MOBIL CORP
10-K, 1999-03-31
PETROLEUM REFINING
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<PAGE>
 
                                      1998
 ------------------------------------------------------------------------------

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, DC 20549-1004

                                    FORM 10-K

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

                   For the fiscal year ended December 31, 1998
                                             -----------------

                           Commission File No. 1-7555
                                               ------

                                MOBIL CORPORATION
             (Exact name of registrant as specified in its charter)

                 Delaware                                 13-2850309     
     -------------------------------                 ---------------------
     (State or other jurisdiction of                   (I.R.S. Employer
     incorporation or organization)                   Identification No.)

                 3225 Gallows Road, Fairfax, Virginia 22037-0001
                            Telephone: (703) 846-3000
                 -----------------------------------------------
                    (Address of principal executive offices)

           Securities registered pursuant to Section 12(b) of the Act:

                                                     Name of Each Exchange
     Title of Each Class                              on Which Registered 
- ----------------------------------------            -----------------------
Common Stock, $1.00 Par Value                       New York Stock Exchange
7 5/8% Debentures due 2033                          New York Stock Exchange 
8% Debentures Due 2032                              New York Stock Exchange 
8 3/8% Notes Due 2001                               New York Stock Exchange
8 5/8% Debentures Due 2021                          New York Stock Exchange

           Securities registered pursuant to Section 12(g) of the Act:
   Guarantee, Mobil Oil Corporation Employee Stock Ownership Plan (ESOP) Trust
                     9.17% Sinking Fund Debentures Due 2000

     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 reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X . No   .
                                             ---    ---
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of the registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.
                             ----

     The number of voting securities of the registrant outstanding on February
26, 1999, the latest practicable date, was (i) 781,208,438 shares of common
stock, all of which comprise a single class with a $1.00 par value, and each
being entitled to one vote and (ii) 163,469 shares of Series B ESOP Convertible
Preferred Stock, $1.00 par value per share, and each being entitled to 100 votes
for a total of 16,346,900 votes. As of the same date, the aggregate market value
of voting stock held by non-affiliates of the registrant was $64,926,634,136,
based on a closing price of $83.1875 per share. The approximate number of common
equity security holders as of the same date was 177,137.

     Parts I and II incorporate information by reference to the Annual Report to
Shareholders for the year ended December 31, 1998. Part III contains information
incorporated by reference to the registrant's definitive proxy statement, which
will be filed with the Securities and Exchange Commission within 120 days after
December 31, 1998.

- ------------------------------------------------------------------------------
<PAGE>
 
                                MOBIL CORPORATION
                                    Form 10-K
                                December 31, 1998
                                TABLE OF CONTENTS


                                                                Page(s)         
                                                        ------------------------

                                                           1998         1998
                                                          Annual       Annual
                                                        Report on    Report to
                                                        Form 10-K   Shareholders
                                                        ---------   ------------
                                     PART I

Item  1. Business .....................................    1               --
            (a) General ...............................    1               --
            (b) Environmental Matters .................    1            27,46
            (c) Segment and Geographic Information ....    2            36,37
            (d) Business Description and Properties ...    2         54-56,62
                   Petroleum Operations ...............    2               --
                     Upstream .........................    3               --
                     Downstream .......................   16               --
                   Chemical Operations ................   17               --
                   Other Operations ...................   18               --
Item  2. Properties ...................................   19               --
Item  3. Legal Proceedings ............................   19               --
Item  4. Submission of Matters to a Vote
            of Security Holders .......................   19               --

                                     PART II

Item  5. Market for Registrant's Common Stock
           and Related Stockholder Matters ............   22               29
Item  6. Selected Financial Data ......................   22               63
Item  7. Management's Discussion and Analysis
           of Results of Operations and
           Financial Condition ........................   22      14-30,32,34
Item 7A. Quantitative and Qualitative Disclosures
           About Market Risk ..........................   22            22,23
Item  8. Financial Statements and
           Supplementary Data .........................   22   29,31,33,35-59
Item  9. Changes in and Disagreements with
           Accountants on Accounting and
           Financial Disclosure .......................   22               --

                                    PART III

Item 10. Directors and Executive Officers
           of the Registrant ..........................   22               --
Item 11. Executive Compensation .......................   22               --
Item 12. Security Ownership of Certain Beneficial
           Owners and Management ......................   22               --
Item 13. Certain Relationships and
           Related Transactions .......................   22               --

                                     PART IV

Item 14. Exhibits, Financial Statement Schedules
           and Reports on Form 8-K ....................   23               --
         Supplemental Financial Information ...........   25               --
           Financial Statement Schedule ...............   25               --
         Signatures ...................................   26               --
         Exhibit Index ................................   27               --
         Exhibits .....................................   29               --
<PAGE>
 
                                     PART I

Item 1. Business.

(a) General

     Mobil Corporation (Mobil) was incorporated in March 1976 in the state of
Delaware. Mobil's principal business, which is conducted primarily through
wholly-owned subsidiaries, is in the petroleum industry. Mobil is also a
manufacturer and marketer of petrochemicals, packaging films and specialty
chemical products. Through its subsidiaries, Mobil had business interests in
about 140 countries and employed approximately 41,500 people worldwide at
December 31, 1998.

     Through its subsidiaries, Mobil operates a worldwide oil and gas
exploration and producing business, a global marketing and refining complex, a
network of pipelines and tankers linking these worldwide oil and gas businesses,
a world-scale chemical business and a highly sophisticated research and
engineering operation.

     A list of Mobil's most significant subsidiaries is contained on pages 30
through 32 of this Annual Report on Form 10-K. In this Report, except as
otherwise indicated by the context, the term "Mobil" refers to the parent
corporation and all of its subsidiaries and affiliates and their operating
divisions collectively, and sometimes to one or more of them.

     Mobil makes no representations as to the future trend of its business and
earnings, or as to future events and developments that could affect the oil
industry in particular and that may affect other businesses in which Mobil is
directly or indirectly engaged. These include such matters as the divestiture of
certain operations, environmental quality control standards, oil imports, new
discoveries of hydrocarbons and the demand for petroleum products. Furthermore,
Mobil's business could be affected by future price changes or controls, material
and labor costs, legislation, taxes, labor conditions, transportation
regulations, tariffs, litigation, embargoes, foreign currency exchange
restrictions and changes in foreign currency exchange rates. Mobil has direct
and indirect investments and interests in many enterprises worldwide and makes
no representation as to future developments, which may have a profound effect on
its business enterprises throughout the world. The current low crude oil prices
can affect the ability of some countries to generate sufficient cash flows to
meet budgets for their domestic needs and fund joint ventures with Mobil and
other oil companies. These circumstances increase the political, economic, and
hydrocarbon risks related to operations in countries that depend on hydrocarbon
resources for significant cash flow. Countries in addition to the U.S. in which
Mobil has significant operations include, Australia, Canada, Germany, Indonesia,
Japan, Kazakhstan, Nigeria, Norway, Qatar, Saudi Arabia, the United Kingdom
(U.K.), and Venezuela.

(b) Environmental Matters

     The discussions of Environmental Matters on pages 27 and 46 of Mobil's 1998
Annual Report to Shareholders are incorporated herein by reference.

     Mobil and certain of its subsidiaries and affiliates are parties to
numerous proceedings instituted by governmental authorities and others under
provisions of applicable laws or regulations relating to the discharge of
materials into the environment. Such environmental proceedings are further
discussed herein on page 19 under Item 3. Legal Proceedings.

                                      -1-
<PAGE>
 
(c)   Segment and Geographic Information

     Segment and Geographic information for 1996, 1997 and 1998 on pages 36 and
37 of Mobil's 1998 Annual Report to Shareholders is incorporated herein by
reference.

(d)  Business Description and Properties

     In addition to the business description and properties contained herein,
the following data included in Mobil's 1998 Annual Report to Shareholders are
incorporated herein by reference:

                                                               1998 Annual
                                                                Report to
                                                               Shareholders
                  Description                                      Page    
- -------------------------------------------------------------  ------------
Estimated Quantities of Net Proved Oil and
  Natural Gas Liquids Reserves (Table 1) ....................       54
Estimated Quantities of Net Proved Natural                        
  Gas Reserves (Table 2) ....................................       56
Petroleum Product Sales .....................................       62
Refinery Runs ...............................................       62
Chemical Sales by Product Category ..........................       62

     PETROLEUM OPERATIONS

     Mobil is one of the largest oil companies in the world, with petroleum
product sales of over 3.4 million barrels a day. In 1998 Mobil produced the oil
equivalent of about 1.7 million barrels daily of crude oil, natural gas liquids
and natural gas and had refinery runs of 2.1 million barrels per day. Petroleum
net sales in 1998 were $42,786 million, down 36% from 1996 and 21% from 1997.
The decrease in 1998 from 1997 was principally due to the effects of falling
crude, petroleum product and natural gas prices.

- --------------------------------------------------------------------------------
Petroleum Sales (a)                                 1996       1997       1998  
(Millions of dollars)
- --------------------------------------------------------------------------------

Automotive gasoline ........................   $23,193     $17,180     $13,835
Distillate and jet fuels ...................    17,842      12,096       8,871
Other refined petroleum products ...........     8,193       6,686       5,853
                                               -------     -------     -------
Total refined petroleum products ...........    49,228      35,962      28,559
Crude oil ..................................    11,206      12,564       9,608
Natural gas ................................     5,369       4,653       3,612
Other products .............................       906       1,004       1,007
                                               -------     -------     -------
Net Sales of Petroleum .....................   $66,709     $54,183     $42,786
                                               =======     =======     =======
(a) Excludes excise and state gasoline
      taxes of .............................   $ 9,236     $ 5,928     $ 5,853

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

     Prices for crude oil have experienced dramatic fluctuations during the past
several years in response to both political and market factors, making it
difficult to forecast future trends in prices or margins in Petroleum
Operations. During 1998 average worldwide crude oil prices decreased about $6.50
per barrel, reflecting increased supplies, slower worldwide demand growth due to
the Asian financial crisis and milder weather.

     Mobil's Petroleum Operations are divided into two primary business
activities -- Upstream, which refers to exploration and producing; and
Downstream, which refers to marketing, refining, supply and transportation.

                                      -2-
<PAGE>
 
     PETROLEUM OPERATIONS -- UPSTREAM

Exploration and Producing

     Developments in 1998 in Mobil's exploration and producing operations
included the following:

Worldwide

     In 1998, Mobil conducted exploration and producing activities in 38
countries. Net production of liquids (crude oil and natural gas liquids)
averaged 935 thousand barrels a day (TBD) in 1998, an increase of 8 TBD from 927
TBD in 1997. Net natural gas production of 4,296 million cubic feet a day
(MMCFD) in 1998 was 260 MMCFD lower than 1997. Total production was down 40
thousand barrels per day of oil equivalent (TBDOE), primarily due to reduced
volumes related to a change in the production sharing split in Indonesia,
declines in mature areas such as the United States and Europe and limitations on
production in Nigeria. The lower production was somewhat offset by new volumes
from Hibernia (located offshore Eastern Canada), Equatorial Guinea, Kazakhstan
and Turkmenistan. Proved liquids and natural gas reserve additions replaced 165%
of 1998 production on a barrel of oil equivalent (BOE) basis, including
purchases and sales. The following table summarizes net production of crude oil,
natural gas liquids (NGL) and natural gas for 1996 through 1998.

- --------------------------------------------------------------------------------
                                     Crude Oil & NGL(TBD)   Natural Gas(MMCFD)
- --------------------------------------------------------------------------------
Net Production                    1996    1997    1998    1996    1997    1998
- --------------------------------------------------------------------------------

Fully consolidated companies
  United States ..............     262     186     136   1,333   1,141   1,043
  Europe .....................     153     158     139   1,187   1,233   1,199
  Asia-Pacific ...............     106      97      86   1,581   1,596   1,359
  Other Areas ................     271     348     378     446     474     554
                                 -----   -----   -----   -----   -----   -----
  Total Consolidated .........     792     789     739   4,547   4,444   4,155
                                 -----   -----   -----   -----   -----   -----
Mobil's share of production of
  equity companies ...........      62     138     196      40     112     141
                                 -----   -----   -----   -----   -----   -----
Total Production .............     854     927     935   4,587   4,556   4,296
                                 =====   =====   =====   =====   =====   =====

     This table presents Mobil's net production from properties in which it has
a working or royalty interest and its share of production of investees accounted
for on the equity method. Net production excludes royalties and quantities due
others when produced, whether taken in kind or settled in cash.

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

United States

     Including Mobil's share of production from its upstream alliance with Shell
in California, Mobil's production in the United States during 1998 was 240 TBD
of liquids and 1,077 MMCFD of natural gas or a total of 435 TBDOE. Compared with
1997, total production decreased 19 TBDOE as a result of natural field declines,
the effects of divestments of noncore assets, operational downtime due to the
storms in the Gulf of Mexico and a rationalization of the capital program.

     Aera Energy, Mobil's upstream alliance with Shell in California, continues
to be the largest hydrocarbon producer (290 TBDOE at year end 1998, 100% basis)
in the state. In November, Mobil traded several non-strategic Gulf of Mexico
shelf properties to ARCO for ARCO's interest in several California properties
thereby increasing Mobil's net reserves. Mobil then contributed these to the
Aera joint venture, increasing Mobil's equity interest in Aera from 41.4% to
48.2%.

                                      -3-
<PAGE>
 
     Significant developments - continued

     The Gulf of Mexico, including Mobile Bay, remains a strong contributor to
Mobil's total domestic production. In 1998, Mobile Bay produced 320 MMCFD (178
MMCFD, Mobil share) of natural gas. Also, in 1998, Mobil greatly increased its
acreage and prospect inventory in the deepwater Gulf of Mexico. While exiting
from less strategic blocks, Mobil added 98 new blocks, increasing Mobil's total
inventory of prospective deepwater blocks to almost 300.

     Mobil participated in the 1998 Llano discovery in Garden Banks Block 386,
which is currently being appraised. In 1998, Mobil successfully drilled wells
confirming the Chinook (Mobil share, 66%) discovery in the Main Pass/Viosca
Knoll area in the Gulf of Mexico. This development is expected to stream late
1999, with an expected production rate of about 17 TBDOE (Mobil share) by 2000.

Europe
- ------

     Mobil produced 63 TBD of liquids and 596 MMCFD of natural gas in the United
Kingdom during 1998. Liquids production was down 16% from 1997 levels primarily
due to natural declines in older fields and a trade, with Monument Oil and Gas
plc, of the majority of Mobil's 20% equity interest in the Hudson field for
additional interest in Argentina's Sierra Chata gas field. Natural gas
production was down 11% from 1997 levels primarily due to warmer weather in the
first half of the year and natural field declines in older fields, partly offset
by the streaming of production from several new fields in the Southern Gas Basin
and record natural gas production from the Beryl area. Mobil's 50% share in
Beryl area fields (Beryl, Ness, Nevis, Katrine) produced 45 TBD of liquids and
143 MMCFD of natural gas during 1998.

     Mobil participated in five new field start-ups during 1998. First
production started from Nevis North, a Beryl area satellite, Malory, Deben, Bure
West and Delilah fields. Mobil's combined share of production from these new
fields will be around 2 TBD of liquids and 50 MMCFD of natural gas in 1999.
Mobil has a 50% interest in Nevis North, 76% interest in Malory, 23.33%
interests in Deben and Bure West, and 10.69% interest in Delilah.

     Field development approval was obtained from the U. K. government for
Buckland, Jupiter phase II, and Katrine. The Mobil-operated Buckland field
(Mobil share, 35%) is expected to begin production in 1999, ramping up to about
11 TBD of liquids and 11 MMCFD of natural gas (Mobil share) by 2000. First
production from the Jupiter phase II satellites (Callisto North, Europa and
Sinope) is expected in 1999 at 9 MMCFD of natural gas, increasing to 35 MMCFD
(Mobil share) of natural gas in 2000. Mobil has a 50% interest in Jupiter phase
II. Continued production following the successful 1997 Katrine extended well
test will contribute an additional 2 TBDOE (Mobil share, 50%) to 1999 volumes.

     The Shearwater development (Mobil share, 16.5%) progressed with four of the
five development wells now drilled in the main reservoir. Commercial agreements
were signed for the construction and operation of the new Shearwater-Elgin Area
Line (SEAL) pipeline. First liquids and natural gas deliveries are planned for
2000. Production is expected to be 62 MMCFD of natural gas and 13 TBD (Mobil
share) of NGL by the end of 2001.

     The extension of the Mobil-operated Scottish Area Gas Evacuation (SAGE)
onshore processing terminal at St. Fergus was completed, providing processing
capacity for the Britannia field. A new export record for the terminal of 1.7
billion cubic feet a day (BCFD) of natural gas was set following the Britannia
field start-up.

                                      -4-
<PAGE>
 
Significant developments - continued

     The Interconnector Pipeline linking the natural gas transmission systems of
the U.K. and the European continent opened in October 1998. Mobil arranged
capacity in a pan-European transportation fairway enabling customers to be
served from Germany to Ireland. In addition, Mobil Gas Marketing (MGM) and Mobil
Europe Gas Inc. (MEGAS) entered into trades with third parties to optimize
Mobil's position across the Interconnector.

     In 1998, Mobil produced 455 MMCFD of natural gas and 3 TBD of crude oil,
totaling 86 TBDOE from Germany. Natural gas sales in Germany set a record high
of 583 MMCFD, including imports from the Netherlands and Norway.

     Germany added 303 BCF of proved natural gas reserves, replacing 183% of
natural gas production. This was the result of a successful appraisal drilling
program as well as continued improvement in reservoir performance. Nine wells
were completed in 1998, with an additional five drilling at year-end.

     Mobil produced 104 MMCFD of natural gas in the Netherlands during 1998.
Natural gas production increased 73% as a result of the full year contribution
of the Anjum field (Mobil share, 20%), which came on stream in late 1997.

     Two natural gas discoveries (Ezumazijl and M/9-F) were made on the North
Friesland Concession (Mobil share, 20%) in 1998. The larger Ezumazijl discovery
will be tied back to the Anjum processing train and commence production in early
1999. As a result of the Ezumazijl discovery and re-evaluation of other onshore
Anjum area fields, Mobil added 52 BCF of proved reserves thereby replacing 137%
of production in the Netherlands.

     Mobil produced 73 TBD of liquids and 44 MMCFD of natural gas in Norway
during 1998, primarily from two of Europe's largest fields, Statfjord and
Oseberg, and a growing contribution from the Njord field.

     The Statfjord North Flank will supplement production at Statfjord with
about 45 TBD (Mobil share, 5 TBD). Sygna, a satellite development located north
of Statfjord, will add a further 17 TBD (Mobil share, 3 TBD). Oseberg East is
scheduled for production start-up in early 1999, followed by Oseberg South in
2000. Mobil's share of production from these fields will be about 9 TBDOE.
Development of natural gas reserves at Oseberg is also progressing with gas
injection starting in 1999 and production anticipated in 2000. Mobil's share of
production will initially be 10 MMCFD, increasing to about 40 MMCFD by 2012.

     First production from the Njord field (Mobil share, 20%) began in September
1997. Production exceeded the planned plateau level of 67 TBD (Mobil share, 13
TBD) in late 1998.

     The Halten Terrace, an emerging core area, includes Aasgard, the new
Haltenbanken South and Skarv developments along with the Njord field, which
reached plateau production in 1998. Aasgard liquids production is scheduled for
second quarter 1999 with natural gas production due in the fourth quarter of
2000. The Haltenbanken South project will develop two of the four largest
Norwegian discoveries of the last ten years, Kristin (1997) and Lavrans (1995),
with the potential inclusion of two earlier discoveries. Start-up of this
natural gas condensate project is planned for 2004, with peak production of 270
TBDOE (Mobil share, 30 TBDOE) in 2006. Subject to appraisal drilling results,
the Skarv field, Mobil's fourth significant discovery in the past four years is
expected to begin production in 2004 with estimated peak production of 140 TBDOE
in 2009 (Mobil share, 20 TBDOE).

                                      -5-
<PAGE>
 
Significant developments - continued

     The development plan for Fram (Mobil share, 25%) is being expanded to
possibly include other resources in the Greater Sogn area. Start-up is expected
in the 2003-2004 time frame.

Asia-Pacific

     In 1998, Mobil's share of production from Indonesia averaged 1,354 MMCFD of
natural gas, 25 TBD of condensate, and 12 TBD of liquefied petroleum gas (LPG).
Under Production Sharing Contracts (PSC's) with Pertamina, the state oil and gas
company, Mobil has interests in 11 blocks comprising 6.99 million acres. One of
these blocks includes the Arun field, Indonesia's largest producing natural gas
field, discovered in 1971. Mobil's share of production in Arun decreased versus
1997 due to the contractual change in Mobil/Pertamina interests consistent with
moving into the extension period of the PSC.

     Pase field production began in January 1998 with three high-rate wells to
supplement gas deliveries to the Arun LNG plant. Pase well production rates are
substantially higher than initially expected. Each well is capable of producing
in excess of 100 MMCFD. Development activities in the North Sumatra Offshore
(NSO) "A" continue with first production scheduled for July 1999. In addition,
South Lhok Sukon - B1 is scheduled for a 1999 start-up.

     Outside of North Sumatra, Mobil's interests include 50% in the Makassar
Strait PSC (offshore East Kalimantan) and a pending assignment of a 30% interest
in the adjacent Rapak PSC. Mobil made significant discoveries in the Merah Besar
and Seno prospect areas of Makassar in 1998. A Plan of Development for the West
Seno field is being formulated for submission to the Government of Indonesia in
1999. An aggressive drilling program will continue in early 1999 to evaluate
several prospects on the Rapak PSC and the northern portion of the Makassar
Strait PSC.

     Mobil's average production in Australia decreased from 44 TBDOE to 39 TBDOE
in 1998 due to natural field declines and the disposal of natural gas assets in
late 1997. Much of Australia's production comes from two offshore fields, Wandoo
(Mobil share, 60% and operator) and Griffin (Mobil share, 35%), located on the
North West Shelf. Wandoo achieved average oil production of 28 TBDOE.

     The Griffin field came back on line in early March after repairs to
equipment on the Griffin Venturer floating production, storage, and off-loading
vessel (FPSO) were completed. Full production was restored in April at an
average rate of 49 TBDOE (Mobil share, 17 TBDOE).

     In 1998, two additional appraisal wells were drilled in the Gorgon gas
field, (Mobil share, 14.3%). Market conditions in Asia have delayed achieving a
sales contract for Gorgon LNG.

     Two 1997 oil discoveries were appraised with wells on the Pitcairn (Mobil
share, 33.4%) and Woollybutt oil fields (Mobil share, 20%). Exploration drilling
in the acreage acquired from Ampolex discovered a major new natural gas resource
at the John Brookes-1 well location (Mobil share, 35% and operator).

     A production license was awarded to Mobil and its partner, Phillips Oil
Company Australia, to cover the 1997 Athena natural gas-condensate discovery.
The Athena field in the Carnarvon Basin is an extension of the giant Perseus
natural gas field discovered by the North West Shelf joint venture in the early
1990s.

                                      -6-
<PAGE>
 
Significant developments - continued

     Mobil's production in Papua New Guinea was maintained during 1998 as new
oil production from Gobe Main (Mobil share, 14.5%) and SE Gobe (Mobil share,
10%) came on line. The Gobe field, Papua New Guinea's second commercial oil
field, was brought on stream in March and produced an average of 20 TBD for the
remainder of 1998 (Mobil share, 2 TBD). Development drilling will continue into
1999 with a peak rate of 45 TBD expected in September, 1999 (Mobil share, 5
TBD).

     The Moran field was appraised with the 5X well. This well was immediately
tied in to the extended well test for the Moran field, increasing gross
production to 15 TBD at year-end (Mobil share, 2 TBD). The average rate
throughout 1998 was almost 10 TBD (Mobil share, 1 TBD). Studies are now under
way to evaluate future development plans.

Other

     In 1998, Canada produced 71 TBD of liquids and 440 MMCFD of natural gas for
total production of 151 TBDOE, up about 25% from 1997. Most of the increase came
from Hibernia's contribution of 22 TBD.

     Mobil has a 33.1% share in the Hibernia oil field located 195 miles
southeast of St. John's, Newfoundland. In 1998, Hibernia continued its drilling
program, completing three producing and four water and natural gas injection
wells needed to support reservoir pressure. At year end, one producing well and
one injection well were still in the process of being drilled. Production is
expected to increase to 135 TBD (Mobil share, 45 TBD) in 1999.

     Mobil holds a 50.8% working interest in the Sable Offshore Energy Project
(SOEP), a natural gas development project comprised of six natural gas fields,
located 125 miles off the coast of Nova Scotia. SOEP began development drilling
in June 1998. First production is expected in late 1999 with facilities in place
to deliver natural gas at about 510 MMCFD (Mobil share, 260 MMCFD) plus 10 TBD
(Mobil share) of liquids. Natural gas from SOEP will be transported to the
Canadian Maritimes and the northeast U.S. via the Maritimes and Northeast
Pipeline (Mobil share, 12.5%) with a pipeline capacity of 900 MMCFD. The U.S.
portion of the pipeline received F.E.R.C. approval in July 1998. Construction
has begun in both the U.S. and Canada and is on track to be completed coincident
with first natural gas production from SOEP.

     The Terra Nova project (Mobil share, 22%), located 25 miles southeast of
Hibernia, received the necessary regulatory approvals and partner sanction in
1998. Construction is well underway with the start of hull and module
fabrication. At year end, the project was 37% complete. The FPSO system is set
to sail from Korea to Newfoundland in 1999. First production is targeted for
2001 with a peak production rate of 115 TBD (Mobil share, 25 TBD).

     In September, Mobil was awarded six new oil and natural gas exploration
licenses on the Grand Banks, offshore Newfoundland, Canada. The licenses,
totaling more than one million acres, bring Mobil's exploration holdings
offshore Grand Banks to 2.2 million gross acres (550,000 net acres). Mobil holds
between 30% and 50% interest in each of the six new licenses. Two licenses are
located in a new exploration area on the eastern edge of Canadian waters known
as the Flemish Pass Basin. The remaining four licenses are located within the
Jeanne d'Arc Basin, where the majority of offshore production and development is
currently concentrated.

     Mobil has a 40% interest in a joint venture with the Nigerian National
Petroleum Corporation (NNPC), on behalf of which it operates five Oil Mining
Leases (OML 67-70

                                      -7-
<PAGE>
 
Significant developments - continued

and 104) covering about 800,000 acres in shallow water offshore southeastern
Nigeria in the Niger delta. Mobil also operates two deepwater blocks under
Production Sharing Contracts with 50% working interest: OPL 221, a 565,000 acre
block in the southeast, and OPL 215, a 641,800 acre block in the western Niger
delta.

     Equity production in Nigeria in 1998 was 248 TBD, 2% less than 1997 due to
a pipeline break early in the year, somewhat minimized by new production from
the Oso-NGL project. Additionally, OPEC production restrictions, resulting from
prevailing soft crude prices, limited planned production growth. Proved reserves
replacement was 180% resulting primarily from appraisal/development drilling in
the joint venture acreage.

     The Oso-NGL project (Mobil share, 51%) began production in August and
averaged about 5 TBD of natural gas liquids for 1998. This is expected to
increase to 50 TBD (100% basis) in early 1999. Extracted liquids are transported
via the 42-mile pipeline to the Bonny River Terminal for further processing.

     Although there continues to be political uncertainty as the transition to
civilian rule progresses, to date there has been minimal impact upon Mobil's
Nigerian operations. However, management continues to monitor the situation.
Also, in common with other oil companies operating in Nigeria, Mobil's joint
venture with NNPC has encountered delays in receiving cash from NNPC to meet
joint venture expenditures.

     Production in Equatorial Guinea averaged 80 TBD (Mobil share, 50 TBD) in
1998, 35% more than in 1997 due to additional field development. Reserve
replacement was 417%. In addition to ongoing exploration drilling in Block B,
Mobil and its partner are increasing the production capacity at Zafiro field
from its current design level of 80 TBD to about 120 TBD in 2002.

     In March 1998, Mobil agreed to a revised Production Sharing Contract with
the government of Equatorial Guinea. Under the new agreement, Mobil's working
interest changed from 75% to 71.25%, with partner, Ocean Energy, holding 23.75%
and the government of Equatorial Guinea holding the remainder.

     Mobil, a subsidiary of Petroleos de Venezuela, S.A. (PDVSA), and an
affiliate of Veba AG signed an Association Agreement in 1997 outlining the terms
of a 35-year contract involving the production and upgrading of 120 TBD of
extra-heavy crude oil from Venezuela's Orinoco Tar Belt. In 1998, project
financing was obtained, major work contracts were awarded (i.e., drilling, field
facilities, pipelines, upgrader), and construction of the major facilities
began. Production startup is expected in late 1999 at 60 TBD (Mobil share,
41.67%). Upon startup, crude production will be partially upgraded in Venezuela
with final processing of most of the crude at the refinery located in Chalmette,
Louisiana, now owned by a partnership between Mobil and an affiliate of PDVSA.

     In Qatar, the Qatargas project (Mobil share, 10%) streamed the third
liquefaction train in March. In 1998, Qatargas delivered 66 LNG cargoes (about
3.6 million metric tons) to buyers in Japan, Spain and Turkey. Qatargas will
ultimately deliver 6 million metric tons annually (MMTA) of LNG to Japan. Peak
production volumes are expected to be 1,200 MMCFD of natural gas and 40 TBD of
condensate (Mobil share, 26 TBDOE). A short-term sale with Enagas of Spain was
extended to include 11 additional cargoes (three delivered in 1998 and eight for
1999 delivery). Additionally, Qatargas became one of the only producers to
market LNG in the

                                      -8-
<PAGE>
 
Significant developments - continued

established markets of Europe, the Far East, and the U.S., with U.S. sales
scheduled for delivery in 1999.

     Mobil has an interest in Ras Laffan Liquefied Natural Gas Company Ltd.
(RasGas), which is constructing a multi-train LNG facility. Completion and
hand-over of the first train offshore facilities occurred in November, one month
ahead of schedule. Startup of the first train onshore is expected in early 1999.
RasGas' existing sales contract with Korea Gas Corporation (KOGAS)for 4.8 MMTA
of LNG will support the production of 960 MMCFD of gas and 32 TBD of condensate
(Mobil share, 52 TBDOE). Mobil currently has a 26.5% interest in the first two
trains of RasGas. This interest will decrease to 25% when a Korean consortium
led by KOGAS exercises its option to acquire an equity interest in the project.

     Mobil and RasGas marked a major milestone with the signing of a Heads of
Agreement with Petronet (India) for the long-term supply of 7.5 MMTA of LNG into
Dahej and Cochin on India's west coast, beginning in 2002. In addition to the
LNG supply, Mobil and RasGas may participate in the downstream (import terminal)
development in India.

     In another India tender, the winning consortium, led by CMS Energy
Corporation (CMS), will develop new gas-fired power facilities at Ennore, Tamil
Nadu in southeast India. The Tamil Nadu project will require 1.8 MMTA of LNG in
2003, building to 2.5 MMTA with pipeline sales. A Memorandum of Understanding
signed by RasGas in 1998 with the CMS consortium offers RasGas exclusive rights
to supply natural gas to the consortium subject to negotiation of acceptable
terms and conditions.

     Mobil signed a Heads of Agreement with Qatar General Petroleum Corporation
detailing fiscal terms under which Mobil will progress the Enhanced Gas
Utilization (EGU) project in Qatar. This project is expected to deliver over 1
BCFD of natural gas to domestic and regional industries, as well as producing 40
TBD of condensate and 15 TBD of LPG (Mobil share, 85 TBDOE), beginning as early
as 2002.

New Exploration & Producing Ventures
South America
- -------------
- -  Peru: Mobil was a partner with Shell (operator) in three license blocks,
collectively known as Camisea. Terms of the Camisea license agreement required a
commitment in mid-1998 to develop the field with first production by 2002. In
mid-July, it was announced that Shell and Mobil were unable to resolve various
challenges to move the project forward within the timeframe stipulated by the
government; therefore, they could not commit to the second phase of the Camisea
project and the license expired.

     Mobil has a 42.5% interest in the Shell-operated Pagoreni license in Block
75, near Camisea. Mobil and Shell plan to continue with the exploration program
on Block 75 in 1999 and will seek an extension to the current exploration
period.

     Additionally, Mobil holds an interest in the Tambopata Block 78 in the
Madre de Dios Basin (Mobil share, 33.4%). Currently the Candamo 1X exploration
well is being drilled, with results expected in the second quarter of 1999.
After evaluating the results from the Candamo 1X well, Mobil and its partners,
Esso and Elf, will decide whether to enter the next period of the license.


                                      -9-
<PAGE>
 
Significant developments - continued

Europe
- ------
- - Italy: Mobil, ENI (Agip), Enterprise and Fina signed an agreement to jointly
purchase Lasmo's holdings in Italy. The holdings comprise Lasmo's interest in
seven blocks, in five of which Mobil already holds a position. Primary amongst
the blocks are Gorgoglione and Tempa d"Emma concessions which overlie the Tempa
Rossa heavy-oil field. The terms of the acquisition will give each of the four
owners a 25% interest in the unified development of the Tempa Rossa field. The 
agreement was finalized in early 1999.

Africa
- ------
- - Sao Tome and Principe: Mobil and Sao Tome and Principe National Petroleum Co.
signed a Technical Assistance Agreement to evaluate the hydrocarbon potential of
offshore acreage of the Democratic Republic of Sao Tome and Principe, an island
state located south of Nigeria and Equatorial Guinea in West Africa. Mobil is to
complete an 18-month technical evaluation including seismic acquisition and
interpretation of 22 deepwater blocks covering 12 million acres. Mobil will then
have an exclusive option to negotiate a production sharing contract on the
acreage.

Commonwealth of Independent States (Caspian Region)
- ---------------------------------------------------
- - Kazakhstan: In the Tengiz oil field (Mobil share, 25%), located on the eastern
shore of the Caspian Sea, the facility expansion and an upgrading of the crude
processing plant were completed in the fourth quarter of 1998 which increased
crude oil production to 210 TBD (Mobil share, 52 TBD). A new processing train is
expected to boost production to 240 TBD by mid-year 2000.

     Mobil is a 7.5% partner in the Caspian Pipeline Consortium (CPC), which is
developing a dedicated 900-mile crude export pipeline system from Tengiz via
Russia to the Black Sea port of Novorossyisk. In 1998, the governments of Russia
and Kazakhstan approved investment and construction feasibility studies. CPC
awarded contracts for the supply of pipe, and construction is scheduled to begin
in early 1999, with the pipeline projected to stream in late 2001. The initial
capacity is estimated at 560 TBD with a staged expansion increasing capacity to
approximately 1.4 million of barrels daily (MMBD) by 2010.

     The Production Sharing Agreement (PSA) for exploration, development, and
production of 11 blocks in Kazakhstan's sector of the Caspian Sea became
effective in 1998 (Mobil share, 14.3%). The Offshore Kazakhstan International
Operating Company (OKIOC) acts as operator on behalf of the participants in the
PSA. Pre-drill operations continued throughout 1998 with drilling of the first
exploratory well scheduled for mid-1999.

     In 1998, Mobil, Chevron, Royal Dutch/Shell and KazakhOil, signed an
agreement with the Republic of Kazakhstan to carry out a feasibility study for
oil and natural gas transportation systems from Kazakhstan to western markets.
The first phase of the study is expected to take a year with an estimated cost
of $8-10 million.

- - Turkmenistan: Mobil has a 40% interest in the onshore western Turkmenistan
Nebitdag license area, which includes the Burun field. By the end of 1998, Burun
was producing more than 14 TBD (Mobil share, 6 TBD) and production is projected
to increase to 20 TBD (Mobil share, 8 TBD) in 1999.

     In 1998, Mobil signed a PSA covering the 4,500 square kilometer area of
Garashsyzlyk or "Independence" which lies adjacent to Nebitdag and includes most
of Turkmenistan's onshore producing oil fields. The PSA enables Mobil to explore
for
                                     -10-
<PAGE>
 
Significant developments - continued

oil outside the boundaries of existing producing fields and also in deeper
areas below major fields such as Barsagelmes and Koturtepe. Mobil's partners are
Monument Oil and Gas plc. and Turkmenneft, the producing association of
Turkmenistan. The appraisal program is due to start in 1999.

- - Azerbaijan: Mobil holds a 50% interest and operatorship of the offshore Oguz
block. The remaining 50% interest is held by the State Oil Company of the
Azerbaijan Republic (SOCAR). The Oguz block, east of Baku in Azerbaijan's sector
of the Caspian Sea, is adjacent to the Neft Dashlary and Guneshli oil fields.
Technical work was pursued in 1998 to determine an optimum drilling location.
The Joint Operating Agreement (JOA) between Mobil and SOCAR was signed in August
1998. Drilling activities are expected to commence in early 2001.


                                     -11-
<PAGE>
 
Significant developments - continued

 Reserves

     Mobil is required to report reserve estimates to the U.S. Department of
Energy. During 1998 Mobil filed proved reserve estimates covering the year 1997
under forms EIA-23, Annual Survey of Domestic Oil and Gas Reserves, and EIA-28,
Financial Reporting System. EIA-23 is filed on the basis of 100% volumes for
domestic Mobil-operated fields which differs from the Securities and Exchange
Commission (S.E.C.) reporting basis. The latter requires disclosure on a net
working interest basis for both domestic and international reserves. As such,
volumes differ by more than 5%. The EIA-28 estimates, which are filed on the
same basis as the S.E.C. requirements, are essentially the same as the reserve
data filed with the S.E.C.

