earlier to occur of
     notice of such failure being given to the Borrower by the Agent or the
     Borrower otherwise obtaining knowledge of such failure;

          (d) (i) The Borrower or any Subsidiary fails to pay when due any
     principal of or interest on any Indebtedness of such Person (other than the
     Loans) having a then outstanding principal amount in excess of $15,000,000,
     (ii) the maturity of any such Indebtedness, in whole or in part, is
     accelerated, or any such Indebtedness, in whole or in part, is required to
     be prepaid or purchased prior to the stated maturity thereof, in accordance
     with the provisions of any document, instrument or agreement evidencing,
     providing for the creation of or concerning such Indebtedness, or (iii) (A)
     any event has occurred and is continuing that permits (or, with the passage
     of time or the giving of notice or both, would permit) any holder or
     holders of such Indebtedness, any trustee or agent acting on behalf of such
     holder or holders or any other Person to accelerate such maturity or
     require any such prepayment or purchase and (B) if the document, instrument
     or agreement evidencing, providing for the creation of or concerning such
     Indebtedness provides for a grace period for such event, such event is not
     cured prior to the end of such grace period; provided, that this Section
     8.01(d) does not apply to (a) Indebtedness of the type referred to in
     clause (a)(iii) or (iv) of the definition thereof, (b) any liability
     referred to in clause (b) of the definition thereof which does not
     constitute Indebtedness of the type referred to in clause (a)(i) or (ii) of
     the definition thereof or (c) Distribution Debt;

          (e) (i) The Borrower or any Subsidiary (A) makes a general assignment
     for the benefit of creditors, (B) pursuant to or within the meaning of any
     Bankruptcy Law, (1) commences a voluntary case or proceeding or (2)
     consents to the appointment of, or the taking possession by, any Custodian
     of it or any substantial part of its assets, (C) takes any limited
     liability company or corporate action to authorize any of the actions set
     forth above in this Section 8.01(e) or (D) admits in writing its inability
     to pay its debts as they become due or its belief that it will become
     unable generally to pay its debts as they become due; or (ii) (A) an
     involuntary case or proceeding is commenced against the Borrower or any
     Subsidiary under and within the meaning of any Bankruptcy Law and such
     involuntary case or proceeding continues undismissed or unstayed for a
     period of 60 days after it is commenced, (B) a Custodian is appointed of it
     or any substantial part of its assets in any such involuntary case or
     proceeding or (C) an order for relief is entered 

                                       55
<PAGE>
 
     against the Borrower or any Subsidiary in any such involuntary case or
     proceeding; or (iii) any Owner applies to any court of competent
     jurisdiction for the dissolution of the Borrower or an event of dissolution
     (within the meaning of the Regulations or the TLLCA) occurs and the
     business of the Borrower is not continued pursuant to the vote of the
     requisite Owners within 90 days after such event of dissolution or the
     Borrower is not otherwise reconstituted in accordance with Section 12.11 of
     the Regulations within 90 days after such event of dissolution;

          (f) Judgments, orders or decrees are entered against the Borrower or
     any one or more of the Subsidiaries by one or more courts of competent
     jurisdiction the cost of which to the Borrower and the Subsidiaries
     (without duplication of amounts and without including attorney's fees and
     other expenses incurred by the Borrower or any Subsidiary defending against
     or litigating in connection with any such judgment, order or decree)
     aggregates in excess of $15,000,000, and such judgments, orders and decrees
     continue undismissed, unbonded, undischarged or unstayed for a period of 30
     days;

          (g) (i) Any Termination Event occurs with respect to any Benefit Plan
     of the Borrower or any Subsidiary or any of their respective ERISA
     Affiliates, (ii) any Accumulated Funding Deficiency, whether or not waived,
     exists with respect to any such Benefit Plan, (iii) the Borrower, any
     Subsidiary or any of their respective ERISA Affiliates is in "default" (as
     defined in Section 4219(c)(5) of ERISA) with respect to payments owing to
     any Multiemployer Benefit Plan as a result of such Person's complete or
     partial withdrawal (as described in Section 4203 or 4205 of ERISA)
     therefrom, (iv) the Borrower, any Subsidiary or any of their respective
     ERISA Affiliates fails to pay when due an amount that is payable by it to
     the PBGC or to any such Benefit Plan under Title IV of ERISA, (v) a
     proceeding is instituted by a fiduciary of any such Benefit Plan against
     the Borrower, any Subsidiary or any of their respective ERISA Affiliates to
     enforce Section 515 of ERISA and such proceeding has not been dismissed
     within 30 days thereafter, (vi) any Multiemployer Benefit Plan to which the
     Borrower or any of its ERISA Affiliates is or has made or accrued an
     obligation to make contributions shall reorganize or become insolvent or
     (vii) any other event or condition occurs or exists with respect to any
     such Benefit Plan, except that no event or condition referred to in clauses
     (i) through (vii) above shall constitute an Event of Default if it,
     together with all other such events or conditions at the time existing, has
     not subjected and could not reasonably be expected to subject the Borrower
     or any Subsidiary to any liability in excess of $25,000,000 or otherwise,
     alone or in the aggregate, could not reasonably be expected to have a
     Material Adverse Effect;

          (h) The Borrower or any Subsidiary (or any Affiliate of the Borrower)
     institutes any proceedings seeking to establish that any provision of any
     Loan Document is invalid, not binding or unenforceable;

          (i) (i) Any Supply or Purchase Contract is terminated for any reason
     by any party thereto prior to its stated termination date or any effective
     extension of such date, 

                                       56
<PAGE>
 
     or any party to any Supply or Purchase Contract shall fail to perform or
     observe any term, covenant, condition or agreement contained therein to be
     performed or observed by it and such failure, or such failure together with
     all other failures by any party or parties to any such agreements, could
     reasonably be expected to have a Material Adverse Effect; (ii) any other
     Material Agreement is terminated for any reason by any party thereto prior
     to its stated termination date or any effective extension of such date, or
     any party to any such Material Agreement shall fail to perform or observe
     any term, covenant, condition or agreement contained therein to be
     performed or observed by it and such termination or failure, or such
     termination or failure together with all other such terminations and
     failures by any party or parties to any such agreements, could reasonably
     be expected to have a Material Adverse Effect, and such termination or
     failure continues unremedied for a period of 30 days after the earlier to
     occur of notice of such termination or failure being given to the Borrower
     by the Agent or the Borrower otherwise obtaining knowledge of such
     termination or failure; (iii) (A) any of Sections 3.1.(A), 5.3, 5.4,
     6.2.(B), 6.2.(D), 6.2.(E), 6.2.(F), 6.3, 6.4, 6.6, 6.7, 6.8, 7.2, 7.3, 7.4,
     7.5, 7.6, 10.5 and 10.6 of the Regulations is amended, modified or
     supplemented (directly or indirectly by means of an amendment to the
     Borrower's Articles of Organization) (it being understood that if any term
     defined elsewhere in the Regulations or the Exhibits to the Regulations and
     used (directly or by inclusion in such a defined term used) in any of such
     enumerated Sections is amended, modified or supplemented in a manner
     materially detrimental to the Lenders with respect to any of such Sections,
     such amendment, modification or supplement will be deemed an amendment or
     modification of or supplement to each of the enumerated Sections in which
     it is used) without the prior written consent of the Required Lenders
     (which consent shall not be unreasonably withheld) or (B) any other term or
     condition of the Regulations is amended, modified or supplemented (directly
     or indirectly as aforesaid) in such a manner that the effect thereof,
     together with the effect of all previous amendments and modifications of
     and supplements to such other term or conditions, could reasonably be
     expected to have a Material Adverse Effect; (iv) CRIC or LRC fails to pay
     or make any cash contribution or loan to the Borrower required by the
     Regulations and such failure continues unremedied for a period of three
     days; (v) CRIC or LRC materially breaches or violates any other term,
     covenant, condition or agreement contained in the Regulations to be
     performed or observed by it and such breach or violation continues
     unremedied for a period of 90 days after the nondefaulting Owner gives
     written notice thereof to the defaulting Owner pursuant to Section
     12.2.(A)(2) of the Regulations; or (vi) (A) Lyondell fails to perform any
     of the Lyondell Obligations, (B) such failure continues unremedied for a
     period of 90 days after the Borrower or CRIC gives Lyondell written notice
     thereof and (C) such failure, if continued, together with all then
     continuing such failures, could reasonably be expected to have a Material
     Adverse Effect;

          (j)  A Change of Control occurs;

          (k) (i) the Borrower or any ERISA Affiliate of the Borrower does any
     of the following if, individually or in the aggregate, any of the following
     could reasonably be expected to have a Material Adverse Effect: (A) fails
     to make any payments when due 

                                       57
<PAGE>
 
     to any Multiemployer Benefit Plan that the Borrower or such ERISA Affiliate
     of the Borrower is required to make under any agreement relating to such
     Multiemployer Benefit Plan or any Governmental Requirement pertaining
     thereto; (B) incurs withdrawal liability under ERISA to a Multiemployer
     Benefit Plan; (C) voluntarily terminates or, in the case of a "substantial
     employer" as defined in Section 4001(a)(2) of ERISA, withdraws from any
     Benefit Plan or Multiple Employer Plan if such termination or withdrawal
     could reasonably result in the imposition of a Lien upon the properties or
     assets of the Borrower or any Subsidiary (or upon the revenues, income or
     profits of the Borrower or any Subsidiary therefrom) under Section 4068 of
     ERISA; (D) fails to make any required contribution when due to any Plan
     subject to Section 412(n) of the Code that, with the passage of time, could
     result in a Lien upon the properties or assets of the Borrower or any
     Subsidiary (or the revenues, income or profits of the Borrower or any
     Subsidiary therefrom); (E) adopts any amendment to a Benefit Plan the
     effect of which is to increase the "current liability" under the Benefit
     Plan as defined in Section 302(d)(7) of ERISA; (F) incurs any liability to
     the PBGC or to a trustee appointed under Section 4042(b) of ERISA (other
     than required insurance premiums); or (G) acts or fails to act, and, as a
     result thereof, an event similar to any of those referred to in clauses (A)
     through (F) above could occur under the Governmental Requirements of a
     foreign country;

          (ii) the Borrower or any ERISA Affiliate of the Borrower permits the
     present value of all benefits (irrespective of whether vested) under all
     Benefit Plans that have assets less than benefits (irrespective of whether
     vested) to exceed the "current value," as defined in Section 3(26) of
     ERISA, of the assets of such Benefit Plans by an aggregate amount which
     could reasonably be expected to have a Material Adverse Effect;

          (iii)  the Borrower or any ERISA Affiliate does any of the following
     if, in the aggregate, the effect of such actions could reasonably be
     expected to have a Material Adverse Effect: (A) permits to exist any
     Accumulated Funding Deficiency, whether or not waived, with respect to any
     Benefit Plan; (B) applies for or is granted a funding waiver under Section
     302 of ERISA or Section 412 of the Code; (C) permits to occur any
     Reportable Event with respect to any Benefit Plan or Multiple Employer
     Plan, which Reportable Event is likely to result in the termination of such
     Benefit Plan or Multiple Employer Plan for purposes of Title IV of ERISA;
     (D) permits to be filed a notice of intent to terminate a Benefit Plan or
     Multiple Employer Plan under Section 4041(c) of ERISA; or (E) permits a
     complete or partial withdrawal from a Multiemployer Benefit Plan; or

          (l) (i)  LRC shall transfer its interest as a member of the Borrower
     in accordance with the terms of the Regulations to a Person other than an
     "Affiliate" (as defined in the Crude Supply Agreement) of Lyondell or (ii)
     neither CITGO nor any of its "Affiliates" (as defined in the Crude Supply
     Agreement) is a member of the Borrower.

          Section 8.02  Remedies.  During the continuance of any Event of
Default (other than one specified in Section 8.01(e)), the Agent, on notice to
the Borrower, may (but shall not 

                                       58
<PAGE>
 
be obligated to), and if so directed by the Required Lenders shall, do any or
all of the following: (a) declare, in whole or, from time to time, in part, the
Obligations to be, and the Obligations shall thereupon and to that extent
become, due and payable; and (b) terminate, in whole or, from time to time, in
part, the Commitments; provided, however, that during the continuance of an
Event of Default specified in Section 8.01(l), the Agent shall not be entitled
to declare, in whole or in any part, the Obligations to be due and payable, or
to exercise any of the other rights or remedies set forth in this Section 8.02,
solely by reason of such continuance, and none of the Agent, any Co-Agent or any
Lender shall be entitled to exercise any of its rights or remedies under Section
8.04 or 10.02(c) or the proviso to the second sentence of Section 6.03 solely by
reason of such continuance, unless and until the date (the "Supply Termination
Date"), if any, the Borrower receives a written notice of termination of the
Crude Supply Agreement by the "Supplier" (as defined in the Crude Supply
Agreement) pursuant to Section 3.2(c)(iv) or (v) of the Crude Supply Agreement,
as applicable, by reason of the occurrence of such Event of Default; and
provided, further, that any Event of Default specified in Section 8.01(l) which
occurs shall be automatically cured and no longer continuing upon the earlier to
occur prior to the Supply Termination Date, if any, applicable thereto of (i)
receipt by the Borrower of written evidence reasonably satisfactory to the
Required Lenders of such Supplier's waiver of its right to terminate the Crude
Supply Agreement pursuant to Section 3.2(c)(iv) or (v) thereof, as applicable,
by reason of the occurrence of such Event of Default or (ii) the passage of the
90-day period provided under such Section 3.2(c)(iv) or (v), as applicable,
without such Supplier's having delivered such Supplier's notice of termination
of the Crude Supply Agreement by reason of the occurrence of such Event of
Default. Upon the occurrence of an Event of Default specified in Section
8.01(e), automatically and without any notice to the Borrower, (a) the principal
of and accrued and unpaid interest on the Notes and all other Obligations then
owing under the Loan Documents shall be due and payable and (b) the Commitments
shall terminate. Presentment, demand, protest, notice of protest, notice of
default, notice of dishonor, notice of intent to accelerate and all other
notices of any kind (other than the notice provided for in the first sentence of
this Section 8.02) are hereby expressly waived by the Borrower.

          Section 8.03  Application of Proceeds.  During the continuance of any
Event of Default, all payments in respect of the Obligations received by the
Agent may, and shall on the acceleration of the Obligations pursuant to Section
8.01(e), be applied by the Agent to the Obligations, as follows:  (a) first, to
pay interest on and the principal of any portion of any Loan which the Agent has
advanced on behalf of any Lender; (b) second, to pay Obligations in respect of
any fees, expense reimbursements or indemnities then due to the Agent; (c)
third, to pay Obligations in respect of any fees, expense reimbursements or
indemnities then due to the Lenders; (d) fourth, to pay interest due in respect
of the Loans; (e) fifth, to pay or prepay principal outstanding on the Loans;
(f) sixth, to pay all Obligations owed to Lenders in respect of any Interest
Rate Protection Agreements respecting the Loans; and (g) seventh, to pay all
other Obligations, or in such other order and manner as the Agent shall
determine, and the Borrower shall remain liable to the Agent, the Co-Agents and
the Lenders for any deficiency.  If the Agent has funds available to apply to a
portion of, but not all of, one of the amounts described in clauses (a) through
(g) above, then the Agent shall apply such funds to the applicable parties in

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<PAGE>
 
proportion to the amounts to which such parties would have been entitled if the
entire amount described in any such clause had been available.

          Section 8.04  Set-Off; Suspension of Payment and Performance.  The
Agent, each Co-Agent and each Lender is hereby authorized by the Borrower, to
the extent permitted under Governmental Requirements, at any time and from time
to time, without notice, during any Event of Default, to set-off against, and to
appropriate and apply to the payment of, the Obligations owing to such Person
(whether matured or unmatured, fixed or contingent or liquidated or
unliquidated), any and all liabilities owing by such Person to the Borrower
(whether payable in Dollars or any other currency, whether matured or unmatured
and, in the case of liabilities that are deposits, whether general or special,
time or demand and however evidenced and whether maintained at a branch or
office located within or without the United States).  The rights of the Agent,
each Co-Agent and each Lender under this Section 8.04 are in addition to and
cumulative of all other rights and remedies (including, without limitation,
rights pursuant to any banker's lien) which such Person may have.