- --------------------------------------------------------------------------------
Wells in Process of Being Drilled                                Total
  at December 31, 1998                                      Gross       Net
- --------------------------------------------------------------------------------
United States ................................               22          5
International ................................               47         20
                                                             --         --
 Worldwide ...................................               69         25
                                                             ==         ==
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Improved Recovery Projects           Being Installed          In Operation
  at December 31, 1998               Gross       Net        Gross         Net
- --------------------------------------------------------------------------------
United States ..................       8          --         192          44
International ..................       5           1          73          37
                                     ---         ---         ---         ---
 Worldwide .....................      13           1         265          81
                                     ===         ===         ===         ===
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                            ------- International --------
Productive Wells at                   Asia-    Other           World-   Mult.
  December 31, 1998  U.S.   Europe   Pacific   Areas   Total    wide   Compl.(a)
- --------------------------------------------------------------------------------
Oil: Gross ......   9,832     846      570    1,766    3,182   13,014    520
     Net ........   1,747     229       90      989    1,308    3,055    249

Gas: Gross ......   6,123     477       88    1,004    1,569    7,692    531
     Net ........   2,953     131       88      291      510    3,463    350

(a) Multiple completions included in geographic totals.
- --------------------------------------------------------------------------------

                                     -12-
<PAGE>
 
Significant developments -- continued

- --------------------------------------------------------------------------------
Net Exploratory and                      ------- International --------
  Development Wells                               Asia-   Other         World-
  Drilled                         U.S.   Europe  Pacific  Areas   Total  wide
- --------------------------------------------------------------------------------
1996
Exploratory wells
  Productive ...................   21       3       1      45      49      70
  Dry ..........................   18      12       4      18      34      52
Development wells
  Productive ...................  293      13      12     100     125     418
  Dry ..........................    8      --       1       1       2      10

1997
Exploratory wells
  Productive ...................   13       1       1      23      25      38
  Dry ..........................    5       5       2      13      20      25
Development wells
  Productive ...................  229      10      17     209     236     465
  Dry ..........................    7      --       3      20      23      30

1998
Exploratory wells
  Productive ...................   17       1      15      21      37      54
  Dry ..........................   13       3      11      11      25      38
Development wells
  Productive ...................   80      13      14      79     106     186
  Dry ..........................   --       2       2      10      14      14
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Oil and Gas Acreage
  at December 31, 1998             Undeveloped Acreage      Developed Acreage
   (Thousands of acres)             Gross       Net          Gross       Net
- --------------------------------------------------------------------------------
United States ..................    4,327       2,670       3,907       2,577
                                
Europe .........................   18,465       5,339       1,593         562
Asia-Pacific ...................   48,327      17,374       1,264         188
Other ..........................   65,364      29,259       3,527       1,533
                                  -------     -------     -------     -------
  Total International ..........  132,156      51,972       6,384       2,283
                                  -------     -------     -------     -------
Worldwide ......................  136,483      54,642      10,291       4,860
                                  =======     =======     =======     =======

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


                                     -13-
<PAGE>
 
- --------------------------------------------------------------------------------
Average Sales Price/Transfer Value
- --------------------------------------------------------------------------------
     The following table shows Mobil's average sales price/transfer value
(transfer values are essentially equal to third-party sales prices) and average
production costs in oil and natural gas producing activities in 1996, 1997 and
1998. In calculating the "dollar per barrel" data, the divisor used is net
production. Natural gas volumes have been converted to oil equivalent barrels
and restated on a BTU (British Thermal Unit) basis, using 5,519 cubic feet of
gas per barrel. Mobil's share of equity companies represents Mobil's share of
after-tax results of operations for producing activities of investees accounted
for on the equity method. The geographic segment "Other Areas", in this table,
includes principally Canada, Kazakhstan, and West Africa.

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------
UNITED STATES                                            1996        1997        1998
- ---------------------------------------------------------------------------------------
<S>                                                  <C>         <C>         <C>     
Revenues
  Crude oil (per barrel) .........................   $  17.40    $  17.27    $  11.78
  NGL (per barrel) ...............................   $  13.16    $  11.96    $   8.26
  Natural gas (per thousand cubic feet) ..........   $   2.17    $   2.38    $   1.98
Average dollars per barrel of oil equivalent
  Revenues .......................................   $  13.48    $  14.13    $  10.75
  Production (lifting) costs .....................      (5.08)      (5.13)      (5.55)
  Exploration expenses ...........................       (.41)       (.53)      (1.07)
  Depreciation, depletion and amortization .......      (3.46)      (3.08)      (5.10)
  Other operating revenues/(expenses) ............       1.43         .73         .27
  Income tax expense .............................      (1.99)      (2.09)        .21
                                                     --------    --------    --------
Results of operations for producing activities ...   $   3.97    $   4.03    $   (.49)
                                                     ========    ========    ========
Mobil's share of equity companies ................         --        5.26        1.72
                                                     ========    ========    ========
Total ............................................   $   4.00    $   4.20    $   0.07
                                                     ========    ========    ========
Above results include the following special items:
  Asset impairment ...............................       (.37)         --        (.98)
  Litigation .....................................         --        (.07)       (.18)
  Asset sales ....................................        .65         .32          --
  Restructuring provisions .......................       (.04)         --          --
  Employee performance award .....................         --        (.02)         --

<CAPTION> 
- ---------------------------------------------------------------------------------------
EUROPE                                                   1996        1997        1998
- ---------------------------------------------------------------------------------------
<S>                                                  <C>         <C>         <C> 
Revenues
  Crude oil (per barrel) .........................   $  20.85    $  19.32    $  12.73
  NGL (per barrel) ...............................   $  17.47    $  18.09    $  11.04
  Natural gas (per thousand cubic feet) ..........   $   2.78    $   2.78    $   2.40
Average dollars per barrel of oil equivalent
  Revenues .......................................   $  17.62    $  16.34    $  13.10
  Production (lifting) costs .....................      (5.44)      (4.81)      (4.95)
  Exploration expenses ...........................      (1.17)       (.97)       (.94)
  Depreciation, depletion and amortization .......      (3.49)      (3.19)      (3.46)
  Other operating revenues/(expenses) ............        .71         .95        2.33
  Income tax expense .............................      (4.73)      (4.45)      (2.22)
                                                     --------    --------    --------
Results of operations for producing activities ...   $   3.50    $   3.87    $   3.86
                                                     ========    ========    ========
Mobil's share of equity companies ................   $   4.04    $   7.93          --
                                                     ========    ========    ========
Total ............................................   $   3.50    $   3.90    $   3.83
                                                     ========    ========    ========
Above results include the following special items:
  Asset sales ....................................         --          --         .42
  Employee performance award .....................         --        (.01)         --
</TABLE>


                                     -14-
<PAGE>
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------
ASIA-PACIFIC                                             1996        1997        1998
- ---------------------------------------------------------------------------------------
<S>                                                  <C>         <C>         <C>     
Revenues
  Crude oil (per barrel) .........................   $  20.92    $  19.78    $  12.94
  NGL (per barrel) ...............................   $  18.19    $  19.77    $  13.78
  Natural gas (per thousand cubic feet) ..........   $   2.50    $   2.51    $   2.35
Average dollars per barrel of oil equivalent
  Revenues .......................................   $  15.18    $  14.98    $  10.58
  Production (lifting) costs .....................      (2.01)      (2.04)      (1.94)
  Exploration expenses ...........................      (1.09)       (.60)       (.76)
  Depreciation, depletion and amortization .......      (2.12)      (2.36)      (2.74)
  Other operating revenues/(expenses) ............        .04         .18        (.26)
  Income tax expense .............................      (6.11)      (5.84)      (3.09)
                                                     --------    --------    --------
Results of operations for producing activities ...   $   3.89    $   4.32    $   1.79
                                                     ========    ========    ========
Mobil's share of equity companies ................          *           *    $      *
                                                     ========    ========    ========
Total ............................................   $   3.87    $   4.30    $   1.79
                                                     ========    ========    ========
Above results include the following special items:
 Asset impairment ................................         --          --        (.45)
 Asset sales .....................................       (.15)        .29          --
 Restructuring provisions ........................       (.03)         --          --
 Employee performance award ......................         --        (.01)         --
<CAPTION> 
- ---------------------------------------------------------------------------------------
OTHER AREAS                                              1996        1997        1998
- ---------------------------------------------------------------------------------------
Revenues
<S>                                                  <C>         <C>         <C>  
  Crude oil (per barrel) .........................   $  20.67    $  18.57    $  12.02
  NGL (per barrel) ...............................   $  16.54    $  16.05    $   9.41
  Natural gas (per thousand cubic feet) ..........   $    .89    $   1.22    $   1.24
Average dollars per barrel of oil equivalent
  Revenues .......................................   $  17.03    $  15.94    $  10.95
  Production (lifting) costs .....................      (5.46)      (5.29)      (4.89)
  Exploration expenses ...........................       (.95)      (1.28)      (1.73)
  Depreciation, depletion and amortization .......      (1.41)      (2.14)      (2.85)
  Other operating revenues/(expenses) ............       1.48        (.27)       (.54)
  Income tax expense .............................      (8.43)      (5.22)      (1.47)
                                                     --------    --------    --------
Results of operations for producing activities ...   $   2.26    $   1.74    $   (.53)
                                                     ========    ========    ========
Mobil's share of equity companies ................   $   2.02    $   2.52    $    .15
                                                     ========    ========    ========
Total ............................................   $   2.23    $   1.88    $   (.40)
                                                     ========    ========    ========
Above results include the following special items:
 Asset impairment ................................         --          --        (.83)
 Asset sales .....................................        .22          --          --
 Employee performance award ......................         --        (.01)         --

<CAPTION> 
- ---------------------------------------------------------------------------------------
WORLDWIDE                                                1996        1997        1998
- ---------------------------------------------------------------------------------------
Revenues
<S>                                                  <C>         <C>         <C> 
  Crude oil (per barrel) .........................   $  19.76    $  18.59    $  12.22
  NGL (per barrel) ...............................   $  15.48    $  15.21    $   9.86
  Natural gas (per thousand cubic feet) ..........   $   2.29    $   2.62    $   2.12
Average dollars per barrel of oil equivalent
  Revenues .......................................   $  15.61    $  15.36    $  11.34
  Production (lifting) costs .....................      (4.50)      (4.35)      (4.39)
  Exploration expenses ...........................       (.87)       (.86)      (1.18)
  Depreciation, depletion and amortization .......      (2.70)      (2.68)      (3.46)
  Other operating revenues/(expenses) ............        .94         .38         .38
  Income tax expense .............................      (5.01)      (4.41)      (1.64)
                                                     --------    --------    --------
Results of operations for producing activities ...   $   3.47    $   3.44    $   1.05
                                                     ========    ========    ========
Mobil's share of equity companies ................   $   2.26    $   3.63    $    .93
                                                     ========    ========    ========
Total ............................................   $   3.42    $   3.46    $   1.03
                                                     ========    ========    ========
Above results include special items, net .........        .08         .12        (.58)
</TABLE>

* Not meaningful due to the exploratory nature of related activities.


                                     -15-
<PAGE>
 
      PETROLEUM OPERATIONS -- DOWNSTREAM

Refining

     Mobil's primary product supply comes from 23 refineries. Mobil's share of
crude oil refinery capacity was 2,177 TBD, about 36% of which was located in the
United States. Worldwide utilization of Mobil's refining capacity averaged 94%
in 1996, 1997, and 1998.

Significant developments in 1998 in Mobil's refining operations included the
following:

- -    In September, the refinery in Paulsboro, New Jersey was sold to Valero
     Energy Corporation. Mobil signed 10-year agreements to buy fuels and
     lubricant base stocks from Valero, with an option to extend those
     agreements.

- -    At Llandarcy, South Wales, Mobil and The British Petroleum p.l.c. (BP)
     completed the previously announced closing of a stand-alone lubes refinery.

- -    In Barbados, as agreed with the local government, Mobil closed its
     refinery, completing the company's withdrawal from the Barbados market.


Marketing
- --------------------------------------------------------------------------------
Petroleum Sales Volumes By Product (TBD)           1996      1997      1998
- --------------------------------------------------------------------------------

  Automotive gasolines ..........................  1,317     1,304     1,363
  Jet fuels .....................................    273       297       319
  Distillates ...................................  1,026       983       950
  Other products ................................    729       759       808
                                                   -----     -----     -----
  Total* ........................................  3,345     3,343     3,440
                                                   =====     =====     =====
*Includes Mobil's share of the BP alliance 
- --------------------------------------------------------------------------------

     Mobil markets petroleum products extensively in the U.S. and in almost 100
other countries. Mobil has over 15,000 retail outlets, about 48% of which are
located in the United States. Petroleum products include automotive and aviation
gasolines, motor oils, lubricants and greases, marine fuels, jet fuels, fuel
oil, diesel oil, kerosene, asphalts, naphthas, solvents, waxes and liquefied
petroleum gas.

     The principal brand names identifying Mobil's products are "Mobil(R)
Unleaded", "Mobil Super+(R) ", "Mobil(R) Special", "Mobil(R) Regular", and
"Mobil(R) Premium" gasolines, and "Mobiloil(R)", "Mobilheat(TM)",
"Mobilgrease(R)", "Mobil 1(R)", "Delvac 1(R)", and "Mobil(R)" industrial and
marine lubricants and process products.

     In Latin America, Mobil entered the Venezuelan fuels business,
supplementing the growing fuels businesses in Colombia, Peru and Ecuador.


                                     -16-
<PAGE>
 
Tankers

     At December 31, 1998, Mobil owned 19 ocean-going tankers with an aggregate
of 2,760 thousand deadweight tons (DWT). An additional 16 tankers, aggregating
1,111 DWT, were under term charter, including Mobil's very large crude carriers
(VLCCs), RAVEN and EAGLE. In January 1999, a new double hulled VLCC, OSPREY, was
delivered to the Mobil fleet. Her sister ship, ALREHAB, will be delivered in
June 1999. Both vessels are owned by Samoco L.L.C., a joint venture company in
which Mobil holds a 50% interest. In addition, two double hulled Aframax tankers
with a combined capacity of 160 DWT are to join the fleet in October and
December of 1999. They are owned by QM Tanker. Mobil holds a 50% interest in
this company as well. A new joint venture company, MARCARE Shipping Co., LLC,
was established in 1998 by Mobil and two new partners, Onassis and Goulandris,
both premier companies in the industry. MARCARE, equally owned by the three
partners, has contracted for two more new VLCCs for use by Mobil. These are
scheduled for delivery in 2000 and will be the fifth and sixth new double-hull
VLCCs to enter Mobil's service.

Pipelines

     At December 31, 1998, Mobil's U.S. pipeline system, including partly-owned
facilities, consisted of 12,581 miles of crude oil, natural gas liquids, natural
gas, and carbon dioxide trunk and gathering lines, and 8,251 miles of product
lines. Also at that date, Mobil's pipeline system outside the U.S., including
partly-owned facilities, consisted of 10,562 miles of crude oil, natural gas
liquids, and natural gas trunk and gathering lines, and 2,878 miles of product
lines.

      CHEMICAL OPERATIONS

     Mobil Chemical, with manufacturing operations in 10 countries, is a large
producer of petrochemicals, packaging films and specialty chemical products.

- --------------------------------------------------------------------------------
Mobil Chemical Facilities                         United      Inter-     World-
 at December 31, 1998                             States     national    wide
- --------------------------------------------------------------------------------
Petrochemicals (a) ............................      6          7         13
OPP Films .....................................      3          4          7
Chemical Specialties ..........................      3          2          5
Research and Development ......................      3         --          3
                                                    --         --         --
 Total Chemical facilities ....................     15         13         28
                                                    ==         ==         ==

  (a) Includes one partly-owned facility in the U.S. and six in International.
- --------------------------------------------------------------------------------

Principal chemical products include basic petrochemicals (ethylene, propylene,
benzene, paraxylene), intermediates (ethylene glycol) and a key derivative
(polyethylene). Other products include synthetic lubricant base stocks and lube
additives, and plastic films for packaging and industrial applications.


                                     -17-
<PAGE>
 
Chemical Operations -- continued

Significant developments in 1998 in Mobil's chemical operations included the
following:

- -    Mobil Yanbu Petrochemical Company and Saudi Basic Industries Corporation
     are expected to complete by mid-2000 a major expansion of their 50-50 joint
     venture petrochemicals complex in Yanbu, Saudi Arabia. This expansion will
     include a second ethylene production facility and facilities to produce
     additional polyethylene, ethylene glycol and polypropylene.


- -    Mobil and Pequiven, the Venezuelan state-owned petrochemical company, are
     engaged in Phase I engineering studies to develop a new olefins complex at
     an existing petrochemicals site at Jose, Venezuela. The facility will
     include an ethylene cracker and related facilities to produce polyethylene
     and ethylene glycol.

- -    A modernization and expansion of the Beaumont, Texas olefins plant is
     scheduled for completion with start-up planned for early 1999.

- -    Mobil and Hoechst AG decided not to proceed with the proposed joint venture
     to combine their oriented polypropylene (OPP) flexible films business.


     OTHER OPERATIONS

Research

     Mobil engages in research and development, principally in the U.S.,
Australia, France, Germany, Japan, Norway and the United Kingdom. Activities
include the development of technologies and services which improve Mobil's
competitiveness in core business areas -- finding oil and gas, and converting
them to fuels, lubricants and chemicals while meeting environmental, health and
safety standards. Annual research expense was $206 million in 1996, $234 million
in 1997, and $204 million in 1998.


                                     -18-
<PAGE>
 
Item 2.  Properties.

     Mobil and its subsidiaries own, lease or have interests in extensive
production, manufacturing, marketing, transportation and other facilities
worldwide. Information on these properties has been incorporated into Item 1.
Business.

Item 3.  Legal Proceedings.

     Environmental Litigation

     Mobil periodically receives notices from the U.S. Environmental Protection
Agency (EPA) or equivalent agencies at the state level that Mobil is a
"potentially responsible party" under Superfund or equivalent state legislation
with respect to various waste disposal sites. Most of these sites are either
still under investigation by the EPA or the state agencies concerned, or under
remediation, or both. In certain instances, Mobil and other potentially
responsible parties have been named in court or administrative proceedings by
federal or state agencies seeking the cleanup of these sites. The relief
normally sought in the proceedings is the payment by the potentially responsible
parties of the costs of removing hazardous substances from, and remediating, the
sites in question. Mobil has also been named as a defendant in various suits
brought by private parties alleging injury from disposal of wastes at these
sites. The ultimate impact of these proceedings on the business or accounts of
Mobil cannot be predicted at this time due to the large number of other
potentially responsible parties and the speculative nature of clean-up cost
estimates, but based on our long experience in managing environmental matters,
we do not anticipate that the aggregate level of future remediation costs will
increase above recent levels so as to materially and adversely affect our
consolidated financial position or liquidity.

     On December 9, 1998, the Environmental Protection Agency of South Australia
issued an Information and Summons to Mobil Refining Australia Pty LTD alleging
the violation of two sections of the Environment Protection Act, 1993 of South
Australia by reason of a discharge of a gas, ethyl mercapatan, into the
environment. The maximum penalty for an offense for a body corporate is
(Australian) $250,000.

     The matter described in the preceding paragraph is not of material
importance in relation to Mobil's accounts and is described in compliance with
S.E.C. rules regarding disclosure of such matters although not material.

     Other Than Environmental Litigation

     Mobil and its subsidiaries are engaged in various litigations and have a
number of unresolved claims pending. While the amounts claimed are substantial
and the ultimate liability in respect of such litigations and claims cannot be
determined at this time, Mobil is of the opinion that such liability, to the
extent not provided for through insurance or otherwise, is not likely to be of
material importance in relation to its financial condition and results of
operations.

     Mobil has provided in its accounts for items and issues not yet resolved
based on management's best judgement.

Item 4.  Submission of Matters to a Vote of Security Holders.

     None submitted.


                                     -19-
<PAGE>
 
<TABLE> 
<CAPTION> 
- --------------------------------------------------------------------------------------------------------
                      Executive Officers of the Registrant
- --------------------------------------------------------------------------------------------------------

   Name (Age)               Position(s) Held During Past Five Years                        Years Held  
- -----------------   --------------------------------------------------------------       ---------------
<S>                 <C>                                                                  <C>  
Louis W.              Executive Vice President, Mobil Oil Corporation,
 Allstadt (55)          responsible for the Americas Exploration and
                        Producing Business...............................................1998-Present
                      Operating Officer, North American Exploration and
                        Producing, Mobil Oil Corporation.................................1996-1998
                      Vice President, Supply, Trading & Transportation,
                        Marketing & Refining Division, Mobil Corporation.................1995-1996
                      Chairman and President, Mobil Sekiyu Kabushiki
                       Kaisha............................................................1992-1995

Robert F.             Vice President, Human Resources....................................1996-Present
 Amrhein (56)         Manager, Human Resources, Mobil Business
                        Resources Corporation............................................1995-1996
                      Manager, Employee Relations, Exploration and
                        Producing Division, Mobil Oil Corporation........................1992-1995

Walter R.             Treasurer..........................................................1995-Present
 Arnheim (54)         Vice President, Planning and Economics.............................1991-1995

Brian R.              Executive Vice President, Mobil Oil Corporation,
 Baker (54)             responsible for the North American Marketing &
                        Refining Business................................................1998-Present
                      Chief Operating Officer, North American Marketing &
                        Refining and Executive Vice President, Mobil Oil
                        Corporation......................................................1996-1998
                      Vice President and General Manager, East Fuels
                        Business & Supply, Marketing & Refining Division,
                        Mobil Oil Corporation............................................1994-1996

Harold R.             Executive Vice President, Chief Financial Officer..................1998-Present
 Cramer (48)          President, Mobil Europe and Central Asia Limited...................1996-1998
                      President, Mobil Europe Limited....................................1996-1996
                      President, Mobil South, Inc........................................1993-1996

Steven L.             Controller, Principal Accounting Officer...........................1998-Present
 Davis (45)           Assistant Treasurer, Chevron Corporation...........................1997-1998
                      Comptroller, Chevron Products Company..............................1996-1997
                      Vice President - Finance, Chevron International
                        Oil Company......................................................1991-1996

Thomas C.             Executive Vice President, Mobil Oil Corporation,
 DeLoach, Jr.          responsible for the Global Midstream Business.....................1998-Present
 (51)                 Senior Vice President, Chief Financial Officer.....................1994-1998

Samuel H.             Senior Vice President..............................................1998-Present
 Gillespie III        Vice President.....................................................1996-1998
 (56)                 General Counsel....................................................1995-Present
                      Associate General Counsel..........................................1994-1995
- --------------------------------------------------------------------------------------------------------
</TABLE> 

                                     -20-
<PAGE>
 
<TABLE> 
<CAPTION> 
- -------------------------------------------------------------------------------------------------------
                Executive Officers of the Registrant (concluded)
- -------------------------------------------------------------------------------------------------------

   Name (Age)               Position(s) Held During Past Five Years                        Years Held  
- --------------------  ----------------------------------------------------------------  ---------------
<S>                   <C>                                                               <C> 
Aldis V.              Vice President, Planning and Economics.............................1995-Present
 Liventals (56)       Vice President, Middle East and Marine Transportation
                        Marketing and Refining Division, Mobil Oil
                        Corporation......................................................1993-1995

Raymond J.            Executive Vice President, Mobil Oil Corporation,
 McGowan (60)           responsible for the Global Chemicals Business....................1998-Present
                      Vice President & General Manager, Petrochemicals,
                        Mobil Chemical Company...........................................1994-1998

Lucio A.              Chairman of the Board and Chief Executive Officer..................1994-Present
 Noto (60)            President and Chief Operating Officer..............................1993-1998

Stephen D.            Executive Vice President, Mobil Oil Corporation,
 Pryor (49)             responsible for the International Marketing and
                        Refining Business................................................1998-Present
                      President, Mobil Asia Pacific Pty. Ltd.............................1996-1997
                      Vice President and General Manager, Plastics, Mobil
                        Chemical Company.................................................1994-1995

Michael P.            Executive Vice President, Mobil Oil Corporation,
 Ramage (55)            responsible for the Global Technology Business...................1998-Present
                      Chief Technology Officer...........................................1995-Present 
                      President, Mobil Technology Company................................1995-Present
                      Vice President, Engineering, Mobil Technology
                        Company..........................................................1994-1995

Eugene A.             President and Chief Operating Officer..............................1998-Present
 Renna (54)           Executive Vice President, responsible for the
                       North America Marketing and Refining, Europe/Former
                       Soviet Union, South America and Supply, Trading
                       and Transportation Business Groups................................1996-1998
                      Executive Vice President, Marketing and Refining
                        Division, Mobil Oil Corporation..................................1986-1996

M.W.(Bill)            Executive Vice President, Mobil Oil Corporation,
 Scoggins (51)          responsible for the International Exploration and
                        Producing Business...............................................1998-Present
                      Operating Officer, E&P Ventures/Global Exploration,
                        Mobil Oil Corporation............................................1997-1998
                      Operating Officer, Africa and Middle East, Mobil Oil
                        Corporation......................................................1996-1997
                      President, Mobil Oil Indonesia Inc.................................1994-1996
- -------------------------------------------------------------------------------------------------------
</TABLE> 


                                     -21-
<PAGE>
 
                                     PART II

     The information required by Items 5 through 7A is incorporated herein by
reference to Mobil's 1998 Annual Report to Shareholders. The charts, graphs and
associated captions appearing on pages 14 through 37 of Mobil's 1998 Annual
Report to Shareholders are not incorporated into this Annual Report on Form
10-K. Below is an index to the incorporated information.

                                                         1998 Annual Report
                                                            To Shareholders
Item                      Description                           Page(s)  
- ----  ----------------------------------------------------  --------------  
 5.   Market for Registrant's Common Stock and Related
        Stockholder Matters ..............................              29
 6.   Selected Financial Data ............................              63
 7.   Management's Discussion and Analysis of Results of
        Operations and Financial Condition ...............     14-30,32,34
7A.   Quantitative and Qualitative Disclosures About
        Market Risk ......................................           22,23

Item  8.  Financial Statements and Supplementary Data.

     See page 23 for a list of the financial statements and supplementary data
including those incorporated herein by reference to Mobil's 1998 Annual Report
to Shareholders.

Item 9. Changes in and Disagreements with Accountants on Accounting and
        Financial Disclosure.

  None.

                                    PART III

Item 10.  Directors and Executive Officers of the Registrant.

Item 11.  Executive Compensation.

Item 12.  Security Ownership of Certain Beneficial Owners and
            Management.

Item 13.  Certain Relationships and Related Transactions.

     For Item 10, the names and ages of the Executive Officers of Mobil as of
March 1, 1999, and the position(s) each of them has held during the past five
years, are provided on pages 20 and 21 of this Annual Report on Form 10-K. The
other information called for by Item 10, and the information called for by Items
11, 12 and 13, is incorporated by reference to the Registrant's definitive proxy
statement for its Annual Meeting of Shareholders, to be held on May 27, 1999,
which will be filed with the S.E.C. within 120 days after December 31, 1998.


                                     -22-
<PAGE>
 
                                     PART IV

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


     Mobil's consolidated financial statements, together with the report thereon
of Ernst & Young LLP, independent auditors, dated February 26, 1999, and
Supplementary Information appearing in Mobil's 1998 Annual Report to
Shareholders on the pages indicated below, are incorporated herein by reference.
With the exception of the aforementioned information, no other data appearing in
Mobil's 1998 Annual Report to Shareholders are deemed to be filed as part of
this Annual Report under Items 8 and 14. Any chart, graph and/or associated
caption appearing in the consolidated financial statements of Mobil's 1998
Annual Report to Shareholders are not incorporated into this Annual Report on
Form 10-K.

Financial Statement Schedules:                              Page(s)
                                                   -----------------------------
                                                   1998 Annual      1998 Annual
                                                   Report on        Report to
                                                   Form 10-K       Shareholders
                                                   ---------       ------------
(a)1.  Financial Statements 
   Consolidated Statement of Income ..............      --               31
   Consolidated Statement of Changes in
    Shareholders' Equity .........................      --               31
   Consolidated Balance Sheet ....................      --               33
   Consolidated Statement of Cash Flows ..........      --               35
   Segment and Geographic Information ............      --            36,37
   Notes to Financial Statements .................      --            38-52
   Report of Ernst & Young LLP, Independent
    Auditors .....................................      --               53
   Supplementary Information .....................      --         29,54-59

(a)2.  Financial Statement Schedules .............

    Schedule II -- Valuation and Qualifying
    Accounts .....................................      25               --

     Schedules not included above have been omitted because they are not
applicable, not material, or the required information is given in the financial
statements or notes thereto or combined with the information presented in other
schedules.


(a)3.  Exhibits

     An index to exhibits filed as part of this Annual Report on Form 10-K is
included on pages 27 and 28.


                                     -23-
<PAGE>
 
(b) Reports on Form 8-K.

    Date of 8-K                         Description of 8-K     
- -----------------   ------------------------------------------------------------
              
November 27, 1998   Submitted a copy of the Mobil Corporation News Release dated
                    November 27, 1998 confirming Exxon and Mobil discussions
                    concerning a possible combination transaction.

December 2, 1998    Submitted a copy of the following exhibits relating to a
                    possible combination transaction with Exxon:

                    -    Agreement and Plan of Merger, dated as of December 1,
                         1998, among Mobil, Exxon and Merger Subsidiary;

                    -    Stock Option Agreement, dated as of December 1, 1998,
                         between Mobil and Exxon; and

                    -    Mobil and Exxon Joint Press Release dated December
                         1,1998, confirming that Exxon and Mobil have signed a
                         definitive agreement to merge the two companies.

January 27, 1999    Submitted a copy of the Mobil Corporation News Release dated
                    January 27, 1999 reporting estimated earnings for the fourth
                    quarter and full year of 1998.



                                     -24-
<PAGE>
 
(c)   Supplemental Financial Information.

                          FINANCIAL STATEMENT SCHEDULE
- --------------------------------------------------------------------------------
                                MOBIL CORPORATION
                SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS
                       For the Years Ended December 31,
                               1996, 1997 and 1998
                              (Millions of dollars)
- --------------------------------------------------------------------------------
                                    Balance                           Balance
                                   Beginning                          End of
Description                        of Period   Additions  Deductions  Period
- -----------------------------     ---------   ---------   ----------   -------

For the year ended 
  December 31, 1996:
Reserves deducted in the 
  balance sheet from the 
  assets to which they apply:
    For doubtful accounts (a) ...... $106        $ 61        $ 51     $116
    For investments and                                    
      long-term receivables ........   40          17           2       55
    For deferred tax assets (b) ....  368          62          12      418
Reserves related to restructuring ..  533         222         387      368
For the year ended                                         
  December 31, 1997:                                       
Reserves deducted in the                                   
  balance sheet from the                                   
  assets to which they apply:                              
    For doubtful accounts (a) ...... $116        $130        $ 99     $147
    For investments and                                    
      long-term receivables ........   55           9          14       50
    For deferred tax assets (b) ....  418         237          28      627
Reserves related to restructuring ..  368         272         340      300
For the year ended                                         
  December 31, 1998:                                       
Reserves deducted in the                                   
  balance sheet from the                                   
  assets to which they apply:                              
    For doubtful accounts (a) ...... $147        $105        $113     $139
    For investments and                                    
      long-term receivables ........   50           6          --       56
    For deferred tax assets (b) ....  627         101         120      608
Reserves related to restructuring ..  300          50         181      169
                                                               
                                                            
     (a)  Deductions include accounts written off.

     (b)  Deductions reflect net utilization of tax credit carryforwards and
          1998 also reflects write-off of tax loss carryforwards.
- --------------------------------------------------------------------------------


                                     -25-
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant, Mobil Corporation, has duly caused this
report to be signed on its behalf by the undersigned, thereunto duly authorized.

                              REGISTRANT       MOBIL CORPORATION

                                           By: /s/ Steven L. Davis
                                              -----------------------------
                                              (Steven L. Davis, Controller,
                                              Principal Accounting Officer)
                                              Date: March 31, 1999

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on March 31, 1999 on
behalf of the registrant and in the capacities indicated.

       Signature                             Title
       ---------                             -----

      Lucio A. Noto*            Director, Chairman of the Board and
- -------------------------            Chief Executive Officer
     (Lucio A. Noto)              


     Harold R. Cramer*          Principal Financial Officer
- -------------------------
    (Harold R. Cramer)


     Steven  L.  Davis*         Controller, Principal Accounting Officer
- -------------------------
    (Steven  L.  Davis)

DIRECTORS
   Lewis M. Branscomb*
   Donald V. Fites*
   Charles A. Heimbold, Jr.*
   Allen F. Jacobson*
   Samuel C. Johnson*
   Helene L. Kaplan*
   J. Richard Munro*
   Aulana L. Peters*
   Eugene A. Renna*
   Charles S. Sanford, Jr.*
   Robert G. Schwartz*
   Iain D. T. Vallance*

*By /s/ Gordon G. Garney                     
    --------------------------------------
      (Gordon G. Garney, Attorney-in-fact)
Date:  March 31, 1999


                                     -26-
<PAGE>
 
                                  EXHIBIT INDEX

               EXHIBIT                             SUBMISSION MEDIA 
- ------------------------------------------   -----------------------------------
2.1     Agreement and Plan of Merger dated   Incorporated by reference to       
        as of December 1, 1998 among Mobil   Exhibit 2.1 filed on Form 8-K filed
        Corporation, Exxon Corporation and   December 2, 1998.
        Lion Acquisition Subsidiary                                             
        Corporation.                                                            

2.2     Stock Option Agreement dated as of   Incorporated by reference to 
        December 1, 1998 between Exxon       Exhibit 2.2 filed on Form 8-K filed
        Corporation and Mobil Corporation.   December 2, 1998.             

3(i).1  Certificate of Incorporation Mobil   Incorporated by reference to     
        Corporation, as amended, in effect   Exhibit of 3(i).1 filed on Form  
        May 20, 1997.                        8-K, July 11, 1997.          

3(i).2  Certificate of Designation,          Incorporated by reference to       
        Preferences and Rights of Series A   Exhibit 3-a(ii) to the Registration
        Junior Participating Preferred       Statement on Form S-3 (S.E.C. File
        Stock of Mobil Corporation dated     No. 33-32651), filed under Form SE
        April 25, 1986.                      dated December 14, 1989.          
                                             
3(i).3  Certificate of Designation,          Incorporated by reference to       
        Preferences and Rights of Series B   Exhibit 3(i).2 filed on Form 8-K,  
        ESOP Convertible Preferred Stock of  July 11, 1997.                    
        Mobil Corporation, as amended, in                                       
        effect May 20, 1997.                                                    
                                             
3(ii).4 By-laws of Mobil Corporation, as     Incorporated by reference to      
        amended to June 14, 1995.            Exhibit 3.4 filed on Form 8-K date
                                             July 6, 1995.                     
                                             
10.1    1995 Mobil Incentive Compensation    Incorporated by reference to
        and Stock Ownership Plan.            Definitive Proxy Statement filed   
                                             March 20, 1995.                    

10.2    1991 Mobil Incentive Compensation    Incorporated by reference to       
        and Stock Option Plan.               Exhibit 15 to the Registration     
                                             Statement on Form S-8 (S.E.C. File 
                                             No. 33-48887) filed August 10,     
                                             1992.                              

10.3    1986 Mobil Incentive Compensation    Incorporated by reference to      
        and Stock Option Plan.               Exhibit 15 to the Registration    
                                             Statement on Form S-8 (S.E.C. File
                                             No. 33-5797) filed May 20, 1986.  

10.4    Mobil Oil Corporation's Executive
        Life Insurance Program               Electronic


                                     -27-
<PAGE>
 
EXHIBIT INDEX - Concluded

                EXHIBIT                             SUBMISSION MEDIA  
- -----------------------------------------   --------------------------------
10.5    Supplemental Employees Savings       Electronic  
        Plan of Mobil Oil Corporation                   

12.     Computation of Ratio of Earnings     Electronic
        to Fixed Charges.  (Page 29)

13.     Mobil Corporation 1998 Annual        Electronic
        Report to Shareholders.

21.     Subsidiaries of the Registrant.      Electronic
        (Pages 30-32)

23.     Consent of Ernst & Young LLP,        Electronic
        Independent Auditors, dated
        March 26, 1999.  (Page 33)

24.1    Power of attorney dated as of        Electronic
        February 26, 1999, executed by
        the Board of Directors of Mobil
        Corporation authorizing execution
        of Annual Report on Form 10-K.

24.2    Certified copy of Board of           Electronic
        Directors' Resolutions adopted    
        February 26, 1999, authorizing                                         
        signature by officers pursuant to                                      
        power of attorney.                                                     
                                             
27.     Financial Data Schedule.             Electronic


                                     -28-

<PAGE>
 
- --------------------------------------------------------------------------------
                                  Exhibit 10.4
- --------------------------------------------------------------------------------




             EXECUTIVE LIFE INSURANCE PLAN OF MOBIL OIL CORPORATION

                            Effective July 24, 1998


1. Purpose. The purpose of this Plan is, as part of a total compensation and
   -------
benefits package that is designed to attract and retain key employees, to
provide a means of assisting senior executives to obtain improved life insurance
coverage and to provide a cost effective estate building and estate planning
vehicle for senior executives.

2. Definitions. The following definitions apply to this Plan.
   -----------

"Actively at Work" describes a person who is working full time in his or her
customary place of employment and performing all the duties and responsibilities
of his or her regular occupation (or who is away from work on vacation or other
approved paid leave) and who has not been absent from work due to illness or
medical treatment for a period of more than five consecutive working days in the
most recent three months.

"Change in Control" has the meaning set forth in the Mobil Corporation Employee
Severance Plan adopted September 25, 1998, as amended from time to time, or any
successor thereto.

"Collateral Assignment" means a Limited Collateral Assignment of Life Insurance
Policy substantially in the form attached hereto as Exhibit B, approved by the
Company from time to time.

"Company" means Mobil Oil Corporation.

"Early Retirement" means termination of employment with the Company or its
affiliates after attaining age 50 and after completing 10 years of vesting
service under the Retirement Plan of Mobil Oil Corporation, but prior to
attaining age 55.

"Employee" means a person who meets the eligibility requirements of Section 3.

"Insurance Agreement" means an Executive Life Insurance Agreement, substantially
in the form attached as Exhibit A, approved by the Company from time to time.

"Insurer" means the Metropolitan Life Insurance Company.
<PAGE>
 
"Owner" means the natural person or trust who or which owns a Policy hereunder
and enters into (or subsequently is assigned the rights and obligations under)
an Insurance Agreement and a Collateral Assignment with respect to such Policy.

"Plan" means this Executive Life Insurance Plan.

"Policy" means a policy of insurance on the life of an Employee, issued by the
Insurer, conforming to the Insurance Agreement.

"Retirement" means (a) termination of employment with the Company or its
affiliates after attaining age 55 and completing 10 years of vesting service
under the Retirement Plan of Mobil Oil Corporation or (b) Early Retirement with
prior Company consent.

3. Eligibility. Any regular, U.S. payroll employee of Mobil Corporation or any
   -----------
of its direct or indirect subsidiaries in a position evaluated by the Company as
Salary Group 25 or above who is eligible to participate in the Mobil Oil
Corporation program of U.S. benefit plans shall be eligible to participate in
the Plan, provided that such person is actively at work on the date of
enrollment and provided further that such person is resident in the U.S. or a
country in which the Insurer can lawfully issue a Policy. Any person who meets
the preceding requirements immediately prior to termination of employment shall
continue to participate, except as provided Section 12 of the applicable
Insurance Agreement; provided that any Employee whose termination of employment
constitutes an Early Retirement may, in the discretion of the Company, continue
to participate in the Plan as if he or she had qualified for Retirement.

4. Enrollment. An Employee may enroll in the Plan within the first 120 days of
   ----------
eligibility without submitting proof of good health or other evidence of
insurability. An Employee who ceases to participate in the Plan because he or
she has ceased to meet the employment requirement for eligibility may re-enroll
in the Plan within 120 days after again becoming eligible to participate without
submitting proof of good health or other evidence of insurability. An Employee
who wishes to enroll in the Plan after the first 120 days of eligibility, or who
wishes to re-enroll other than as provided in the previous sentence, will be
required to provide evidence of good health or other evidence of insurability
satisfactory to the Insurer. The Insurer may require a physical examination by a
physician of its choice, which examination shall be at no cost to the Employee.

To enroll (or re-enroll), the Employee (or Owner) must (a) agree to make any
required contributions; (b) submit an application to the Insurer for a Policy;
and (c) sign a Collateral Assignment and an Insurance Agreement. In addition, an
Employee required to provide proof of good health or other evidence of
insurability cannot be enrolled unless and until the Insurer accepts such proof
or evidence, which acceptance may be subject to such conditions as the Insurer
may impose.

5. Contributions. The Owner shall be required, as a condition of receiving any
   -------------
benefits under this Plan, to make contributions toward the cost of the Policy.
The 
<PAGE>
 
required contributions for all Employees, up until the date they attain age 65,
shall be $0.15 per month per $1000 of coverage. In addition, in the case of any
Employee who enrolls later than 120 days after the date of first eligibility for
enrollment (or re-enrollment, as applicable) and who consequently is required by
the Insurer to pay a higher cost of insurance than the cost that would have
applied if the Employee had enrolled (or re-enrolled) during the first 120 days
of eligibility, the Owner shall be required to pay the increased cost of
insurance each year.