          Section 8.05 Sharing of Recoveries. The Agent, each Co-Agent and each
Lender agrees that if, for any reason (whether voluntary, involuntary, through
the exercise of any right of set-off or otherwise), such Person receives payment
of a proportion of the aggregate amount of Obligations due and payable to it
hereunder that is greater than its allocable share thereof, then the Person
receiving such proportionately greater payment shall purchase participations
(which it shall be deemed to have done simultaneously upon the receipt of such
payment) in the rights of the applicable Persons hereunder so that all such
recoveries with respect to the Obligations (net of costs of collection) shall be
properly allocated among the Persons entitled to the same; provided, however,
that if all or part of such proportionately greater payment received by the
purchasing Person is thereafter recovered by or on behalf of the Borrower from
such Person, such purchases shall be rescinded and the purchase prices paid for
such participations shall be returned to such Person to the extent of such
recovery, but without interest (unless the purchasing Person is required to pay
interest on the amount recovered to the Person recovering such amount, in which
case the selling Lender shall be required to pay interest at a like rate). The
Borrower expressly consents to the foregoing arrangements and agrees that any
holder of a participation in any rights hereunder so purchased or acquired
pursuant to this Section 8.05 shall, with respect to such participation, to the
extent permitted under Governmental Requirements, be entitled to all of the
rights of a Lender and may exercise any and all rights of set-off with respect
to such participation as fully as though the Borrower were directly indebted to
the holder of such participation for Obligations in the amount of such
participation.

                                  ARTICLE IX.

                                   THE AGENT

          Section 9.01  Appointment and Powers.  Each Lender hereby irrevocably
appoints and authorizes the Agent to act as the agent for such Lender under this
Agreement with such powers as are delegated to the Agent by the terms thereof,
together with such other powers as 

                                       60
<PAGE>
 
are reasonably incidental thereto. The Agent's duties shall be purely
ministerial and the Agent shall have no duties or responsibilities except those
expressly set forth herein. The Agent shall not be required under any
circumstances to take any action that, in its judgment, (a) is contrary to any
provision of the Loan Documents or Governmental Requirements or (b) would expose
it to any liability or expense against which it has not been indemnified to its
satisfaction. The Agent, by reason of its serving as an agent, shall not be a
trustee or other fiduciary for any Lender. The Co-Agents shall have no
responsibilities hereunder in their capacities as Co-Agents.

          Section 9.02 Limitation on Agent's Liability. Neither the Agent nor
any of its directors, officers, employees or agents shall be liable or
responsible to any Co-Agent or any Lender for any action taken or omitted to be
taken by them under or in connection with the Loan Documents, except for its or
their own gross negligence or willful misconduct. The Agent shall not be
responsible to any Co-Agent or any Lender for (a) any recitals, statements,
representations or warranties contained in the Loan Documents or in any
certificate or other document referred to or provided for in, or received by any
Co-Agent or any Lender under, the Loan Documents, (b) the validity,
effectiveness or enforceability of the Loan Documents or any such certificate or
other document or (c) any failure by the Borrower to perform any of its
obligations under the Loan Documents. The Agent may employ agents and attorneys-
in-fact and shall not be responsible to any Co-Agent or any Lender for the
negligence or misconduct of any such agents or attorneys-in-fact so long as the
Agent was not grossly negligent in selecting or directing such agents or
attorneys-in-fact. The Agent shall be entitled to rely upon any certification,
notice or other communication (including any thereof by telephone, telex,
telecopier, telegram or cable) believed by it to be genuine and correct and to
have been signed or given by or on behalf of the proper Person or Persons, and
upon advice and statements of legal counsel, independent accountants or other
experts selected in good faith by the Agent. As to any matters not expressly
provided for by the Loan Documents, the Agent shall in all cases be fully
protected as to the Co-Agents and the Lenders in acting, or in refraining from
acting, under the Loan Documents in accordance with instructions signed by the
Required Lenders, and such instructions of the Required Lenders and any action
taken or failure to act pursuant thereto shall be binding on all of the Lenders.

          Section 9.03  Defaults.  The Agent shall not be deemed to have
knowledge of the occurrence of a Default unless the Agent has received notice
from a Lender or the Borrower specifying such Default and stating that such
notice is a "Notice of Default."  If the Agent receives such a notice of the
occurrence of a Default, then the Agent shall give prompt notice thereof to the
Lenders.  In the event of any Default, the Agent shall take such action with
respect to such Default as shall be directed by the Required Lenders.  Unless
and until the Agent has received such directions, in the event of any Default,
the Agent may (but shall not be obligated to) take such action, or refrain from
taking such action, with respect to such Default as it deems advisable in the
best interests of the Lenders.

          Section 9.04  Rights as a Lender.  The Agent shall, in its capacity as
a Lender, have the same rights and powers under the Loan Documents as any other
Lender and may exercise the same as though it were not acting as the Agent, and
the term "Lender" or "Lenders" 

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<PAGE>
 
shall include such Person in its individual capacity. Each Person acting as the
Agent and its Affiliates may (without having to account therefor to any Lender)
accept deposits from, lend money to and generally engage in any kind of banking,
trust or other business with the Borrower, the Subsidiaries and the Borrower's
Affiliates as if it were not acting as the Agent, and such Person and its
Affiliates may accept fees and other consideration from the Borrower, the
Subsidiaries and the Borrower's Affiliates for services in connection with the
Loan Documents or otherwise without having to account for the same to the
Lenders.

          Section 9.05 Indemnification. The Lenders agree to indemnify the Agent
(to the extent not reimbursed by the Borrower under the Loan Documents), ratably
on the basis of the outstanding Loans of the Lenders (or, if no Loans are at the
time outstanding, ratably on the basis of their respective Commitments), for any
and all liabilities, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements of any kind and nature whatsoever that may be
imposed on, incurred by or asserted against the Agent in its capacity as agent
(including, without limitation, the costs and expenses that the Borrower is
obligated to pay under the Loan Documents) in any way connected with, relating
to or arising out of the Loan Documents or any other documents contemplated
thereby or referred to therein or the transactions contemplated thereby or the
enforcement of any of the terms thereof or of any such other documents, provided
that no Lender shall be liable for any of the foregoing to the extent they arise
from gross negligence or willful misconduct by the Agent. The obligations of the
Lenders under this Section 9.05 shall survive the termination of this Agreement
and the payment in full of the Obligations.

          Section 9.06  Non-Reliance on Agent and Other Lenders.  Each Lender
agrees that it has made and will continue to make, independently and without
reliance on the Agent or any other Lender, and based on such documents and
information as it deems appropriate, its own credit analysis of the Borrower and
the Subsidiaries, and its own decision to enter into the Loan Documents and to
take or refrain from taking any action in connection therewith.  The Agent shall
not be required to keep itself informed as to the performance or observance by
the Borrower of the Loan Documents or any other document referred to or provided
for therein or to inspect the properties or books of the Borrower or any
Subsidiary.  Except for notices, reports and other documents and information
expressly required to be furnished to the Lenders by the Agent under the Loan
Documents, the Agent shall have no obligation to provide any Lender with any
information concerning the business, status or condition of the Borrower or any
Subsidiary or the Loan Documents which may come into the possession of the Agent
or any of its Affiliates.

          Section 9.07  Resignation of the Agent.  Subject to the appointment
and acceptance of a successor Agent as provided below, the Agent may resign at
any time by giving notice thereof to the Lenders and the Borrower.  Upon receipt
of any such notice of resignation, the Required Lenders may, with the consent of
the Borrower (which consent shall not be unreasonably withheld), appoint any
Eligible Assignee as the successor Agent.  If no successor Agent is so appointed
by the Required Lenders and accepts such appointment within 30 days after the
resigning Agent's giving of notice of resignation, then the resigning Agent may,
on behalf of the Lenders and with the consent of the Borrower (which consent
shall not be unreasonably withheld), appoint any Eligible Assignee as the
successor Agent.  Effective on the acceptance by 

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<PAGE>
 
any Person of its appointment as a successor Agent, such Person shall succeed to
and become vested with all the rights, powers, privileges, duties and
obligations of the resigning Agent and the resigning Agent shall be discharged
from its duties and obligations as Agent under the Loan Documents. After any
resigning Agent's resignation as Agent, the provisions of this Article IX shall
continue in effect for its benefit in respect of any actions taken or omitted to
be taken by it while it was acting as the Agent.

          Section 9.08  CERTAIN INTENTIONS.  THE CO-AGENTS AND THE LENDERS
SEVERALLY ACKNOWLEDGE TO THE AGENT THAT THE PROVISIONS OF THIS ARTICLE IX WHICH
RELEASE THE AGENT FROM LIABILITY, LIMIT THE AGENT'S LIABILITY, DUTIES OR
RESPONSIBILITIES OR PROVIDE FOR THE INDEMNIFICATION OF THE AGENT BY THE LENDERS,
INCLUDING, WITHOUT LIMITATION, SECTIONS 9.01, 9.02, 9.03, 9.05 AND 9.06, ARE
INTENDED BY THEM TO SAVE AND HOLD THE AGENT HARMLESS FROM THE CONSEQUENCES OF
ITS OWN NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE OR WILLFUL MISCONDUCT).

                                  ARTICLE X.

                                 MISCELLANEOUS

          Section 10.01    Notices and Deliveries. (a) Manner of Delivery;
Addresses.  All notices, communications and materials (including all
Information) to be given or delivered pursuant to or in connection with the Loan
Documents shall be given or delivered in writing (which shall include telecopier
transmissions) and shall be delivered at the following respective addresses and
telecopier and telephone numbers and to the attention of the following
individuals or departments:

          (i)  if to the Borrower, to it at:

               12000 Lawndale
               Houston, Texas 77252-2451
               Telecopier No.:  (713) 321-6900
               Telephone No.:  (713) 321-5307

               Attention:  Manager, Finance

               with a copy to:

                                       63
<PAGE>
 
               LYONDELL-CITGO
                 Refining Company Ltd.
               12000 Lawndale
               Houston, Texas 77252-2451
               Telecopier No.:  (713) 321-6900
               Telephone No.:  (713) 321-4121

               Attention:  General Counsel

          (ii) if to the Agent, to it at:

               One Wall Street
               18th Floor
               New York, New York 10286
               Telecopier No.:  (212) 635-6365
               Telephone No.:  (212) 635-4693

               Attention:  Kalyani Bose
                         Agency Function Administration

               with a copy to:

               The Bank of New York
               One Wall Street
               19th Floor
               New York, New York 10286
               Telecopier No.:  (212) 635-7293
               Telephone No.:  (212) 635-7834

               Attention:  Ray Palmer

        (iii)  if to any Lender, to it at the address or telecopier number and
               to the attention of the individual or department set forth below
               such Lender's name under the heading "Notice Address" on Annex A
               or, in the case of a Lender that becomes a Lender pursuant to an
               assignment, set forth under the heading "Notice Address" in the
               Assignment Agreement effecting such assignment;

or at such other address or telecopier number or to the attention of such other
individual or department as the party to which such information pertains may
hereafter specify for the purpose in a notice specifically captioned "Notice of
Change of Address" given to each of the other parties to this Agreement.

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<PAGE>
 
          (b) Effectiveness.  Each notice and communication and any material to
be given or delivered pursuant to the Loan Documents shall be deemed so given or
delivered (i) if sent by registered or certified mail, postage prepaid, return
receipt requested, on the third Business Day after such notice, communication or
material, addressed as above provided, is delivered to a United States post
office and a receipt therefor is issued thereby, (ii) if sent by any other means
of physical delivery, when such notice, communication or material is delivered
to the appropriate address as above provided, and (iii) if sent by telecopier,
when such notice, communication or material is transmitted to the appropriate
telecopier number as above provided and is received at such number.

          Section 10.02    Expenses; Indemnification.  Whether or not any Loans
are made hereunder, the Borrower shall, promptly, and in any event within 15
Business Days after receiving a reasonably detailed statement setting forth the
amount and nature thereof:

          (a) to the extent not otherwise paid pursuant to Section 3.06(b), pay
     or reimburse the Agent, each Co-Agent and each Lender for all transfer,
     documentary, stamp and similar taxes, and all recording and filing taxes
     and fees  payable in connection with, arising out of or in any way related
     to, the execution, delivery and performance of the Loan Documents or the
     making of the Loans, excluding any such taxes imposed as a result of the
     assignment (otherwise than pursuant to Section 3.07) of any Loan or portion
     thereof;

          (b) pay or reimburse the Agent for all reasonable out-of-pocket costs
     and expenses (including reasonable fees and disbursements of legal counsel
     collectively retained by the Agent and appraisers, accountants and other
     experts employed or retained collectively by the Agent) incurred by the
     Agent in connection with, arising out of or in any way related to (i) the
     negotiation, preparation, execution and delivery of (A) the Loan Documents
     and (B) whether or not executed and delivered, any waiver or consent
     thereunder, amendment thereof or supplement thereto or, in the case of this
     Agreement, any assignment pursuant to Section 3.07, (ii) the administration
     of and any operations under the Loan Documents, (iii) consulting with
     respect to any matter in any way arising out of, related to or in
     connection with the Loan Documents, including (A) the protection,
     preservation, exercise or enforcement of any of the rights of the Agent,
     the Co-Agents or the Lenders in, under or related to the Loan Documents
     during a Default or (B) the performance of any of the obligations of the
     Agent or the Lenders under or related to the Loan Documents or (iv)
     protecting, preserving, exercising or enforcing any of the rights of the
     Agent or the Lenders in, under or related to the Loan Documents during a
     Default;

          (c) when an Event of Default has occurred and is occurring, pay or
     reimburse each Lender for all reasonable costs and expenses (including
     reasonable fees and disbursements of legal counsel and other experts
     employed or retained by such Lender) at such time incurred by such Lender
     in connection with, arising out of or in any way related to protecting,
     preserving, exercising or enforcing during an Event of Default any of its
     rights in, under or related to the Loan Documents;

                                       65
<PAGE>

 
          (d) (i) indemnify each Indemnified Person against, and hold each
     Indemnified Person harmless from, any and all losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     proceedings, disbursements, costs and expenses of any kind or nature
     whatsoever which may be imposed on, incurred by or asserted against such
     Indemnified Person (including, without limitation, the reasonable fees
     charged and disbursements made by counsel to such Indemnified Person,
     whether or not suit is brought) or to which such Indemnified Person may
     become subject arising out of or in connection with or in any way relating
     to or resulting from any actual or threatened Litigation relating to this
     Agreement (including the use of the proceeds of the Loans), the other Loan
     Documents or any transaction contemplated by any of the foregoing, whether
     or not such Indemnified Person is a party thereto, whether direct or
     indirect, whether based on any federal, state or local law or regulation,
     securities or commercial law or regulation or under common law or in equity
     or on contract, tort or otherwise, and whether or not the transactions
     contemplated hereby are ever consummated, and (ii) reimburse each
     Indemnified Person, on demand, for all out-of-pocket costs and expenses
     (including, without limitation, the reasonable fees and disbursements of
     counsel) incurred in connection with any of the foregoing, including,
     without limitation, costs and expenses incurred in connection with
     investigating, defending or participating in any legal proceeding relating
     to any of the foregoing; provided, however, that the Borrower shall not
     indemnify or hold harmless any Indemnified Person from, or reimburse any
     Indemnified Person for, or waive or release any claim for, any losses,
     claims, damages, liabilities, obligations, penalties, actions, judgments,
     suits, proceedings, disbursements, costs or expenses arising out of the
     gross negligence or willful misconduct of such Indemnified Person;
     PROVIDED, FURTHER, THAT IT IS THE EXPRESS INTENTION OF THE BORROWER TO
     INDEMNIFY EACH INDEMNIFIED PERSON AGAINST THE CONSEQUENCES OF ITS OWN OR
     ANY OTHER INDEMNIFIED PARTY'S NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE),
     WHETHER SUCH NEGLIGENCE BE SOLE, JOINT OR CONCURRENT OR ACTIVE OR PASSIVE.
     The Borrower shall not make any claim against any Indemnified Person for
     any special, indirect or consequential damages in respect of any breach or
     wrongful conduct (whether the claim therefor is based on contract, tort or
     duty imposed by law) in connection with, arising out of or in any way
     related to the transactions contemplated by, and the relationship
     established by, the Loan Documents, or any act, omission or event occurring
     in connection therewith; and the Borrower hereby waives, releases and
     agrees not to sue upon any such claim for any such damages, whether or not
     accrued and whether or not known or suspected to exist in its favor; and