6. Benefits. The benefits shall be as set forth in the applicable Insurance
   --------
Agreement attached as an Exhibit hereto, and subject to the following special
rules: The amount of additional payments to fully fund the Policies pursuant to
Section 13 of the applicable Insurance Agreement shall be determined on the
basis of the Insurer's mortality assumptions that would apply in the case of an
Employee who enrolled (or re-enrolled) within the first 120 days of eligibility
and shall be based on an assumed investment return for the Policy of 7.5% net of
expenses. The Employee (or Owner) shall fill in the number of years over which
such additional payments are made in Section 13 of the applicable Insurance
Agreement. Subsequent changes to such number of payments may be made at such
times and on such terms and conditions as provided in rules promulgated by the
Vice President, Human Resources. In any case in which a period has not been
elected, initially or within the time permitted for any change, a period of
three years shall be deemed to have been elected.

7. Loss of Benefits. Employee will cease to be eligible for participation in the
   ----------------
Plan for the reasons set forth in Section 12 of the applicable Insurance
Agreement, except that clause (c) of such Section 12 shall not apply in the case
of a Retirement as defined above. When an Employee ceases to participate in the
Plan prior to age 65, the cash surrender value of the Policy shall be paid to
the Company, and the Company shall make no further payments in respect of the
Policy. The Owner may apply to the Insurer to continue the Policy at the Owner's
expense.

8. General Provisions; Administration; Claims and Appeals. The general
   ------------------------------------------------------
provisions of the Plan and provisions relating to administration, claims and
appeals are set forth in the Insurance Agreements and are incorporated herein by
reference.

9. Amendment or Termination. The Company shall have the right to amend or
   ------------------------
terminate the Plan at any time, subject to the limitations set forth in the
Insurance Agreement; provided that upon the occurrence of a Change in Control,
notwithstanding anything to the contrary in the Insurance Agreement, the Company
shall cease to have any right to amend or terminate the Plan or take any action
(other than termination of the Employee for "cause" as defined in the Mobil
Corporation Employee Severance Plan) that would in any way impair the benefit
under the Plan to or in respect of any Employee then covered by a Policy without
the consent of the Employee or other Owner, as applicable.
<PAGE>
 
                                                                       EXHIBIT A


                       EXECUTIVE LIFE INSURANCE AGREEMENT



     THIS AGREEMENT made and entered into this ______ day of ___________, 1998,
effective _________ ___ , 1998, by and among Mobil Oil Corporation, a New York
corporation (the "Corporation"), ________________________ (the "Employee"), and
__________________________, Trustee, or successor trustee of the
___________________ Irrevocable Insurance Trust U / A _____________ ___, 19__
(the "Owner").

     WHEREAS, the Employee is a valued employee of the Corporation (or an
affiliate of the Corporation) whom the Corporation wishes to assist with
obtaining personal life insurance protection; and

     WHEREAS, the Corporation agrees to participate in such program;

     NOW, THEREFORE, the parties named above agree as follows:

     1. The Policy. The Owner will contemporaneously purchase with the execution
of this Agreement a policy of insurance (the "Policy") on the life of the
Employee (the "Insured"), issued by the Metropolitan Life Insurance Company (the
"Insurer"). The parties to this Agreement shall take all necessary actions to
cause the Policy to conform to the provisions of this Agreement. The parties to
this Agreement also agree that the Policy shall be subject to the terms and
conditions of this Agreement and the collateral assignment referred to in
Section 2 of this Agreement.

     2. Collateral Assignment. Concurrently with the execution of this
Agreement, the Owner and the Corporation shall execute a "Limited Collateral
Assignment of Split-Dollar Life Insurance Policy" (the "Assignment") as security
for the repayment of the Corporation's Premium Payments (as defined in Section
10 of this Agreement). No provisions of this Agreement shall be inconsistent
with the rights of the parties under the Assignment, and the parties to this
Agreement agree to take all actions necessary to cause this Agreement to conform
to the provisions of such Assignment.

     3. Ownership of Policy. Except as otherwise provided in this Agreement and
the Assignment:
<PAGE>
 
     (a) The Owner shall retain and may exercise all incidents and rights of
ownership with respect to the Policy.

     (b) The Corporation shall not have any right to borrow against the cash
surrender value of the Policy to any extent, and the Corporation shall not
possess any "incidents of ownership" in the Policy as that term is defined in
Section 2042 of the Internal Revenue Code of 1986, as amended, and the Treasury
Regulations thereunder as they may from time to time be amended or supplemented.
The Corporation shall have no right to take any action that would cause the
Policy to lapse or terminate. 

     (c) Subject to the limitations set forth elsewhere in this Agreement and
except as otherwise provided in this Agreement, the sole right of the
Corporation under this Agreement shall be the right to be repaid its Premium
Payments (as defined in Section 10 of this Agreement). Except as otherwise
provided in this Agreement, the Corporation shall neither have nor exercise any
right which could in any way defeat or impair the Owner's right to receive the
cash surrender value or the death proceeds of the Policy in excess of the
Corporation's Premium Payments (as defined in Section 10 of this Agreement).

     4. Limitations on Owner's Rights in the Policy. Except as otherwise
provided in this Agreement and the Assignment:

     (a) The Owner shall take no action with respect to the Policy which would
in any way compromise or jeopardize the Corporation's right to be repaid its
Premium Payments (as defined in Section 10 of this Agreement). The Owner shall
have no right to borrow against the cash surrender value of the Policy prior to
the date the Insured attains age sixty-five (65) and any such borrowing shall be
limited to that portion of the cash surrender value of the Policy which is not
subject to the Assignment.

     (b) The Owner shall have the sole right to surrender or cancel the Policy
and receive the full cash surrender value of the Policy directly from the
Insurer, provided, however, that (i) this Agreement and the Assignment shall
terminate upon any such surrender or cancellation of the Policy after the
Insured's attainment of age sixty-five (65) and the Corporation shall have no
further obligations with respect to the Policy, and (ii) upon any such surrender
or cancellation of the Policy prior to the Insured's attainment of age
sixty-five (65), the Corporation shall have the unqualified right to receive
from the Owner the entire cash surrender value of the Policy and this Agreement
and the Assignment shall terminate immediately and the Corporation shall have no
further obligations with respect to the Policy. Immediately upon receipt of the
cash surrender value of the Policy from the Insurer in the event of such a
surrender or cancellation of the Policy prior to the Insured's attainment of age
sixty-five (65), the Owner shall pay to the Corporation such cash surrender
value to which it is entitled. The Insurer may be directed in writing by the
Owner to draw a check payable to the Corporation in an amount equal to such cash
surrender value.
<PAGE>
 
     (c) The Owner shall have the right to partially surrender the Policy after
the Insured has attained age sixty-five (65) and prior to the termination of
this Agreement provided, however, that any such partial surrender shall be made
no more frequently than once during any twelve month period and the amount of
cash surrender value under the Policy immediately after such partial surrender
shall not be less than fifty-percent (50%) of the Policy's cash surrender value
immediately prior to such partial surrender.

     (d) The Corporation shall have the sole right under the Policy to provide
investment instructions to the Insurer with respect to the Policy prior to the
Insured's attainment of age sixty-five (65). The Owner shall have the sole right
under the Policy to provide investment instructions to the Insurer with respect
to the Policy on or after the date the Insured attains age sixty-five (65).

     5.  Safeguarding the Policy. The Corporation shall be responsible for
holding and safeguarding the Policy.

     6.  Change of Beneficiary. The Owner shall execute and forward promptly to
the Insurer such change in beneficiary designation forms and supporting
documents, as may from time to time be required by the Insurer, to facilitate
the exercise of any rights of the parties hereto, and the Corporation shall
forward any supporting documents required by the Insurer to complete the change
of Beneficiary; provided, however, that the Owner and the Corporation shall not
be required to execute any documents or take any action that would impair their
respective interests under the Policy.

     7.  Policy Dividends. Any dividend declared on the Policy shall be applied
to purchase paid-up additional insurance on the life of the Insured. The parties
hereto agree that the dividend election provisions of the Policy shall conform
to the provisions of this Section 7.

     8.  Schedule of Policy Benefits. The total death benefit of the Policy in
effect prior to the termination of this Agreement and the Assignment shall be
the sum of (a) the aggregate of all premium payments and other amounts paid by
the Corporation to the Insurer with respect to the Policy prior to the date the
Insured attained age sixty-five (65) (less any such amounts paid by the Owner
pursuant to Section 9 of this Agreement), and (b) the "Benefit Amount"
determined in accordance with the Schedule of Insurance attached hereto as
Attachment A.

     9.  Payment of Premiums. The Owner shall pay a monthly premium equal to
fifteen cents ($0.15) per $1,000 of the Policy's face amount in effect for such
month which is attributable to the "Benefit Amount" described in paragraph (b)
of Section 8. The Owner's obligation to pay such monthly premium shall terminate
effective with the first month immediately following the month in which the
Insured attains 
<PAGE>
 
age sixty-five (65). Either the Owner or Employee, on behalf of the Owner, shall
pay such required premium to the Corporation prior to the premium due date or
such other date as may be specified by the Corporation. The Corporation shall
pay the balance of the annual premium required to maintain the Policy in full
force and effect until the date or dates this Agreement terminates pursuant to
Sections 11 or 12, plus any additional premium the Corporation may decide, in
its sole discretion, to pay to the Policy. The Corporation shall remit to
Insurer each premium due in accordance with the mode of premium payment as
provided in the Policy on or before the applicable due date and within any grace
period allowed by the Policy. The Corporation shall annually furnish to the
Employee a statement of the amount of income reportable by the Employee for
federal and state income tax purposes, if any, as a result of its payment of any
portion of the premium and the resulting insurance protection provided to the
Policy's beneficiaries.

     10. Repayment of the Corporation. Subject to the limitations set forth
elsewhere in this Agreement, the Corporation's "Premium Payments" shall
constitute an obligation of the Owner to the Corporation. The Corporation's
Premium Payments shall be determined as follows:

     (a) In the event the Insured dies prior to the termination of this
Agreement, the Corporation's Premium Payments shall be the aggregate of all
premiums and other amounts paid to the Insurer by the Corporation with respect
to the Policy prior to the date the Insured attained age sixty-five (65) (less
any amounts paid by the Owner pursuant to Section 9 of this Agreement).

     (b) In the event this Agreement is terminated during the Insured's lifetime
in accordance with Section 12 and the Insured has not attained age sixty-five
(65) at the time of such termination, the Corporation's Premium Payment shall be
the entire cash surrender value of the Policy.

     If the Policy at any time contains a disability waiver of premium provision
or waiver of monthly deduction, any waived amounts shall be considered for all
purposes of this Agreement as having been paid by the Owner.

     11. Death Proceeds. Upon the death of the Insured, the Corporation and the
Owner shall cooperate to take whatever action is necessary to collect the death
benefit provided under the Policy; when such benefit has been collected and paid
as provided herein, this Agreement shall thereupon terminate.

     Upon the death of the Insured, the Corporation shall have the unqualified
right to receive a portion of such death benefit equal to its outstanding
Premium Payments. The balance of the death benefit provided under the Policy, if
any, shall be paid directly to the other beneficiary or beneficiaries of the
Policy as designated by the Owner, in the manner and in the amount or amounts
provided in the beneficiary designation provision of the Policy. No amount shall
be paid from such death benefit to any beneficiary 
<PAGE>
 
until the full amount due the Corporation hereunder has been paid. The parties
hereto agree that the beneficiary designation provision of the Policy shall
conform to the provisions hereof.

        Any interest due on the death benefit under the terms of the Policy
shall be divided between the Corporation and the beneficiary or beneficiaries
designated by the Owner in the same proportions as their respective shares of
the death benefit (as determined under this Section 11) bears to the total death
benefit, excluding such interest. Any refund of unearned premiums on the death
of the Insured under the Policy provisions shall belong to the beneficiary or
beneficiaries designated by the Owner.

        Notwithstanding any provision of this Agreement to the contrary, in the
event no death benefit is payable under the Policy upon the death of the Insured
and in lieu thereof the Insurer refunds all or any part of the premiums paid for
the Policy, the Corporation and the Owner shall have the unqualified right to
share such premiums based on their respective cumulative contributions thereto.

        12. Termination of the Agreement During the Insured's Lifetime. This
Agreement shall terminate during the Insured's lifetime, without notice, upon
the occurrence of any of the following events: (a) the total cessation of the
Corporation's business, (b) bankruptcy, receivership, or dissolution of the
Corporation, (c) the date the Insured voluntarily terminates employment with the
Corporation or any of its affiliates prior to the date the Insured attains age
fifty-five (55) and completes ten (10) years of vesting service as determined
under the provisions of the Retirement Plan of Mobil Oil Corporation (or any
successor plan), (d) the date the Insured is terminated "for cause" attributable
to gross, willful or intentional misconduct which the Corporation determines, in
its sole discretion, to be harmful to the Corporation or any of its affiliates,
(e) the date the Corporation is repaid its total Premium Payments (as defined in
Section 10), (f) failure of the Owner to timely pay to the Corporation the
Owner's portion of the premium, if any, due hereunder, (g) the complete
surrender or cancellation of the Policy by the Owner, or (h) a partial surrender
of the Policy by the Owner after the Insured has attained age sixty-five (65)
that exceeds the limitations on such partial surrenders described in paragraph
(c) of Section 4. Upon any such termination of the Agreement prior to the
Insured's attainment of age sixty-five (65), the Owner shall, within 30 days of
the date of such termination, repay to the Corporation its outstanding Premium
Payments.

            Notwithstanding the forgoing and subject to Section 16, the Owner or
Corporation may terminate this Agreement, while no premium under this Policy is
overdue, by providing written notice to the other parties hereto. Such
termination shall be effective as of the date of such notice.

        13. Additional Payments to Policy By Corporation After Insured Attains
Age Sixty-five (65). In the event the Insured has attained age sixty-five (65)
and this Agreement has not been terminated pursuant to Section 12, the
Corporation shall make additional payments to the Policy. These additional
<PAGE>
 
payments shall be made in substantially equal annual installments over ____
years and the first such annual payment shall commence no later than the last
day of the month following the month the Insured attains age sixty-five (65).

     The total amount of the additional payments described in this Section 13 by
the Corporation shall be the amount necessary to fully fund the Policy for the
remainder of the Insured's lifetime based on such assumptions as may be deemed
appropriate from time to time by the Corporation.

     14. Release of Collateral Assignment During the Insured's Lifetime. In the
event this Agreement terminates during the lifetime of the Insured pursuant to
Section 12, the Corporation shall totally and completely release its Assignment
of the Policy by executing and delivering to the Insurer an appropriate
instrument of release immediately upon the receipt of the Corporation's Premium
Payments, if any, from the Owner and the Corporation shall have no further
rights or obligations with respect to the Policy.

     If this Agreement has not terminated prior to the date the Insured attains
age sixty-five (65), the Corporation shall release its Assignment with respect
to the cash surrender value of the Policy on such date (including any amounts
subsequently credited under the Policy by the Insurer which are attributable to
such released cash surrender value).

     The Corporation shall totally and completely release its Assignment of the
Policy on the date the last additional payment described in Section 13 is made
to the Policy and this Agreement and the Assignment shall completely terminate
and the Corporation shall have no further obligations or rights with respect to
this Policy.

     The Corporation shall release its Assignment under this Section 14 by
executing and delivering to the Insurer an appropriate instrument of release.


     15. Named Fiduciary, Claims Procedure, and Administration

     (a) Designation of Named Fiduciary. The Corporation is hereby designated as
         ------------------------------
the named fiduciary under this Agreement. Subject to the procedures set out in
paragraph (b) through (e) of this Section, the named fiduciary shall have the
authority to control and manage the operation and administration of this
Agreement, and it shall be responsible for establishing and carrying out a
funding policy and method consistent with the objectives of this Agreement.
<PAGE>
 
     (b) Claim. If the Owner or any beneficiary believes that any person is
         -----
being denied a benefit to which such person is entitled under this Agreement,
such person (hereinafter referred to as a "Claimant") may file a written request
for such benefit with the Corporation, setting forth his or her claim. The
request must be addressed to the Vice-President, Human Resources of the
Corporation at its then principal place of business.

     (c) Claim Decision. Upon receipt of a claim, the Corporation shall advise
         --------------
the Claimant that a reply will be forthcoming within thirty (30) days and shall
deliver such reply within such period. The Corporation may, however, extend the
reply period for an additional thirty (30) days for reasonable cause. If the
claim is denied in whole or in part, the Corporation shall adopt a written
opinion, using language calculated to be understood by the Claimant, setting
forth:

         (i)   The specific reason or reasons for such denial;
             
         (ii)  The specific reference to pertinent provisions of this Agreement
               and/or the Assignment on which such denial is based;

         (iii) A description of any additional material or information
               necessary for the Claimant to perfect his or her claim and an
               explanation why such material or such information is necessary;

         (iv)  Appropriate information as to the steps to be taken if the
               Claimant wishes to submit the claim for review; and

         (v)   The time limits for requesting a review under Paragraph (d) of
               this Section and for review under Paragraph (e) of this Section.

     (d) Request for Review. Within sixty (60) days after the receipt by the
         ------------------
Claimant of the written opinion described in Paragraph (c) of this Section, the
Claimant may request in writing that the Vice-President, Human Resources of the
Corporation review the determination of the Corporation. Such request must be
addressed to the Vice-President, Human Resources of the Corporation, at its then
principal place of business. The Claimant or his or her duly authorized
representative may, but need not, review the pertinent documents and submit
issues and comments in writing for consideration by the Corporation. If the
Claimant does not request a review of the Corporation's determination by the
Vice-President, Human Resources, of the Corporation within such sixty (60) day
period, he shall be barred and estopped from challenging the Corporation's
determination.

     (e) Review of Decision. Within thirty (30) days after the Vice-President,
         ------------------
Human Resources' receipt of a request for review under Paragraph (d) of this
Section, he will review the Corporation's determination. After considering all
materials presented by the Claimant, the Vice-President, Human Resources will
render a written opinion, written in a manner calculated to be understood by the
Claimant, 
<PAGE>
 
setting forth the specific reasons for the decision and containing specific
references to the pertinent provisions of this Agreement on which the decision
is based. If special circumstances require that the thirty (30) day time period
be extended, the Vice-President, Human Resources will so notify the Claimant and
will render the decision as soon as possible, but not later than sixty (60) days
after receipt of the request for review.

     16. Amendment of Agreement. This Agreement may be altered, amended, or
modified, including the addition of any extra Policy provisions, only by a
written agreement signed by the parties hereto, or their successors or assigns.
This Agreement may be terminated at any time in accordance with the provisions
of Section 12, provided, however, that the Corporation may not terminate this
Agreement after the Insured has attained age sixty-five (65).

     17. Controlling Law. The laws of the Commonwealth of Virginia shall govern
this Agreement.

     18. Liability of Insurer. The Insurer is not a party to this Agreement.
With respect to any policy of insurance held in accordance with this Agreement,
the Insurer shall have no liability except as set forth in the Policy. The
Insurer shall not be bound to inquire into to or take notice of any of the
covenants herein contained as to policies of life insurance or as to the
application of the proceeds of such policies. No provision of this Agreement,
nor of any modification or amendment hereof, shall in any way be construed as
enlarging, changing, varying, or in any other way affecting the obligations of
the Insurer as expressly provided in the Policy, except insofar as this
Agreement or any modification or amendment hereto are made a part of the Policy
by the Assignment and which is filed with the Insurer. The Insurer shall be
fully discharged from its obligations under the Policy by payment of the Policy
death benefits to the beneficiary or beneficiaries named in the Policy, subject
to the terms and conditions of the Policy.

     19. Binding Agreement. This Agreement sets forth the entire agreement
between the parties concerning the subject matter thereof, and it shall bind all
parties, their representatives, successors, and assigns (including, in the case
of the Corporation, any successor or assignees by merger, consolidation,
purchase or otherwise) and any Policy beneficiary.

     20. Notice. Any notice, consent, or demand required or permitted to be
given under the provisions of this Agreement shall be in writing, and any such
notice shall be signed by the party giving or making such notice. If such
notice, consent, or demand is mailed to a party hereto, it shall be sent by
United States certified mail, postage prepaid, addressed to such party's last
known address as shown on the records of the Corporation. The date of such
mailing shall be deemed to be the date of notice, consent or demand.
<PAGE>
 
     21. Right of Discharge Reserved. Nothing contained in this Agreement or the
Assignment shall be construed to be a contract of employment for any term of
years, nor as conferring upon the Insured any legal right to be retained in the
employ of the Corporation or any affiliate, or to give any Employee, or to the
spouse, beneficiary or estate of any such Employee, or to any other person, any
right or share in the Policy except as expressly provided in this Agreement or
Assignment. The Insured shall remain subject to discharge and change in
employment duties to the same extent as if this Agreement had never been entered
into and may be treated without regard to the effect such treatment may have on
such Insured (or the Owner or any beneficiary under the Policy).

     22. Taxes. The Corporation does not warrant or guarantee and assumes no
obligation or responsibility with respect to the federal, state or local income,
estate, inheritance, gift or other tax obligations of the Insured or Owner as a
result of this Agreement or the Assignment. Any tax required to be withheld in
connection with this Agreement, as determined by the Corporation, shall be
deducted from any amounts payable by the Corporation to the Insured or from any
amounts payable pursuant to this Agreement.

     23. Headings. All Section and Paragraph headings contained in this
Agreement are intended for convenience and reference purposes only and are not
entitled to, nor should they be accorded, substantive effect.
<PAGE>
 
IN WITNESS WHEREOF, the parties have executed this Agreement the date first
herein above written.

                                       CORPORATION:

                                       Mobil Oil Corporation



Attest:                                By:  
                                            -------------------------------

By:                                    Title: 
    ------------------------                  -----------------------------
        Secretary



                                       INSURED:


- ----------------------------           ------------------------------------
Unofficial Witness



                                       OWNER:


- ----------------------------           ------------------------------------
Unofficial Witness
<PAGE>
 
                                  Attachment A

                             SCHEDULE OF INSURANCE
                             ---------------------

- --------------------------------------------------------------------------------
Attained Age as of January 1*                  Benefit Amount for Calendar Year 
- --------------------------------------------------------------------------------
     Age 50 or younger                                    4.00 x pay
          Age 51                                          3.80 x pay
          Age 52                                          3.60 x pay
          Age 53                                          3.40 x pay
          Age 54                                          3.20 x pay
          Age 55                                          3.00 x pay
          Age 56                                          2.80 x pay
          Age 57                                          2.60 x pay
          Age 58                                          2.40 x pay
          Age 59                                          2.20 x pay
     Age 60 or older                                      2.00 x pay

     "Pay" shall mean, for any calendar year following the calendar year in
which this Agreement becomes effective, the sum of (a) the Insured's annual rate
of base pay in effect as of January 1 of such calendar year, (b) the target
short-term incentive award under the 1995 Mobil Incentive Compensation and Stock
Ownership Plan (or any successor plan) for the Insured's Salary Group for the
calendar year, and (c) the lump sum individual pay adjustment, if any, awarded
to the Insured in the immediately preceding calendar year; provided, however,
that for the calendar year in which this Agreement is first effective, "pay"
shall mean the sum of (x) the Insured's annual rate of base pay in effect on the
date this Agreement becomes effective, (y) the target short-term incentive award
under the 1995 Mobil Incentive Compensation and Stock Ownership Plan (or any
successor plan) for the Insured's Salary Group for such calendar year, and (z)
the lump sum individual pay adjustment, if any, awarded to the Insured in such
calendar year or, if the Agreement is effective prior to the date such lump sum
individual pay adjustment is awarded for such calendar year, the lump sum
individual pay adjustment, if any, awarded to the Insured in the immediately
preceding calendar year.

     Notwithstanding the "Benefit Amount" specified in the above schedule, the
Insured's "Benefit Amount" for any year shall be subject to, and limited by,
such terms and conditions, including underwriting requirements, as the Insurer
may require from time to time.


- -----------------------------
* The Insured's age for the first calendar year this Agreement is effective
shall be the Insured's attained age on the date this Agreement is effective.
<PAGE>
 
                                                                       EXHIBIT B


                        LIMITED COLLATERAL ASSIGNMENT OF
                             LIFE INSURANCE POLICY
                       BETWEEN __________________________
                           AND MOBIL OIL CORPORATION


         METROPOLITAN LIFE INSURANCE COMPANY POLICY NO. ______________


     This agreement, hereinafter referred to as the "Assignment," is made, this
___ day of ______________ , 1998, effective as of ______________ , 1998, by and
between __________________ _____________________________ (the "Owner"), and
Mobil Oil Corporation, a New York corporation (the "Corporation"), its
successors and assigns.

     1. The Policy. The subject of this Assignment is a certain life insurance
        ----------
     policy, Policy No. _______ a copy of which is attached as Exhibit "A",
     issued by Metropolitan Life Insurance Company (the "Insurer"), and any
     increased, substituted, supplemental, or additional insurance as may from
     time to time be issued in respect of such policy (said policy and any such
     additional insurance hereinafter referred to as the "Policy"), insuring the
     life of the Owner who currently resides in ______________________________.
                                               

     2. The Executive Life Insurance Agreement. The Policy is subject to the
        --------------------------------------
     "Executive Life Insurance Agreement" (the "Agreement"), dated ___________,
     1998 by and between the Corporation and the Owner. The Agreement was
     entered into to assist the Owner with obtaining personal life insurance
     protection. Such Agreement is hereby incorporated into and made a part of
     this Assignment, and no provision of the Agreement shall be construed to be
     inconsistent with any provision of this Assignment.

     3. The Assignment. This Assignment is made, and the Policy is held, as
        --------------
     collateral security for the repayment of the Corporation's Premium Payments
     (as defined under Section 10 of the Agreement) with respect to the Policy.
     Nothing in this Assignment or in the Agreement shall be construed as an
     assignment to the Corporation of any rights in the Policy other than those
     specifically enumerated in such Assignment or Agreement. The Owner hereby
     assigns, transfers, and sets over to the Corporation the following
     specific, limited rights in the Policy, and the Corporation's rights in the
     Policy shall be limited to these specific, limited rights and such other
     rights as may be specifically set forth in this Assignment or the
     Agreement:
<PAGE>
 
          (a) The right to recover from the net death proceeds of the Policy
     upon the death of the Owner the aggregate of all premiums and other amounts
     paid to the Insurer by the Corporation with respect to the Policy prior to
     the date the Owner attained age sixty-five (65);
    
          (b) The right to recover from the Policy the entire cash surrender
     value of the Policy in the event the Agreement is terminated prior to the
     date the Owner attains age sixty-five (65); and
   
          (c) The right to provide investment instructions to the Insurer with
     respect to the Policy prior to the date the Owner attains age sixty-five
     (65).

4.   Release of Assignment.
     ---------------------

          (a) The Assignment shall terminate completely on the date the
     Corporation is paid its Premium Payments in accordance with the Agreement
     on account of the death of the Owner prior to termination of the Agreement
     or the termination of the Agreement prior to the date the Owner attained
     age sixty-five (65).
    
          (b) The Assignment shall also terminate with respect to the Policy's
     cash surrender value on the date the Owner attains age sixty-five (65)
     (including any amounts subsequently credited under the Policy by the
     Insurer which are attributable to such released cash surrender value),
     provided, however, that the Assignment shall not be completely released
     with respect to the Policy until such date as may be provided in this
     Section 4.

          (c) The Assignment shall terminate completely with respect to the
     Policy immediately following the date the last such additional annual
     payment is made to the Policy by the Corporation in accordance with Section
     13 of the Agreement and the Corporation shall have no further obligations
     or rights with respect to the Policy.

          (d) The Corporation shall release its Assignment under this Section 4
     by executing and delivering to the Insurer an appropriate instrument of
     release.

5.   Limitation on the Corporation's Rights and Obligations.
     ------------------------------------------------------

          (a) The Corporation shall not have any right to borrow against the
     cash surrender value of the Policy to any extent, and it shall have no
     right or power to obtain loans or advances on the Policy or cancel or
     surrender the Policy. Notwithstanding any provision of this Assignment or
     of the Agreement, the Corporation does not possess, and by this Assignment
     and by the terms of the Agreement shall not be deemed to have 
<PAGE>
 
     acquired, any "incidents of ownership" in the Policy as that term is
     defined in Section 2042 of the Internal Revenue Code of 1986, as amended,
     and the Treasury Regulations issued thereunder, as they may be from time to
     time amended or supplemented. The Corporation is strictly prohibited from
     surrendering the Policy for cancellation, assigning its rights to any
     person other than to the Owner or to some other person as the Owner may
     direct or to an assignee of options or rights of the Owner under the
     Agreement pursuant such assignee's exercise thereof, or taking any action
     which would endanger the payment of the Policy proceeds in excess of its
     Premium Payments (as defined in Section 10 of the Agreement). 

          (b) The Corporation shall not have, and by this Assignment or by the
     terms of the Agreement shall not be deemed to have acquired, any obligation
     to pay any premium due from time to time on the Policy, the principal of or
     interest on any loans or advances on the Policy, or any other charges on
     the Policy.

6.   Retention of Ownership by Owner.
     -------------------------------

          (a) Except as specifically provided in this Assignment and in the
     Agreement, the Owner shall retain and possess all other incidents of
     ownership in the Policy not explicitly assigned under the previous
     provisions of this Assignment to the Corporation, including, but not
     limited to:

               (i)   The sole and exclusive right to cancel or surrender the
               Policy for its cash surrender value, if any;

               (ii)  The right to designate and change the beneficiary of the
               death proceeds on the Policy (other than designation of the
               Corporation as a beneficiary with respect to its recovery of its
               Premium Payments as described in Section 10 of the Agreement);

               (iii) The right to elect and exercise any optional mode of
               settlement permitted by the Policy;

               (iv)  The right to borrow against the cash value of the Policy or
               to obtain loans or advances on the Policy after the Owner has
               attained age sixty-five (65);

               (v)   The sole right to exercise all non-forfeiture rights
               permitted by the terms of the Policy or allowed by the Insurer
               and to receive all benefits and advantages derived therefrom;

               (vi)  The sole right to assign the Policy; and
<PAGE>
 
               (vii) The right to collect from the Insurer that portion of the
               net proceeds of the Policy when it becomes a claim by death or
               maturity when proceeds are not payable to the Corporation under
               the Agreement.

          (b)  Notwithstanding the preceding provisions of paragraph (a), all
     rights retained by the Owner shall be subject to the terms and conditions
     of the Agreement, and no action by the Owner shall reduce or interfere with
     the rights of the Corporation under this Assignment or under the Agreement.

7. Repayment Events. The Corporation shall have the right to be repaid to the
   ----------------
extent of its Premium Payments (as defined in Section 10 of the Agreement) upon
the death of the Owner prior to the termination of the Agreement or upon the
happening of any of the following events (the "Repayment Events") which occur
prior to the Owner's attainment of age sixty-five (65):

          (a)  The lapse, cancellation, or surrender of the Policy by the Owner
     or its assignee;
  
          (b)  The total cessation of the Corporation's business;

          (c)  Bankruptcy, receivership, or dissolution of the Corporation;

          (d)  The Owner's voluntary termination of employment with the
     Corporation or any of its affiliates prior to attainment of age fifty-five
     (55) and completion of ten (10) years of vesting service as determined
     under the provisions of the Retirement Plan of Mobil Oil Corporation (or
     any successor plan);

          (e)  Termination of the Owner's employment with the Corporation "for
     cause" attributable to gross, willful or intentional misconduct which the
     Corporation determines, in its sole discretion, to be harmful to the
     Corporation or any of its affiliates; or

          (f)  The failure of the Owner to timely pay to the Corporation the
     Owner's portion of the premium, if any, due hereunder.

8.   Satisfaction of the Corporation.
     -------------------------------

          (a)  The Corporation agrees that upon the death of the Owner prior to
     termination of the Agreement or upon the happening of a Repayment Event (as
     described in Section 7 of this Assignment), the balance of any sums
     received from the Insurer after satisfaction of the Corporation's Premium
     Payments (as defined in Section 10 of the Agreement) shall belong to the
     Owner or any assignee if the Owner is then living, or, upon the death of
     the Owner, to the beneficiary designated by the Owner under the Policy. 
<PAGE>
 
          (b) Notwithstanding any provisions of this Assignment or of the
     Agreement to the contrary, upon the termination of the Agreement and the
     repayment to the Corporation of its Premium Payments (as defined in Section
     10 of the Agreement), if any, the Corporation shall be obligated to release
     all its specific rights in the Policy transferred by this Assignment, or
     make a reassignment of such interest to the Owner or to the Owner's
     successors or assigns, without unreasonable delay. The Corporation shall
     have no further rights or obligations with respect to the Policy (or that
     portion of the Policy subject to any such Assignment) upon such release or
     reassignment.

9.   Insurer Provisions.
     ------------------

          (a) The Insurer is not a party to this Assignment or to the Agreement.
     
          (b) The Insurer shall have no duty or obligation to inquire into or
     investigate the reason, validity, or accuracy of the Corporation's request
     to exercise any of its rights granted to it under Section 3 of this
     Assignment, or whether the Owner has notice of any such exercise. The
     Insurer may treat any such request by the Corporation as an affirmation
     that the request conforms to and is not inconsistent with the provisions of
     this Assignment and with the Agreement, and it is thereby authorized to act
     upon such requests.

          (c) The Insurer shall be under no obligation to monitor the obligation
     of the Corporation to pay amounts received from the Insurer, if any, in
     excess of the Corporation's Premium Payments (as defined in Section 10 of
     the Agreement). Likewise, the Insurer shall be under no obligation to
     monitor the obligation of the Owner, or the other beneficiary or
     beneficiaries designated by the Owner, to pay to the Corporation from any
     amounts received from the Insurer its Premium Payments (as defined in
     Section 10 of the Agreement). The Insurer shall have no obligation or
     liability to any person or entity if the Corporation or the Owner (or the
     other beneficiary or beneficiaries designated by the Owner) fail to pay
     such amounts as are required under this Assignment.

          (d) The Insurer shall be fully protected in recognizing a request by
     the Owner to exercise any right of ownership retained (including, but not
     limited to, the rights retained under Section 6 of this Assignment),
     explicitly or otherwise, by the Owner under this Assignment or under the
     Agreement, whether or not the Corporation has notice of such request (other
     than a change of beneficiary designation form which purports to alter the
     Corporation's designation as a beneficiary with respect to its recovery of
     its Premium Payments which requires the written consent of the
     Vice-President, Human Resources of the Corporation).
<PAGE>
 
          10. Effective Date. This Assignment shall be effective on the later of
              --------------
     (a) the date of execution of this Assignment or (b) the date of issuance of
     the Policy.

          11. Headings. All Section headings contained in this instrument are
              --------
     intended only for convenience and reference purposes, and they are not
     entitled to, nor should they be accorded, substantive effect.
<PAGE>
 
IN WITNESS WHEREOF, this Assignment is hereby executed the day and year first
above written.


                                           OWNER:


- ----------------------------               -----------------------------
Unofficial Witness                         (Name)







                                           CORPORATION:

                                           Mobil Oil Corporation


                                           By:     
                                              ---------------------------


Attest:


By:                                        Title:
   -------------------------                     ------------------------
         Secretary

<PAGE>
 
- --------------------------------------------------------------------------------
                                  Exhibit 10.5
- --------------------------------------------------------------------------------

                                Table of Contents
                                -----------------

PART I - GENERAL PROVISIONS                                                Page
                                                                           ----

Article I - Purpose ......................................................   2
Article II - Definitions .................................................   2
Article III - Eligibility ................................................   6
Article IV - Method of Payment of Benefits ...............................   6
Article V - Designation of Beneficiaries .................................   9
Article VI - Authorities .................................................  10
Article VII - Rights of Participants .....................................  12
Article VIII - Administration of the Program .............................  12
Article IX - Non-Duplication of Benefits .................................  13
Article X - Participating Affiliates .....................................  14

PART II - SUPPLEMENTAL RETIREMENT BENEFIT PLAN OF MOBIL OIL CORPORATION

Article I - Purpose ......................................................  15
Article II - Eligibility .................................................  15
Article III - Amount of Benefits .........................................  15

PART III - SUPPLEMENTAL SAVINGS BENEFIT PLAN OF MOBIL OIL CORPORATION

Article I - Purpose ......................................................  18
Article II - Eligibility .................................................  18
Article III - Amount of Benefits .........................................  18

PART IV - RETIREMENT BENEFIT ENHANCEMENT PLAN OF MOBIL OIL CORPORATION

Article I - Purpose ......................................................  22
Article II - Eligibility .................................................  22
Article III - Amount of Benefits .........................................  22

PART V - RETIREMENT BENEFIT EQUALIZATION PLAN OF MOBIL OIL CORPORATION

Article I - Purpose ......................................................  24
Article II - Eligibility .................................................  24
Article III - Amount of Benefits .........................................  24
<PAGE>
 
                                     PART I

                               GENERAL PROVISIONS


                               Article I - Purpose
                               -------------------

1.1  The purpose of this Program is to provide for the payment of benefits to
     certain participants in the Retirement Plan of Mobil Oil Corporation and
     the Employees Savings Plan of Mobil Oil Corporation.

1.2  This Program is comprised of multiple Parts, Part I - General Provisions,
     Part II - the Supplemental Retirement Benefit Plan, Part III - the
     Supplemental Savings Benefit Plan, Part IV - the Retirement Benefit
     Enhancement Plan, and Part V - the Retirement Benefit Equalization Plan. As
     set forth herein, the Program constitutes an amendment and restatement as
     of January 1, 1998, of the Supplemental Benefit Plan established by Mobil
     Oil Corporation effective January 1, 1976 and amended and restated from
     time to time.

1.3  Eligibility for benefits and the amount of such benefits under this Program
     and each of its Parts shall be determined by Mobil Oil Corporation in
     accordance with the provisions of each of its separate Parts.

1.4  This Program and each of its Parts is intended to constitute an unfunded
     "excess benefit plan" (as defined in Section 3(36) of ERISA). To the extent
     that any benefit for any Participant does not qualify for such status, this
     Program and each of its Parts is intended to constitute an unfunded plan
     maintained by Mobil Oil Corporation primarily for the purpose of providing
     deferred compensation for a select group of management or highly
     compensated employees (as defined in Sections 201(2), 301(a)(3), and
     401(a)(1) of ERISA).


                            Article II - Definitions
                            ------------------------

When used in this Program or any of its Parts, the following defined terms shall
have the following meanings:

2.1  "Affiliated Company" shall mean any corporation described in Article II (a)
     of the Retirement Plan or Section 1.3 of the Savings Plan.

                                       2
<PAGE>
 
2.2  "Base Pay" shall mean Base Pay as defined in the Savings Plan as in effect
     from time to time, but excluding the amounts of any short-term incentive
     awards under the Incentive Plan.

2.3  "Beneficiary" shall mean the beneficiary or beneficiaries designated by a
     Participant in accordance with Article V of Part I herein to receive the
     benefits, if any, payable under any Part of this Program upon such
     Participant's death.

2.4  "Change in Control" shall mean a Change in Control as defined in the Mobil
     Corporation Employee Severance Plan.

2.5  "Code" shall mean the Internal Revenue Code of 1986, as amended from time
     to time.

2.6  "Current Benefit" shall mean the benefit determined under the Retirement
     Plan's benefit formula, including any applicable Limitation on Benefits or
     Limitation on Compensation, which a person would be eligible to receive if
     he or she were to terminate employment on a specified date and elect to
     receive a benefit at the earliest date permitted under the provisions of
     the Retirement Plan.

2.7  "Company" shall mean Mobil Oil Corporation.

2.8  "Director or Officer" shall mean a director or officer of Mobil
     Corporation, as defined in Rule 16a-l(f) under the Securities Exchange Act
     of 1934.

2.9  "Eligible Above Base Pay" shall mean, for purposes of determining the
     Supplemental Savings Benefit for any Participant, any short term incentive
     award (whether paid or deferred) under the Incentive Plan; provided that
     the amount of any such award included as Eligible Above Base Pay shall not
     exceed 50% of the Participant's Base Pay.

2.10 "Eligibility Threshold Amount" shall mean $450,000 as adjusted from time to
     time by the Company to reflect changes in the Consumer Price Index for
     Urban Wage Earners and Clerical Workers for the period commencing June 30,
     1985.

2.11 "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
     amended from time to time.

2.12 "ESOP" shall mean the Leveraged Employee Stock Ownership Plan established
     under the Savings Plan.

2.13 "Executive Committee" shall mean the Executive Committee of the Board of
     Directors of the Company.

                                       3
<PAGE>
 
2.14 "Incentive Plan" shall mean the 1995 Mobil Incentive Compensation and Stock
     Ownership Plan and any predecessor or successor plan.

2.15 "Limitation on Benefits" shall mean the limitation on the "annual benefit"
     payable to Participants under the Retirement Plan in accordance with
     Section 415 of the Code.

2.16 "Limitation on Compensation" shall mean the limitation on the annual
     compensation of each Participant resulting from the exclusion from benefit
     calculations under the Retirement Plan and the Savings Plan of (i)
     compensation deferred pursuant to the Incentive Plan; and (ii) compensation
     in excess of the amount that can be included pursuant to Section 401(a)(17)
     of the Code.

2.17 "Limitation on Contributions" shall mean the limitation on the aggregate
     amount of "annual additions" which can be made to Participants' accounts
     under the Savings Plan in accordance with Section 415 of the Code.

2.18 "LTFI units" shall mean notional units of the Long-Term Fixed Income option
     under the Savings Plan.

2.19 "Participant" shall mean a person who is eligible to participate in any or
     all of the Plans set forth in Parts II, III, IV, or V in the manner
     described therein.

2.20 "Participating Affiliate" shall mean any Affiliated Company which meets the
     requirements set forth in Section 10.1(a) of this Part I.

2.21 "Participating Employee" shall have the meaning as set forth in Article
     II(q) of the Retirement Plan.

2.22 "Potential Retirement Benefit" shall mean a hypothetical benefit calculated
     according to the Retirement Plan but without taking into account (as
     otherwise required under the Retirement Plan) any applicable Limitation on
     Benefits or Limitation on Compensation.

2.23 "Predecessor Plan Participant" shall mean a person who terminated
     employment with the Company on a date prior to January 1, 1998, and with
     respect to whom a benefit is payable under the provisions of the
     Supplemental Benefit Plan in effect on the date his or her employment was
     terminated.

2.24 "Prorated Benefit" shall mean that portion of the Participant's life
     annuity determined pursuant to the Retirement Plan which is equal to a
     fraction, the numerator of which is the number of years and partial years
     of accredited service determined for such Participant in 

                                       4
<PAGE>
 
     the relevant period, and the denominator of which is the total number of
     years and partial years of accredited service determined for such
     Participant.

2.25 "Retirement Date" shall mean the date upon which a participant in the
     Retirement Plan becomes eligible to receive benefits thereunder, by
     attainment of the requisite age and service requirements and separation
     from employment or retirement, provided that the Retirement Date for
     Participants who separated from service from the Company and are described
     in the following clauses shall not occur prior to separation from the
     successor employers referred to in such clauses:

          (a) A Plastics Participant, as defined in Appendix J of the Retirement
     Plan (i) who separated from service under the Retirement Plan as of the
     Effective Date, as defined in Appendix J of the Retirement Plan and (ii)
     who was employed by Tenneco as of the Effective Date;

          (b) A Participant whose employment terminated as a result of the sale
     of the Nichols, Florida operations and who was employed, on the effective
     date of such sale, by Agrifos;

          (c) A Participant whose employment terminated as a result of the joint
     venture between Mobil Natural Gas, Inc. and PanEnergy and who transferred
     directly from the Company to PanEnergy;

          (d) Any other Participant who transfers from the Company to a
     successor employer in connection with a divestiture, joint venture, merger
     or similar transaction, to the extent that any Board resolutions of the
     Company or purchase and sale agreements or other formal documents approving
     or implementing the transaction call for a delayed Retirement Date
     hereunder.

2.26 "Retirement Plan" shall mean the Retirement Plan of Mobil Oil Corporation,
     as it may be amended and restated from time to time.

2.27 "Salary Group Cut-Off" shall be Salary Group 22, as determined by the
     Company, or such other salary group that is selected by the Vice President
     - Human Resources, upon advice of Counsel, to be consistent with the
     purposes of this Program.

2.28 "Savings Plan" shall mean the Employees Savings Plan of Mobil Oil
     Corporation, as it may be amended and restated from time to time.

                                       5
<PAGE>
 
2.29 "Supplemental Benefit Plan" shall mean the Supplemental Benefit Plan
     established by Mobil Oil Corporation effective January 1, 1976, as amended
     on various dates through December 31, 1997.

2.30 "Supplemental Retirement Benefit" shall mean a benefit determined in
     accordance with the provisions of Article III of Part II.

2.31 "Supplemental Savings Benefit" shall mean a benefit determined in
     accordance with the provisions of Article III of Part III.


                            Article III - Eligibility
                            -------------------------

3.1  A participant in the Retirement Plan or the Savings Plan, who satisfies the
     separate eligibility criteria set forth in Parts II, III, IV, or V herein
     shall be a Participant in this Program.

3.2  A Predecessor Plan Participant shall be a Participant in this Program,
     except that the provisions of Article IV of this Part and Parts II, III,
     IV, and V herein shall have no effect with respect to such a Participant.
     The amount and form of the benefit payable to such a Participant shall be
     determined in accordance with the provisions of the Supplemental Benefit
     Plan in effect on the date such Participant terminated employment with the
     Company.

3.3  An employee who is eligible to be a Participant pursuant to the provisions
     of any Part of this Program shall receive the benefit, if any, to which he
     becomes eligible pursuant to the provisions of that Part.


                   Article IV - Method of Payment of Benefits
                   ------------------------------------------

4.1 Method of Payment of Benefits - At or Above Salary Group Cut-Off. For a
    -----------------------------------------------------------------
Participant who, as of the date of termination of employment, is employed in a
salary group at or above the Salary Group Cut-Off, any benefits provided under
this Program shall be payable as follows:

          (a) The total benefit payable under Parts II and III, as applicable,
     of this Program to or on account of a Participant shall be paid in equal
     monthly installments for a period of years and months which shall be the
     greater of 10 years or one-half the Participant's life expectancy,
     determined pursuant to the appropriate single-life annuity tables
     promulgated in Treasury Regulations under Sec. 72 of the Code as in effect
     on the effective date hereof.

                                       6
<PAGE>
 
          (b) The amount of a Participant's monthly installments shall be
     determined as the sum of: (i) 1.7 times the monthly annuity (if any)
     determined under Section 3.2 of Part II; plus (ii) the amount of monthly
     installments for the period defined in paragraph (a), above, that would be
     equivalent to the sum of the lump sum amounts (if any) determined under
     Article III of Part III and Article III of Part V (other than such amounts
     paid immediately pursuant to Section 4.4(b) of this Part I), using interest
     on unpaid balances accruing from the last day of the month following the
     Participant's Retirement Date at a rate equal to the average yield to
     maturity for U.S. Treasury securities with ten year maturities for the six
     month period ending with the second month preceding the Participant's
     Retirement Date, increased by 100 basis points (1%).

          (c) Notwithstanding the foregoing, if the total monthly benefit
     payable under paragraph (b), above, is less than $1,000, the equivalent
     value of such total monthly benefit (computed on the basis of the interest
     rate specified in paragraph (b), above) shall be paid in a single sum.

4.2 Method of Payment of Benefits - Below Salary Group Cut-Off. For a
    -----------------------------------------------------------
Participant who, as of the date of termination of employment, is employed in a
salary group below the Salary Group Cut-Off, the benefits provided under this
Program shall be payable as follows:

          (a) The total benefits payable under any applicable Parts of this
     Program to or on account of a Participant shall be paid as a lump sum. The
     amount of a Participant's benefit shall be the sum of the lump sum amounts
     (if any) determined under Section 3.1 of Part II and under Parts III, IV,
     and V.

          (b) Notwithstanding the foregoing, if the total lump sum benefit
     payable under paragraph (a), above, expressed as an equivalent monthly
     benefit, using the interest rate specified in Section 4.1(b), above, and
     the payment period specified in Section 4.1(a), above, would be $2,500 or
     more, then the benefit shall be paid in the form of such equivalent monthly
     benefit.

4.3  Change in Interest Rate. The Company may, in its sole discretion, change
     ------------------------
     the interest rate set forth in Section 4.1(b) of this Article IV, except
     that any reduction in such rate shall be effective only with respect to a
     Participant whose Retirement Date is later than the date of such change.

4.4  Time of Payment.
     ----------------

          (a) Termination of employment at or after age 50. Except as provided
     in this Section 4.4(a), lump sum payments pursuant to this Article IV shall
     be made, and 

                                       7
<PAGE>
 
     installment payments pursuant to this Article IV shall commence, as of the
     last day of the month following the Participant's Retirement Date. If a
     Participant is entitled to severance benefits under any severance plan of
     the company, the commencement of benefit payments hereunder shall be
     deferred until the first month after the last month of the period for which
     such severance benefits are payable; provided that if the period for which
     severance benefits are payable ends after August 1 of any year, any lump
     sum payment hereunder shall be deferred until the first month of the next
     calendar year. If payment of any lump sum, or commencement of any annuity,
     is deferred pursuant to the foregoing sentence, the lump sum or annuity
     amount shall be increased by applying the interest rate set forth in
     Section 4.1(b) to the number of months of such deferral.

          (b) Termination of employment before age 50. If a Participant
     terminates employment prior to age 50, the Supplemental Savings Benefit
     shall be payable immediately in a lump sum. The balance of any payments
     shall be paid in a lump sum, or shall begin to be paid as an annuity, as
     applicable, on the last day of the month following the Participant's
     Retirement Date.

4.5  Death of Participant or Beneficiary.
     ------------------------------------
 
          (a) If the Participant dies after attaining age 50 but before
     commencing or receiving the entire amount of the benefits payable
     hereunder, the balance of such benefits shall be paid to his or her
     Beneficiary or Beneficiaries designated in accordance with the provisions
     of Article V herein in the same manner as such payments would have been
     made to the Participant. If no beneficiary is designated, or no beneficiary
     survives, the balance of any benefits payable hereunder shall be payable
     immediately to the Participant's estate in a lump sum.

          (b) If the Participant dies before attaining age 50, the amount of the
     benefits that would have been payable hereunder if the Participant's
     employment had terminated on the date of his or her death shall be payable
     immediately to the Beneficiary (or if no Beneficiary is designated or
     survives, to the Participant's estate) in an equivalent lump sum payment,
     using such actuarial assumptions as the Company in its sole discretion
     shall select.

          (c) If a Beneficiary who has begun receiving benefits hereunder
     pursuant to paragraph (a), above, dies before receiving the balance of all
     amounts that would have been payable to the Participant, the balance of
     such payments shall be made to any contingent beneficiary designated in
     accordance with the provisions of Article V herein, or, if no contingent
     beneficiary is designated or survives, to the Beneficiary's estate in a
     lump sum.

                                       8
<PAGE>
 
                    Article V - Designation of Beneficiaries
                    ----------------------------------------

5.1  A designation of a Beneficiary to receive benefits upon the death of a
     Participant shall be made in accordance with the following rules:

          (a) A Participant may, by written instrument signed by the Participant
     and delivered to the Company, name one or more persons as the Beneficiaries
     entitled to receive the amount, if any, payable under this Program upon his
     or her death. A Beneficiary designation shall also contain such other
     information as the Company may require. In the case of a Participant
     residing in a community property state, such Participant may not designate
     a Beneficiary other than his or her spouse to receive the benefits, if any,
     payable under his Plan, unless such spouse has consented in writing to such
     designation.

          (b) A designation of Beneficiary shall be effective upon receipt by
     the Company of the written instrument signed by the Participant. Such
     designation shall remain effective until either of the following events
     occur: (i) it is revoked or changed by the Participant or (ii) the
     designated Beneficiary dies before the Participant. A designation of
     Beneficiary may be changed or revoked by duly filing a new designation with
     the Company naming another person Beneficiary with respect to the same
     amount. The last such designation received by the Company shall be
     controlling; provided, however, that no designation, or change or
     revocation thereof shall be effective unless received prior to the
     Participant's death.

          (c) In the event of a dispute among Beneficiary claims, the Company
     may retain the amount in question, without liability for any interest
     thereon, until the rights thereto are determined, or may pay such amount to
     an appropriate court, and such payment shall discharge the Company's
     obligation to any person, trust or estate claiming an interest in such
     amount.

          (d) Acceptance of a designation of Beneficiary by the Company shall
     not constitute or be interpreted to be evidence of an acknowledgment that
     any person is a Participant under any of the provisions of this Program.


                            Article VI - Authorities
                            ------------------------

6.2  Program Not a Contract of Employment. This Program is not an employment
     -------------------------------------
     contract and neither the Program nor any action taken hereunder shall be
     construed as modifying the terms of any employee's or any Participant's
     employment, as giving to a Participant 

                                       9
<PAGE>
 
     the right to be retained in the employ of the Company or any Affiliated
     Company, or as inducing any employee to continue in the employ of the
     Company or any Affiliated Company. The Company or any Affiliated Company
     may terminate the Participant's employment as freely and with the same
     effect as if this Program were not in existence.

6.3  Binding Nature. This Program shall be binding upon and inure to the benefit
     ---------------
     of the Company and its successors and assigns and the Participant, his or
     her Beneficiaries and his or her estate. Nothing in this Program shall
     preclude the Company from consolidating or merging into or with, or
     transferring all or substantially all of its assets to another corporation
     which assumes this Program and all obligations of the Company hereunder .
     Upon such a consolidation, merger, or transfer of assets and assumption,
     the term "Company" shall refer to such other corporation; and this Program
     shall continue in full force and effect.

6.4  Non-Funded Nature. This Program shall be an unfunded plan and all payments
     ------------------ 
     hereunder shall be made out of general assets of the Company and no special
     or separate fund shall be established nor other segregation of assets made
     to create plan assets or to cause this Program to be a funded plan. The
     Company may, at its sole discretion, place assets in a trust that may be
     used to meet all or a portion of the Company's obligations hereunder, and
     any right of a Participant or Beneficiary to any benefit payments under
     this Program is reduced by identifiable payments from either the Company or
     the trustee of any such trust. The assets of any such trust shall be
     available to the Company's general creditors (or, as to Participants who
     are employees of a Participating Affiliate, the Participating Affiliate's
     general creditors) in the event of the Company's (or Participating
     Affiliate's) insolvency or bankruptcy. The rights of any Participant under
     this Program are the rights of unsecured general creditors of the Company
     (or Participating Affiliate).

6.5  Non-Assignability. No interest under this Program shall be subject in any
     ------------------
     manner to alienation by anticipation, sale, transfer, assignment,
     bankruptcy, pledge, attachment, charge or encumbrance of any kind, nor in
     any manner be subject to the debts or liabilities of any person and any
     attempt to so alienate or subject any such amount, whether presently or
     thereafter payable, shall be void.

6.6  Determination of Benefit. Except as expressly provided herein, whenever
     -------------------------
     under this Program it is necessary to determine whether one benefit is less
     than, equal to, or larger than another, or to determine the equivalent
     actuarial value of any benefit, whether or not such benefits are provided
     under this Program, such determination shall be made by the Company using
     mortality, interest, and other assumptions normally used at the time in
     determining actuarial equivalence under the Retirement Plan.

                                       10
<PAGE>
 
6.7  Withholding Taxes. The Company or its designated agent may withhold from
     -----------------
     any benefits payable under this Program all Federal, State, City or other
     taxes as shall be required pursuant to any law or governmental regulation
     or ruling.

6.8  Payment of Benefits to Minors or Incompetents. In the event that the
     ---------------------------------------------
     Company shall find that a Participant, a spouse, or a designated
     Beneficiary is unable to care for his or her affairs because of age, lack
     of capacity, illness or accident, the Company may direct that any benefit
     payment due him or her, unless claim shall have been made therefore by a
     duly appointed legal representative, shall be paid to the spouse, a child,
     a parent, or other relative, or to a person with whom he or she resides, or
     any of them, in such manner and proportion as the Company may deem proper
     and any such payment so made shall be a complete discharge of the
     liabilities of the Company therefor.

6.9  Amendment and Termination. Prior to a Change in Control, this Program may
     -------------------------
     be amended, modified, suspended, or terminated, in whole or in part, by
     action of the Company at any time, but such action shall not (i) reduce the
     present value of any benefit which would otherwise be determined to be
     payable under Article III of Part II by an amount which is greater than the
     amount of the increase, if any, in the present value of the Participant's
     Current Benefit which occurs after the date of such action; (ii) reduce the
     amount of any Supplemental Savings Benefit credited to or for the account
     of a Participant under Article III of Part III for a period prior to the
     date of such action, or reduce any guaranteed notional earnings rate with
     respect to any amounts credited to the account of a Participant under such
     Article III to a rate lower than that in effect at the time the amounts
     were so credited; (iii) reduce any benefit determined under Article III of
     Part IV for a Participant whose Retirement Date is prior to the date of
     such action; (iv) reduce any benefit determined under Article III of Part V
     for a Participant whose Retirement Date is prior to the date of such
     action; (v) reduce the notional interest rate described in Section 4.1 of
     this Part, except with respect to a Participant whose Retirement Date is
     later than the date of such change; or (vi) reduce the benefit payable to a
     Predecessor Plan Participant under the provisions of the Supplemental
     Benefit Plan in effect on the date such Predecessor Plan Participant
     terminated employment with the Company. After a Change in Control, this
     program may not be amended, modified, suspended or terminated.

6.10 Effective Date. The Program, as herein set forth, was amended and restated
     --------------
     effective as of January 1, 1998.


                      Article VII - Rights of Participants
                      ------------------------------------

                                       11
<PAGE>
 
7.1  Annual Statement. The Company shall provide an annual statement to each
     ----------------
     person who is a Participant in this Program. Such statement will describe
     the benefits for which the Participant is or may become eligible and any
     relevant provisions of this Program affecting the receipt of such benefits.

7.2  Costs of Collection. The Company, in its sole discretion, may provide that
     -------------------
     if it should become necessary for a Participant to secure legal counsel to
     collect Program benefits, including benefits which the Company has
     acknowledged in a writing to the Participant as accrued under this Program,
     the Company will reimburse the Participant for the cost of such counsel as
     well as any other cost of collection.

7.3  Vested Rights. A Participant shall be vested in benefits under the various
     -------------
     components of the Program to the same extent as he or she is vested in
     benefits under the Retirement Plan or the Savings Plan, as applicable.


                  Article VIII - Administration of the Program 
                  --------------------------------------------

8.1  General Administration 
     ----------------------

          (a) The operation and administration of the Program shall be
     controlled and managed by the Company, acting through the Vice President -
     Human Resources and the Treasurer.

          (b) The Company shall, from time to time, establish guidelines with
     respect to the control and management of this Program and with respect to
     the claims review and appeal procedure under this Program.

          (c) In the exercise of their duties hereunder, the Vice President -
     Human Resources and the Treasurer may designate any other person or persons
     to carry out their functions and responsibilities.

          (d) All decisions, actions or interpretations by the Company shall be
     final, conclusive and binding on all parties.

8.2  Legal Interpretation. The text of this Program shall control, and the
     --------------------
     headings to the Parts, Articles, and Sections are for reference purposes
     only and do not limit or extend the meaning of any of the Program's
     provisions. The Program shall be governed by and constructed in accordance
     with the laws of the State of New York. Any interpretation of the Program
     by the General Counsel of the Company shall be conclusive as between the

                                       12
<PAGE>
 
     Company and its employees and retired or former employees and may be relied
     upon by Participants and all other parties in interest.

8.3  Records. The records of the Company and Affiliated Companies shall be
     -------
     conclusive in respect of all matters involved in the administration of this
     Program, the determination of eligibility of Participants, and the
     calculation of benefits.


                    Article IX - Non-Duplication of Benefits
                    ----------------------------------------

9.1      (a) If a Participant shall participate in another "excess benefit plan"
     of the Company or any Affiliated Company, benefits payable under such other
     excess benefit plan, to the extent attributable to the Limitation on
     Benefits (affecting the Retirement Plan), the Limitation on Contributions
     (affecting the Savings Plan), or the Limitation on Compensation (affecting
     both the Retirement Plan and the Savings Plan) which are the subject of the
     Program, shall reduce the Benefits otherwise payable under this Program.
     The decision of the Company as to duplication of benefits otherwise payable
     under this Program shall be final. For this purpose, if such other plan has
     as its purpose the intent to recompense its eligible participants for
     amounts affected by the Limitation on Benefits, the Limitation on
     Contributions, or the Limitation on Compensation, it will be deemed an
     excess benefit plan regardless of the terminology employed.

         (b) If the Limitation on Benefits or the Limitation on Compensation is
     changed after the Participant's Retirement Date with the effect of
     increasing the amount of benefit paid to or on account of a Participant
     under the Retirement Plan, the amount of any unpaid Supplemental Retirement
     Benefit determined under Article III of Part II may, in the Company's sole
     discretion, be reduced commensurate with the increase in the Retirement
     Plan benefit.


                      Article X - Participating Affiliates
                      ------------------------------------

10.1 Participation in Program
     ------------------------

         (a) Any Affiliated Company may become a Participating Affiliate with
     the consent of the Company upon the following conditions:

         (i) such Affiliated Company shall make, execute and deliver such
             instrument as the Company deems advisable; and

                                       13
<PAGE>
 
          (ii) such Affiliated Company shall designate the Company as its agent
               for purposes of this Program.

          (b)  Any such Participating Affiliate may by action of its Board of
     Directors withdraw from participation, provided that no such withdrawal
     shall adversely affect rights accrued to the date of withdrawal under this
     Program, as determined by the Company.

10.2 Effect of Participation. Each Affiliated Company which with the consent of
     -----------------------
     the Company complies with Section 10. 1 (a) shall be deemed to have adopted
     this Program and each of its Parts for the benefit of its employees who
     participate in the Retirement Plan and the Savings Plan.

                                       14
<PAGE>
 
                                    PART II

                      SUPPLEMENTAL RETIREMENT BENEFIT PLAN
                            OF MOBIL OIL CORPORATION


                               Article I - Purpose
                               -------------------

1.1  The purpose of the Supplemental Retirement Benefit Plan (hereafter in this
     Part II, the "Plan") is to provide its Participants benefits which would
     have been payable from the tax-exempt trust under the Retirement Plan but
     for the Limitation on Benefits and the Limitation on Compensation.


                            Article II - Eligibility
                            ------------------------

2.1  A Participating Employee in the Retirement Plan shall be a Participant in
     the Plan in any year in which his or her Potential Retirement Benefit (if
     he or she terminated employment and elected to receive retirement benefits
     at the earliest possible Retirement Date) is greater than his or her
     Current Benefit at such date. Such a Participant shall receive or have paid
     for his or her account a Supplemental Retirement Benefit in an amount
     determined under Article III of this Part.


                         Article III - Amount of Benefit
                         -------------------------------

3.1  Supplemental Retirement Benefit - Below Salary Group Cut-Off. The benefits
     ------------------------------------------------------------
described in this Section 3.1 apply only to Participants who are, at the date of
termination of employment, employed in a Salary Group below the Salary Group
Cut-Off:

          (a) The principal amount of the Supplemental Retirement Benefit
     payable to a Participant who retires under the terms of the Retirement Plan
     shall be a lump sum amount equal to the difference, as of the Participant's
     Retirement Date, between (i) the amount of the lump sum benefit which would
     have been payable to or on account of the Participant under the Retirement
     Plan without regard to the Limitation on Benefits and without regard to the
     Limitation on Compensation and (ii) the amount of the lump sum benefit
     actually payable to or on account of the Participant under the Retirement
     Plan.

          (b) The principal amount of the Supplemental Retirement Benefit
     payable to a Participant who terminates employment with a vested right
     under the Retirement Plan 

                                       15
<PAGE>
 
     shall be a lump sum amount equal to the difference, as of the first date
     the Participant could elect to receive benefits, between (i) the amount of
     the lump sum benefit which would have been payable to or on account of the
     Participant under the Retirement Plan without regard to the Limitation on
     Benefits and without regard to the Limitation on Compensation and (ii) the
     amount of the lump sum benefit actually payable to or on account of the
     Participant under the Retirement Plan.

          (c) The principal amount of the Supplemental Retirement Benefit
     payable for the account of a Participant who dies before the commencement
     of his or her benefits under the Retirement Plan shall be a lump sum amount
     equal to the difference, as of the date of the Participant's death, between
     (i) the amount of the lump sum benefit which would have been payable for
     his or her account under the Retirement Plan without regard to the
     Limitation on Benefits and without regard to the Limitation on Compensation
     and (ii) the amount of the lump sum benefit actually payable for his or her
     account under the Retirement Plan.

3.2  Supplemental Retirement Benefit - At or Above Salary Group Limit. The
     ----------------------------------------------------------------
benefits described in this Section 3.2 apply only to Participants who are, at
the date of termination of employment, employed in a Salary Group at or above
the Salary Group Cut-Off:

          (a) The annual annuity amount of the Supplemental Retirement Benefit
     payable to a Participant who retires under the terms of the Retirement Plan
     shall be an annual amount equal to the difference, as of the Participant's
     Retirement Date, between (i) the amount of the straight life annuity
     benefit which would have been payable to or on account of the Participant
     under the Retirement Plan without regard to the Limitation on Benefits and
     without regard to the Limitation on Compensation and (ii) the amount of the
     straight life annuity equivalent of the benefit actually payable to or on
     account of the Participant under the Retirement Plan.

          (b) The annual annuity amount of the Supplemental Retirement Benefit
     payable to a Participant who terminates employment with a vested right
     under the Retirement Plan shall be an annual amount equal to the
     difference, as of the first date the Participant could elect to receive
     benefits, between (i) the amount of the straight life annuity benefit which
     would have been payable to or on account of the Participant under the
     Retirement Plan without regard to the Limitation on Benefits and without
     regard to the Limitation on Compensation and (ii) the amount of the
     straight life annuity equivalent of the benefit actually payable to or on
     account of the Participant under the Retirement Plan.

          (c) The annual annuity amount of the Supplemental Retirement Benefit
     payable for the account of a Participant who dies after attaining age 50
     but before the 

                                       16
<PAGE>
 
     commencement of his or her benefits under the Retirement Plan shall be an
     annual amount equal to the difference, as of the date of the Participant's
     death, between (i) the amount of the straight life annuity benefit (based
     on the participant's age at death) which would have been payable for his or
     her account under the Retirement Plan without regard to the Limitation on
     Benefits and without regard to the Limitation on Compensation and (ii) the
     straight life annuity benefit actually payable for his or her account under
     the Retirement Plan.

          (d) The amount of the Supplemental Retirement Benefit payable for the
     account of a Participant who dies before attaining age 50 shall be an
     annual amount equal to the difference, as of the date the Participant would
     have attained age 50, between (i) the amount of the straight life annuity
     which would have been payable for his or her account under the Retirement
     Plan had he or she retired on that date without regard to the Limitation on
     Benefits and without regard to the Limitation on Compensation and (ii)
     straight life annuity which would have been payable for his or her account
     under the Retirement Plan had he or she retired on that date after
     application of the Limitation on Benefits and the Limitation on
     Compensation.

          (e) The amount of the benefit actually payable under the Retirement
     Plan, for purposes of paragraphs (a), (b) (c) and (d), above, shall be the
     straight life annuity of equivalent value (using the Retirement Plan's
     mortality and interest rate factors applicable to retirement lump sums) to
     the lump sum actually payable from the Retirement Plan, or, if the
     Retirement Plan benefits are paid in any form other than a lump sum, the
     straight life annuity of equivalent value to the benefit actually payable
     using the Retirement Plan's applicable mortality and interest rate factors.

3.3  Determination of Amounts. The principal amount or annuity amount of the
     ------------------------
     benefit, if any, payable to or for the account of a Participant under this
     Article 3 shall be determined by the Company by the application of such
     assumptions, methods and procedures as the Company, in its sole discretion
     shall determine to be consistent with Section 6.6 of Part I of this
     Program.

                                       17
<PAGE>
 
                                    PART III

                        SUPPLEMENTAL SAVINGS BENEFIT PLAN
                            OF MOBIL OIL CORPORATION


                               Article I - Purpose
                               -------------------

1.1  The purpose of this Supplemental Savings Benefit Plan (hereafter in this
     Part III, the "Plan"), is to provide its Participants benefits which would
     have been payable from the tax-exempt trust under the Savings Plan but for
     the limitations imposed by the Limitation on Contributions and the
     Limitation on Compensation and to provide additional deferred compensation
     for a select group of management or highly compensated employees.


                            Article II - Eligibility
                            ------------------------

2.1  A Participant in the Savings Plan whose employer-corporation contributions
     (exclusive of such person's own contributions to the 401(k) Account) are
     reduced under the Savings Plan as a result of the Limitation on
     Contributions or as a result of the Limitation on Compensation shall be a
     Participant in the Plan. In addition, a Participant in the Savings Plan who
     is excluded from eligibility for the 2% (or 3%, as applicable)
     employer-corporation contribution to the 401(k) Account or who is excluded
     from eligibility for Savings Plan contributions in respect of short-term
     incentive awards under the Incentive Plan because he or she is employed in
     a salary group at or above the Salary Group Cut-Off shall be a Participant
     in the Plan. A Supplemental Savings Benefit shall be payable to or for the
     account of a Participant in an amount determined under Article III of this
     Part.


                        Article III - Amount of Benefits
                        --------------------------------

3.1  Supplemental Savings Benefit
     ----------------------------

          (a) If the contributions to a Participant's ESOP account under the
     Savings Plan are reduced in any year because of the Limitation on
     Contributions, the Limitation on Compensation, or a combination thereof, a
     principal amount equal to such reduction shall be credited hereunder in
     favor of the affected Participant.

                                       18
<PAGE>
 
          (b)   Effective February 1, 1990, if a Participant is ineligible to
     receive the 2% employer-corporation contribution to the 401(k) Account
     under the Savings Plan because he or she is employed in a salary group at
     or above the Salary Group Cut-Off, a principal amount shall be credited
     hereunder in favor of the affected Participant. The principal amount
     credited hereunder shall be:

          (i)   2% of such Participant's Base Pay (plus, after January 1, 1998,
                2% of the Participant's Eligible Above Base Pay); plus

          (ii)  an additional 1% of Base Pay (plus, after January 1, 1998, 1% of
                Eligible Above Base Pay) in the case of an employee described in
                the preceding sentence who satisfies the requirements of Section
                3.1.2 of the Savings Plan; plus
 
          (iii) in the case of a Director or Officer who waives participation in
                the ESOP, any amount that would have been credited under such
                ESOP.

          (c)   Effective January 1, 1998, if a Participant is ineligible to
     receive ESOP contributions under the Savings Plan in respect of amounts
     paid under the Incentive Plan, a principal amount shall be credited
     hereunder in favor of the affected Participant in the amount of 4% of
     Eligible Above Base Pay.

          (d)   Effective January 1, 1999, the principal amounts referred to in
     clause (i) of paragraph (b), above, shall no longer be credited. Effective
     January 1, 1999, the percentage referred to in paragraph (c) above shall be
     6%, rather than 4%.

          (e)   Principal amounts credited in favor of a Participant for a year
     shall be expressed in notional shares (and fractions thereof) of Mobil
     common stock. Such principal amounts shall accrue notional dividends
     (dividend equivalents) at the rates and times that dividends are paid on
     actual shares of Mobil common stock. Dividend equivalents credited in favor
     of a Participant shall be converted into additional notional shares (and
     fractions of shares) of common stock and shall accrue dividend equivalents
     as provided in the preceding sentence.

          (f)   Amounts credited in favor of a Participant as LTFI units
     pursuant to Predecessor Plan provisions or investment change elections as
     provided in Section 3.2 shall be credited with notional earnings equal to
     the amount of earnings which would have been allocable to the such
     principal amounts had they been invested (and earnings reinvested) in LTFI
     units for the period until the date as of which benefits are payable or, if
     applicable, the date of an investment change to notional Mobil common
     stock.

                                       19
<PAGE>
 
          (g) Notwithstanding any election made by a participant who is a
     Director or Officer pursuant to this Section 3.1(g) as in effect prior to
     August 15, 1996, all new principal amounts credited in favor of an Officer
     or Director on or after August 15, 1996, shall be expressed in notional
     shares of Mobil common stock as provided in Section 3.1(e) above.

          (h) No Supplemental Savings Benefit shall be provided in recognition
     of the effect of any reduction in the Participant's own permissible
     after-tax allotments or contributions to the Savings Account under the
     Savings Plan attributable to the Limitation on Contributions or the
     Limitation on Compensation nor for any reduction or limitation on the
     Participant's own contributions to the 401(k) Account under the Savings
     Plan.

3.2  Investment Changes
     ------------------

          (a) Once per year Participants who are age 55 years or older may
     elect, at such time and in such manner as shall be determined by the
     Company, to have a portion of the amount credited to the Participant in the
     form of notional Mobil common stock credited instead in the form of LTFI
     units as provided in Section 3.1(f) of this Part. The price of Mobil common
     stock for purposes of this conversion shall be the price in effect under
     the Savings Plan for instructions to sell received at the time the election
     hereunder is received by the Company. The number of shares of notional
     Mobil common stock that can be converted to LTFI units in any one year is
     25% of the total number of notional shares ever credited to the Participant
     (including any previously converted) minus the total number of shares
     previously converted. For a Participant whose age is 60 years or older, the
     preceding sentence shall be applied by substituting "50%" for "25%."

          (b) Once per year Participants shall have an opportunity, at such
     times and in such manner as determined by the Company, to elect to have
     amounts credited in LTFI units credited in notional shares of Mobil common
     stock, which shall accrue notional dividend equivalents as provided in
     Section 3.1(e). For purposes of conversions into notional Mobil common
     stock credits, the price in effect under the Savings Plan for instructions
     to purchase received at the time any election hereunder is received by the
     Company shall apply.

3.3  Benefit Amount at Retirement. The amount of a Participant's Supplemental
     ----------------------------
     Savings Benefit shall, at all times, be equal to (i) the sum of the annual
     principal amounts described in subsection (a), (b), (c) and (d) of Section
     3.1 and (ii) the aggregate amount of the notional earnings credited in
     favor of the Participant as provided in subsections (e), (f), and (g) of
     Section 3.1. Any amounts credited to the account of a Participant in the
     form of notional shares of Mobil common stock shall be converted to cash
     amounts as of 

                                       20
<PAGE>
 
     the Participant's Retirement Date. For purposes of this conversion, the
     price of notional Mobil common stock shall be the average of the prices
     used for purchases in the Savings Plan for the most recent consecutive six
     monthly periods ending before the Participant's Retirement Date.

3.4  Crediting of Interest. Any principal amounts credited to the account of a
     ---------------------
     Participant under this Part III as of a Participant's Retirement Date shall
     be credited with interest at the rate specified in Section 4.1(b) of Part I
     from the Retirement Date to the last day of the month following the
     Participant's Retirement Date.

                                       21
<PAGE>
 
                                     PART IV

                       RETIREMENT BENEFIT ENHANCEMENT PLAN
                            OF MOBIL OIL CORPORATION


                               Article I - Purpose 
                               -------------------

1.1  The purpose of this Retirement Benefit Enhancement Plan (hereafter in this
     Part IV, the "Plan") is to provide its Participants with a reasonable level
     of retirement benefits.


                            Article II - Eligibility
                            ------------------------

2.1  A Participant in the Retirement Plan who is employed in a salary group
     below the Salary Group Cut-Off shall be a Participant in this Plan, if the
     lump sum value of the Potential Retirement Benefit, calculated using the
     assumptions described in Section 3.1(a)(i) of this Plan is equal to or
     greater than the Eligibility Threshold Amount.


                         Article III - Amount of Benefit
                         -------------------------------

3.1  Retirement Enhancement Benefit
     ------------------------------

          (a) The amount of the Retirement Enhancement Benefit payable under
     this Plan shall be an amount equal to the difference, if any, between (i)
     the amount of the lump sum value of the benefit which would have been
     payable to or for the account of the Participant under the Retirement Plan
     without regard to any applicable Limitation on Benefits or Limitation on
     Compensation, determined by using an interest rate of 5% and Mobil Blended
     Unisex Mortality for the Prorated Benefit attributable to periods of
     accredited service prior to February 1, 1985; 9 1/2% and Mobil Blended
     Unisex Mortality for the Prorated Benefit attributable to periods of
     accredited service after February 1, 1985, but prior to June 1, 1986; and
     the applicable interest rate and mortality basis as provided in the
     Retirement Plan for the Prorated Benefit attributable to periods of
     accredited service after June 1, 1986, and (ii) the amount of the lump sum
     value of the benefit payable to or for the account of such Participant
     under the Retirement Plan determined under the relevant provisions of such
     Plan, without regard to any applicable Limitation on Benefits or Limitation
     on Compensation.

                                       22
<PAGE>
 
          (b) The determination of the amount of the benefit, if any, payable to
     or for the account of a Participant under this Section shall be made by the
     Company as of the earlier of the Participant's Retirement Date or the date
     benefits are first paid for his or her account under the death benefit
     provisions of the Retirement Plan and otherwise by the application of such
     assumptions, methods and procedures as the Company, in its sole discretion,
     shall determine to be consistent with Section 6.6 of Part I of this
     Program.

                                       23
<PAGE>
 
                                     PART V

                      RETIREMENT BENEFIT EQUALIZATION PLAN
                            OF MOBIL OIL CORPORATION


                               Article I - Purpose
                               -------------------

1.1  This Retirement Benefit Equalization Plan (hereafter in this Part V, the
     "Plan") was established by Mobil Oil Corporation effective as of June 28,
     1985. In order to retain the services of key employees of outstanding
     abilities and to motivate such employees to exert their best efforts, Mobil
     Oil Corporation has adopted a policy designed to provide such employees
     with a reasonable level of after-tax retirement benefits. The purpose of
     the Plan is to enable Mobil Oil Corporation to carry out such policy with
     respect to certain key employees designated as Participants.


                            Article II - Eligibility
                            ------------------------

2.1  A Participant in the Supplemental Retirement Benefit, Supplemental Savings
     Benefit, or Retirement Benefit Enhancement Plans set forth in Parts II, III
     and IV of this Program who was born prior to January 1, 1936, shall be a
     Participant in this Plan, and shall receive a Retirement Equalization
     Benefit determined under Article III of this Plan.