          (e) (i) indemnify each Indemnified Person against, and hold each
     Indemnified Person harmless from, any and all losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     proceedings, disbursements, costs and expenses of any kind or nature
     whatsoever which may at any time be imposed on, incurred by or asserted
     against such Indemnified Person (including, without limitation, the
     reasonable fees charged and disbursements made by counsel to such
     Indemnified Person, whether or not suit is brought) arising out of or in
     connection with or in any way relating to or resulting 

                                       66
<PAGE>
 
     from (A) any Loan Document, including, without limitation, the use of the
     proceeds of the Loans or the relationship created by any Loan Document
     between or among the Borrower and the Agent, the Co-Agents and the Lenders
     and (B), with respect to or as a direct or indirect result of any acts or
     omissions to act by the Borrower or any Subsidiary or any Affiliate of the
     Borrower under any Environmental Law or with respect to or as a direct or
     indirect result of the manufacture, processing, distribution, use,
     treatment, storage, disposal, transport, handling, release, discharge,
     emission or disposal of pollutants, contaminants, chemicals, toxic or
     hazardous substances, industrial or hazardous wastes or noxious noises or
     odors or presence of any of the foregoing on, under, from or about its real
     property; provided, however, that the Borrower shall not indemnify or hold
     harmless any Indemnified Person from, or reimburse any Indemnified Person
     for, or waive or release any claim for, any losses, claims, damages,
     liabilities, obligations, penalties, actions, judgments, suits,
     disbursements, costs or expenses arising out of the gross negligence or
     willful misconduct of such Indemnified Person; PROVIDED, FURTHER, THAT IT
     IS THE EXPRESS INTENTION OF THE BORROWER TO INDEMNIFY EACH INDEMNIFIED
     PERSON AGAINST THE CONSEQUENCES OF ITS OWN OR ANY OTHER INDEMNIFIED
     PERSON'S NEGLIGENCE (OTHER THAN GROSS NEGLIGENCE), WHETHER SUCH NEGLIGENCE
     BE SOLE, JOINT OR CONCURRENT OR ACTIVE OR PASSIVE.

The obligations of the Borrower under this Section 10.02 shall survive the
termination of this Agreement and the payment in full of the Obligations.

          Section 10.03    Rights Cumulative.  Each of the rights and remedies
of the Agent and the Lenders under the Loan Documents shall be in addition to
all of their other rights and remedies under the Loan Documents and Governmental
Requirements, including, without limitation, the Texas Uniform Fraudulent
Transfer Act, and nothing in the Loan Documents shall be construed as limiting
any such rights or remedies.

          Section 10.04    Confidentiality. (a) The Agent, each Co-Agent and
each Lender each agrees that (i) it and its Representatives will keep
confidential all non-public information concerning the Borrower or the Owners
which is furnished to it by or on behalf of the Borrower, the Owners or any of
their respective Representatives ("Confidential Information") and, except with
the specific prior written consent of the Borrower or as otherwise expressly
permitted by the terms of this Section 10.04, will not disclose any Confidential
Information, (ii) it and its Representatives will not use Confidential
Information except for the purposes of this Agreement and the Loans or other
extensions of credit contemplated hereby, (iii) all recipients of Confidential
Information will be informed of the confidential nature of the Confidential
Information and instructed not to make use of the Confidential Information in a
manner inconsistent herewith, (iv) it and its Representatives will not make
available any Confidential Information to other Persons for use or copying and
(v) prior to its disclosure of Confidential Information to any of its Outside
Representatives, such Outside Representative shall have executed and delivered a
written confidentiality agreement for the Borrower's benefit substantially in
the form of Exhibit 10.04(c)-3 in respect of the Confidential Information, an
executed original 

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<PAGE>
 
of which it will provide promptly to the Borrower. Each of the Agent, each Co-
Agent and each Lender further agrees that in all events (i) the Crude Supply
Agreement and the Supplemental Supply Agreement shall be Confidential
Information, (ii) no copies may be made of either such agreement and (iii) any
inspection of either such agreement will be restricted to a limited number of
its Representatives and to the premises of the Borrower or the Agent.

          (b) The term "Confidential Information" does not include information
that any Receiving Party can show (i) has become generally available to the
public other than as a result of disclosure or other fault by a Receiving Party
or its Representatives or (ii) (A) was already in the possession of a Receiving
Party or its Representatives prior to its disclosure to such Person by the
Borrower, an Owner or any of their respective Representatives or (B) became
available to the Receiving Party or its Representatives, in each case under this
clause (ii), free of any restrictions as to its disclosure and from a source,
other than the Borrower, the Owners or any of their respective Representatives,
which to the knowledge of the Receiving Party or the relevant Representative was
not then prohibited from transmitting the information to the Receiving Party or
its Representatives by a contractual, legal, fiduciary or other obligation.

          (c) Each of the Agent, each Co-Agent and each Lender also agrees to
disclose Confidential Information only to (i) its Representatives requiring such
material for the purpose of administering this Agreement and the transactions
contemplated hereby, and (ii) all or any of the Agent, the Co-Agents, the
Lenders, any Prospective Assignees and Prospective Participants; provided,
however, that prior to such disclosure to any Prospective Assignee or
Prospective Participant, a Representative of such Prospective Assignee or
Prospective Participant shall have executed and delivered a written
confidentiality agreement for the Borrower's benefit substantially in the form
of Exhibit 10.04(c)-1 (in the case of any Prospective Assignee) or Exhibit
10.04(c)-2 (in the case of any Prospective Participant) in respect of the
Confidential Information on behalf of such Eligible Assignee, and prior to such
disclosure to any Outside Representative of such Eligible Assignee, such Outside
Representative shall have executed and delivered a written confidentiality
agreement for the Borrower's benefit substantially in the form of Exhibit
10.04(c)-3 in respect of the Confidential Information, and each Lender agrees to
provide promptly to the Borrower an executed original of each such
confidentiality agreement entered into by its Prospective Assignee or
Prospective Participant, as the case may be, and such Person's Outside
Representative, if any.

          (d) The foregoing will not prohibit the disclosure of any Confidential
Information by the Agent, any Co-Agent or any Lender if and to the extent that
(i) such disclosure may be required by any Governmental Authority having
regulatory authority over it, or (ii) it or any of its Representatives may
become legally compelled by court order, subpoena or summons, or by deposition,
interrogatory, request for documents or otherwise in connection with Litigation,
or by similar legal process, including, without limitation, a civil
investigative demand having the same force and effect as a subpoena.  However,
in any event described in clause (ii) above, the Agent, each Co-Agent and each
Lender each agrees that it or its Representatives, as the case may be, prior to
such disclosure will endeavor in good faith (except to the extent prohibited by
any Governmental Requirement from doing so) to provide the 

                                       68
<PAGE>
 
Borrower with prompt notice of such request so that the Borrower may seek an
appropriate protective order or other appropriate remedy or waive compliance
with the provisions of this Section 10.04(d). In the event that such protective
order or other remedy is not obtained, or that the Borrower grants such a waiver
hereunder, the Agent, each Co-Agent and each Lender or its Representatives, as
the case may be, will in all events endeavor in good faith to obtain reliable
assurance that confidential treatment will be accorded any Confidential
Information so furnished.

          (e) The Agent, each Co-Agent and each Lender will only be responsible
for any breach of this Agreement by it or its Representatives, other than its
Outside Representatives who have executed and delivered a written
confidentiality agreement in accordance with this Section 10.04.

          (f) No failure or delay by the Borrower in exercising any right, power
or privilege under this Section 10.04 shall operate as a waiver thereof, nor
shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right, power or privilege under
this Section 10.04.

          Section 10.05 Amendments; Waivers. Any term, covenant, agreement or
condition of this Agreement or the Notes may be amended, and any right
thereunder may be waived, if, but only if, such amendment or waiver is in
writing and is signed by the Required Lenders and, if the rights and duties of
the Agent or any Co-Agent are affected thereby, by the Agent or such Co-Agent,
as the case may be, and by the Borrower; provided, however, that no such
amendment or waiver shall be effective, unless in writing and signed by each
Lender affected thereby, to the extent it (a) changes the several nature or the
amount (except pursuant to Section 2.03) or extends the term of such Lender's
Commitment, (b) reduces the principal of or the rate of interest on the Loans or
Notes, or any fees payable pursuant to any Loan Document, (c) postpones any date
fixed for, or reduces the amount of, any mandatory payment or prepayment of
principal of or interest on the Loans, Notes or any fees payable pursuant to any
Loan Document, (d) waives any condition precedent to the initial Loans, (e)
waives the payment of any amounts payable to any Lender pursuant to Section
3.04, 3.05 or 3.06 or (f) waives or amends Section 8.05, this Section 10.05 or
Section 10.12. Unless otherwise specified in such waiver, a waiver of any right
under any Loan Document shall be effective only in the specific instance and for
the specific purpose for which it is given. No election not to exercise, failure
to exercise or delay in exercising any right, nor any course of dealing or
performance, shall operate as a waiver of any right of the Agent, any Co-Agent
or any Lender under the Loan Documents or Governmental Requirements, nor shall
any single or partial exercise of any such right preclude any other or further
exercise thereof or the exercise of any other right of the Agent, any Co-Agent
or any Lender under the Loan Documents or Governmental Requirements.