                        Article III - Amount of Benefits
                        --------------------------------

3.1  Retirement Equalization Benefit
     -------------------------------

          (a)   If an amount is payable to or for the account of a Participant
                pursuant to:

          (i)   Section 3.1 of Part II, the Supplemental Retirement Benefit Plan
                (applicable only to Participants employed in salary groups below
                the Salary Group Cut-Off);

          (ii)  Part III, the Supplemental Savings Benefit Plan; or

          (iii) Part IV, the Retirement Benefit Enhancement Plan (applicable
                only to Participants employed in salary groups below the Salary
                Group Cut-Off),

                                       24
<PAGE>
 
     a Retirement Equalization Benefit shall be paid under this Plan in favor of
     such Participant in respect of such amounts.

          (b) For a Participant who becomes eligible to receive a Retirement
     Equalization Benefit by reason of attaining his or her Retirement Date in
     1998 or later, the amount of Retirement Equalization Benefit to be paid
     shall be determined by multiplying each of the amounts referred to in
     paragraph (a), above, by the appropriate factors as set forth in the "Table
     for 1988" which is designated "Appendix A" to this Part.

          (c) The Company may, at its sole discretion, alter or amend the method
     used to determine the amount of any Retirement Equalization Benefit or
     increase, decrease or reduce to zero, the factors set forth in Appendix A
     by adoption of an additional table or tables, except that any such change
     shall have effect only with respect to Participants who first become
     eligible to receive or have paid on their account a benefit under this Part
     by reason of attaining their Retirement Dates or the occurrence of their
     death on a date which is later than the date of such change.

          (d) The determination of the benefit, if any, payable to or for the
     account of a Participant under this Section shall be made by the Company as
     of the Participant's Retirement Date or date of death.

                                       25
<PAGE>
 
                                                                         Table 1

                    1999 - 2001 TAX EQUALIZATION FACTOR TABLE
                             39.6% FEDERAL TAX RATE
    (Supplemental Plan Installment Payments of more than or equal to $250,000
                                    per year)


                                         Year of Retirement
 -----------------------------------------------------------------------------
        Year of Entry          1999            2000                2001
 -----------------------------------------------------------------------------
             1945              22.2            21.8                21.4
             1946              21.9            21.5                21.1
             1947              21.5            21.1                20.7
             1948              21.1            20.7                20.3
             1949              20.7            20.3                19.9
 -----------------------------------------------------------------------------
             1950              20.3            19.9                19.5
             1951              19.8            19.4                19.0
             1952              19.4            19.0                18.6
             1953              18.9            18.5                18.1
             1954              18.4            18.0                17.6
 -----------------------------------------------------------------------------
             1955              17.9            17.5                17.1
             1956              17.3            16.9                16.6
             1957              16.8            16.4                16.0
             1958              16.2            15.8                15.4
             1959              15.5            15.1                14.8
 -----------------------------------------------------------------------------
             1960              14.9            14.5                14.1
             1961              14.2            13.8                13.5
             1962              13.4            13.1                12.7
             1963              12.7            12.3                12.0
             1964              11.8            11.5                11.2
 -----------------------------------------------------------------------------
             1965              11.0            10.6                10.4
             1966              10.0             9.7                 9.5
             1967               9.1             8.8                 8.5
             1968               8.0             7.8                 7.5
             1969               6.9             6.7                 6.5
 -----------------------------------------------------------------------------
             1970               5.7             5.5                 5.3
             1971               4.4             4.3                 4.1
             1972               3.1             3.0                 2.9
             1973               1.6             1.5                 1.5
             1974               0.0             0.0                 0.0
 -----------------------------------------------------------------------------

                                       26
<PAGE>
 
Assumptions:

o    39.6% Federal tax rate

o    20% tax rate on long term capital gains (grandfathered for lump sum pension
     distributions).

o    5.7% hypothetical state tax rate and Federal conformity with respect to
     capital gains treatment.

o    Federal deduction for state tax is limited by 1991 tax law (to the lesser
     of 20% of the state tax rate or the state tax rate minus 3%).

                                       27

<PAGE>
 
- --------------------------------------------------------------------------------
                                   Exhibit 12

                                MOBIL CORPORATION
                COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                     (In millions, except for ratio amount)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                   Year Ended December 31,
                                     --------------------------------------------------
                                       1994       1995       1996      1997       1998
                                     -------    -------    -------   -------    -------
<S>                                  <C>        <C>        <C>       <C>        <C>    
Income Before Change in
  Accounting Principle ...........   $ 1,759    $ 2,376    $ 2,964   $ 3,272    $ 1,704
Add:
  Income taxes ...................     1,919      2,015      3,147     3,093      1,356
  Portion of rents representative
    of interest factor ...........       340        368        376       346        317
  Interest and amortization
    of debt discount expense .....       461        467        455       428        451
  Earnings less (greater)
    than dividends from
    equity affiliates ............       (40)       (51)       153       (59)       329
                                     -------    -------    -------   -------    -------
Income as Adjusted ...............   $ 4,439    $ 5,175    $ 7,095   $ 7,080    $ 4,157
                                     =======    =======    =======   =======    =======

Fixed Charges:
  Interest and amortization
    of debt discount expense .....   $   461    $   467    $   455   $   428    $   451
  Capitalized interest ...........        37         47         78       101         74
  Portion of rents representative
    of interest factor ...........       340        368        376       346        317
                                     -------    -------    -------   -------    -------
Total Fixed Charges ..............   $   838    $   882    $   909   $   875    $   842
                                     =======    =======    =======   =======    =======

Ratio of Earnings to Fixed Charges       5.3        5.9        7.8       8.1        4.9
                                     =======    =======    =======   =======    =======
</TABLE>

For the years ended December 31, 1994, 1995, 1996, 1997, and 1998, Fixed Charges
exclude $37 million, $28 million, $24 million, $29 million and $25 million,
respectively, of interest expense attributable to debt issued by the Mobil Oil
Corporation Employee Stock Ownership Plan Trust and guaranteed by Mobil.

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

Mobil                              - 29 -


<PAGE>
 
Five-year cumulative total return 

                           [BAR GRAPH APPEARS HERE]

Mobil              262
S&P 500            293
Industry Group     244

Assumes $100 invested on December 31, 1993, in Mobil common stock, S&P 500
Index, and a composite index, weighted by market capitalization each year, of
the following seven petroleum companies: Exxon Corporation, Chevron Corporation,
Royal Dutch Petroleum Company/"Shell" Transport and Trading Company p.l.c.,
Atlantic Richfield Company, British Petroleum Company p.l.c. and Texaco Inc.

Total return assumes reinvestment of dividends.

Financial highlights

                                                 1997         1998      %Change
- --------------------------------------------------------------------------------
Net income (millions)                        $  3,272     $  1,704          (48)
  Per common share (based on
   average shares outstanding)                   4.10         2.12          (48)
  Per common share assuming
    dilution                                     4.01         2.10          (48)
   (based on average shares
     outstanding)
- --------------------------------------------------------------------------------
Return on average shareholders'
  equity                                         17.0%         9.0%         (47)
Return on average capital employed               13.4%         7.7%         (43)
Income per dollar of revenue                      5.0 cents    3.2 cents    (36)
Petroleum earnings per gallon sold                5.1 cents    2.6 cents    (49)
- --------------------------------------------------------------------------------
Revenues  (millions)                         $ 65,906     $ 53,531          (19)
Total assets, year-end (millions)              43,559       42,754           (2)
Investment spending (millions)                  5,306        5,500            4
Shareholders' equity, year-end
  (millions)                                   19,461       18,370           (6)
  Per common share (based on
   shares outstanding at year-end)              24.41        23.31           (5)
- --------------------------------------------------------------------------------
Common shares outstanding,
  year-end (thousands)                        783,364      780,533            0
Shareholders of common stock,
  year-end                                    186,200      178,700           (4)
Number of employees, year-end                  42,700       41,500           (3)
- --------------------------------------------------------------------------------

Table of contents 

Letter to Shareholders          1
Mobil at a Glance               4
The Year in Review              5

FINANCIAL SECTION 

Highlights                     13
Management Discussion 
  and Analysis                 14
Consolidated Financial 
Statements                     31
Notes to Financial Statements  38
Reports of Management and
  Independent Auditors         53
Supplementary Information      54
Shareholder Information        64
Directors and Officers         65 
<PAGE>
 
- --------------------------------------------------------------------------------
                             LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------

           [PICTURES OF LUCIO A. NOTO & EUGENE A. RENNA APPEARS HERE]

Dear shareholder:

     In a difficult year for the oil industry, Mobil's employees worked hard to
reduce costs, increase trade sales and improve performance. Their success at
self-help in 1998 offset about $500 million of the $1.4 billion impact of the
deterioration in industry fundamentals. With sharply lower crude oil and natural
gas prices and generally lower product margins, especially in Asia, 1998 wasn't
nearly as bad an operating year as it might have been. 

     After three straight years of setting records, Mobil's operating profits
for 1998 declined 31 percent to just under $2.4 billion. We fared considerably
better than most of our competitors, largely because of Mobil's strengths in
marketing and refining and because of our self-help programs.

     Crude oil prices were about $6.50 per barrel lower in 1998 than in 1997,
and natural gas prices fell about $.50 per thousand cubic feet. The weak prices
stemmed from higher overall OPEC production, a mild winter in the Northern
Hemisphere and the severity of Asia's economic crisis, which limited worldwide
energy and petrochemical demand growth.

     Upstream (exploration and producing) operating earnings fell 53 percent to
$1 billion, primarily because of lower oil and natural gas prices as well as
slightly lower volumes and higher exploration expenses. Chemical profits
declined 46 percent to $190 million because of lower polyethylene and paraxylene
margins.

     On the other hand, our downstream (marketing and refining) operating
earnings set an all-time record of $1.4 billion, an 8 percent increase over
1997. It was the second consecutive year of record U.S. Marketing and Refining
earnings, and even in Asia's slumping markets, our downstream earnings improved
slightly.

How we helped ourselves

There were other bright spots as well:

     . Upstream, we replaced 165 percent of the oil and gas reserves we used --
our best year in reserve replacement since 1984. Proved reserves increased to
7.6 billion barrels of oil equivalent, and total resources increased to 28
billion barrels. We increased production in some key growth areas, including the
Tengiz field in Kazakhstan, the Hibernia field offshore Eastern Canada and
Equatorial Guinea's Zafiro field.

     . Behind our good downstream performance was an increase in trade sales of
4 percent worldwide, including an increase in U.S. gasoline sales of 5 percent;
the benefits of our joint venture with British Petroleum in Europe, leading to
record earnings there; the progress of our initiatives in Asia Pacific; and
excellent refinery performance worldwide.

     . Our business units identified, and committed to, an additional $500
million of initiatives to reduce costs and increase revenue versus a 1996 base.
This is on top of the $900 million we committed to in 1997. To date, we have
delivered about half of these $1.4 billion pretax benefits.

     . Our company-wide unit operating costs declined more than 4 percent in
1998 to $4.53 per barrel of oil equivalent.

     . We increased our dividend for the 11th consecutive year in 1998. Our
year-end debt-to-capitalization ratio of 29 percent, while up, remained at a
level we're comfortable with.

Merger announcement

The biggest news of the year was our agreement to a merger transaction with
Exxon. If approved, the combined company, to be called Exxon Mobil Corporation,
will have its headquarters in Irving, Texas. It will be organized functionally,
with worldwide downstream headquarters in Fairfax, Virginia, and worldwide
upstream and chemical headquarters in Houston, Texas.


Mobil

                                                                               1
<PAGE>
 
     We are limited in what we can say about the proposed merger at this time,
but we'd like to make it clear that we believe this is in the best interest of
our shareholders. It is not size that drives this combination, but the desire to
bring together two outstanding organizations with a demonstrated track record of
achievements -- organizations that share common values, that employ compatible
strategies, and that together should be able to achieve more than either could
alone.

Areas for upstream expansion

Among Mobil's strengths is the solid portfolio of growth opportunities our
people have developed in areas relatively new to us as well as those where we
have had a long history of operating successfully. 

     The East Coast of Canada is quickly becoming a new upstream core area for
us. The Hibernia field grew to about 100,000 barrels a day (Mobil's share, 33.1
percent) in the fourth quarter of 1998, the end of its first full year of
production. Development continued in the Sable Offshore Energy Project, while
additional sales contracts were signed for its natural gas. We expect production
to begin there in November 1999. And development began on the Terra Nova oil
field.

     In the Caspian region, our relationships in Kazakhstan, Turkmenistan and
Azerbaijan are progressing. Mobil's share of oil and natural gas production from
the Tengiz field in Kazakhstan reached 52,000 barrels of oil equivalent a day,
and the Caspian Pipeline Consortium received permits to begin construction.
Along with our partners, we exported our first barrel of crude oil from
Turkmenistan.

     In West Africa, OPEC quotas constrained our crude oil production in
Nigeria, but the good news is that the Oso gas liquids project began exporting
and will contribute to increased Nigerian production in 1999. At the same time,
we're expanding production in Equatorial Guinea and continuing to explore
offshore in both countries. 

     Our worldwide LNG business is a major strength for Mobil. In Qatar, Mobil
is beginning the third year of LNG exports from the Qatargas project and will
begin exporting from the RasGas project later in 1999. We succeeded in securing
sole negotiating rights for the sale of 7.5 million metric tons of LNG a year to
an Indian consortium, which when finalized would bring contracted sales volumes
from RasGas to 12.3 million tons a year. In Indonesia, Mobil has been an LNG
industry pioneer since the 1970s, and new fields are coming on stream to
supplement declining production from the Arun field.

     Elsewhere in Indonesia, we experienced a series of exploration successes as
we celebrated the 100th anniversary of doing business there. We made other
discoveries during 1998 in Australia, Italy, Equatorial Guinea, the deepwater
Gulf of Mexico, Norway, Peru and Venezuela. In Venezuela, our Cerro Negro heavy
oil project obtained $900 million in limited recourse funding and is progressing
on schedule. 

     In the U.S., Mobil swapped some Gulf of Mexico shelf assets with Arco for
that company's long-lived properties in California. As a result, we were able to
increase our equity interest in the Aera joint venture with Shell from 41.4
percent to 48.2 percent while increasing reserves and cutting costs.

Progress downstream

Our downstream strengths have been providing us with some buffer against
declining oil prices. We owe our marketing success in part to innovative
programs like the Speedpass(TM) quick-payment system and On The Run(R)
convenience stores in North America.

     We have already mentioned that we are pleased with the progress we have 
made with our Asia Pacific initiatives. Despite the economic downturn in Asia, I
consider our 


2                                                                        Mobil
<PAGE>
 
solid position in the region to be a long-term plus. 

     Mobil's refineries around the world are in good shape. While we have
rationalized part of our refining network, a sizable portion of the lost
capacity has been offset through low-cost debottlenecking projects at some
remaining facilities.

     Although the chemical industry is in a down part of the business cycle, we
are proceeding with the expansion of our Saudi joint-venture petrochemical
complex, and our joint venture to build a petrochemicals plant in Venezuela is
currently in the first phase of engineering. We are also modernizing and
expanding our Beaumont, Texas, olefins plant and have completed a similar
project in Houston.

Capital spending

With the current depressed industry conditions, we are prudently scaling back
nonessential investments. Mobil announced a projected investment program of $4.8
billion in 1999, down about 13 percent from 1998's investment spending. We are
proceeding with a capital program that strikes a balance between projects that
provide short-term earnings and cash flow, and those that underpin long-term
growth. While our investment spending has slowed on some projects, few
exploration or producing opportunities have been eliminated.

     We remain flexible about our spending plans and will revise them if crude
oil prices fail to improve or if attractive investment opportunities develop.

     Regarding our Environmental, Health and Safety (EHS) goals, Mobil had mixed
results in 1998. Both a pipeline rupture offshore Nigeria, which prevented us
from making progress on reducing the volume of oil spills, and our 24 worldwide
employee and contractor fatalities were simply unacceptable. While the rate of
injuries and illnesses declined 30 percent, we are not satisfied with our
overall EHS performance and have instituted programs to prevent a recurrence.

Board retirements

Mobil Executive Vice President and Director Robert O. Swanson retired on August
1, 1998, after 40 years of distinguished service with Mobil. His leadership
abilities, exceptional judgment and astute management insight will be remembered
with gratitude.

     On May 1, 1999, two of our nonemployee directors -- Lewis M. Branscomb and
Allen E. Jacobson -- will step down from the board after reaching retirement
age. Dr. Branscomb served the board for 21 years and Mr. Jacobson for 11. We'd
like to thank them both for their dedication to Mobil and for their wise
counsel.

A name to carry forward

     While 1998 was a challenging year, we believe that we have acted prudently
to improve efficiency and enhance shareholder value. Over the last 10 years,
Mobil has led the industry with its total return to shareholders, which was
comparable to the Standard & Poor's 500. Our five-year total return, while
trailing the S&P 500, exceeded the average of our competitors.

     As we write this, we can't say exactly what lies ahead, but we know that
Mobil has a proud history. Mobil people have reached across geographic and
cultural barriers time and again to meet every sort of challenge the energy
business can present.

     The talent and commitment of Mobil's diverse work force around the globe
has given our company a tradition to be proud of. The firm foundation that our
employees have built enabled us to carry forward even in these most-challenging
times .

/s/ Lucio A. Noto

Chairman and Chief Executive Officer

/s/ Eugene A. Renna

President and Chief Operating Officer

Mobil                                                                        3
<PAGE>
 
- --------------------------------------------------------------------------------
                               Mobil at a Glance
- --------------------------------------------------------------------------------


Mobil Corporation

With a history dating back to 1866, Mobil's energy and petrochemicals businesses
reach into some 140 countries. For 1998, revenues were $53.5 billion and
operating income was almost $2.4 billion. Our investment spending reached $5.5
billion.

Upstream

We produce oil and natural gas in 20 countries and have exploration activities
in 34. During 1998 we produced 1.71 million barrels a day of oil equivalent and
replaced 165 percent of what we produced with new proved reserves. New projects
enhance our strong liquefied natural gas position.

Downstream 

Our network of 23 refineries around the globe processes crude oil into fuels,
lubricants and petrochemical feedstocks. We sell 3.4 million barrels of refined
products a day in about 100 nations, in part through our more than 15,000
Mobil-branded service stations.

Chemical 

Mobil Chemical manufactures and markets basic petrochemicals, additives and
synthetics, catalysts and flexible packaging films. We operate 28 facilities and
market in more than 100 countries, with sales of more than four million tons in
1998.

Technology 

Through the partnership of Mobil Technology Company and the business units,
technology is embedded in every segment and every location of Mobil's
operations. Technology has reduced costs and created new products and growth
opportunities.


4                                                                       Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                               The Year in Review
- --------------------------------------------------------------------------------

Partnerships, expansions, realignments and a turbulent business environment made
1998 a year of change for Mobil -- a year in which we advanced our competitive
strategies.

     An organizational realignment created seven business units grouped
functionally. At the same time, we entered into or advanced a number of
cooperative ventures around the world and made progress on major projects. Then,
as the year's end approached, we announced a merger agreement with Exxon
Corporation. Pending approvals, the combined Exxon Mobil organization should be
able to achieve more than either company could achieve alone.

     On the pages that follow, we review key events of the year, following a
month-by-month timeline.


Mobil                                                                        5
<PAGE>
 
- --------------------------------------------------------------------------------
                               The Year in Review
- --------------------------------------------------------------------------------

Jan

Mobil increased its quarterly dividend by an annualized 7.5 percent
after announcing that its 1997 operating earnings reached a record $3.43
billion. 

     Mobil signed an exclusive five-year lubricant supply agreement with
Chrysler Europe. By year-end 1998, Mobil's downstream joint venture with BP in
Europe had initiatives in place to achieve its anticipated benefits.

     The company and American Forests announced a partnership in support of the
Global ReLeaf 2000 campaign. With a $500,000 donation, Mobil agreed to sponsor
the planting of 500,000 trees in four Global ReLeaf Forests in the United States
in 1998.

              [PICTURE OF PLANTING A TREE IN FLORIDA APPEARS HERE]

Feb

The month was one of change within the Mobil organization. Following the
election of Eugene A. Renna as president and chief operating officer of Mobil,
effective March 1, a new structure was announced. The company's operations were
organized into seven major business groups and a strengthened global shared
services department.

     Off the east coast of Canada, Mobil and its partners agreed to start
development of the Terra Nova oil field, which lies two miles below the ocean
floor in 300 feet of water on the Grand Banks of Newfoundland. Mobil's share in
Terra Nova, its third project offshore Eastern Canada, is 22 percent.

     Meanwhile, on the NASCAR Winston Cup auto racing circuit, the
Penske-Kranefuss Racing Ford Taurus selected Mobil 1(R) fully synthetic motor
oil as its sponsor. And, when the Formula One season ended, a car using Mobil
products and its driver won their respective world championships.

     The performance advantages of Mobil 1 lubricants were recognized again the
following month when the American Chemical Society named as Heroes of Technology
a team of current and former Mobil Technology Company researchers who worked on
the development of the synthetic oil.

      [PICTURE OF WEST MCLAREN MERCEDES FORMULA ONE RACE CAR APPEARS HERE]


6                                                                         Mobil
<PAGE>
 
Mar
 
Mobil Corporation and Ford Motor Company entered into a broad-based strategic
alliance to speed the development and integration of breakthrough fuel and
vehicle technologies. Mobil Chairman and CEO Lucio A. Noto said the alliance
"offers great potential to develop new hydrocarbon-based fuels and power sources
which could be of significant benefit to both the traveling public and the
environment."

     A milestone was reached when Mobil and its partners exported their first
cargo of crude oil from Turkmenistan. Another landmark was reached when Mobil
became the first foreign energy company to open service stations in Venezuela.
By the end of the year, Mobil had more than 60 strategic sites averaging more
than four million gallons of volume a year in key Venezuelan markets.

     In the United States, the Environmental Protection Agency named Mobil its
Energy Star Buildings Partner of the Year for its voluntary installation of
energy-efficient lighting and other emission-reducing technologies in the
company's facilities. Among other awards Mobil won during the year, the
Department of Minerals and Energy of Western Australia honored the company with
its Golden Gecko Award for Environmental Excellence.

          [PICTURE OF MOBIL RESEARCH ON FUEL TECHNOLOGY APPEARS HERE]

       [PICTURE OF DOUBLE-HULL TANKER PROVIDES ADDED SAFETY APPEARS HERE]

Apr

Mobil established a series of aggressive Environmental, Health and Safety goals,
along with related data-gathering practices, for its global operations. The
goals, running through 2003, focus on eliminating fatalities and greatly
reducing injuries, fires, explosions and oil spills. The company expanded its
internal reporting requirements so that it could collect worldwide data on its
air emissions, water discharges, waste generation and energy use.

     At year's end, Mobil's volume spilled increased, primarily because of a
pipeline rupture offshore Nigeria. The days-away-from-work injury and illness
rate for employees and contractors declined 30 percent, but fires and explosions
increased. And employee and contractor work-related fatalities increased to 24,
leading to a major road safety program, among other initiatives. Mobil Sekiyu in
Japan led the Mobil organization in safety.


                                                                               7
<PAGE>
 
- --------------------------------------------------------------------------------
                               The Year in Review
- --------------------------------------------------------------------------------

  [PICTURE OF SINGLE POINT MOORING SYSTEMS & MODEL OF OFFSHORE REGASIFICATION
                                 APPEARS HERE]

May

Mobil introduced a new technology for the offshore regasification and storage of
liquefied natural gas (LNG). The new Mobil Shipboard Regasification Terminal
(SRT), with a lower capital cost than onshore facilities, offers the potential
to advance LNG deliveries to emerging markets or those in environmentally
sensitive areas. SRT expands the LNG market by making it practical to sell LNG
to customers who need smaller quantities.

     Plans were unveiled to build a 65-million-gallon-a-year plant to make
cyclohexane -- used in the manufacture of nylon -- at Mobil's petrochemicals
complex in Beaumont, Texas. The complex is scheduled to begin operation in the
third quarter of 1999. Meanwhile, the first phase of engineering began for the
planned petrochemical facility in Jose, Venezuela. The project is a joint
venture between Mobil and Pequiven, Venezuela's state-owned petrochemicals
company, to manufacture ethylene and convert it into polyethylenes and ethylene
glycols.

Jun

The Cerro Negro heavy oil project in Venezuela obtained $900 million in limited
recourse funding, one-third through banks and the rest in the form of bonds. The
joint venture among Mobil (41.67 percent), Petroleos de Venezuela S.A. (41.67
percent) and Veba Oel (16.66 percent) is expected to begin production in late
1999 and reach 120,000 barrels a day in 2001 after construction of a facility to
upgrade the extra-heavy crude into a synthetic oil.

     In Bangladesh, the government approved a joint venture between Mobil and
Jamuna to sell lubricants and liquefied petroleum gas (LPG), while in Vietnam an
agreement was completed with Mitsui/Unique Gas for another lubricants-and-LPG
joint venture.

     Mobil introduced three grades of Mobil 1(R) fully synthetic motor oils
formulated to meet manufacturers' viscosity specifications for four-stroke and
two-stroke motorcycles.

     In a strategic alliance with MCI Worldcom Inc., Mobil expanded its Mobil GO
Card nationwide in the United States. The prepaid card can be used to purchase
food and fuel at Mobil stations as well as long-distance telephone service.
Offered in $25, $50 and $100 denominations, the card can be "recharged" by phone
when its value is depleted.

          [PICTURE OF THE CERRO NEGRO HEAVY OIL PROJECT APPEARS HERE]


8
<PAGE>
 
- --------------------------------------------------------------------------------

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

       [PICTURE OF USING A MOBIL SPEEDPASS(TM) TRANSPONDER APPEARS HERE]
Jul

Mobil experienced a series of exploration successes in Indonesia. Two
exploratory wells confirmed and expanded an oil and natural gas discovery made
in 1997 in the Greater Merah Besar area offshore East Kalimantan. A few weeks
later, the West Seno-2 well, 13 miles to the northeast, came in as another oil
and gas discovery. Both discoveries were made under a production-sharing
contract in which Mobil owns a 50 percent interest.

     During 1998, Mobil celebrated 100 years of doing business in Indonesia, 30
years as a production-sharing contractor, 20 years as a producer of liquefied
natural gas (from the Arun field in North Sumatra) and 10 years as a producer of
liquefied petroleum gas. Before year's end, the company completed initial
development of the Pase-A gas field, a satellite to the Arun field.

     Mobil had other exploration successes during the year in Norway, Italy and
Venezuela and expanded its acreage in the U.K. North Sea, the deepwater Gulf of
Mexico and offshore Eastern Canada.

     While celebrating its first year back in South Africa, Mobil signed
lubricant marketing agreements with black-empowerment partners Exel Petroleum
and the Bafokeng nation.

     In the United States, Mobil announced a major expansion of its 
Speedpass(TM) system, which allows customers to buy gasoline without opening
wallets or purses for credit cards or cash. The number of service stations
equipped with Speedpass(TM) reached 3,300, in all of Mobil's major U.S.
marketing areas. By year's end, more than two million enrolled motorists had the
miniature transponders for their key chains or rear windows that enable them to
drive in, fuel up and drive off in record time.

          [PICTURE OF THE CERRO NEGRO HEAVY OIL PROJECT APPEARS HERE]

                                                                               9
<PAGE>
 
- --------------------------------------------------------------------------------
                               The Year in Review
- --------------------------------------------------------------------------------


        [PICTURE OF WORKERS INSTALL RISER FOR OSO DRILLING APPEAR HERE]

Aug

In West Africa, the Oso natural gas liquids project in Nigeria exported
its first cargo. Within a few weeks, production reached 25,000 barrels a day.
Meanwhile, Mobil announced that it planned to increase crude oil production in
Equatorial Guinea. Later in the year, Mobil signed an agreement to evaluate the
potential of acreage offshore the Democratic Republic of Sao Tome and Principe,
an island state further south in West Africa. 

     Mobil reached an agreement with Atlantic Richfield Company (Arco) to
exchange its interest in some producing and non-producing properties on the Gulf
of Mexico shelf for Arco's California long-lived assets there. When the exchange
was completed in November, the newly acquired California properties were turned
over to Aera Energy LLC, an alliance between Mobil and Shell, boosting Mobil's
equity interest in Aera from 41.4 percent to 48.2 percent.

     Mobil and Texaco signed agreements with two Russian companies to
participate in exploration and producing projects on Sakhalin Island, in the
far-eastern region of Russia.

Sep

To reduce costs and improve performance, Mobil and Arco British Ltd. agreed to
combine the offshore operations of 15 gas fields in the U.K.'s southern North
Sea under a single management company. Later in the fall, production began from
the Malory gas field, which is in the covered area, and the Nevis North oil and
gas field, which is not. 

     Also, off the northwest coast of Australia, Mobil made another discovery of
natural gas and condensate. Mobil, the operator, has a 35 percent interest in
the well, called John Brookes-1. Elsewhere in the area, Mobil had recently made
the Woolybutt and Pitcairn oil discoveries and the Athena gas and condensate
discovery, while nearby in Papua New Guinea it made the Moran discovery. 

     RasGas, a joint venture of Qatar General Petroleum Corporation and Mobil,
was the successful bidder in an LNG tender sponsored by the Indian consortium
Petronet LNG Ltd. By the end of the year, Petronet, RasGas and Mobil had signed
principles of agreement covering the sale and purchase of 7.5 million tons of
LNG annually for 25 years. The three companies also intend to be partners in
developing LNG receiving terminals in the Indian cities of Dahej and Cochin.
Along with a previous agreement to supply Korea Gas Corporation, the Petronet
sales would bring the contracted volume of the RasGas LNG venture to 12.3
million tons a year.


     [A PICTURE OF CONSTRUCTION OF ONSHORE RASGAS FACILITIES APPEARS HERE]


10                                                                      Mobil
<PAGE>
 
          [PICTURE OF MODEL OF "SUPER SPONGE" MOLECULE APPEARS HERE]

Oct

With the signing of new agreements, contracts for the sale of Mobil's
share of natural gas from the Sable Offshore Energy Project (SOEP) reached more
than 97 million cubic feet a day. That represents about 40 percent of Mobil's
share of SOEP's expected initial production. Mobil holds a 50.8 percent working
interest in SOEP, off the coast of Nova Scotia. Delivery of gas to customers in
Eastern Canada and the Northeastern U.S. is expected to begin in late 1999.
Further north, in Canada's Grand Banks, the Hibernia crude oil field averaged
about 100,000 barrels a day of production in the fourth quarter. Mobil's share
in Hibernia is 33.1 percent. 

     Researchers from Mobil Technology Company and the U.S. Department of Energy
developed a new material that can serve as a microscopic "super sponge" to soak
up specific toxic metals and make contaminated water fit for drinking in
seconds. The new material is so porous that the internal surface area of two
teaspoons of it equals the size of a football field. The Mobil and government
researchers began work on scaling up the formulation for commercialization.

     Venezuelan author Ana Teresa Torres won the 1998 Mobil Pegasus Prize for
Literature for her novel, Dona Ines contra el olvido (Dona Ines Against
Forgetfulness). The prize carries with it $15,000, a gold medallion, translation
and publication of her book in English, and travel to promote the English
edition. Since its inception in 1977, the prize, whose winners are chosen by an
independent jury of experts, has been awarded in 13 countries where Mobil
conducts business. 

     In Texas, Mobil and Tetco Texas Holding Company, an existing Mobil
distributor, formed a limited partnership (Mobil share, 48.5 percent) to operate
a Mobil-branded distributorship called Tetco Stores LP.

      [PICTURE OF CONSTRUCTION OF ONSHORE RASGAS FACILITIES APPEARS HERE]


Mobil                                                                       11
<PAGE>
 
- --------------------------------------------------------------------------------
                               The Year in Review
- --------------------------------------------------------------------------------

Nov
        
The Caspian Pipeline Consortium, in which Mobil holds a 7.5 percent interest,
received approvals from Kazakhstan and Russia and made the decision to begin
construction in 1999. Before the end of 1998, Mobil was selected by the
government of Kazakhstan as one of the international energy companies to work
with Kazakhoil on a feasibility study for another project -- a potential
trans-Caspian oil and gas transportation system. Mobil called the new study the
next logical step to determine the commercial viability of additional
transportation systems. 

     Meanwhile, production from Kazakhstan's Tengiz field reached 210,000
barrels a day, more than double the 1996 level. Mobil owns 25 percent of the
joint venture that operates the field.

     Expanding its role in the marketing of oriented polypropylene (OPP), the
flexible packaging film, Mobil entered into an agreement with Hungary's largest
chemical company. The agreement calls for Mobil to supply technical assistance
to Tiszai Vegyi Kombinat Rt. (TVK) for construction of a new OPP line, with
Mobil and TVK marketing the film under their own names through their existing
channels.

         [PICTURE OF MOBIL OPP PLANT IN SHAWNEE, OKLAHOMA APPEARS HERE]

Dec

At year's end, nearly 10,000 workers were on site at the Yanpet petrochemical
expansion project in Yanbu, Saudi Arabia. During the year, the project completed
a number of heavy equipment lifts, including the heaviest onshore lift ever made
in the Middle East.

     Mobil and Qatar General Petroleum Corporation signed principles of
agreement for development of an Enhanced Gas Utilization Project. The project
would deliver up to 1.25 billion cubic feet a day of natural gas from Qatar's
North Field for power, petrochemical and other industrial customers in the
region. 

     Exxon and Mobil announced that they had reached an agreement to merge.
Exxon shareholders would own about 70 percent and Mobil shareholders about 30
percent of the merged company, which would be renamed Exxon Mobil Corporation.
Its headquarters would be in Irving, Texas, with worldwide downstream
headquarters in Fairfax, Virginia, and worldwide upstream and chemical
headquarters in Houston, Texas. L. R. Raymond would be chairman, chief executive
officer and president of Exxon Mobil, and L. A. Noto would be vice chairman of
the board. The merger is subject to shareholder and regulatory approval, as well
as other customary conditions.

       [PICTURE OF EXXON'S LEE RAYMOND AND MOBIL'S LOU NOTO APPEARS HERE]


12                                                                       Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                               Financial Section
- --------------------------------------------------------------------------------


                                   Highlights

     . Operating earnings declined 31% to $2.4 billion, an indication of the
tough business conditions in the oil and gas industry.

     . E&P operating earnings of $1.0 billion were adversely impacted by
significantly lower worldwide crude oil and natural gas prices. Worldwide
reserve replacement was 165% of production.

     . M&R operating earnings of $1.4 billion were the highest ever, reflecting
record U.S. performance for the second straight year, benefits from Mobil's
alliance with BP in Europe and business initiatives in Asia-Pacific.

     . Chemical operating earnings of $0.2 billion were depressed due to weak
margins for petrochemicals.

<TABLE> 
<CAPTION> 

Key Financial Indicators

(In millions, except per-share and ratio amounts)       1994           1995         1996         1997         1998 
- -------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>            <C>          <C>          <C>          <C> 
Operating Earnings(1)                               $  2,231(2)    $  2,846     $  3,097     $  3,430     $  2,366
Special Items                                           (472)          (470)        (133)        (158)        (662)
- -------------------------------------------------------------------------------------------------------------------
Income, Excluding the Effect of Change in
   Accounting Principle                             $  1,759(2)    $  2,376     $  2,964     $  3,272     $  1,704
Per common share                                        2.14(2)        2.93         3.69         4.10         2.12
Per common share-assuming dilution                      2.12(2)        2.88         3.62         4.01         2.10
Common Stock Dividends Per Share                        1.70           1.81         1.96         2.12         2.28
- -------------------------------------------------------------------------------------------------------------------
Capital and Exploration Expenditures                $  3,825       $  4,268     $  6,361     $  4,689     $  4,747
Cash Investments in Equity Companies                     102            257          658          617          753
- -------------------------------------------------------------------------------------------------------------------
Total Investment Spending                           $  3,927       $  4,525     $  7,019     $  5,306     $  5,500
- -------------------------------------------------------------------------------------------------------------------
Debt-to-Capitalization Ratio                              31%            27%          29%          25%          29%
Total Debt                                          $  7,727       $  6,756     $  7,875     $  6,664     $  7,701
- -------------------------------------------------------------------------------------------------------------------
Shareholders' Equity                                $ 17,146       $ 17,951     $ 19,072     $ 19,461     $ 18,370
Per common share                                       21.30          22.35        23.81        24.41        23.31
- -------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  Operating earnings exclude the effects of special items and change in
     accounting principle.

(2)  Excludes unfavorable effect of change in Inventory lower of cost or market
     policy in 1994 ($680 million).


Mobil                                                                       13
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------


Net Income
(Millions of dollars)

[BAR CHART APPEARS HERE]

1998     1,704
1997     3,272
1996     2,964
1995     2,376
1994     1,759*

*Excludes cumulative effect of change in accounting principle.

Mobil's income fell 48%, reflecting the impact of deteriorating industry
fundamentals across most of its businesses.

Graphs, charts and associated captions on pages 13-52 are not a part of the
Consolidated Financial Statements and Notes thereto.

Outlook

Although Mobil cannot be certain that its outlook for the petroleum and chemical
industries will prove accurate, described below are both known and anticipated
trends relevant to that outlook.

     Overall, the energy industry will remain highly competitive, and
significant capital investments to support operations and profitable growth will
continue to be required. These investments will be predominantly in
international areas because of the availability of opportunities. Due to the
size of such investments, and the time often needed to complete them, a
long-term view is required.

Oil and natural gas will continue to satisfy much of the world's energy needs
well into the 21st century. Over the long term, the company believes that the
prices of these commodities, and related profitability, will continue to be
volatile, influenced by market forces, political and economic uncertainties,
host country regulations and new production sources. During 1998, crude oil
prices declined significantly from average 1997 levels, in part due to limited
demand growth associated with the economic difficulties in the Asia-Pacific
region and a warmer than normal winter, and in part due to increased worldwide
production. In the near term, barring additional sustained production cutbacks
by producing countries, supply is expected to continue to exceed demand,
resulting in continuing pressure on prices and further industry restructuring
and consolidation. Mobil remains convinced that the Asia-Pacific region will be
a growth area for the future. 

     Mobil believes that, over the long term, the industry will continue to grow
in the international upstream sector where investment opportunities to find and
develop resources are abundant. Many countries, previously off-limits to the oil
industry, have opened up in the last few years to companies like Mobil who are
recognized for their financial and technical strengths. Mobil will look to these
areas to contribute to its program of replacing its hydrocarbon reserves and
providing production and earnings growth. 

     The marketing and refining industry will continue to face competitive
market pressures, and margins will remain volatile. Downstream margins in the
Asia-Pacific region weakened considerably in 1998 compared with average 1997
levels. Over the long term, worldwide downstream margins are expected to improve
gradually as demand growth outpaces capacity additions. Due to the competitive
environment, more downstream alliances are possible. Continuing environmental
expenditures will also be required worldwide. 

     The worldwide petrochemical business continues to be cyclical. In the near
term, both polyethylene and paraxylene margins are expected to remain under
pressure as new capacity is placed on stream, but they are expected to gradually
strengthen over the long term in response to demand growth.

     Mobil's overall investment program (see page 34) has been scaled back as a
result of depressed industry conditions. It will continue to reflect a strategy
to assess and manage political, economic and geologic risks. This strategy is
achieved through a geographically diverse portfolio of existing assets and
projects that will continue to require additional capital to fully develop. It
also employs the use of limited recourse financing, staged project development,
joint ventures and cash exposure management.

Exxon Mobil merger

On December 1, 1998, Mobil entered into a definitive agreement with Exxon
Corporation to merge the two companies. Under the terms of the agreement, each
share of Mobil common stock will be converted into 1.32015 shares of Exxon
common stock, and Exxon will change its name to Exxon Mobil Corporation. As a
result of the merger, existing Mobil shareholders will own about 30 percent of
the new company, while existing Exxon shareholders will own about 70 percent.
The merger is subject to shareholder and regulatory approval, as well as other
customary conditions.

14                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------


Financial Results

A discussion and analysis of consolidated financial and operating performance
appears on this page. Mobil's business segments are separately reviewed on pages
16-21. While reading these discussions, the reader may find it helpful to refer
to pages 30-52 for the Consolidated Financial Statements and commentary, and to
pages 54-63 for Supplementary Information.

Consolidated Results 

<TABLE> 
<CAPTION> 
Net Income (In millions, except per-share amounts)      1996       1997       1998
- ----------------------------------------------------------------------------------
<S>                                                  <C>        <C>        <C> 
Petroleum Operations
  Exploration & Producing                            $ 2,109    $ 2,212    $   644
  Marketing & Refining                                   913      1,025      1,016
- ----------------------------------------------------------------------------------
Total Petroleum                                        3,022      3,237      1,660
Chemical                                                 306        403        181
- ----------------------------------------------------------------------------------
Segment Earnings                                       3,328      3,640      1,841
Corporate and Financing                                 (364)      (368)      (137)
- ----------------------------------------------------------------------------------
Net Income                                           $ 2,964    $ 3,272    $ 1,704
  Per common share                                   $  3.69    $  4.10    $  2.12
  Per common share-assuming dilution                 $  3.62    $  4.01    $  2.10
- ----------------------------------------------------------------------------------
</TABLE> 
Mobil's earnings per share growth based on operating earnings attained first
quartile performance versus other major oil companies in 1998, a year in which
industry fundamentals deteriorated.

Consolidated Earnings 

(In millions)                                1996         1997         1998 
- --------------------------------------------------------------------------------
Net Income                                $ 2,964      $ 3,272      $ 1,704
Less: Special Items(1)                       (133)        (158)        (662)
- --------------------------------------------------------------------------------
Operating Earnings                        $ 3,097      $ 3,430      $ 2,366
- --------------------------------------------------------------------------------

(1)  Special items represent the earnings effects from events or circumstances
     not attributable to Mobil's ongoing operations. These special items are
     identified in the business segment tables that follow.

     In 1998, Net Income of $1,704 million was $1,568 million lower than in 1997
as higher net special charges and the unfavorable impact to operating earnings
of significantly lower industry prices and margins more than offset benefits
from self-help programs.

     Due to the poor industry fundamentals, net special charges for 1998 totaled
$662 million, mainly for the impairment of upstream properties and the impact of
lower prices on inventories. Restructuring-related provisions and other net
unfavorable items essentially offset the benefit resulting from the settlement
of prior years' tax disputes. Net special charges in 1997 totaled $158 million,
$504 million lower than 1998. The charges in 1997 were mainly for
restructuring-related provisions, litigation charges and a one-time performance
award to employees, partly offset by gains on the sale of non-core assets and
favorable inventory adjustments.

     In 1997, net income of $3,272 million was $308 million higher than in 1996,
primarily due to higher operating earnings slightly offset by higher charges for
special items. Charges for special items totaling $158 million were $25 million
higher than in 1996 and included charges for restructuring, partly offset by
gains on asset sales.

     In 1998, Operating Earnings were $2,366 million, $1,064 million lower than
in 1997. Industry factors were significantly unfavorable as lower worldwide
crude oil and natural gas prices, lower downstream margins in the U.S.,
Asia-Pacific and the Middle East and lower polyethylene and paraxylene margins
more than offset higher downstream margins in Europe. Lower upstream production
volumes and higher exploration expenses also hurt operating earnings. These
unfavorable factors were mitigated by self-help benefits, including strong
volume growth in the downstream, improved performance in lubes, certain tax
benefits, reduced refinery downtime, benefits from the Mobil-BP alliance in
Europe and business initiatives in Asia-Pacific. 

     In 1997, operating earnings were $3,430 million, up $333 million from 1996.
The improvement primarily reflected strong volume growth in the upstream
business, higher volumes in Chemical, improved performance by all business
segments and higher industry margins in the U.S. downstream and the polyethylene
businesses.

Annual Dividends (Per share of common stock, in dollars)

[BAR CHART APPEARS HERE]

1998         2.28
1997         2.12
1996         1.96
1995         1.81
1994         1.70
1993         1.63
1992         1.60
1991         1.56
1990         1.41
1989         1.28
1988         1.18

Dividend payments increased for the eleventh consecutive year.

Mobil                                                                         15
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------

Upstream Earnings 
(Millions of dollars)

[BAR CHART APPEARS HERE]

          
            Operating    Net
             Earnings   Income

1998          1,005       644
1997          2,138     2,212
1996          2,059     2,109

Lower worldwide prices, higher exploration expenses, lower production and asset
writedowns contributed to lower earnings.

Net Production 
(Thousands of barrels daily of oil equivalent)

[BAR CHART APPEARS HERE]

1998          1,713    
1997          1,753
1996          1,685

Natural field declines, OPEC constraints and a rationalized capital program
offset growth in Canada, Equatorial Guinea and Kazakhstan.

Petroleum Operations 
Upstream-Exploration & Producing

Exploration & Producing Segment Financial Indicators
- --------------------------------------------------------------------------------
(In millions)                                     1996       1997       1998
- --------------------------------------------------------------------------------
U.S. Income                                     $   737    $   697    $    11
International Income                              1,372      1,515        633
- --------------------------------------------------------------------------------
Total Upstream Net Income                       $ 2,109    $ 2,212    $   644
- --------------------------------------------------------------------------------
Revenues(1)                                     $12,841    $11,840    $ 8,643
- --------------------------------------------------------------------------------
Assets                                          $17,880    $18,468    $19,671
- --------------------------------------------------------------------------------
Capital Expenditures                            $ 3,914    $ 2,888    $ 2,925
Exploration Expenses                                512        499        643
Cash Investments in Equity Companies                520        277        384
- --------------------------------------------------------------------------------
Total Investment Spending                       $ 4,946    $ 3,664    $ 3,952
- --------------------------------------------------------------------------------
(1) Includes intersegment revenues.

Lower crude oil and natural gas prices adversely affected exploration and
producing income. Worldwide reserve replacement was 165% of production.

     With crude oil prices at their lowest level in over 15 years, lower natural
gas prices, a drop of 2% in production, higher exploration expenses, and
significant asset impairment charges, income decreased significantly.

     In 1998, Mobil produced 935,000 barrels per day of liquids and 4,296
million cubic feet per day of natural gas. Worldwide production decreased the
equivalent of 40,000 barrels of oil per day from 1997 due to natural field
declines in the United States and Europe, lower Indonesian volumes (Arun field),
limitations on production and operational problems in Nigeria and the effects of
prior year asset sales in various locations. New production from Canada, West
Africa, Kazakhstan and Turkmenistan somewhat moderated the overall production
decrease.

     At year end, the Hibernia field, off Eastern Canada, which came on stream
in late 1997, was producing about 100,000 barrels per day (Mobil share, 33.1
percent). While OPEC quota restrictions curtailed the production growth planned
for Nigeria, production from Equatorial Guinea increased 35% from 1997 levels.

     Mobil replaced 165% of its production with new reserve additions, compared
with a 146% replacement rate in 1997, with the most significant contribution
coming from the Cerro Negro heavy oil project in Venezuela. The proved reserve
base is now 7.6 billion barrels of oil equivalent. Mobil's focus for reserve
replacement continues to be exploration activities, participation in new
producing ventures and acquisitions.

     In 1998, 46 wildcat exploration wells were drilled, resulting in 10
discoveries. There were successes in Indonesia, Norway, deepwater Gulf of
Mexico, Peru and Italy. New acreage acquisitions and opportunities in the U.S.,
Canada, Italy, and West Africa (Sao Tome and Principe) also strengthened the
company's portfolio. In the U.S., Mobil added 98 blocks to its prospect
inventory in the deepwater Gulf of Mexico. Mobil was awarded six licenses on the
Grand Banks, offshore Newfoundland, Canada. This brings Mobil's holdings in the
area to 550,000 net acres. The 1999 acquisition of Lasmo's holdings in Italy
will allow Mobil and its partners to progress development plans of the Tempa
Rossa field. Depending on the technical evaluation of the deepwater blocks in
Sao Tome and Principe, Mobil may earn an exclusive option to negotiate a
production sharing agreement for the area.

     Investment spending in 1998 was $4.0 billion, up $0.3 billion from 1997. In
1997, investment spending was down $1.3 billion from 1996, which included the
acquisition of Ampolex and a 25% equity interest in the joint venture that owns
the Tengiz field. Planned investment spending for 1999 is $3.6 billion and
continues to be focused in international areas on strategic growth
opportunities. Several of the countries where Mobil has investments are subject
to political and economic uncertainties.

     Revenues decreased primarily due to the significantly lower crude oil and
natural gas prices reflecting the worldwide excess of supply over demand. In
1997, revenues decreased from 1996 primarily due to the full-year impact of
equity 

16                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------

Petroleum Operations (continued)

accounting for Mobil's gas marketing alliance with Duke Energy and Aera
Energy, the alliance with Shell in California.

     Upstream net income of $644 million was $1,568 million lower than in 1997
including $387 million for asset impairments recorded in accordance with Mobil's
policy described on page 38. Operating earnings of $1,005 million (U.S.,$196
million; International, $809 million; refer to tables that follow) decreased
$1,133 million, mainly due to the lower prices worldwide for crude oil and
natural gas, decreased production volumes and higher exploration expenses.

     Average worldwide crude oil prices in 1998 declined about $6.50 per barrel
from 1997 (see graph at right), reflecting increased supplies and slower demand
growth due to warmer weather and the economic downturn in Asia. International
natural gas prices also decreased as they tend to follow the movement of crude
oil prices. Mobil's U.S. average natural gas prices decreased about $0.40 per
thousand cubic feet as a result of low prices for competing fuel oil in the
industrial and commercial markets and lower demand in the residential market due
to milder winter weather.

     In 1997, net income of $2,212 million was $103 million higher than in 1996.
Operating earnings of $2,138 million increased $79 million as the effect of
increased liquids production in international areas was partly offset by higher
expenses for new business development and the effect of lower production in the
United States. The effects of higher natural gas prices, primarily in North
America, largely offset the impact of lower worldwide crude oil prices.


U.S. Exploration & Producing Earnings

(In millions)                                  1996        1997        1998
- --------------------------------------------------------------------------------
U.S. Income                                   $ 737       $ 697       $  11
Special Items in Income
  Asset impairment                              (69)         --        (156)
  Federal royalty settlement                     --          --         (29)
  Asset sales gains                             119          53          --
  Litigation                                     --         (12)         --
  Employee performance award                     --          (4)         --
  Restructuring provisions                       (7)         --          --
- --------------------------------------------------------------------------------
Operating Earnings
  (Excludes Special Items)                    $ 694       $ 660       $ 196
- --------------------------------------------------------------------------------

     U.S. Upstream operating earnings of $196 million in 1998 were $464 million
lower than in 1997, mainly due to lower prices for crude oil and natural gas,
the effects of lower production volumes due to natural field declines and prior
year asset sales, and higher exploration expenses.

     In 1997, operating earnings of $660 million were $34 million lower than in
1996, reflecting the effects of lower production volumes and lower crude oil
prices. The impact of lower volumes, due to natural field declines and the
carry-over effect of 1996 asset sales, was partly offset by benefits from new
capital programs. Earnings benefited from higher natural gas prices and lower
operating expenses.

International Exploration & Producing Earnings

(In millions)                                     1996       1997       1998 
- --------------------------------------------------------------------------------
International Income                           $ 1,372    $ 1,515    $   633
Special Items in Income
  Asset impairment                                  --         --       (231)
  Asset sales gains                                 12         41         55
  Employee performance
    award                                           --         (4)        --
  Restructuring provisions                          (5)        --         --
- --------------------------------------------------------------------------------
Operating Earnings
  (Excludes Special Items)                     $ 1,365    $ 1,478    $   809
- --------------------------------------------------------------------------------

     International Upstream operating earnings of $809 million were $669 million
lower than in 1997, mainly due to lower crude oil and natural gas prices.
Volumes were down slightly as reductions due to OPEC production constraints
mainly in Nigeria, natural field declines in Europe and the anticipated declines
in Indonesian volumes more than offset the effect of new crude production in
Canada, Equatorial Guinea, Kazakhstan, and Turkmenistan. Although exploration
expenses were higher, favorable currency impacts, certain tax benefits and the
sale of an independent power project in the United Kingdom reduced its effect.

     In 1997, operating earnings of $1,478 million were $113 million higher than
in 1996, principally due to the effects of higher production and higher natural
gas prices in Canada, partly offset by the impact of lower crude oil prices and
higher expenses in new venture areas.

Crude Oil Average Sales Prices
(Dollars per barrel)

[BAR CHART APPEARS HERE]

              U.S.     International

1998         10.48         12.29
1997         16.59         18.94
1996         17.40         20.81

Crude oil prices remained volatile in 1998, dropping about $6.50 per barrel.

Natural Gas Average Sales Prices 
(Dollars per thousand cubic feet)

[BAR CHART APPEARS HERE]

              International   U.S.

1998              2.17        1.98
1997              2.72        2.38
1996              2.66        2.17

Lower worldwide natural gas prices compounded the effects of lower crude oil
prices.

Mobil                                                                         17
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------


Petroleum Operations (continued)
Downstream-Marketing & Refining

Downstream Earnings
(Millions of dollars)

[BAR CHART APPEARS HERE]

                      1998     1997     1996

Net Income            1,016   1,025      913
Operating Earnings    1,420   1,312    1,051

Operating earnings in 1998 increased primarily due to improved performance, 
benefits from the Mobil-BP alliance, and initiatives in Asia-Pacific.


Refinery Runs for Mobil
(Thousands of barrels daily)

[BAR CHART APPEARS HERE]

                    1998    1997      1996
International
    &              2,135    2,191    2,142
   U.S.      

Lower U.S. runs reflected divestitures. International runs were higher due to 
improved efficiency.

Marketing & Refining Segment Financial Indicators
- -----------------------------------------------------------------------------
(In millions)                                    1996        1997        1998
- -----------------------------------------------------------------------------
U.S. Income                                   $   407     $   542     $   574
International Income                              506         483         442
- -----------------------------------------------------------------------------
Total Downstream Net Income                   $   913     $ 1,025     $ 1,016
- -----------------------------------------------------------------------------
Revenues(1)                                   $70,796     $55,871     $45,233
- -----------------------------------------------------------------------------
Assets                                        $23,520     $20,212     $18,532
- -----------------------------------------------------------------------------
Capital Expenditures                          $ 1,554     $   928     $   721
Cash Investments in Equity Companies              131         340         268
- -----------------------------------------------------------------------------
Total Investment Spending                     $ 1,685     $ 1,268     $   989
- -----------------------------------------------------------------------------
(1) Includes intersegment revenues.

In 1998, major initiatives resulted in strong Downstream earnings performance,
despite difficult industry conditions in certain markets where Mobil operates.

     In the U.S., record income was attained for the second straight year. In
International, operating earnings in 1998 were the second highest on record.
These earnings performances were achieved as an increase in worldwide trade
sales, benefits from initiatives and improved lube earnings more than offset
slightly lower U.S. industry margins and lower margins in Asia-Pacific and at
the Yanbu, Saudi Arabia, joint venture refinery.

     In the U.S., major initiatives in 1998 included the completion of
construction of sixty On The Run(R) convenience stores and the expansion of the
successful rollout of the Speedpass(TM) program into all of Mobil's major
markets. By year's end, some 2.1 million motorists had the miniature
Speedpass(TM) transponders.

     During 1998, the implementation of the Mobil-British Petroleum (BP)
alliance in Europe was completed and initiatives were fully in place to achieve
targeted annual benefits of about $500 million pretax (Mobil share, about $170
million). These initiatives included sale of the retail fuels assets in Belgium
and Hungary. In addition, as part of a separate initiative to restructure the
lubricant base oil refining business and achieve additional annual benefits of
about $50 million pretax (Mobil share, $25 million) by mid-year 1999, the
stand-alone lubes refinery at Llandarcy in South Wales was closed.

     In the Asia-Pacific region several major cost reduction initiatives were
implemented, including completion of a restructuring in Japan, which included
the elimination of approximately 300 positions, and a cost reduction and asset
rationalization program in the Australian marketing operations. In 1998, Mobil
announced the realignment of its fuels and lubes operations in Australia and New
Zealand.

     In Africa, Mobil continued to build on a strong competitive position by
progressing the market entry in Kenya and the re-entry into the South African
lubes business.

     In Latin America, the company continued to grow in the fuels markets in
Colombia, Peru and Ecuador and entered the fuels market in Venezuela, while
Mobil's lubes business continued to grow throughout the region. In addition, an
initiative was launched late in the year to realign the fuels and lubes
operations in the region.

     Investment spending totaled $1.0 billion in 1998, about 40% in the U.S.,
including spending for construction related to On The Run(R) convenience stores.
The remainder was mainly for asset base protection in international areas.
Planned spending for 1999 is $0.8 billion, down $0.2 billion from 1998, and is
about equally divided between U.S. and International.

     Downstream revenues decreased 19% in 1998 versus 1997 due to lower
petroleum product prices partly offset by the effects of higher sales volumes.
Revenues decreased in 1997 versus 1996 due to the effects of equity accounting
for the Mobil-BP European alliance, partly offset by the effects of higher sales
volumes elsewhere.


18                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------

Petroleum Operations (continued)

     Downstream net income of $1,016 million in 1998 was $9 million lower than
in 1997. Excluding special items, operating earnings of $1,420 million (U.S.
$566 million and International $854 million; refer to tables that follow)
increased $108 million, despite lower overall margins. Higher product trade
sales volumes, benefits from the Mobil-BP European alliance, strong refinery
performance and business initiatives contributed to the higher operating
earnings in 1998.

     Net income of $1,025 million in 1997 was $112 million higher than in 1996.
Excluding special items, operating earnings of $1,312 million increased $261
million. Higher product trade sales volumes outside of Europe, benefits from the
Mobil-BP European alliance and strong refinery performance contributed to higher
earnings in 1997. Additionally, improved integrated margins in the U.S. and
Europe more than offset lower margins in parts of Asia-Pacific.

U.S. Marketing & Refining Earnings

(In millions)                                    1996        1997        1998
- -----------------------------------------------------------------------------
U.S. Income                                   $   407     $   542     $   574
Special Items in Income
  LIFO/other inventory adjustments                 35           8           8
  Asset impairment                                 --         (18)         --
  Employee performance award                       --         (10)         --
- -----------------------------------------------------------------------------
Operating Earnings (Excludes Special items)   $   372     $   562     $   566
- -----------------------------------------------------------------------------


     U.S. Downstream operating earnings were $566 million in 1998, $4 million
higher than in 1997. The unfavorable impact of lower industry margins was offset
by higher product sales volumes and excellent refinery performance. Initiatives
in marketing such as Speedpass(TM) and On The Run(R) contributed to growth in
retail automotive gasoline sales, which were up more than 5%.

In 1997, operating earnings of $562 million were $190 million higher than in
1996. Results benefited from excellent refinery performance, higher integrated
margins and higher product sales volumes, in particular in retail automotive
gasoline sales which were up almost 3%.

International Marketing & Refining Earnings 

(In millions)                                      1996      1997      1998 
- ---------------------------------------------------------------------------
International Income                              $ 506     $ 483     $ 442
Special Items in Income
  Lower of cost or market provisions                 --        --      (261)
  BP alliance implementation costs                   --       (69)      (93)
  Restructuring provisions                         (154)     (189)      (41)
  LIFO/other inventory adjustments                    8        12       (17)
  Employee performance award                         --       (21)       --
  Other                                             (27)       --        --
- ---------------------------------------------------------------------------
Operating Earnings (Excludes Special items)       $ 679     $ 750     $ 854
- ---------------------------------------------------------------------------

     International Downstream operating earnings were $854 million in 1998, $104
million higher than in 1997. Europe reported record results, up significantly
due to benefits from the Mobil-BP alliance and stronger integrated margins.
Earnings were up somewhat in Asia-Pacific, as self-help programs across the
region fully offset the unfavorable impact of lower integrated margins. Africa
also generated record earnings as a result of growth initiatives. International
downstream earnings were also helped by higher product sales volumes in South
America, but were hurt by lower margins at Mobil's Yanbu, Saudi Arabia joint
venture refinery.

     Operating earnings of $750 million in 1997 were $71 million higher than in
1996. In Europe, results improved significantly primarily due to benefits from
the Mobil-BP alliance and stronger integrated margins. These gains were partly
offset by significantly lower margins in parts of Asia-Pacific.

Downstream Petroleum Products Sales Volumes* (Thousands of barrels daily)

[BAR CHART APPEARS HERE]

                            1998     1997     1996

International & U.S.       3,440    3,343    3,345

- -------------------
*Includes supply sales.

Worldwide sales volumes increased by 3% led by the U.S., Africa and Latin 
America.


Mobil                                                                         19
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------


Chemical Earnings 
(Millions of dollars)

[BAR GRAPH APPEARS HERE]

                        1998     1997     1996

Net Income               181      403      306
Operating Earnings       190      350      306


Significantly lower operating earnings in 1998 reflected weaker industry
polyethylene and aromatics margins.

Chemical

Chemical Segment Financial Indicators
- -----------------------------------------------------------------------------
(In millions)                                    1996        1997        1998
- -----------------------------------------------------------------------------
Petrochemicals Income                          $  167      $  214      $   41
Chemical Specialties and OPP Films                139         189         140
- -----------------------------------------------------------------------------
Total Chemical Net Income                      $  306      $  403      $  181
- -----------------------------------------------------------------------------
Revenues(1)                                    $3,280      $3,533      $2,818
- -----------------------------------------------------------------------------
Assets                                         $2,966      $3,088      $3,337
- -----------------------------------------------------------------------------
Capital Expenditures                           $  339      $  323      $  267
Cash Investments in Equity Companies                7          --         101
- -----------------------------------------------------------------------------
Total Investment Spending                      $  346      $  323      $  368
- -----------------------------------------------------------------------------
(1) Includes intersegment revenues 


Chemical income declined significantly reflecting lower polyethylene and
paraxylene margins. However, this unfavorable impact was mitigated somewhat by
record income in the chemical specialties business.

     Chemical is comprised of: petrochemicals, chemical specialties and oriented
polypropylene (OPP) films. Petrochemicals is the largest segment with major
product lines of polyethylene resin, paraxylene, benzene, propylene and ethylene
glycol.

     Chemical is progressing two major international petrochemical projects.
Mobil Yanbu Petrochemical Company and Saudi Basic Industries Corporation expect
to complete by mid-2000 a major expansion that will double the current capacity
of their Yanpet olefins complex in Yanbu, Saudi Arabia. Mobil and Pequiven, the
Venezuelan state-owned petrochemical company, are engaged in Phase 1 engineering
studies to develop construction cost bid specification packages and marketing
and distribution feasibility studies for a proposed new olefins complex in Jose,
Venezuela. The proposed site is at an existing petrochemicals facility, giving
it access to low-cost feedstocks and opportunities to achieve substantial
synergies with the current operations.

     A modernization and expansion of Mobil's Beaumont olefins plant is nearing
completion with start-up slated for early 1999. This project will increase
ethylene capacity by 45%, improve operating flexibility to process the most
economically attractive feedstocks and lower energy consumption by 35%. To
utilize effectively the incremental ethylene output from this project and from
the recently expanded Houston, Texas, olefins plant, a low-cost de-bottleneck of
the Beaumont low-pressure polyethylene plant was completed in late 1998,
resulting in a 10% increase in polyethylene capacity. The plant's capacity is
now 2 billion pounds of polyethylene resin.

     Chemical's investment spending in 1998 was $368 million, slightly higher
than the 1997 level of $323 million due to the ramp-up of the Yanpet expansion
project. Planned investment spending for 1999 is approximately $300 million,
mainly to support continued worldwide productivity improvements and capacity
expansions, notably the Yanpet project.

     Chemical 1998 net income of $181 million included a $9 million writedown of
petrochemical inventory values to reflect their lower market value. Chemical's
1997 income included $53 million from special items consisting of a gain on the
sale of a substantial portion of the European stretch film business and a
favorable patent litigation settlement, partially offset by a charge for the
employee performance award. 

Chemical Earnings 

(In millions)                                        1996     1997      1998
- ---------------------------------------------------------------------------- 
Chemical Income                                     $ 306    $ 403     $ 181
Special Items in Income 
  Lower of cost or market provisions                   --       --        (9)
  Asset sales gains                                    --       48        --
  Litigation                                           --       10        --
  Employee performance award                           --       (5)       --
- ----------------------------------------------------------------------------
Operating Earnings (Excludes Special Items)         $ 306    $ 350     $ 190
- ----------------------------------------------------------------------------

20                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------


Chemical (concluded)

     Chemical operating earnings were $190 million in 1998, down 46% from the
prior year, largely due to significantly weaker global polyethylene and
paraxylene margins. Volumes improved by 4%, which was less than the 14% increase
in 1997, as no major new capacity was streamed until late in the year. While
most industry fundamentals for Chemical's petrochemical and OPP film businesses
were unfavorable in 1998, the effects of these factors were partially offset by
an especially strong result in the chemical specialties business unit.

     Operating earnings of $350 million in 1997, an increase of $44 million or
14% from 1996, reflected stronger polyethylene margins, increased sales volumes,
and improved plant operating reliability.

     Trade sales revenues of $2.4 billion in 1998 decreased 19% from the prior
year primarily due to a similar percentage decrease in U.S. polyethylene prices.
The 5% gain in 1997 trade revenues over 1996 was fueled by a 14% increase in
sales volumes, somewhat offset by lower aromatics prices.

Corporate and Financing

Corporate and Financing Expense 

(In millions)                                     1996       1997       1998
- ----------------------------------------------------------------------------
Corporate and Financing Expense                  $(364)     $(368)     $(137)
Special Items included:
  Settlement of prior years' tax disputes           --         --        137
  Exxon Mobil merger - related costs                --         --        (25)
  Asset sales gains                                 30         39         --
  Litigation                                        --        (31)        --
  Employee performance award                        --         (6)        --
  Staff redesign implementation                    (75)        --         --
- ----------------------------------------------------------------------------
Operating Expense
  (Excludes Special Items)                       $(319)     $(370)     $(249)
- ----------------------------------------------------------------------------


Corporate and Financing net expense was $137 million in 1998. This category
includes corporate administrative expenses, net financing expense, and other
items. Excluding special items from both periods, Corporate and Financing
operating expense of $249 million was $121 million lower than in 1997, primarily
due to the timing of expenses and other one-time items.

     Excluding special items, Corporate and Financing operating expense of $370
million in 1997 was $51 million higher than in 1996, primarily due to a number
of one-time charges that were only partially offset by lower interest expense
due to lower average net debt balances and lower interest rates. The staff
redesign implementation costs in 1996 were expensed as incurred and related
primarily to relocation expenditures, facility modifications and consultant
fees.

Restructurings

In 1998, Mobil implemented new restructuring programs in Australia and New
Zealand, and in Latin America, to integrate regional fuels and lubes operations.
These programs will result in the elimination of approximately 500 positions as
well as asset write-downs in Australia and New Zealand. Mobil recorded a
provision of $50 million ($41 million after tax) in Selling and general expenses
and Depreciation, depletion and amortization for these programs. In 1999, cash
outlays of $36 million will be made for employee separation benefits and exit 
costs. The remainder represents noncash costs for the closure of facilities with
net book values of $19 million. These assets will be closed in 1999. The results
of operations of these assets are not material. Also, since the depreciable
assets were written down to zero, there is no further depreciation expense to be
recorded. Projected annualized benefits are about $40 million after tax and are
expected to be fully achieved by the end of 2000 due primarily to employee and
contractor cost savings as well as marketing effectiveness improvements. The
balance in the reserve at December 31, 1998 was $36 million.

     Also during 1998, Mobil and BP completed the implementation of their
alliance, which combined the companies' European operations in the refining and
marketing of fuels and lubricants. This alliance, with targeted annualized
benefits of $170 million pretax (Mobil share) through manpower reductions,
higher volumes, supply and logistics improvements and system efficiencies,
resulted in the elimination of approximately 2,700 positions from the combined
work forces of the two companies (about 1,000 Mobil positions), the
rationalization of certain fuels marketing assets and the closure of surplus
facilities. During 1996, Mobil established a restructuring provision of $184
million ($145 million after tax), primarily for separation costs related to
workforce reductions,


Mobil                                                                         21
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------

Restructurings (concluded)

facilities closure costs and asset writedowns. Of this amount, $126 million
represented cash expenditures in 1996, 1997 and 1998 and the remainder was for
noncash costs. Implementation of this program began in late 1996 and was
essentially complete as of December 31, 1998. The amounts remaining in the
reserve at December 31, 1996, 1997 and 1998 were $123 million, $47 million and
$7 million, respectively, and the reductions were due to cash outlays and
noncash reclassifications.

     Additionally, in 1997, Mobil and BP announced that the alliance would
implement a major restructuring of its lubricant base oil refining business.
This program will result in the elimination of approximately 460 Mobil positions
and in write-downs and closure of certain facilities and will be completed by
the end of 1999. Mobil recorded reserves in 1997 of $86 million ($82 million
after tax) mainly for employee severance costs associated with workforce
reductions and for write-downs and closure of certain facilities. Cash outlays
are expected to be $66 million of which $31 million was spent during 1998.
Non-cash costs are expected to be $20 million. Projected annualized benefits are
expected to reach $50 million pretax, of which Mobil's share is about $25
million, primarily through manpower reductions. The amounts remaining in the
reserve at December 31, 1997 and 1998 were $66 million and $35 million,
respectively. The reductions were due to cash outlays and noncash 
reclassifications.

     The above provisions were recorded in Income from equity affiliates and
Selling and general expenses.

     In addition to restructuring charges for the Mobil-BP alliance, Mobil
incurred one-time implementation charges in 1997 and 1998 of $69 million after
tax and $93 million after tax, respectively, primarily for the reimaging of
retail outlets and for systems implementation.

     During 1997, Mobil commenced two major cost savings initiatives in
Asia-Pacific--one in Japan in response to the deregulated business environment
and the other in Australia. These programs resulted in the elimination of
approximately 400 positions and the rationalization of certain assets. In 1997,
Mobil recorded reserves of $172 million ($107 million after tax) primarily for
separation costs related to workforce reductions and for closure of certain
facilities. The provisions have been recorded in Selling and general expenses,
Crude oil, products and operating supplies, and expenses, Income from asset
sales, interest and other and Depreciation, depletion and amortization. Cash
outlays are expected to be $113 million of which $8 million and $59 million were
made in 1997 and 1998, respectively. The remainder will be paid in 1999.
Non-cash costs are expected to be $59 million. Projected annualized savings from
these initiatives are expected to approximate $210 million pretax and are
expected to be fully realized by the end of 1999. These savings will come from
manpower reductions, lower transportation expenses and volume growth. The
amounts remaining in the reserves at December 31, 1997 and 1998 were $137
million and $50 million, respectively. The reductions were due to cash outlays 
and noncash reclassifications.

Accounting Standards

In June 1998, Financial Accounting Standard (FAS) 133, Accounting for Derivative
Instruments and Hedging Activities, was issued. Adoption of this standard is
required in the first quarter of 2000. FAS 133 requires that all derivatives be
recognized as either assets or liabilities and measured at fair value. If
certain conditions are met, a derivative may be specifically designated as a
hedge of risk exposure. Mobil is currently reviewing the expected impact of FAS
133, which will depend on the derivatives outstanding when the standard is
adopted and is not expected to be significant. 

Risk Management

Because Mobil operates in the worldwide oil and gas markets and has significant
financing requirements, it has exposure to fluctuations in interest rates,
foreign currency exchange rates and hydrocarbon prices, which can affect the
cost of operating, investing and financing. In order to manage these exposures,
management has established defined benchmarks for hedging in order to 
achieve a desired risk profile for the environment in which Mobil operates and
finances its assets. The management-defined benchmarks are periodically reviewed
and are subject to change. 

Debt-Related Instruments

Mobil has fixed and floating rate U.S. and foreign currency denominated debt.
Mobil's benchmark

22                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Management Discussion and Analysis
- --------------------------------------------------------------------------------


Risk Management (concluded)

for interest rate risk is 100% floating rate. Mobil's benchmark is to fully
hedge exposures to foreign currency rate risk resulting from debt instruments
denominated in a currency other than the functional currency of the borrower or
lender. Mobil uses interest rate swaps, cross-currency interest rate swaps,
futures, forward exchange contracts and option contracts to manage its debt
portfolio toward the established benchmark. These instruments have the effect of
changing the interest rate and/or currency of the original borrowings with the
objective of minimizing Mobil's borrowing costs. At December 31, 1998, Mobil was
primarily exposed to U.S. dollar LIBOR.

Nondebt-Related Foreign Currency Exchange Rate Instruments

Mobil has foreign currency exchange rate risk because it operates in about 140
countries. Mobil's benchmark is to fully hedge identified net exposures to
foreign currency exchange rate risk resulting from transactions in currencies
that are not the functional currency of the affected affiliate. Mobil has
entered into forward exchange contracts and currency option contracts to hedge
U.S. dollar payables for purchases of hydrocarbons, firm commitments for capital
projects, cash returns from net investments in foreign affiliates to be remitted
within the coming year, and certain local currency taxes. At December 31, 1998,
the primary currencies under management include the Canadian dollar and
Norwegian kroner.

Commodity Instruments

Mobil balances its overall crude oil and petroleum product supply and demand,
and manages its current and future price risk by entering into hydrocarbon
futures, forwards, swaps and options in various markets. Mobil's benchmark for
hydrocarbons is the prevailing market price. To achieve this benchmark, Mobil
manages its hydrocarbon price exposure associated with fixed-priced commodity
purchases and sales, and inventory positions that vary from management's defined
sustainable inventory levels, primarily through the use of strategies that
qualify as hedges. However, certain strategies manage risk at a macro level and
do not qualify as hedges. Mobil may take commodity positions based on its views
or expectations of specific hydrocarbon prices or price differentials between
commodity types. Mobil does not hedge oil and gas reserves. At December 31,
1998, Mobil was exposed to the general price levels of broadly traded oil and
gas commodities.

Value at Risk

In its risk management activities, Mobil uses a number of tools to measure and
manage risk, including value at risk models. Mobil measures its value at risk
using statistical techniques that project expected changes in values from market
movements on financial and commodity exposures that vary from management's
defined benchmarks. These benchmarks are established by management and represent
the desired risk profile of the environment in which Mobil operates. Value at
risk is defined as the maximum potential gain or loss in fair value from a
one-day market movement using historical statistical models that would cover
99.7% of all such movements over the last three years measured against the
benchmarks. Value at risk includes those exposures that are being managed. The
value at risk of options is determined by using the forward equivalent of the
underlying exposure. The value at risk amounts as measured against the above
management-defined benchmarks were $4 million for interest rate risk and $8
million for commodity price risk (including trading contracts) at December 31,
1998. The foreign currency exchange rate risk was essentially zero. The average,
high and low value at risk during 1998 was:

Year ended December 31, 1998 

(In millions)                                   Average      High       Low
- ---------------------------------------------------------------------------
Interest rate risk                                  $ 5       $ 9       $ 1
Foreign currency exchange rate risk                   1         4         0
Commodity price risk                                 10        13         6
- ---------------------------------------------------------------------------

The value at risk analysis of commodity price risk includes managed physical
commodities as well as hedging and trading derivatives because Mobil manages
this risk on a combined basis.


Mobil                                                                         23
<PAGE>
 
- --------------------------------------------------------------------------------
Management Discussion and Analysis
- --------------------------------------------------------------------------------

Year 2000 Project

Mobil is engaged in a company-wide effort (Project) to address the issues that
are likely to arise if computer programs and embedded computer chips are unable
to properly recognize dates in and after the year 2000. The Project is focused
on three main areas: the information technology (IT) systems in Mobil's
computers and computer software, including those that are linked to the systems
of third parties; the non-IT systems embedded in equipment that controls or
monitors Mobil's operating assets; and Mobil's business relationships with third
parties (referred to herein as external agents). The thrust of the Project is to
address those of Mobil's IT systems, non-IT systems and relationships with
external agents which Mobil judges to be materially important to Mobil. These
systems or relationships, referred to herein as materially important, are those
whose failure for year 2000 reasons would likely: put the safety of individuals
at risk; lead to damage to property or the environment; put in jeopardy the
value of Mobil's name or intellectual property; or trigger a significant adverse
consequence to Mobil's financial performance or condition. 

     Project work dealing with IT systems and Project work dealing with non-IT
systems has the following three phases: (1) inventory and assessment:
inventorying all of Mobil's systems (including those that are linked to third
parties), identifying those of Mobil's systems that are not year 2000 compliant,
and making judgments as to which of Mobil's systems (both compliant and
non-compliant) would likely be materially important; (2) strategy and planning:
developing strategies and plans for (a) remediating, upgrading or replacing all
non-compliant systems (except those whose failure would, in Mobil's judgment,
have an insignificant impact on Mobil's operations) and (b) testing all systems
judged to be materially important, and estimating the costs of implementing
these strategies and executing these plans; and (3) execution: implementing the
strategies and executing the plans. 

     Project work dealing with relationships with external agents has the
following three phases: (1) inventory and assessment: inventorying Mobil's
relationships with external agents and making judgments as to which of those
relationships would likely be materially important; (2) communication and
evaluation: sending letters and questionnaires to those external agents whose
relationships are judged to be materially important to elicit information about
the plans and actions of those external agents to achieve timely year 2000
readiness, and evaluating the information so obtained; and (3) follow up:
contacting external agents with whom Mobil has already communicated to obtain
further assurance that such external agents will achieve timely year 2000
readiness.

     Additional Project work, discussed below, involves identifying scenarios
involving failures for year 2000 reasons of materially important IT and non-IT
systems or materially important relationships with external agents and
developing contingency plans for mitigating the impact of such failures. 

     The inventory and assessment and the strategy and planning phases of the
work dealing with IT systems are complete. The execution phase of this work
involves both application and infrastructure repair and systems upgrades and
replacements. Application and infrastructure repair involves: the remediation
and testing of non-compliant code; the remediation, replacement and testing of
computing infrastructure and telecommunications devices; and the upgrading and
testing of end user applications. The application and infrastructure repair
work, which is being performed by both Mobil personnel and third parties
specializing in resolving year 2000 issues, is expected to be completed by June
30, 1999, and Mobil estimates that approximately 91% of the projects comprising
this work had been completed as of December 31, 1998. The systems upgrade and
replacement work consists of the implementation of a major integrated enterprise
software system in North America (which would have been implemented regardless
of year 2000 considerations) and numerous other systems. All of this work is
expected to be essentially completed by June 30, 1999. Based on calculations
that reflect successful attainment of milestones, Mobil estimates that
approximately 77% of the major integrated enterprise software system
implementation project had been completed as of December 31, 1998. Mobil
estimates that approximately 63% of the projects comprising the work to upgrade
and replace other systems had been completed as of December 31, 1998. 