          Section 10.06  Assignments and Participations. (a) Assignments.
Each Lender may from time to time, in accordance with applicable Governmental
Requirements, assign any or all of its rights and obligations under the Loan
Documents to one or more Eligible Assignees; provided, however, that no such
assignment shall be effective unless and until:  (i) the Borrower and the Agent
shall have given their written consent to such assignment (which consent shall
not 

                                       69
<PAGE>
 
be unreasonably withheld); (ii) except in the case of an assignment to a
Lender, the amount of the Commitment of the assigning Lender subject to each
such assignment (determined as of the date the Assignment Agreement respecting
such assignment is delivered to the Agent) shall not be less than $10,000,000;
and (iii) the parties to each such assignment shall have executed and delivered
to the Agent an Assignment Agreement together with an assignment fee of $3,000
payable to the Agent.  Upon acceptance and recording pursuant to Section
10.06(c), from and after the effective date specified in each Assignment
Agreement, (i) the assignee thereunder shall be a party hereto and, to the
extent of the interest assigned by such Assignment Agreement, have the rights
and obligations of a Lender under this Agreement and (ii) the assigning Lender
thereunder shall, to the extent of the interest assigned by such Assignment
Agreement, be released from its obligations under this Agreement (and, in the
case of an Assignment Agreement covering all or the remaining portion of an
assigning Lender's rights and obligations under this Agreement, such Lender
shall cease to be a party hereto, but shall continue to be entitled to the
benefits of Sections 3.04, 3.05, 3.06 and 10.02, as well as to amounts accrued
for its account pursuant to Section 2.04 or any other Loan Document and not yet
paid).

          (b) Maintenance of Register. The Agent shall maintain at one of its
offices in The City of New York a copy of each Assignment Agreement delivered to
it and a register for the recordation of the names and addresses of the Lenders
(including those becoming Lenders pursuant to an Assignment Agreement), and the
Commitments of and principal amount of the Loans owing to each Lender pursuant
to the terms hereof from time to time (the "Register"). The entries in the
Register shall be conclusive and the Borrower, the Agent, the Co-Agents and the
Lenders may treat each Person whose name is recorded in the Register pursuant to
the terms hereof as a Lender hereunder for all purposes of this Agreement,
notwithstanding notice to the contrary. The Register shall be available for
inspection by the Borrower and any Lender, at any reasonable time and from time
to time upon reasonable prior notice.

          (c) Acceptance and Recordation of Assignments.  On its receipt of a
duly completed Assignment Agreement executed by an assigning Lender and an
assignee,  the assignment fee referred to in Section 10.06(a) above and the
written consent of the Borrower and the Agent to such assignment, the Agent
shall (i) accept such Assignment Agreement, (ii) record the information
contained therein in the Register and (iii) give prompt notice thereof to the
Lenders.  No assignment shall be effective unless it has been recorded in the
Register as provided in this Section 10.06(c).  On acceptance and recording
pursuant to this Section 10.06(c) of any such assignment by a Lender, the
Borrower shall, against receipt of the existing Note of the assignor Lender,
issue new a Note to the assignee Lender and, in the case of a partial
assignment, to the assignor Lender, appropriately reflecting such assignment.

          (d) Assignments to Federal Reserve Banks.  Nothing in this Section
10.06 shall limit the right of any Lender to assign its interest in its Loans
and Note to a Federal Reserve Bank as collateral security under Regulation A of
the Board of Governors of the Federal Reserve System, but no such assignment
shall release such Lender from its obligations hereunder.

                                       70
<PAGE>
 
          (e) Participations.  Subject to Sections 10.04 and 10.06(f), each
Lender may from time to time, in accordance with applicable Governmental
Requirements, sell or otherwise grant participations in any or all of its rights
and obligations under the Loan Documents without the consent of the Borrower,
the Agent, any Co-Agent or any other Lender; provided, however, that no Lender
shall, without the written consent of the Borrower (which shall not be
unreasonably withheld), sell any such participation, or permit the resale or
other transfer of any such participation, to any Person other than a bank.  No
sale by a Lender of any participation shall relieve such Lender of any of its
obligations hereunder.

          (f) Rights of Participants.  Each participation agreement shall
provide that the Lender that has sold or granted the participation shall retain
the sole right to take or refrain from taking any action under the Loan
Documents, except that such participation agreement may provide that such Lender
shall not, without the consent of the participant, agree to any amendment or
waiver that would have the effect of (i) increasing the Commitment of such
Lender, (ii) extending the Termination Date, (iii) reducing the principal on the
Loans, to the extent that the participant would be affected thereby, (iv)
reducing the rate of interest on the Loans or Notes, to the extent that the
participant would be affected thereby or (v) reducing the amount of such
Lender's participation in any fees payable pursuant to Section 2.04, to the
extent that the participant would be affected thereby. All amounts payable to
any Lender under Section 3.04, 3.05 or Section 3.06 shall be determined as if
such Lender has not sold any participations.

          (g) Lender Representation.  Each Lender party to this Agreement on the
Closing Date hereby represents, and each Person that becomes a Lender pursuant
to an Assignment Agreement will represent, and shall be deemed to have
represented on becoming a party to this Agreement, that it is in fact, otherwise
than by reason of being a Lender, an Eligible Assignee and will make or acquire
Loans hereunder for its own account in the ordinary course of its business.

          Section 10.07 Governing Law. This Agreement and the Notes shall be
governed by and construed in accordance with the law of the State of New York
(without giving effect to its choice of law principles).

          Section 10.08 Judicial Proceedings; WAIVER OF JURY TRIAL. Any judicial
proceeding brought against the Borrower with respect to, or any dispute under or
arising out of or in connection with, any Loan Document Claim may be brought in
any court of competent jurisdiction in the Borough of Manhattan in The City of
New York, County of New York, and, by execution and delivery of this Agreement,
the Borrower (a) accepts, generally and unconditionally, the nonexclusive
jurisdiction of each such court and any related appellate court and irrevocably
agrees to be bound by any judgment rendered thereby in connection with any Loan
Document Claim and (b) to the fullest extent it may legally and effectively do
so, irrevocably waives any objection, including, without limitation, any
objection to the laying of venue or based on the grounds of forum non
conveniens, it may now or hereafter have to the bringing of any such
action or proceeding in such jurisdiction.  The Borrower shall appoint and

                                       71
<PAGE>
 
maintain CT Corporation System, The Prentice-Hall Corporation System Inc. or a
similar entity (the "Service Agent") as agent to receive on its behalf service
of process in any proceeding in a state or federal court located in the Borough
of Manhattan in The City of New York by entering into an agreement as of the
date of this Agreement with the Service Agent to such effect, and the Borrower
shall maintain such agreement (or an appropriate substitute to the same effect
with the same or a different Service Agent) for the entire term of this
Agreement.  The foregoing consent to jurisdiction and appointment of agent to
receive service of process shall not constitute a general consent to service of
process in the State of New York for any purpose except as provided above and
shall not be deemed to confer rights on any Person other than the Agent, any Co-
Agent and the Lenders.  Nothing herein shall affect the right of the Agent, any
Lender, any Co-Agent or any other Indemnified Person to serve process in any
other manner permitted by law or shall limit the right of the Agent, any Co-
Agent, any Lender or any other Indemnified Person to bring proceedings against
the Borrower in the courts of any other jurisdiction.  In light of the express
agreement of the Borrower to submit to the jurisdiction of New York courts for
the resolution of any and all disputes arising under this Agreement and brought
in New York courts pursuant to this Section 10.08, the Borrower further hereby
knowingly, voluntarily and intentionally waives, to the fullest extent permitted
by applicable law, any and all affirmative defenses it could or might otherwise
be able to assert based on an alleged incapacity of the Borrower to assert a
claim or counter-claim in the state courts of the State of New York located in
the Borough of Manhattan whether on the grounds that the Borrower has failed to
comply with any or all registration, certification, notification, filing or
designation-of-agent Governmental Requirements of the State of New York or on
other grounds. THE BORROWER AND EACH OTHER PARTY HERETO EACH HEREBY KNOWINGLY,
VOLUNTARILY AND INTENTIONALLY, IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO THE
FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY
JURY IN ANY JUDICIAL PROCEEDING INVOLVING ANY CLAIM ARISING OUT OF, RELATING TO
OR IN CONNECTION WITH ANY LOAN DOCUMENT CLAIM. THE BORROWER AND EACH OTHER PARTY
HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT,
IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B)
ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER
INTO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS APPLICABLE, BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 10.08.The
provisions of this Section 10.08 shall survive the termination of this Agreement
and the payment in full of the Obligations.