     The inventory and assessment phase of the work dealing with non-IT systems
is essentially complete. The strategy and planning phase of this work is
expected to be completed by March 31, 


24                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
Management Discussion and Analysis
- --------------------------------------------------------------------------------

Year 2000 Project (continued)

1999, and Mobil estimates that it was approximately 95% complete as of December
31,1998. The execution phase of this work, much of which is being performed by
the vendors of the products involved, is expected to be completed by June 30,
1999, and Mobil estimates that approximately 26% of the projects comprising this
work had been completed as of December 31, 1998. This brought the percentage of
year 2000 compliant non-IT systems in Mobil's inventory of materially important
non-IT systems to approximately 70% as of that date. 

     The inventory and assessment phase of the work dealing with relationships
with external agents is essentially complete. The communication and evaluation
phase of this work is expected to be completed by March 31, 1999, and Mobil
estimates that approximately 68% of the suppliers whose relationships Mobil
judges to be materially important had been contacted and had responded as of
December 31, 1998. The follow-up phase of this work will be undertaken on a
continuous, ongoing basis through the end of 1999.

Cost

The costs associated with the Project (all on a pre-tax basis) are being spent
over a three-year period. There are two categories of these costs: (1) costs
that are being incurred solely to achieve year 2000 compliance and (2) costs
that are being incurred to install new systems that improve business
functionality and in many cases concurrently provide year 2000 compliance. Mobil
estimates that the costs to be incurred solely to achieve year 2000 compliance
will total approximately $185 million, of which the costs of dealing with IT
systems are expected to be about $168 million and the costs of dealing with
non-IT systems are expected to be about $17 million (the costs of dealing with
relationships with external agents are expected to be minimal). As of December
31, 1998, about $121 million of the total costs estimated to be incurred solely
to achieve year 2000 compliance had been expended. Mobil estimates that the
costs to be incurred for new systems that improve business functionality and in
many cases concurrently provide year 2000 compliance will total approximately
$280 million, and as of December 31, 1998, about $206 million of these costs had
been expended, of which $73 million was expensed as incurred and approximately
$133 million was capitalized. 

     All Project costs are being funded with cash flows from operations. The
$185 million which Mobil estimates will be expended solely to achieve year 2000
compliance represents less than 15% of Mobil's estimated total IT budget for the
period covered by the Project. This entire amount is being expensed as it is
incurred. Of the $280 million which Mobil estimates will be expended on new
systems that improve business functionality and in many cases concurrently
provide year 2000 compliance, approximately $105 million is being expensed as it
is incurred and approximately $175 million is being capitalized.


     As a result of the Project, certain IT projects to improve business
functionality have been reprioritized and accelerated while other such IT
projects have been deferred. As a consequence, expenditures during the period
covered by the Project on IT systems that will improve business functionality
will actually be greater than the expenditures that would have been made on such
systems had there been no Project. Accordingly, the deferral of IT work due to
the Project will not have a material adverse effect on Mobil's results of
operations or financial condition.

Risks and Contingency Plans

The failure or failures for year 2000 reasons of materially important systems or
relationships with external agents could have a material adverse effect on
Mobil's results of operations, liquidity and/or financial condition. For
example, if, for year 2000 reasons, a utility company were to be unable to
supply electricity to a Mobil refinery for an extended period, the refinery
would have to be shut down for that period, which could result in substantial
losses of production, sales and income. Mobil believes that the Project work
described above dealing with materially important IT systems and non-IT systems
will, when completed, serve to reduce very substantially the risk that such
systems will fail for year 2000 reasons. Mobil has no way of ensuring, however,
that external agents whose relationships with Mobil are judged to be materially
important (e.g., utilities, telecommunications providers and transportation
providers) will be timely year 2000 compliant.

     The failure or failures of systems for year 2000 reasons could also give
rise to liability to third parties. Mobil has not yet attempted to assess the
potential for such liability, and hence


Mobil                                                                        25 
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------


Year 2000 Project (concluded)

cannot say whether such liability presents a material risk independent of the
risk that such failure or failures could have a material adverse effect on
Mobil's results of operations, liquidity and/or financial condition.

     To minimize the risks associated with the year 2000 issue referred to in
the second preceding paragraph, Mobil has begun work (1) to identify scenarios
involving possible failures for year 2000 reasons of materially important
systems and relationships with external agents and (2) to develop contingency
plans for mitigating the impact of these scenarios. Mobil operates a portfolio
of diverse businesses which have facilities and operations throughout the world
and are managed regionally. Mobil believes that the most reasonably likely worst
case scenarios, should they occur, will be encountered at facilities or
operations located in one or more of these regions. Accordingly, a risk-based
contingency planning process has been developed for execution by each business
unit in its unique operating environment, focusing on its business-specific
risks. Contingency planning project leaders were trained in the process during
the first six weeks of 1999. The business units will develop and implement
contingency plans with a target completion date of September 30, 1999. Mobil
also plans to adapt its existing crisis response model to encompass failures for
year 2000 reasons of materially important systems or relationships with external
agents.

     The work described in the preceding paragraph will be focused on risks,
scenarios and contingency plans involving materially important systems and
relationships with external agents. There are, however, an almost infinite
number of additional risks which are simply not assessable and for which,
therefore, contingency plans cannot be developed. These are the risks of failure
for year 2000 reasons of one or more systems or relationships with external
agents which, individually, Mobil does not judge to be materially important but
whose failure could trigger a cascade of other failures for year 2000 reasons,
the combination of which could be materially important or could prevent Mobil
from implementing contingency plans it has developed. Such a combination of
failures could also have a material adverse effect on Mobil's results of
operations, liquidity and/or financial condition.

Forward-Looking Statements Relating to the Year 2000 

     The foregoing discussion about the year 2000 issue includes a number of
forward-looking statements, which are based on Mobil's best assumptions and
estimates as of the date hereof. These include, without limitation, statements
concerning: Mobil's estimated timetables for completing the not-yet-completed
phases of the Project work; Mobil's estimates of the percentages of the work
that remains to be performed to complete such phases; Mobil's estimated
timetable for identifying scenarios involving possible failures for year 2000
reasons of materially important systems and relationships with external agents
and the development and implementation of contingency plans for mitigating the
impacts of these scenarios; and Mobil's estimates of the costs of (1) completing
the not-yet-completed phases of the Project and (2) identifying possible year
2000 failure scenarios and developing and implementing contingency plans for
mitigating the impacts of these. 

     Actual results could differ materially from the estimates expressed in such
forward-looking statements, due to a number of factors. These factors, which are
not necessarily all the key factors that could cause such differences, include
the following: Mobil's failure to judge accurately which of Mobil's systems and
relationships with external agents are materially important; Mobil's inability
to obtain and retain the staff and third-party assistance necessary to complete
the not-yet-completed phases of the Project in accordance with Mobil's estimated
timetables; the inability of such staff and third parties (1) to locate and
correct all non-year 2000 compliant computer code in materially important
systems and test such corrected code and (2) to install and test upgrades or new
systems containing year 2000-compliant computer code, all in accordance with
Mobil's estimated timetables; unforeseen costs of completing Project work;
Mobil's inability or failure to identify significant year 2000 issues not now
contemplated; and the failure of external agents to achieve timely year 2000
readiness.


26                                                                        Mobil 
<PAGE>
 
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                      Management Discussion and Analysis
- --------------------------------------------------------------------------------


Environmental Matters

Environmental Expenditures                 U.S.                International 
- --------------------------------------------------------------------------------
(In millions)                      1996   1997   1998       1996   1997   1998 
- --------------------------------------------------------------------------------
Capital                            $149   $105   $ 88       $108   $105   $125
Protection and Compliance                                  
  Ongoing operations                212    213    208        171    128    114
  Remediation                        46     46     45         27     28     22
- --------------------------------------------------------------------------------
Total Environmental Expenditures   $407   $364   $341       $306   $261   $261
- --------------------------------------------------------------------------------

Over the past three years Mobil has spent $1.9 billion to safeguard the
environment.

Mobil's commitment and practice is to conduct its operations
with full concern for safeguarding the environment, employees, customers and the
public--wherever it operates. The company accomplishes this through a
comprehensive corporate policy and management system, innovative technologies,
sharing best practices, extensive training and constant attention to
environmental matters in its day-to-day operations. Environmental expenditures
are a significant cost of doing business, and the U.S. and other countries
continue to impose stringent environmental requirements. While these costs
reflect a downward trend, environmental performance has been improving. Although
Mobil cannot predict accurately how environmental expenditures will affect
future operations and earnings, it expects to continue to incur substantial
costs. Mobil believes its costs will not vary significantly from those of its
competitors. 

     Capital expenditures are additions or modifications to plants and
facilities to limit, monitor and control emissions and waste generation and to
manufacture newly formulated products. The majority of U.S. environmental
capital expenditures have been made to comply with federal and state clean air
and water regulations as well as waste-management requirements. Mobil sells
clean-burning reformulated gasoline in those metropolitan areas designated by
the Environmental Protection Agency (EPA) where Mobil markets gasoline products.
Additional emission reductions are mandated by the year 2000. 

     Internationally, capital expenditures were made in large part to help
protect ground and surface water and to reduce air emissions. Worldwide capital
expenditures for environmental matters in 1999 are expected to remain near the
1998 expenditure level.

     Protection and Compliance expenditures are Mobil's recurring costs
associated with managing hazardous substances, emissions and waste generation in
ongoing operations, and the costs to remediate identified contamination. The
decline in remediation expenditures reflects the use of improved remediation
technology, a more effective use of available resources and a continuing
government/industry trend toward utilizing a risk-based corrective action
approach to remediating subsurface contamination. 

     Like many other companies, Mobil periodically receives notices from the
EPA, or equivalent state agencies, that it has been designated as a potentially
responsible party (PRP) for remediation of hazardous-waste sites. The majority
of these sites are still under investigation by the EPA or the state agencies
concerned. All PRPs are jointly and severally liable under the federal Superfund
law; however, since the early 1980s, Mobil has been successful in sharing
cleanup costs with other financially sound companies. At December 31, 1998,
Mobil had been successful in resolving its involvement in 180 of the 282 sites
where it had been named a PRP. The number of PRP sites does not represent a
relevant measure of liability as each company's involvement in a site can vary
substantially.

     Mobil believes it has provided adequate reserves for known environmental
obligations. However, Mobil may be subject to future environmental remediation
liabilities relating to assets previously sold, closed facilities, requirements
not yet identified or the sale or disposition of operating facilities. While the
amounts could be material to Mobil's earnings in the periods in which such
liabilities arise, the extent of such future remediation requirements and costs
is not subject to reasonable estimation. Based on Mobil's long experience in
managing environmental matters in its businesses, it does not anticipate that
the aggregate level of future remediation costs will increase above recent
levels so as to materially and adversely affect its consolidated financial
position or liquidity. See also Note 11 to Financial Statements on page 46 for
further discussion of environmental liabilities.



Mobil                                                                        27
<PAGE>
 
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Management Discussion and Analysis
- --------------------------------------------------------------------------------


The Euro

On January 1, 1999, eleven European countries established fixed conversion rates
between their existing sovereign currencies ("legacy currencies") and adopted
the euro as their common legal currency. The euro and the legacy currencies are
each legal tender for transactions now. Beginning January 1, 2002, the 
participating countries will issue euro-denominated bills and coins and by July
1, 2002 each will withdraw its sovereign currency and transactions thereafter
will be conducted solely in euros.

     During 1998, Mobil conducted an assessment of the euro's impact on Mobil's
pan-European fuels and lubricants alliance with BP as well as other Mobil
business conducted in Europe and/or transacted in legacy currencies. The
assessment addressed such issues as providing customer assistance, handling
customer transactions in euros and legacy currencies, and modifying systems to
support transactions in euros. As a result of the assessment, plans to address
the impact of the euro's introduction were developed, including plans for:
internal and external communications; training; and systems and process
redevelopments based on evolving business practices of customers, vendors,
employees, banks and public and government institutions. Steps are now being
taken to implement these plans.

     Based upon Mobil's assessment of the impact of the euro on Mobil and the
steps Mobil is taking to deal with this impact, Mobil does not expect that the
introduction of the euro will have a significant negative impact on Mobil's
operations, results of operation, liquidity and/or financial condition. Mobil
estimates that approximately $50 million pretax ($30 million after-tax) will be
spent on euro-related conversion processes from 1998 through 2002. These costs
are being funded with cash flows from operations and substantially all of them
will be expensed as incurred.

     The foregoing discussion about the euro includes several forward-looking
statements, which are based on Mobil's best assumptions and estimates as of the
date hereof. These include, without limitation, statements concerning Mobil's
expectations as to the impact of the euro on Mobil and Mobil's estimate of the
cost of converting to the euro. Actual results, however, could differ materially
from those expressed in such forward-looking statements for a number of reasons,
including without limitation, the following: changes in the form of, and/or the
timetable for or regulatory details relating to the introduction of the euro
from what Mobil has assumed; Mobil's inability to implement in a timely manner
its plans for dealing with the impact of the euro; and the inability or failure
of third parties with whom Mobil has significant euro-based relationships to
convert to the euro on a timely basis.

Forward-Looking Statements 

Written materials issued and oral statements made from time to time by Mobil may
contain "forward-looking statements." Forward-looking statements can be
identified by the fact that they do not relate strictly to historical or current
facts and by their use of words such as "goals," "expects," "plans," "believes,"
"estimates," "forecasts," "projects," "intends" and other words of similar
meaning. Such statements are likely to address Mobil's earnings, return on
capital employed, capital expenditures, debt-to-capitalization ratio, dividend
increases, project implementation, production growth, reserve replacement, sales
growth and expense reductions. They are based on management's then-current
information, assumptions, plans, expectations, estimates and projections about
the petroleum and chemical industries. However, such statements are not
guarantees of future performance, and actual results and outcomes may differ
materially from what is expressed depending on a variety of factors, many of
which are outside Mobil's control. 

     Among the factors that could cause actual outcomes or results to differ
materially from what is expressed in these forward-looking statements are
changes in the demand for, supply of, and market prices of crude oil, refined
products, natural gas and petrochemicals; changes in refining margins and
marketing margins; success in partnering, in implementing oil, natural gas and
petrochemical projects, and in implementing internal plans; reliability of
operating facilities; effects of environmental regulations; success of
commercial negotiations; and domestic and international political and economic
conditions.


28                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------

Quarterly Financial Data (unaudited)

<TABLE> 
<CAPTION> 
                                                                         1997                              
                                            ----------------------------------------------------------
                                                First      Second       Third      Fourth        Full      
(In millions, except per-share amounts)       Quarter     Quarter     Quarter     Quarter        Year  
- ------------------------------------------------------------------------------------------------------
<S>                                          <C>         <C>         <C>         <C>        <C> 
Revenues
  Sales and services                         $ 15,935    $ 16,372    $ 15,950    $ 16,070   $  64,327  
  Income/(loss) from equity affiliates            102         167         143         284         696  
  Income from asset sales,                                                                    
       interest and other                         149         210         304         220         883  
- ------------------------------------------------------------------------------------------------------
Total Revenues                                 16,186      16,749      16,397      16,574      65,906  
- ------------------------------------------------------------------------------------------------------
Costs and Expenses                                                                            
  Crude oil, products and operating                                                           
       supplies and expenses                   10,468      10,531      10,159      10,039      41,197  
  Exploration expenses                             75          82         105         237         499  
  Selling and general expenses                    806       1,136       1,057       1,358       4,357  
  Depreciation, depletion                                                                     
       and amortization                           643         615         590         706       2,554  
  Interest and debt discount expense               98          91         142          97         428  
  Taxes other than income taxes                 2,406       2,706       2,682       2,712      10,506  
  Income taxes                                    864         738         770         721       3,093  
- ------------------------------------------------------------------------------------------------------
Total Costs and Expenses                       15,360      15,899      15,505      15,870      62,634  
- ------------------------------------------------------------------------------------------------------
Net Income/(Loss)                            $    826    $    850    $    892    $    704   $   3,272  
  Per common share                           $   1.03    $   1.06    $   1.12    $   0.88   $    4.10  
  Per common share-assuming dilution         $   1.01    $   1.04    $   1.09    $   0.86   $    4.01  
- ------------------------------------------------------------------------------------------------------
Dividends Per Common Share                   $   0.53    $   0.53    $   0.53    $   0.53   $    2.12  
- ------------------------------------------------------------------------------------------------------
Special Items Included in Net Income                                                          
  Asset impairment                           $     --    $     --    $     --    $    (18)  $     (18) 
  Lower of cost or market provisions               --          --          --          --          --  
  Settlement of prior years' tax disputes          --          --          --          --          --  
  BP alliance implementation costs                (18)        (20)        (11)        (20)        (69) 
  Asset sales gains                                --          --         140          41         181  
  Restructuring provisions                         --          --         (61)       (128)       (189) 
  Federal royalty settlement                       --          --          --          --          --  
  Exxon Mobil merger-related costs                 --          --          --          --          --  
  LIFO/other inventory adjustments                 --          --          --          20          20  
  Employee performance award                       --          --         (50)         --         (50) 
  Litigation                                       --          --         (33)         --         (33) 
- ------------------------------------------------------------------------------------------------------
Total Special Items                               (18)        (20)        (15)       (105)       (158) 
- ------------------------------------------------------------------------------------------------------
Operating Earnings(1)                        $    844    $    870    $    907    $    809   $   3,430  
- ------------------------------------------------------------------------------------------------------
Sales Price per Common Share (2)                                                              
  High                                       $     68    $ 72 1/4    $     78    $ 77 1/2   $      78  
  Low                                        $ 60 5/8    $     60    $ 69 5/8    $66 7/16   $      60  
- ------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>                                                                1998                           
                                            ------------------------------------------------------------
                                                 First      Second       Third      Fourth        Full   
(In millions, except per-share amounts)        Quarter     Quarter     Quarter     Quarter        Year     
- --------------------------------------------------------------------------------------------------------
<S>                                         <C>         <C>         <C>         <C>          <C> 
Revenues                                                                                                   
  Sales and services                        $   13,388  $   13,023   $  12,878    $ 12,851   $  52,140     
  Income/(loss) from equity affiliates             126          55         204         (69)        316     
  Income from asset sales,                                                                               
       interest and other                          116         155         404         400       1,075     
- --------------------------------------------------------------------------------------------------------
Total Revenues                                  13,630      13,233      13,486      13,182      53,531     
- --------------------------------------------------------------------------------------------------------
Costs and Expenses                                                                                         
  Crude oil, products and operating                                                                        
       supplies and expenses                     8,403       8,074       8,261       8,171      32,909     
  Exploration expenses                              74          97         185         287         643     
  Selling and general expenses                     934         939         854       1,028       3,755     
  Depreciation, depletion                                                                                  
       and amortization                            599         621         633         978       2,831     
  Interest and debt discount expense                93          30         227         101         451     
  Taxes other than income taxes                  2,293       2,438       2,486       2,665       9,882     
  Income taxes                                     529         392         331         104       1,356     
- --------------------------------------------------------------------------------------------------------
Total Costs and Expenses                        12,925      12,591      12,977      13,334      51,827     
- --------------------------------------------------------------------------------------------------------
Net Income/(Loss)                           $      705  $      642   $     509    $   (152)  $   1,704     
  Per common share                          $     0.88  $     0.81   $    0.64    $  (0.21)  $    2.12     
  Per common share-assuming dilution        $     0.86  $     0.79   $    0.63    $  (0.21)  $    2.10     
- --------------------------------------------------------------------------------------------------------
Dividends Per Common Share                  $     0.57  $     0.57   $    0.57    $   0.57   $    2.28     
- --------------------------------------------------------------------------------------------------------
Special Items Included in Net Income                                                                       
  Asset impairment                          $       --  $       --   $      --    $   (387)  $    (387)    
  Lower of cost or market provisions                --          --          --        (270)       (270)    
  Settlement of prior years' tax disputes           --          --          --         137         137     
  BP alliance implementation costs                 (10)        (13)        (14)        (56)        (93)    
  Asset sales gains                                 --          --          55          --          55     
  Restructuring provisions                          --          --          --         (41)        (41)    
  Federal royalty settlement                        --          --         (29)         --         (29)    
  Exxon Mobil merger-related costs                  --          --          --         (25)        (25)    
  LIFO/other inventory adjustments                  --          --          --          (9)         (9)    
  Employee performance award                        --          --          --          --          --     
  Litigation                                        --          --          --          --          --     
- --------------------------------------------------------------------------------------------------------
Total Special Items                                (10)        (13)         12        (651)       (662)    
- --------------------------------------------------------------------------------------------------------
Operating Earnings(1)                       $      715  $      655   $     497    $    499   $   2,366     
- --------------------------------------------------------------------------------------------------------
Sales Price per Common Share (2)                                                                           
  High                                      $ 83 13/16  $ 82 13/16   $  80        $ 91 1/4   $ 91  1/4       
  Low                                       $ 63   3/4  $ 73  7/16   $  62 7/16   $ 71       $ 62 7/16       
- --------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  Excludes special items.
(2)  The principal market for trading of Mobil's common stock is the New York
     Stock Exchange. The stock symbol is "MOB." The reported prices represent a
     composite of transactions on the New York Stock Exchange, the Chicago,
     Pacific, Philadelphia, Boston and Cincinnati regional exchanges and the
     over-the-counter market.




Mobil                                                                        29
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------

Return on Average Shareholders' Equity (In percent)

98      9.0
97     17.0
96     16.0  

Return on Average Shareholders' Equity declined with lower earnings, reflecting
the impact of a deterioration in industry fundamentals.


Commentary on Consolidated Statement of Income.


     Revenues from Sales and Services decreased $12,187 million in 1998 from
1997 primarily due to the effects of lower average worldwide crude oil, natural
gas and petroleum product prices. Partly offsetting these decreases were the
effects of higher petroleum sales volumes. The decrease in 1997 from 1996
resulted mainly from the effects of equity accounting for the Mobil-BP European
downstream alliance and the gas marketing activities in the U.S., lower crude
oil prices and currency translation effects, which were partly offset by higher
sales volumes and higher average worldwide natural gas prices.

     Income from Equity Affiliates decreased in 1998 due to significantly lower
crude oil, natural gas and petroleum product prices. The increase in 1997 from
1996 resulted mainly from the affects of the alliances being recorded for the
first full year.

     Total Costs and Expenses decreased by $10,807 million from 1997 mainly due
to the lower average petroleum prices, the effects of equity accounting for the
alliances and the benefits of initiatives. In 1997, the decrease was mainly due
to the effects of equity accounting for the Mobil-BP European downstream and
Mobil-Shell California upstream alliances as well as currency translation
effects.

     Crude Oil, Products and Operating Supplies and Expenses decreased $8,288
million in 1998, primarily due to the lower average petroleum prices. The
decrease in 1997 from 1996 was primarily due to the effects of equity accounting
for the Mobil-BP and Mobil-Shell alliances and lower average costs for crude
oil, partly offset by higher volume-related expenses and increased spending for
growth programs in new venture areas. 

     Exploration Expenses were higher in 1998 due to exploratory well
write-offs, primarily in the U.S. and Latin America. Expenses in 1997 decreased
somewhat from 1996 due to a smaller planned program for that year.

     Selling and General Expenses decreased $602 million primarily due to the
effects of initiatives. In 1997, the decrease was primarily due to the effects
of equity accounting for the Mobil-BP alliance and cost-savings initiatives,
partly offset by restructuring reserves and the employee performance award.

     Depreciation, Depletion and Amortization Expenses were higher in 1998
mainly as a result of asset impairments of upstream properties, primarily in the
U.S., Latin America and Asia-Pacific. Expenses in 1997 decreased from 1996 as
the effects from equity accounting for the Mobil-BP and Mobil-Shell alliances
were largely offset by the effects of 1996's acquisition of Ampolex and other
capital spending.

     Taxes Other than Income Taxes decreased $624 million in 1998, primarily due
to lower import duties and excise and gasoline taxes. In 1997, the decrease of
$8,517 million from 1996 reflected the effects of equity accounting for the
alliances were partly offset by the effects of higher sales volumes.

     Income Taxes decreased significantly as the effects of lower pretax income
were compounded by mix changes in the sources of earnings. Deferred tax assets
related to tax loss carryforwards that were fully reserved were written off in
1998 with no impact on net income. Income Taxes decreased in 1997 versus 1996 as
the effects of higher pretax income were more than offset by mix changes in the
sources of earnings.


Commentary on Consolidated Statement of Changes in Shareholders' Equity
Total Shareholders' Equity fell $1,091 million in 1998 primarily due to an
increase in Common Stock Held in the Treasury from the purchase of 6,468,900
shares in the open market to offset the dilutive effects of stock options and
ongoing market purchases. Also, Unearned Employee Compensation and Benefit Plan
Trust increased due to the reclassification of 7,383,110 common shares held by a
supplemental benefit plan trust. Return on Average Shareholders' Equity
decreased from 17.0% in 1997 to 9.0% in 1998.

     Common stock dividends paid were $1.9625 per share, $2.12 per share and
$2.28 per share in 1996, 1997 and 1998, respectively.


30                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                      Consolidated Financial Statements 
- --------------------------------------------------------------------------------


Consolidated Statement of Income

<TABLE> 
<CAPTION> 

Year ended December 31 (In millions, except per-share amounts)               1996                  1997                   1998
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                   <C>                    <C> 
Revenues                                                                                                
  Sales and services(1)                                                  $ 80,365              $ 64,327               $ 52,140
  Income from equity affiliates                                               279                   696                    316
  Income from asset sales, interest and other                                 859                   883                  1,075
- ------------------------------------------------------------------------------------------------------------------------------
Total Revenues                                                             81,503                65,906                 53,531
- ------------------------------------------------------------------------------------------------------------------------------
Costs and Expenses                                                                                      
  Crude oil, products and operating supplies and expenses                  47,490                41,197                 32,909
  Exploration expenses                                                        512                   499                    643
  Selling and general expenses                                              5,187                 4,357                  3,755
  Depreciation, depletion and amortization                                  2,725                 2,554                  2,831
  Interest and debt discount expense                                          455                   428                    451
  Taxes other than income taxes(1)                                         19,023                10,506                  9,882
  Income taxes                                                              3,147                 3,093                  1,356
- ------------------------------------------------------------------------------------------------------------------------------
Total Costs and Expenses                                                   78,539                62,634                 51,827
- ------------------------------------------------------------------------------------------------------------------------------
Net Income                                                               $  2,964              $  3,272               $  1,704
  Per common share                                                       $   3.69              $   4.10               $   2.12
  Per common share--assuming dilution                                    $   3.62              $   4.01               $   2.10
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

(1) Includes excise and state gasoline taxes: 1996-$9,236 million; 1997-$5,928 
    million; 1998-$5,853 million.

Consolidated Statement of Changes in Shareholders' Equity

<TABLE> 
<CAPTION> 

Year ended December 31 (In millions)                                         1996                  1997                   1998
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                   <C>                    <C> 
Preferred Stock                                                                                         
  -Beginning of year                                                     $    722              $    686               $    665   
  -End of year, after redemptions                                        $    686              $    665               $    641   
- ------------------------------------------------------------------------------------------------------------------------------
Unearned Employee Compensation                                                                                           
  and Benefit Plan Trust                                                                                              
    -Beginning of year                                                   $   (411)             $   (365)              $   (329)  
    -End of year                                                         $   (365)             $   (329)              $   (668)  
- ------------------------------------------------------------------------------------------------------------------------------
Common Stock at Par                                                                                                   
  -Beginning of year                                                     $    888              $    891               $    894   
  -End of year, after issuance of shares                                 $    891              $    894               $    898   
- ------------------------------------------------------------------------------------------------------------------------------
Capital Surplus 
  -Beginning of year                                                     $  1,396              $  1,468               $  1,549   
  -End of year, after issuance of common shares                          $  1,468              $  1,549               $  1,649   
- ------------------------------------------------------------------------------------------------------------------------------
Earnings Retained in the Business 
  -Beginning of year                                                     $ 17,745              $ 19,108               $ 20,661   
  -Net income                                                $  2,964       2,964     $ 3,272     3,272      $ 1,704     1,704
  -Common stock dividends                                                  (1,547)               (1,667)                (1,781) 
  -Preferred stock dividends (ESOP-related)                                   (54)                  (52)                   (50) 
  -End of year                                                           $ 19,108              $ 20,661               $ 20,534  

Accumulated Other Nonowners' Equity                                                                                            
  -Beginning of year                                                     $    (27)             $    (73)              $   (821) 
  -Cumulative minimum pension liability(2)                         --                      --                   (126) 
  -Cumulative foreign currency translation(2)                     (46)        (46)       (748)     (748)        (111)     (237)
                                                                 -----                  ------                 ------
  -End of year                                                           $    (73)             $   (821)              $ (1,058)
- ------------------------------------------------------------------------------------------------------------------------------
Changes in Nonowners' Equity                                 $   2,918                $  2,524               $  1,467
- ------------------------------------------------------------------------------------------------------------------------------
Common Stock Held in Treasury, at Cost
  -Beginning of year                                                     $ (2,362)             $ (2,643)              $ (3,158)
  -End of year, after purchases                                          $ (2,643)             $ (3,158)              $ (3,626)
- ------------------------------------------------------------------------------------------------------------------------------
Total Shareholders' Equity                                               $ 19,072              $ 19,461               $ 18,370
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(2)  Amounts are net of income tax (expense)/benefit: 1996-$(2) million;
     1997-$12 million; 1998-$88 million. 
See Notes to Financial Statements on pages 38-52.


Mobil                                                                         31
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------

             Total Debt 
        (Millions of dollars)
        International  U.S.
     98       7,701
     97       6,664
     96       7,875


Debt increased, primarily reflecting the impact of weaker business conditions on
earnings.

Return on Average Capital Employed 
(In percent)

98      7.7
97     13.4 
96     12.7 

Return on Average Capital Employed declined for the first time in four years due
to the 48% drop in net income.

Commentary on Consolidated Balance Sheet 

Total Current Assets decreased $991 million, primarily reflecting lower Cash,
Accounts and notes receivable and Inventories. 

     Cash and cash equivalents decreased $106 million from 1997. The movements
that contributed to this decrease are presented in the Consolidated Statement of
Cash Flows on page 35. 

     Accounts and notes receivable decreased as a result of reduced revenues
caused by lower worldwide crude oil, petroleum product and natural gas prices.

     Inventories were lower in 1998 also as a result of lower petroleum product
prices. Since these prices were below the book value of certain international
inventories, it was necessary to write down the inventories to amounts that
would be realizable upon future sale. 

     Investments and Long-term Receivables essentially did not change as the
reclassification of a benefit plan trust to shareholders' equity as a result of
a new accounting requirement was primarily offset by additional equity
contributions to several joint ventures. 

     Net Properties, Plants and Equipment increased $171 million to $24,727
million as capital additions were mostly offset by depreciation, the writedown
of certain properties to fair value, the contribution of assets into joint
ventures and asset sales.

     Total Current Liabilities of $12,946 million increased $525 million from
year-end 1997 primarily from increases in Short-term debt partially offset by
decreases in Accounts payable. Short-term debt increased primarily due to a
shift in financing from long-term to commercial paper as well as more long-term
debt maturing in one year at year-end 1998 than year-end 1997. Accounts payable
declined mainly due to the lower crude oil and petroleum product prices in 1998
that also resulted in the lower cost of purchases.

     At year-end 1998, total Debt of Mobil and its consolidated subsidiaries was
$7,701 million, an increase of $1,037 million from the prior year. The addition
from 1997 reflects higher debt levels resulting from the impact of weaker
business conditions and the need to borrow to offset the lower cash generated
from operations. Mobil's year-end debt-to-capitalization ratio was 29%, up from
25% at year-end 1997.

     Mobil continues to have ready access to global financial markets, providing
flexibility to take advantage of investment opportunities and low borrowing
costs. At year-end 1998, Mobil had effective shelf registration statements on
file with the Securities and Exchange Commission (SEC) that would permit the
offer and sale of an aggregate of $1,815 million of debt securities pursuant to
Rule 415 of the Securities Act of 1933. Also in place was a Euro-Medium-Term-
Note program to facilitate the offering and sale outside the U.S. of an
additional $1.7 billion of debt securities in 1999 or later years.

     Total Shareholders' Equity fell $1,091 million (see commentary on
Consolidated Statement of Changes in Shareholders' Equity on page 30).


32                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Consolidated Financial Statements
- --------------------------------------------------------------------------------


Consolidated Balance Sheet

<TABLE> 
<CAPTION> 
At December 31 (In millions)                                                               1997        1998
- -----------------------------------------------------------------------------------------------------------
<S>                                                                                    <C>         <C>  
Assets
Current Assets
  Cash and cash equivalents                                                            $    820    $    714
  Accounts and notes receivable                                                           5,952       5,518
  Inventories                                                                             2,156       1,911
  Prepaid expenses and other current assets                                                 623         520
  Deferred income taxes                                                                     171          68
- -----------------------------------------------------------------------------------------------------------
Total Current Assets                                                                      9,722       8,731
- -----------------------------------------------------------------------------------------------------------
Investments and Long-term Receivables                                                     8,479       8,490
Net Properties, Plants and Equipment                                                     24,556      24,727
Deferred Charges and Other Assets                                                           802         806
- -----------------------------------------------------------------------------------------------------------
Total Assets                                                                           $ 43,559    $ 42,754
- -----------------------------------------------------------------------------------------------------------

Liabilities and Shareholders' Equity
Current Liabilities
  Short-term debt                                                                      $  2,994    $  3,982
  Accounts payable                                                                        4,418       3,707
  Accrued liabilities                                                                     2,794       2,943
  Income, excise, state gasoline and other taxes payable                                  1,906       1,986
  Deferred income taxes                                                                     309         328
- -----------------------------------------------------------------------------------------------------------
Total Current Liabilities                                                                12,421      12,946
- -----------------------------------------------------------------------------------------------------------
Long-term Debt                                                                            3,670       3,719
Reserves for Employee Benefits                                                            1,745       2,060
Accrued Restoration, Removal and Environmental Costs                                      1,072       1,011
Deferred Credits and Other Noncurrent Obligations                                         1,274       1,021
Deferred Income Taxes                                                                     3,535       3,254
Minority Interest in Subsidiary Companies                                                   381         373
- -----------------------------------------------------------------------------------------------------------
Total Liabilities                                                                        24,098      24,384
- -----------------------------------------------------------------------------------------------------------
Shareholders' Equity
  Preferred stock--shares issued and outstanding:
   1997-171,093; 1998-164,986                                                               665         641
  Unearned employee compensation and benefit plan trust                                    (329)       (668)
  Common stock--shares issued: 1997-894,308,872; 1998-897,947,485                           894         898
  Capital surplus                                                                         1,549       1,649
  Earnings retained in the business                                                      20,661      20,534
  Accumulated other nonowners' equity                                                      (821)     (1,058)
  Common stock held in treasury, at cost--shares: 1997-110,945,100; 1998-117,414,000     (3,158)     (3,626)
- -----------------------------------------------------------------------------------------------------------
Total Shareholders' Equity                                                               19,461      18,370
- -----------------------------------------------------------------------------------------------------------
Total Liabilities and Shareholders' Equity                                             $ 43,559    $ 42,754
- -----------------------------------------------------------------------------------------------------------
</TABLE> 
See Notes to Financial Statements on pages 38-52.

Mobil                                                                         33
<PAGE>
 
- --------------------------------------------------------------------------------
                      Management Discussion and Analysis
- --------------------------------------------------------------------------------

                           [BAR CHART APPEARS HERE]

Asset Sales Proceeds 
(Millions of dollars)

98              811
97            1,050
96            1,759

Mobil sells assets that do not fit long-term strategies or are worth more to
others. Proceeds have totaled $3.6 billion over the past three years.

Commentary on Consolidated Statement of Cash Flows

The Statement of Cash Flows summarizes the cash provided and used during the
year. The impact of changes in foreign currency translation rates has been
removed from the amounts reported in this statement. Therefore, except for Cash
and Cash Equivalents, these amounts do not agree with the differences that would
be derived from the changes in Balance Sheet amounts.

     Net Cash from Operating Activities decreased by $1,492 million from 1997.
Net Cash from Operating Activities is derived by adjusting reported Net Income
for charges or credits that have no cash effect and cash items reported
elsewhere in this Statement.

     Net Cash Used in Investing Activities was essentially unchanged, reflecting
a slightly higher investment program partially offset by lower level of proceeds
from asset sales in 1998. Exploration expenses of $512 million, $499 million and
$643 million in 1996, 1997 and 1998, respectively, are included in investing
activities rather than operating activities.

     Net Cash Used in Financing Activities in 1998 was $1,168 million versus
$2,548 million used in financing activities in 1997. The variance reflects
higher debt levels associated with a weaker operating cash flow.

Investment Program

Mobil's planned 1999 investment program, including capital and exploration
expenditures and cash investments in equity companies, totals $4.8 billion.
Spending continues to be directed primarily to international projects
(International-80%; U.S.-20%), where opportunities to find and develop
resources are greater. The 1999 spending program dedicates about three-fourths
of the funds to the upstream sector. This program has been scaled back about 13%
from the 1998 spending level as a result of the current depressed industry
conditions. Mobil will continue to monitor its business environment and remains
flexible to adjust its plans if crude oil prices fail to improve from current
depressed levels or if attractive opportunities arise. Mobil's
debt-to-capitalization ratio of 29% provides the flexibility to weather tough
years, to take advantage of attractive investment opportunities and/or to
increase dividends to shareholders. 

     At year-end 1998, the unspent balance of total appropriations for capital
expenditures was approximately $4.9 billion. Mobil has large unspent balances of
total appropriations for capital expenditures at the end of each year.The
company is not contractually committed to spend all of these appropriations but
generally expects to do so over the next several years.

Asset Impairments

     A charge of $491 million before tax ($387 million after tax) was recorded
to write down certain oil and gas properties to fair value, mainly in the U.S.,
Latin America and Asia Pacific. These write-downs are the result of the
reduction of hydrocarbon reserves, governmental actions and low worldwide prices
caused by the near term excess supply of crude oil and petroleum products.

     The book value of producing properties that are determined to be impaired
are written down to fair value based on the net present value of future cash
flows.  These cash flows are based on prices used for planning purposes
escalated for estimated inflation, applied to the future production profiles of
proved reserves and discounted at the rate that reflects Mobil's minimum return
on projects that are considered for investment.  The reserves considered under
these tests are all currently producing hydrocarbons.

     The assumptions related to fair value of properties are reflective of
Mobil's opinion that, due to the size of the capital projects and the time often
needed to complete them, a long-term view is required.  Mobil believes that over
this long term, its assets will be recoverable in an environment of continued
price volatility, which is influenced by market forces, political and economic
uncertainties, host country regulations and new production sources. In this
highly competitive market, operating assets are rationalized with a long-term
perspective through several strategies including restructurings and joint
ventures.  If the low prices experienced at year-end 1998 are sustained over a
long period of time and cause a revision of the prices that Mobil uses for
planning purposes, there could be future charges to income from the further
write-down of assets.  Operations have not been shut down as a result of short-
term price declines nor are significant shutdowns expected in the future since
prices would need to decline significantly from current levels to be considered
for shut down.