          Section 10.09 Severability of Provisions. In case any provision of the
Loan Documents is invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

          Section 10.10 Counterparts; Integration; Binding Effect. This
Agreement may be executed in any number of counterparts and by different parties
hereto in separate counterparts, each when so executed shall be deemed to be an
original and all of which taken
                                       72
<PAGE>
 
together shall constitute one and the same agreement. This Agreement shall
become effective when it shall have been executed by the Borrower, the Issuer
and the Agent and when the Agent shall have received an original signature page
signed by, or a facsimile copy of an original signature page signed by, each Co-
Agent and Lender listed on the signature pages hereof.

          Section 10.11 Entire Agreement. This Agreement, the Notes and the
other Loan Documents embody the entire agreement among the Borrower, the Agent,
the Co-Agents and the Lenders relating to the subject matter hereof and
supersede all prior agreements and understandings, oral or written, relating to
the subject matter hereof.

          Section 10.12 Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns in accordance with the terms hereof, except
that the Borrower may not assign or transfer any of its rights or obligations
under this Agreement without the prior written consent of all Lenders.

                                       73
<PAGE>
 
          IN WITNESS WHEREOF,  the parties hereto have caused this Agreement to
be executed and delivered by their duly authorized officers all as of May 8,
1995.



                             LYONDELL-CITGO REFINING COMPANY LTD.



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE BANK OF NEW YORK,
                              as Agent, as Issuer and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE BANK OF NOVA SCOTIA
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             CREDIT LYONNAIS
                              as Co-Agent



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       74
<PAGE>
 
                             THE FIRST NATIONAL BANK OF CHICAGO
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE INDUSTRIAL BANK OF JAPAN, LTD.
                              as Co-Agent and as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             OTHER LENDERS:

                             ABN AMRO BANK N.V.
 


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             ABN AMRO BANK N.V.
 


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       75
<PAGE>
 
                             BANQUE NATIONALE DE PARIS,
                                HOUSTON AGENCY



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             CAISSE NATIONALE DE CREDIT AGRICOLE



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:



                             CREDIT LYONNAIS CAYMAN ISLAND BRANCH
                              as a Lender



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             NATIONSBANK OF TEXAS, N.A.



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       76
<PAGE>
 
                             NBD BANK



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE NIPPON CREDIT BANK, LTD.
                                NEW YORK BRANCH



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             PNC BANK, NATIONAL ASSOCIATION



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             ROYAL BANK OF CANADA



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             SOCIETE GENERALE, SOUTHWEST AGENCY



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       77
<PAGE>
 
                             WESTDEUTSCHE LANDESBANK GIROZENTRALE,
                                NEW YORK AND CAYMAN
                                ISLANDS BRANCHES

 


                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:


                             THE YASUDA TRUST AND BANKING COMPANY, LTD.
                                NEW YORK BRANCH



                             By:  [Signature Appears Here]
                                -------------------------------------
                                Name:
                                Title:

                                       78

<PAGE>
 
                                                                  EXHIBIT 4.5(a)

                                AMENDMENT NO. 1

                       TO LYONDELL PETROCHEMICAL COMPANY
                         $400,000,000 CREDIT AGREEMENT

     This Amendment (the "Amendment"), is entered into as of April 1, 1995,
among Lyondell Petrochemical Company (the "Borrower"), the Banks listed on the
signature pages hereof and Texas Commerce Bank National Association, a national
banking association, as Administrative Agent and Bank of America Illinois,
(formerly Continental Bank N.A.) as Co-Agent.

     The Borrower, the Banks, the Administrative Agent and the Co-Agent have
entered into the Credit Agreement dated as of December 6, 1993 (the
"Agreement").

     WHEREAS, Section 9.05 of the Agreement provides that the Borrower and the
Banks may, by written action, amend or waive any provision of the Agreement; and

     WHEREAS, the Borrower has requested that the Banks revise the interest
rates applicable to Borrowings and Letter of Credit drawings under the Agreement
as well as the determination of the amount of the commitment fee paid by the
Borrower;

     THEREFORE, in consideration of the mutual promises contained herein and for
other good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, the parties hereto do hereby agree that the Agreement shall
be amended as follows:

     1.  Unless otherwise specified herein, all terms defined in the Agreement
have the same meaning when used herein and references to "Sections" and
"Schedules" are references to sections and schedules of or to the Agreement.

     2.  The determination of the Base Rate Margin as set forth in Schedule
2.07(a), is amended so that the second sentence of the first paragraph reads as
follows:

          "In the event of a split rating, the Base Rate Margin will be based
          upon the higher of the two credit ratings published by S&P or
          Moody's."
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 2

          3.   The determination of the Letter of Credit Margins as set forth in
Schedule 2.07(b), is amended so that the second sentence of the first paragraph
reads as follows:

          "In the event of a split rating, the Letter of Credit Margins will be
          based upon the higher of the two credit ratings published by S&P or
          Moody's."

          4.   The determination of the CD Margin as set forth in Schedule
2.07(c), is amended so that the second sentence of the first paragraph reads as
follows:

          "In the event of a split rating, the CD Margin will be based upon the
          higher of the two credit ratings published by S&P or Moody's."

          5.   The determination of the Euro-Dollar Margin as set forth in
Schedule 2.07(d), is amended so that the second sentence of the first paragraph
reads as follows:

          "In the event of a split rating, the Euro-Dollar Margin will be based
          upon the higher of the two credit ratings published by S&P or
          Moody's."

          6.   The determination of the commitment fee in Schedule 2.15 shall be
amended so that the second sentence of the first paragraph reads as follows:

          "In the event of a split rating, the commitment fee shall be based
          upon the higher of the two credit ratings published by S&P or
          Moody's."

              7.  Ratifications.  Except as herein specifically amended and
modified, (a) the Agreement is unchanged and continues in full force and effect,
and (b) the Borrower hereby confirms and ratifies the Agreement's existence and
each and every term, condition, and covenant therein contained, to the same
extent and as though the same were set out herein in full.

          8.   Representations and Warranties.  The Borrower hereby represents
and warrants to the Banks, the Administrative Agent, and the Co-Agent that (a)
this Amendment and the Loan Documents to be delivered hereunder have been duly
executed and delivered by the Borrower, (b) no action of, or filing with, any
agency is required to authorize, or is otherwise required in connection with,
the execution, delivery, and performance by the Borrower of this Amendment and
the Loan Documents to be delivered hereunder, (c) this Amendment and the Loan
Documents to be delivered hereunder are valid and binding upon the Borrower and
are enforceable against the
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 3

Borrower in accordance with their respective terms, except as limited by the
Bankruptcy Code of the United States of America and all other similar Laws
affecting the rights of creditors generally, (d) the execution, delivery and
performance by the Borrower of this Amendment and the Loan Documents to be
delivered hereunder do not require the consent of any other Person and do not
and will not constitute a violation of any laws, agreement, or understanding to
which the Borrower is a party or by which the Borrower is bound, (e) the
representations and warranties contained in the Agreement, as amended hereby,
and any other Loan Documents are true and correct in all material respects on
and as of the date of execution hereof as though made as of the date of
execution hereof, and (f) as of the date of this amendment, no Default or Event
of Default has occurred and is continuing.

          9.   References.  All references in the Loan Documents to the
Agreement shall refer to the Agreement as amended by this amendment, and,
because this amendment is a "Loan Document" referred to in the Agreement, then
the provisions relating to Loan Documents set forth in the Agreement are
incorporated herein by reference, the same as if set forth herein verbatim.

          10.  Counterparts.  This Amendment may be executed in a number of
identical counterparts, each of which shall be deemed an original.  In making
proof of this instrument, it shall not be necessary for any party to account for
all counterparts, and it shall be sufficient for any party to produce but one
such counterpart.

          11.  Parties Bound.  This Amendment shall be binding upon and shall
inure to the benefit of the Borrower, the Administrative Agent, the Co-Agent,
and each Bank, and, subject to Section 9.07 of the Agreement, their respective
successors and assigns.

          12.  ENTIRETY.  THIS AMENDMENT, THE AGREEMENT AS AMENDED HEREBY, AND
THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL CREDIT AGREEMENT BETWEEN THE
PARTIES FOR THE TRANSACTIONS THEREIN, AND MAY NOT BE CONTRADICTED BY EVIDENCE OF
PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS BY THE PARTIES.  THERE ARE
NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

     IN WITNESS WHEREOF, each of the parties hereto has caused this Amendment to
be executed by its duly authorized officer as of the day and year first above
written.
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 4

                         LYONDELL PETROCHEMICAL COMPANY



                         By: [Signature Appears Here]               
                           ---------------------------------------
                            Title:  Senior Vice President,
                                    Chief Financial Officer
                                    and Treasurer

 
                         TEXAS COMMERCE BANK NATIONAL ASSOCIATION,
                         Individually and as Administrative Agent


                         By: [Signature Appears Here]
                            -------------------------------------
                            Title: Vice President


                         BANK OF AMERICA, ILLINOIS,
                         Individually and as Co-Agent


                         By: [Signature Appears Here]
                            -------------------------------------
                            Title: Vice President


                         THE BANK OF NEW YORK

                           [Signature Appears Here]
                         -----------------------------------------
                         By:
                         Title:

                         THE BANK OF NOVA SCOTIA

                           [Signature Appears Here]
                         ----------------------------------------
                         By:  
                         Title:
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 5

                         THE BANK OF TOKYO

                           [Signature Appears Here]
                         ---------------------------------------
                         By:
                         Title:


                         CIBC, INC.

                           [Signature Appears Here]
                         ---------------------------------------
                         By:
                         Title:


                         COMERICA BANK

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:


                         FIRST INTERSTATE BANK OF TEXAS, N.A.

                           [Signature Appears Here]
                         -------------------------------------
                         By:
                         Title:
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 6

                         THE FIRST NATIONAL BANK OF BOSTON

                           [Signature Appears Here]
                         -------------------------------------
                         By:
                         Title:


                         THE FIRST NATIONAL BANK OF CHICAGO

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:


                         FUJI BANK

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:
 

                         THE INDUSTRIAL BANK OF JAPAN TRUST COMPANY

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:


                         THE MITSUBISHI TRUST AND BANKING CORP.

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:
<PAGE>
 
AMENDMENT NO. 1
TO LYONDELL PETROCHEMICAL COMPANY
$400,000,000 CREDIT AGREEMENT
PAGE 7

                         NATIONSBANK OF TEXAS, N.A.

                           [Signature Appears Here]
                         --------------------------------------
                         By:
                         Title:


                         PNC BANK, NATIONAL ASSOCIATION

                           [Signature Appears Here]
                         -------------------------------------
                         By:
                         Title:


                         SOCIETE GENERALE, SOUTHWEST AGENCY

                           [Signature Appears Here]
                         -------------------------------------
                         By:
                         Title:


                         UNION BANK OF SWITZERLAND

                           [Signature Appears Here]
                         ------------------------------------
                         By:
                         Title:

                           [Signature Appears Here]
                         ------------------------------------
                         By:
                         Title:


                         YASUDA TRUST AND BANKING COMPANY
                         LIMITED, NEW YORK BRANCH

                           [Signature Appears Here]
                         -----------------------------------
                         By:
                         Title:

<PAGE>

                                                                Exhibit 10.28(d)

                                AMENDMENT NO. 1
                                      TO
                             AMENDED AND RESTATED
                   LIMITED LIABILITY COMPANY REGULATIONS OF

                     LYONDELL-CITGO REFINING COMPANY LTD.
                                (the "Company")

  Amendment No. 1 (the "Amendment") to the Amended and Restated Limited 
Liability Company Regulations (the "Regulations") of LYONDELL-CITGO 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 April 28, 1995. All terms defined in the Regulations are 
used herein with the meanings provided in the Regulations.

  1.  Section 7.2 of the Regulations is hereby amended to read hereafter in its 
entirety as follows:

  7.2 Income and Distribution Determinations; Restriction on Distributions and 
      Advances. Profits and Losses shall be allocated as of the close of
      business on the last day of each Calendar Quarter. Distributions of
      Distributable Cash shall be made on a monthly basis and, regardless of the
      date a distribution is actually paid, distributions shall be treated as
      having been made on the last day of the calendar month immediately
      preceding the date of the distribution. Any other provisions of these
      Regulations to the contrary notwithstanding, however, the Company shall
      not make any distribution of Distributable Cash or any advances (including
      any distributions pursuant to Sections 7.2, 7.3, 7.4 or 7.5 and any
      advances pursuant to Section 7.6) for so long as, under the terms of any
      agreement, contract or instrument evidencing, governing or securing any
      indebtedness for borrowed money (including loans or capital leases), an
      event of default exists (or would exist upon the making of such
      distribution or advance) and such agreement, contract or instrument
      prohibits the making of such distribution or advance during the
      continuance of such event of default.

  2.  Section 7.3(C) of the Regulations is hereby amended to read hereafter in 
its entirety as follows:

  7.3 Distributable Cash.

      (C)  To the extent that the Company does not have sufficient cash to make 
           the distributions or deposits as provided in Section 7.4 or Section
           7.5, then, except as otherwise expressly provided, distributions and
           deposits shall be made in proportion to the amounts distributable to
           or for each Owner. Any amount which is required to be distributed
           pursuant to Section 7.4 (other than an amount described in Section
           7.4.(B)) or Section 7.5, but which is not distributed for any reason,
           including, without limitation, by reason of insufficient cash or by
           virtue of the last sentence of Section 7.2,

                                      A-1

<PAGE>
 
           shall constitute a debt owed by the Company to the Owner entitled to
           such distribution, which debt is to be paid, with interest at the
           Agreed Rate (subject to Section 13.11), as quickly as possible, but
           in all events before any other distributions with respect to
           subsequent months are paid to the Owners.

  3.  Except as set forth above the Regulations remain unmodified, and, as 
amended above, the Regulations remain in full force and effect.

                                      A-2

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<MULTIPLIER> 1,000,000
       
<S>                                         <C>
<PERIOD-TYPE>                             3-MOS
<FISCAL-YEAR-END>                         DEC-31-1995  
<PERIOD-START>                            JAN-01-1995  
<PERIOD-END>                              MAR-31-1995
<CASH>                                              243
<SECURITIES>                                          0
<RECEIVABLES>                                       329
<ALLOWANCES>                                          3
<INVENTORY>                                         251
<CURRENT-ASSETS>                                    830
<PP&E>                                            2,909
<DEPRECIATION>                                    1,943
<TOTAL-ASSETS>                                    1,881
<CURRENT-LIABILITIES>                               466
<BONDS>                                             707
<COMMON>                                             80
                                 0
                                           0
<OTHER-SE>                                           92
<TOTAL-LIABILITY-AND-EQUITY>                      1,881
<SALES>                                           1,174
<TOTAL-REVENUES>                                  1,174
<CGS>                                               907
<TOTAL-COSTS>                                       907
<OTHER-EXPENSES>                                     45
<LOSS-PROVISION>                                      0
<INTEREST-EXPENSE>                                   18
<INCOME-PRETAX>                                     202
<INCOME-TAX>                                         75
<INCOME-CONTINUING>                                 127
<DISCONTINUED>                                        0
<EXTRAORDINARY>                                       0
<CHANGES>                                             0
<NET-INCOME>                                        127
<EPS-PRIMARY>                                      1.59 
<EPS-DILUTED>                                      1.59
        




</TABLE>


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