34                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Consolidated Financial Statements
- --------------------------------------------------------------------------------


Consolidated Statement of Cash Flows

<TABLE> 
<CAPTION> 
Year ended December 31 (In millions)                                               1996               1997               1998
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>                <C>                <C> 
Cash Flows from Operating Activities
  Net Income                                                                    $ 2,964            $ 3,272            $ 1,704
  Adjustments to reconcile to net cash from operating activities
    Depreciation, depletion and amortization                                      2,725              2,554              2,831
    Deferred income taxes                                                           446                404               (146)
    Earnings less (greater) than distributions from
      equity affiliates                                                             153                (59)               329
    Exploration expenses (includes noncash charges:
      1996-$36; 1997-$30; 1998-$120)                                                512                499                643
    Gain on sales of properties, plants and equipment
      and other assets                                                             (423)              (389)              (230)
    (Increase) decrease in working capital items (detailed below)                  (290)               475                181
    Other, net                                                                      312                221                173
- -----------------------------------------------------------------------------------------------------------------------------
Net Cash from Operating Activities                                                6,399              6,977              5,485
- -----------------------------------------------------------------------------------------------------------------------------
Cash Flows from Investing Activities
  Capital and exploration expenditures                                           (4,967)            (4,689)            (4,747)
  Acquisition of Ampolex Limited, net of $47 cash acquired                       (1,347)                --                 --
  Proceeds from sales of properties, plants and equipment
    and other assets                                                              1,759              1,050                811
  Payments attributable to investments and
    long-term receivables                                                          (645)(1)           (756)(1)           (456)
- -----------------------------------------------------------------------------------------------------------------------------
Net Cash Used in Investing Activities                                            (5,200)            (4,395)            (4,392)
- -----------------------------------------------------------------------------------------------------------------------------
Cash Flows from Financing Activities
  Cash dividends                                                                 (1,601)            (1,719)            (1,831)
  Proceeds from borrowings having original terms
    greater than three months                                                     1,494                923              1,714
  Repayments of borrowings having original terms
    greater than three months                                                    (1,215)            (1,772)            (1,059)
  Increase in other borrowings                                                      667                112                371
  (Decrease) increase in minority interest                                          (47)               339                  1
  Proceeds from issuance of common stock                                             75                 84                104
  Purchase of common stock for treasury                                            (281)              (515)              (468)
- -----------------------------------------------------------------------------------------------------------------------------
Net Cash Used in Financing Activities                                              (908)            (2,548)            (1,168)
- -----------------------------------------------------------------------------------------------------------------------------
Effect of Exchange Rate Changes on Cash and Cash Equivalents(2)                      19                (22)               (31)
- -----------------------------------------------------------------------------------------------------------------------------
Net Increase (Decrease) in Cash and Cash Equivalents                                310                 12               (106)
Cash and Cash Equivalents--Beginning of Year                                        498                808                820
- -----------------------------------------------------------------------------------------------------------------------------
Cash and Cash Equivalents--End of Year                                          $   808            $   820            $   714
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  Includes the cash expenditure for the acquisition of a 25% interest in a
     joint venture that owns the Tengiz field.

(2)  Cash equivalents are liquid investments convertible to cash and have
     original maturities of three months or less.

<TABLE> 
<S>                                                                             <C>                <C>                <C> 
Changes in Working Capital Items  (Increase) Decrease
- -----------------------------------------------------------------------------------------------------------------------------
  Accounts and notes receivable                                                 $(1,199)           $   834            $   508
  Inventories                                                                        91                (17)               189
  Prepaid expenses and other current assets                                          24                (69)               101
  Accounts payable                                                                  836               (307)              (818)
  Accrued liabilities                                                               (19)               334                134
  Income, excise, state gasoline and other taxes payable                            (23)              (300)                67
- -----------------------------------------------------------------------------------------------------------------------------
(Increase) Decrease in Working Capital Items                                    $  (290)           $   475            $   181
- -----------------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------------
Memo Items
- -----------------------------------------------------------------------------------------------------------------------------
  Cash income taxes paid                                                        $ 2,416            $ 2,687            $ 1,845
  Cash interest paid                                                                458                528                467
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE> 

See Notes to Financial Statements on pages 38-52.


Mobil                                                                         35
<PAGE>
 
- --------------------------------------------------------------------------------
                       Consolidated Financial Statements
- --------------------------------------------------------------------------------


Segment and Geographic Information

<TABLE> 
<CAPTION> 
Year ended December 31 (In millions)                           1996            1997            1998                      
- ---------------------------------------------------------------------------------------------------
<S>                                                        <C>             <C>             <C>                           
Revenues by Segment                                                                                                      
  Exploration & Producing        -- Third Party            $  8,055        $  7,381        $  5,744                      
                                 -- Intersegment              4,786           4,459           2,899                      
  Marketing & Refining           -- Third Party              69,931          55,007          44,701                      
                                 -- Intersegment                865             864             532                      
  Chemical                       -- Third Party               3,023           3,251           2,512                      
                                 -- Intersegment                257             282             306                      
  Corporate and Other                                           494             267             574                      
  Intersegment Elimination                                   (5,908)         (5,605)         (3,737)                     
- ---------------------------------------------------------------------------------------------------
  Total Revenues                                           $ 81,503        $ 65,906        $ 53,531                      
- ---------------------------------------------------------------------------------------------------

Income from Equity Investments by Segment                                                                                
  Exploration & Producing                                  $     75        $    254        $     89                      
  Marketing & Refining                                          126             346             185                      
  Chemical                                                       79              96              42                      
  Corporate and Other                                            (1)             --              --                      
- ---------------------------------------------------------------------------------------------------
  Total Income from Equity Investments                     $    279        $    696        $    316                      
- ---------------------------------------------------------------------------------------------------

Depreciation, Depletion, and Amortization by Segment                                                                     
  Exploration & Producing                                  $  1,596        $  1,557        $  1,886                      
  Marketing & Refining                                          966             835             776                      
  Chemical                                                      126             141             149                      
  Corporate and Other                                            37              21              20                      
- ---------------------------------------------------------------------------------------------------
  Total Depreciation, Depletion, and Amortization          $  2,725        $  2,554        $  2,831                      
- ---------------------------------------------------------------------------------------------------

Income Tax Expense/(Benefit) by Segment                                                                                  
  Exploration & Producing                                  $  2,966        $  2,785        $  1,007                      
  Marketing & Refining                                          425             544             478                      
  Chemical                                                       36              90              17                      
  Corporate and Other                                          (280)           (326)           (146)                     
- --------------------------------------------------------------------------------------------------- 
  Total Income Tax Expense/(Benefit)                       $  3,147        $  3,093        $  1,356                      
- --------------------------------------------------------------------------------------------------- 

Net Income/(Loss) by Segment                                                                                             
  Exploration & Producing        -- U.S.                   $    737        $    697        $     11                      
                                 -- International             1,372           1,515             633                      
  Marketing & Refining           -- U.S.                        407             542             574                      
                                 -- International               506             483             442                      
  Chemical                                                      306             403             181                      
  Corporate and Other                                          (364)           (368)           (137)                     
- ---------------------------------------------------------------------------------------------------
  Total Segment Net Income                                 $  2,964        $  3,272        $  1,704                       
- ---------------------------------------------------------------------------------------------------
</TABLE> 

The distribution of Mobil's operations by business segment and geographic area
is presented above and on page 37. The business segments are based on products
and services and business activities reported to management. Exploration &
Producing explores for, develops and produces crude oil and natural gas, and
extracts natural gas liquids, sulfur and carbon dioxide. Marketing & Refining is
responsible for petroleum refining operations and the marketing of all refined
petroleum products. Chemical manufactures and sells various petroleum-based
chemical products. Corporate and Other includes corporate administrative
expenses and other items.

     Mobil's share of the net income of companies accounted for on the equity
method is included in Revenues. Financial information on these affiliates is
presented in Note 4 on pages 40-41.

     Intersegment revenues are sales to other business segments within Mobil and
are at estimated market prices. These intercompany transactions are eliminated
for consolidation purposes. Income taxes are allocated to segments on the basis
of operating results.

36                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                       Consolidated Financial Statements
- --------------------------------------------------------------------------------

Segment and Geographic Information (concluded)

<TABLE> 
<CAPTION> 
Year ended December 31 (In millions)                                               1996             1997          1998
- ----------------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>              <C>           <C>  
Investment Spending
  Exploration & Producing        -- U.S.                                        $   480          $   427       $   369
                                 -- International                                 3,434(1)         2,461         2,556
  Marketing & Refining           -- U.S.                                            403              357           372
                                 -- International                                 1,151              571           349
  Chemical                       -- U.S.                                            301              288           239
                                 -- International                                    38               35            28
  Corporate and Other                                                                42               51           191
- ----------------------------------------------------------------------------------------------------------------------
  Total Capital Expenditures                                                    $ 5,849          $ 4,190       $ 4,104
- ----------------------------------------------------------------------------------------------------------------------
  Exploration Expenses           -- U.S.                                             76               76           127
                                 -- International                                   436              423           516
- ----------------------------------------------------------------------------------------------------------------------
  Total Exploration Expenses                                                        512              499           643
- ----------------------------------------------------------------------------------------------------------------------
  Total Capital Expenditures and Exploration Expenses                           $ 6,361          $ 4,689       $ 4,747
- ----------------------------------------------------------------------------------------------------------------------
  Cash Investments in Equity Companies                                              658              617           753
- ---------------------------------------------------------------------------------------------------------------------- 
  Total Investment Spending(2)                                                  $ 7,019          $ 5,306       $ 5,500
- ---------------------------------------------------------------------------------------------------------------------- 

Investment in Equity Method Affiliates by Segment
  Exploration & Producing                                                       $ 1,448          $ 2,211       $ 2,847
  Marketing & Refining                                                            1,471            4,173         3,952
  Chemical                                                                          502              579           684
  Corporate and Other                                                                --               --            --
- ----------------------------------------------------------------------------------------------------------------------  
  Total Investment in Equity Method Affiliates                                  $ 3,421          $ 6,963       $ 7,483
- ----------------------------------------------------------------------------------------------------------------------   
Total Assets by Segment
  Exploration & Producing                                                       $17,880          $18,468       $19,671
  Marketing & Refining                                                           23,520           20,212        18,532
  Chemical                                                                        2,966            3,088         3,337
  Corporate and Other                                                             2,042            1,791         1,214
- ----------------------------------------------------------------------------------------------------------------------
  Total Assets by Segment                                                       $46,408          $43,559       $42,754
- ----------------------------------------------------------------------------------------------------------------------

Revenues by Geographic Area
  United States                                                                 $27,447          $28,563       $23,807
  Europe                                                                         25,414            7,684         5,156
  Asia-Pacific                                                                   17,690           17,075        13,454
  Other Areas(3)                                                                 10,458           12,317        10,540
  Corporate and Other                                                               494              267           574
- ----------------------------------------------------------------------------------------------------------------------
  Total Revenues                                                                $81,503          $65,906       $53,531
- ----------------------------------------------------------------------------------------------------------------------

Long-Lived Assets by Geographic Areas
  United States                                                                 $10,522          $ 9,034       $ 8,165
  Europe                                                                          5,183            3,415         3,734
  Asia-Pacific                                                                    6,336            5,714         5,660
  Other Areas                                                                     5,088            6,065         6,711
  Corporate and Other                                                               350              328           457
- ----------------------------------------------------------------------------------------------------------------------
  Total Long-Lived Assets                                                       $27,479          $24,556       $24,727
- ----------------------------------------------------------------------------------------------------------------------
</TABLE> 

(1)  Includes $1,394 million for the acquisition of Ampolex.
(2)  For purposes of the Consolidated Statement of Cash Flows, these exploration
     expenses of $512 million, $499 million and $643 million in 1996, 1997
     and 1998, respectively, are included in investing activities rather than
     operating activities.
(3)  Includes principally West Africa, Saudi Arabia, Canada and Kazakhstan.

[BAR CHART APPEARS HERE]

Investment Spending
(Millions of dollars)

        Capital Expenditures,    
        Exploration Expenses 
        & Equity Investment
98             5,500
97             5,306
96             7,019

76% of Mobil's Investment Spending in 1998 was in the international area where
greater opportunities exist.

Mobil                                                                         37
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------
1. Major Accounting Policies
   
Principles of Consolidation 

The consolidated financial statements include the accounts of companies owned
more than 50% and controlled by Mobil. Significant investments in affiliated
companies owned 50% or less, or where Mobil does not have control, are accounted
for on the equity basis. Investments in other companies in which Mobil owns less
than a majority interest are stated at cost less applicable reserves.
Investments that represent direct interests in the assets, liabilities and
operations of ventures are reported as Mobil's share of each account in the
venture. Intercompany transactions are eliminated.

Use of Estimates

The financial statements, which are prepared in conformity with generally
accepted accounting principles, include amounts that are based, in part, on
management's best estimates and judgments.

Revenues 

Revenues associated with sales of crude oil, natural gas, petroleum and chemical
products and other merchandise are recorded when title passes to the customer.

     Revenues from the production of natural gas properties in which Mobil has 
interests with other companies are recognized on the basis of sales to Mobil 
customers. Differences between these sales and Mobil's share of production are 
routinely adjusted. These differences are not significant.

Inventories

Substantially all crude oil and product inventory volumes are valued at cost
under the last-in, first-out (LIFO) method. Other inventories, primarily
materials and supplies, are valued generally at average cost.

Oil and Gas Accounting

Mobil follows the successful efforts method of accounting for oil and gas
exploration and producing activities. Under this method, direct acquisition
costs of unproved mineral rights are capitalized. Payments made in lieu of
drilling on nonproducing leaseholds are charged to expense currently. Geological
and geophysical costs are charged to expense as incurred. Costs of all
development wells and of exploratory wells that result in additions to proved
reserves are capitalized. Costs of exploratory wells are capitalized if oil and
gas reserves are found and either classified as proved within a year following
completion of drilling or if additional exploration work is underway or planned.
Annual evaluations are made to assure that these conditions are met; otherwise,
the costs of exploratory wells are charged to expense. 

Depreciation, Depletion and Amortization 

     Annual charges to income for depreciation are computed on a straight-line
basis over the useful lives of the assets. Costs of producing properties are
generally accumulated by field. Depletion of these costs and amortization of
capitalized, intangible drilling costs are calculated on a unit-of-production
basis.

     Capitalized acquisition costs of significant unproved mineral rights are
assessed periodically on a property-by-property basis to determine whether their
values have been impaired; where impairment is indicated, a loss is recognized.
Capitalized acquisition costs of other unproved mineral rights are amortized
over the expected holding period. When a mineral right is surrendered, any
unamortized cost is charged to expense. When a property is determined to contain
proved reserves, the mineral right then becomes subject to depletion on a
unit-of-production basis. When assets that are part of a composite group are
retired, sold, abandoned or otherwise disposed of, the cost is charged against
accumulated depreciation, depletion and amortization. Where depreciation is
accumulated for specific assets, gains or losses on disposal are included in
income currently. 

     Capitalized costs of producing properties are assessed when changes in
economic or operating conditions indicate that the carrying amount may not be
recoverable. If the book values of the producing properties exceed undiscounted
cash flows, then the book values are written down to the net present value of
future cash flows. The net present value of future cash flows are based on
prices used for planning purposes escalated for estimated inflation, applied to
future production profiles of proved reserves, and discounted at the rate that
reflects the minimum return on projects that are considered for investments. The
future production of proved undeveloped reserves and their related development
costs are also factored

38                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

1. Major Accounting Policies (continued)

into the cash flows.

Restoration, Removal and Environmental Liabilities

The estimated costs of restoration and removal of major producing facilities are
accrued on a unit-of-production basis over the life of the property. The
estimated future costs for known environmental remediation requirements are
accrued when it is probable that a liability has been incurred and the amount of
remediation costs can be reasonably estimated. These amounts are the
undiscounted, future estimated costs under existing regulatory requirements and
using existing technology.
Derivative Financial Instruments
Mobil uses derivative instruments primarily for purposes of hedging its exposure
to fluctuations in interest rates, foreign currency exchange rates and
hydrocarbon prices. Gains and losses on hedging contracts are recognized
concurrent with the recognition of the economic impact of the underlying
exposures using either the accrual or deferral method of accounting. In order to
qualify for hedge accounting, the derivative instrument must be designated and
effective as a hedge.

     To a lesser extent, Mobil uses derivative commodity instruments, including
swaps, futures, forwards and options, for trading purposes. Gains and losses on
these trading contracts are recognized immediately in earnings. 

     The accrual method is used for interest rate swaps, cross-currency interest
rate swaps and commodity swaps. Under the accrual method, differentials in the
swapped amounts are recorded as adjustments of the underlying periodic cash
flows that are being hedged. Interest differentials paid or received on interest
rate swaps and cross-currency interest rate swaps are reported as accrued
interest receivable or payable, and interest expense is recognized over the life
of the contracts using the adjusted effective yield of the underlying debt.
Price differentials paid or received on commodity swaps are accrued and are
recognized when the price exposure on the physical movement ends and is recorded
in Sales and Services or in Crude Oil, Products and Operating Supplies and
Expenses. 

     The deferral method is used for futures exchange contracts, forward
contracts, commodity swaps and covered options. Premiums or discounts are
amortized over the life of the contract for interest rate and foreign exchange
contracts and are recognized when realized for commodity instruments. Gains and
losses resulting from changes in value of derivative instruments are deferred
and recognized in the same period as the gains and losses of the items being
hedged. Gains and losses on contracts related to debt principal and current
interest are recorded in interest expense; gains and losses related to future
period interest, firm commitments and forecasted transactions are deferred and
are recognized in the measurement of the future period interest, firm
commitments or forecasted transactions; and gains or losses on contracts that
hedge the foreign currency exchange rate risk of net investments are recorded in
Accumulated Other Nonowners' Equity, net of related taxes. 

     Under both the accrual and deferral method of accounting, gains and losses
on closed contracts are deferred and amortized over the original life of the
terminated contract. In the event the hedged item matures, is sold, or is
terminated or the anticipated transaction is no longer expected to occur, the
realized and unrealized gains and losses are recognized in income coincidental
with the transaction, and the derivative would be redesignated as trading. 

     For options, the portion of the premium related to time value is amortized
over the life of the option, and intrinsic value is recognized in income
concurrent with the underlying item being hedged. In all portfolios, the options
are carried at fair value. 

     Cash flow from derivative instruments that qualify for hedge accounting is
included in the same category for cash flow purposes as the item being hedged.
Foreign Currency Translation 
The functional currency for most foreign operations is the local currency. The
cumulative effects of translating the balance sheet accounts from the functional
currency into the U.S. dollar at current exchange rates are included in the
Accumulated Other Nonowners' Equity account in Shareholders' Equity. The U.S.
dollar is used as the functional currency for operations in highly inflationary
foreign economies, in Singapore which is predominantly export-


Mobil                                                                         39
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

1. Major Accounting Policies (concluded)

oriented and for exploration and producing operations in Indonesia, Nigeria,
Equatorial Guinea and Australia. For all operations, gains or losses from
remeasuring foreign currency transactions into the functional currency are
included in income.

Net Income Per Share

Net Income per common share is net income less preferred stock dividends divided
by the weighted average number of common shares outstanding. Net Income per
common share assuming dilution includes the dilutive effects of stock options
and convertible preferred stock.

2. Asset Impairments

As a result of lower worldwide crude oil and natural gas prices, a charge of
$325 million before tax ($270 million after tax) was recorded in Crude oil,
products and operating supplies and expenses to adjust certain inventories to
their market value. 

     Also as a result of lower worldwide prices, a charge of $491 million before
tax ($387 million after tax) was recorded to write down certain properties to
fair value, mainly in the U.S., Latin America and Asia-Pacific. Of this amount,
$352 million was recorded in Depreciation, depletion and amortization with the
remainder recorded primarily in Crude oil, products and operating supplies and
expenses and Exploration expenses. The writedown of producing properties is
determined by comparing their book values to their undiscounted future cash
flows. Where the book values are greater than these cash flows, the properties
are written down to fair value measured by calculating the net present value of
the future cash flows in accordance with the policy described on page 38. There
were no fixed price forward sales of production at December 31, 1998. In 1998,
the price assumptions used to calculate these cash flows in accordance with the
policy in Note 1 are higher than the statutorily mandated prices used on page
59, which are unescalated year-end prices.

3. Inventories

At December 31, 1998, the worldwide excess of market over book value of
inventories valued under the LIFO method was $569 million ($517 million--U.S.;
$5 million--Europe; $5 million--Asia-Pacific; and $42 million--Other Areas). At
December 31, 1997, the worldwide excess of market over book value of inventories
valued under the LIFO method was $1,048 million.

     The lower of cost or market test is measured, and the results are
recognized separately, on a country-by-country basis, and any resulting
write-downs to market, if required, are recorded as permanent adjustments to the
cost of inventories.

Inventories (In millions) 

At December 31                                           1997          1998 
- --------------------------------------------------------------------------------
Crude oil and petroleum products                       $1,535        $1,298 
Chemical products                                         253           247 
Other, mainly materials and supplies                      368           366 
- --------------------------------------------------------------------------------
Total                                                  $2,156        $1,911 
- --------------------------------------------------------------------------------


4. Summary Financial Information of Unconsolidated Equity Affiliates

Summary financial information for affiliated companies accounted for on the
equity method is shown in the table on page 41. Mobil's investment in these
companies is included in Investments and Long-term Receivables. The equity
affiliates are primarily engaged in producing, refining and marketing in Europe,
the Middle East, Kazakhstan, Japan and elsewhere in the Asia-Pacific region,
North American gas marketing, crude oil production and refining in the U.S. and
petrochemical and lubes manufacturing in the Middle East. Also included are
interests in several pipeline ventures.

     Undistributed earnings of the equity affiliates included in Earnings
Retained in the Business were $814 million at December 31, 1998. Distributions
received from these companies were $432 million in 1996, $637 million in 1997
and $645 million in 1998.

     Accounts and Notes Receivable in the Consolidated Balance Sheet include
$271 million and $258 million at December 31, 1997 and 1998, respectively, of
amounts due from equity affiliates. Accounts Payable include $468 million and
$388 million at December 31, 1997 and 1998, respectively, of amounts due to
equity affiliates.


40                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------


4. Summary Financial Information of Unconsolidated Equity Affiliates (concluded)

<TABLE> 
<CAPTION> 

Equity method affiliates (In millions)                   

                               1996                     1997                    1998     
- -------------------------------------------------------------------------------------------------
                           Total  Mobil Share    Total     Mobil Share    Total     Mobil Share
- -------------------------------------------------------------------------------------------------
<S>                     <C>          <C>          <C>      <C>            <C>       <C>  
Current assets          $  9,784     $  3,237     $ 16,281     $  5,626     $ 18,470     $  6,049
Noncurrent assets         16,224        5,260       28,271        9,132       30,175        9,693
Current liabilities       (9,817)      (3,354)     (15,580)      (5,353)     (16,909)      (5,531)
Long-term debt            (4,455)      (1,117)      (6,193)      (1,588)      (7,763)      (1,854)
Other liabilities         (2,064)        (605)      (3,028)        (854)      (2,234)        (874)
- -------------------------------------------------------------------------------------------------
Net assets              $  9,672     $  3,421     $ 19,751     $  6,963     $ 21,739     $  7,483
- -------------------------------------------------------------------------------------------------
Gross revenues          $ 32,296     $ 10,337     $ 72,725     $ 22,706     $ 65,549     $ 20,225
- -------------------------------------------------------------------------------------------------
Income before taxes     $  1,307     $    429     $  2,319     $    834     $    931     $    386
Net income                   969          279        1,782          696          693          316
- -------------------------------------------------------------------------------------------------
Capital expenditures    $  2,044     $    435     $  3,842     $    988     $  2,755     $    776
- -------------------------------------------------------------------------------------------------
</TABLE> 

5. Properties, Plants and Equipment

Properties, plants and equipment are stated at cost, less accumulated
depreciation, depletion and amortization of $25,074 million at December 31,
1997, and $23,954 million at December 31, 1998.

<TABLE> 
<CAPTION> 
Properties, plants and equipment (In millions)                       
                                     1997                       1998 
- --------------------------------------------------------------------------------
At December 31                  Net        Gross          Net         Gross 
- --------------------------------------------------------------------------------
<S>                           <C>          <C>          <C>          <C>   
Petroleum Operations
 Exploration & Producing      $13,810      $29,672      $14,307      $29,282
 Marketing                      4,155        6,225        4,147        6,425
 Refining                       3,624        7,764        3,153        6,888
 Other Marketing &
  Refining Activities             899        2,358          793        2,125
Chemical                        1,740        3,077        1,870        3,349
Corporate and Other               328          534          457          612
- --------------------------------------------------------------------------------
Total                         $24,556      $49,630      $24,727      $48,681
- --------------------------------------------------------------------------------
</TABLE> 

6. Leases

Mobil leases real estate, service stations, pipelines, tankers and other
equipment through noncancelable capital and operating leases. 


     Contingent lease rentals for operating and capital leases are determined
generally by volumetric measurement or sales revenue. Some rental agreements
contain escalation provisions that may require higher, future rent payments.
Mobil does not expect that such rent increases, if any, will have a material
effect on future earnings.

Rental expense (In millions) 

Year ended December 31                            1996         1997         1998
- --------------------------------------------------------------------------------
Minimum rentals                                 $1,260       $1,093       $  993
Contingent rentals                                  55           81           90
- --------------------------------------------------------------------------------
Total                                            1,315        1,174        1,083
Less: sublease rental income                       188          137          132
- --------------------------------------------------------------------------------
Net rental expense                              $1,127       $1,037       $  951
- --------------------------------------------------------------------------------

Mobil                                                                         41
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------


6. Leases (concluded)

Future minimum lease payments have not been reduced by future minimum sublease
rentals of $41 million under operating leases. Capital leases included in Net
Properties, Plants and Equipment were $301 million at December 31, 1997, and
$248 million at December 31, 1998.


Future minimum lease payments under noncancelable leases (In millions) 

At December 31, 1998               Operating Leases    Capital Lease Obligations
- --------------------------------------------------------------------------------
1999                                         $  252                       $   85
2000                                            216                           27
2001                                            173                           21
2002                                            154                           22
2003                                            124                           30
Later years                                   1,330                          257
- --------------------------------------------------------------------------------
Future minimum lease payments                $2,249                       $  442
- --------------------------------------------------------------------------------
Less: executory costs                                                          1
      interest                                                               152
- --------------------------------------------------------------------------------
Total capital lease                                                            
  obligations                                                                289
Less: short-term portion of                                                    
  capital lease obligations                                                   56
- --------------------------------------------------------------------------------
Long-term portion of                                                        
  capital lease obligations                                                $ 233
- --------------------------------------------------------------------------------

7. Short-term Debt

At December 31, 1998, Mobil had $622 million of unused short-term lines of
credit supporting commercial paper borrowing arrangements. A total of $369
million of these unused lines is subject to annual commitment fees. Interest on
borrowings under these lines is based on the London Interbank Offered Rate, the
Domestic Certificate of Deposit Rate or a specified prime rate, as selected from
time to time by Mobil.

<TABLE> 
<CAPTION> 

Short-term debt (In millions)        1997                         1998    
- --------------------------------------------------------------------------------------
At December 31                 Amount  Interest Rate(1)    Amount     Interest Rate(1)
- --------------------------------------------------------------------------------------
<S>                            <C>     <C>                 <C>        <C> 
Notes and loans payable                                                 
  Commercial paper             $1,097       5 7/8%         $2,011           5%
  Banks and Other               1,168       7 1/8%            951           7 1/8%
- --------------------------------------------------------------------------------------
Total notes and loans payable   2,265                       2,962
- --------------------------------------------------------------------------------------
Long-term debt maturing                                                 
  within one year                 729                       1,020
- --------------------------------------------------------------------------------------
Total short-term debt          $2,994                     $ 3,982 
- --------------------------------------------------------------------------------------
</TABLE> 
(1)  Percentages shown in the table are weighted average interest rates at the
     end of the year.


42                                                                       Mobil
<PAGE>
 
- --------------------------------------------------------------------------------

                         Notes to Financial Statements

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

8. Long-term Debt

The table below summarizes Mobil's consolidated Long-term Debt. A significant
portion of this debt is issued by subsidiaries and is guaranteed by Mobil.

     At year-end 1998, Mobil had shelf registrations on file with the SEC that
would permit the offer and sale of $1,815 million of debt securities.
Additionally, at December 31, 1998, the ESOP Trust had a shelf registration on
file with the SEC permitting the offer and sale of $25 million of debt
securities, guaranteed by Mobil. A new shelf registration permitting the offer
and sale of an additional $475 million of debt securities by the ESOP Trust,
guaranteed by Mobil, is expected to be declared effective by the SEC during the
first quarter of 1999. The proceeds of any additional debt securities issued by
the ESOP Trust would be used to refund its existing indebtedness. Also at
year-end 1998, a shelf registration allowing the issuance of U.S. $1.7 billion
of Euro-Medium-Term Notes was in place.

     Long-term debt that becomes due during the next five years is: 1999-$1,020
million; 2000-$365 million; 2001-$386 million; 2002-$136 million, and 2003-$721
million.

Long-term debt (In millions) 

At December 31                                        1997           1998
- -------------------------------------------------------------------------
6 3/8% notes due 1998                                $ 200          $  -- 
7 1/4% notes due 1999(1)                               148            148(2) 
8 5/8% notes due 2006                                  250            250 
7 5/8% debentures due 2033(1)                          216            216(2)
8% debentures due 2032(1)                              164            164(2) 
8 1/8% Canadian dollar Eurobonds due 1998              111             --
 (swapped into 6.8% U.S. $ debt)  
3% Swiss franc debentures due 2003                      --            133
 (swapped into floating rate U.S. $ debt) 
3% Swiss franc debentures due 2003                      --            197 
 (swapped into floating rate U.S. $ debt) 
5% U.S. dollar Eurobonds due 2004                       --            300 
 (swapped into floating rate) 
8 3/8% notes due 2001(1)                               180            180(2) 
8 5/8% debentures due 2021(1)                          250            250 
9 5/8% U.K. sterling Eurobonds due 1999                182            182
7.33% debentures due 2009(1)                            --            100 
7.90% debentures due 2020(1)                            --            175 
U.S. dollar Euro Medium-Term Notes due 1999             --            150 
 (swapped into floating rate Japanese yen) 
Japanese yen loans due 2003-2005 (2.2%)(1) (3)         347            252 
ESOP Trust debentures/notes due 1999-2004 
  (7.6%)(1)(3)                                         497            472
Variable rate project financing due 1998 
  (6.6%)(3)                                             52             -- 
Industrial revenue bonds due 2003-2033 
  (5.6%)(1) (3)                                        484            477 
Other foreign currencies due 1998-2030 
  (5.8%)(1) (3)                                        764            565 
Other due 1998-2054 (7.1%)(3)                          219            239 
Capital lease obligations                              335            289
- -------------------------------------------------------------------------
Total                                                4,399          4,739 
Less: long-term debt maturing within one year          729          1,020 
- -------------------------------------------------------------------------
Total long-term debt                                $3,670         $3,719 
- -------------------------------------------------------------------------
(1)  Swapped principally into floating rate debt.
(2)  Net of repurchases. 
(3)  The percentages shown in parentheses in the table are weighted average
     interest rates at December 31, 1998.

Mobil                                                                       43
<PAGE>
 
- --------------------------------------------------------------------------------

                         Notes to Financial Statements

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

9. Financial Instruments and Risk Management

Mobil uses derivative financial instruments to manage risks resulting from
fluctuations in underlying interest rates, foreign currency exchange rates and
hydrocarbon prices. Because Mobil operates in the international oil and gas
markets and has significant financing requirements, it has exposure to these
risks, which can affect the cost of operating, investing and financing.
Derivative instruments creating essentially equal and offsetting market
exposures are used to help manage these risks. Derivative financial instruments
held by Mobil are not leveraged and are principally held for purposes other than
trading. For additional information regarding Mobil's risk management
activities, please refer to Management's Discussion and Analysis on pages 22 and
23.

     The notional principal amounts of derivative financial instruments at
December 31, are as follows:

At December 31 (In millions)                       1997            1998 
- -----------------------------------------------------------------------
Debt-related instruments                         $4,444          $4,812  
Nondebt-related foreign currency
  exchange rate instruments                       9,706           6,760
Commodity financial instruments 
  requiring cash settlement                       2,438           3,869
- -----------------------------------------------------------------------

     The fair value of Mobil's debt portfolio was $6,464 million ($6,524 million
debt less $60 million derivatives) at December 31, 1997 and $7,622 million
($7,751 million debt less $129 million derivatives) at December 31, 1998. These
fair values were greater than the carrying values by $166 million and $210
million at December 31, 1997 and 1998, respectively. This change was due to a
small decrease in long-term interest rates. The fair value of all other
financial instruments approximated their carrying value.

     In addition to creating market risks that offset the risks associated with
the underlying business exposures, derivative instruments also give rise to
credit risk due to possible nonperformance by counter-parties. However, through
its ongoing control procedures, Mobil monitors the creditworthiness of its
counter-parties and its existing exposures to them under the derivative
instruments. Any potential loss due to credit risk is not expected to be
material.

10. Taxes

<TABLE> 
<CAPTION> 

Total taxes (In millions)                    1996                            1997                                1998
- -----------------------------------------------------------------------------------------------------------------------------------
Year ended December 31             U.S.    Foreign      Total      U.S.   Foreign         Total       U.S.     Foreign        Total
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                              <C>       <C>        <C>        <C>       <C>          <C>        <C>         <C>         <C> 
Excise and state gasoline        $4,207    $ 5,029    $ 9,236    $4,458    $1,470       $ 5,928    $ 4,712     $ 1,141     $  5,853
Import duties                        --      9,130      9,130        --     4,027         4,027         --       3,541        3,541
Property, production, payroll                                                                                            
  and other                         385        272        657       347       204           551        329         159          488
- -----------------------------------------------------------------------------------------------------------------------------------
Total other than income taxes     4,592     14,431     19,023     4,805     5,701(1)     10,506      5,041       4,841        9,882
- -----------------------------------------------------------------------------------------------------------------------------------
Income taxes                                                                                                             
  U.S. state and local               63         --         63        45        --            45         26          --           26
  U.S. federal and foreign                                                                                               
    -current                        217      2,421      2,638       208     2,436         2,644        368       1,108        1,476
    -deferred                       163        283        446       250       154           404       (124)        (22)        (146)

- -----------------------------------------------------------------------------------------------------------------------------------
Total income taxes                  443      2,704      3,147       503     2,590         3,093        270       1,086        1,356
- -----------------------------------------------------------------------------------------------------------------------------------
Total taxes                      $5,035    $17,135    $22,170    $5,308    $8,291       $13,599    $ 5,311     $ 5,927     $ 11,238
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  The change from 1996 primarily reflects the impact of equity accounting for
     Mobil's European downstream alliance with BP.

44                                                                       Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

10.  Taxes  (concluded)

Income from U.S. operations before income taxes was $1,939 million in 1996,
$2,187 million in 1997 and $940 in 1998. Income from foreign operations before
income taxes for the same three years was $4,816 million, $4,872 million and
$2,403 million, respectively. The loss from Corporate and Financing before
income taxes for the same three years was $644 million, $694 million and $283
million, respectively.

     Deferred income taxes are provided for the temporary differences between
the financial statement and tax bases of Mobil's assets and liabilities, and
relate primarily to depreciation, intangible drilling costs, and provisions for
restoration, removal and environmental costs, and employee benefits. Mobil does
not provide deferred taxes for amounts that could result from the remittance of
undistributed earnings of foreign affiliates since it is generally Mobil's
intention to continue reinvesting these earnings indefinitely. Mobil's share of
the undistributed earnings of consolidated subsidiaries and equity method
affiliates, which could be subject to additional income taxes if remitted, was
approximately $3.8 billion at December 31, 1998. If such dividends were to be
remitted, foreign tax credits available under present law would reduce the
amount of U.S. taxes payable. Deferred tax assets in the amount of $43 million
related to tax loss carryforwards that were fully reserved and cannot be
utilized were written off in 1998.

Deferred  taxes (In millions) 

At December 31                                           1997(1)        1998 
- ----------------------------------------------------------------------------
Deferred tax liabilities
  Depreciation, depletion 
    and amortization                                   $4,877         $4,715
  Other                                                   406            549
- ----------------------------------------------------------------------------
Total deferred tax liabilities                          5,283          5,264
- ----------------------------------------------------------------------------
Deferred tax assets
  Book reserves                                         1,544          1,636
  Tax credits available for carry-forward 
    (primarily without expiration)                        693            722
- ----------------------------------------------------------------------------
Total deferred tax assets                               2,237          2,358
- ----------------------------------------------------------------------------
Valuation allowance                                      (627)          (608)
- ----------------------------------------------------------------------------
Net deferred tax liabilities                           $3,673         $3,514
- ----------------------------------------------------------------------------
(1) Prior year data reclassified to conform with current year presentation.

<TABLE> 
<CAPTION> 

Reconciliation of U.S. statutory
  rate to actual tax rate (In millions)    1996                    1997                         1998
- ------------------------------------------------------------------------------------------------------------
Year ended December 31            Amount           %      Amount             %       Amount                %
- ------------------------------------------------------------------------------------------------------------
<S>                               <C>           <C>       <C>            <C>         <C>               <C>  
Income before taxes               $6,111        100.0     $6,365         100.0       $3,060            100.0
- ------------------------------------------------------------------------------------------------------------
Theoretical tax at U.S. rate       2,139         35.0      2,228          35.0        1,071             35.0
Foreign taxes in excess of
  U.S. statutory rate              1,108         18.1      1,151          18.1          475             15.5
Other items, net                    (100)        (1.6)      (286)         (4.5)        (190)            (6.2)
- ------------------------------------------------------------------------------------------------------------
Total income taxes                $3,147         51.5     $3,093          48.6       $1,356             44.3
- ------------------------------------------------------------------------------------------------------------
</TABLE> 


Mobil                                                                         45
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

11. Restoration, Removal and Environmental Liabilities

Exploration and producing properties must generally be restored to their
original condition when the oil or gas reserves are depleted and/or operations
cease. At December 31, 1997 and 1998, $780 million and $760 million,
respectively, had been accrued for restoration and removal costs, mainly related
to offshore producing facilities.

     Mobil accrues for its best estimate of the future costs associated with
known environmental remediation requirements at its service stations, marketing
terminals, refineries and plants, and at certain Superfund sites. At December
31, 1997 and 1998, the accumulated reserve for environmental remediation costs
was $372 million and $328 million, respectively. Of these amounts, $80 million
and $77 million were included in current accrued liabilities in the Consolidated
Balance Sheet. Amounts accrued with respect to Superfund waste disposal sites
are based on the company's best estimate of its portion of the costs of
remediating such sites. These amounts are not material.

12.  Research Expense

Research expenses were $206 million in 1996, $234 million in 1997 and $204
million in 1998.

13. Accumulated Other Nonowners' Equity 

Accumulated Other Nonowners' Equity consists of cumulative minimum pension
liability adjustment and cumulative foreign exchange translation adjustment.
There were no balances for cumulative minimum pension liability adjustment in
1996 and 1997. The amount in 1998 was an unrecognized loss of $126 million, net
of tax. The cumulative foreign exchange translation adjustment is composed of
the following:

Cumulative foreign exchange
   translation adjustment (In millions)

At December 31                                     1996      1997         1998
- ------------------------------------------------------------------------------
Properties, plants 
   and equipment, net                            $  (27)    $(940)     $(1,076)
Deferred income taxes                              (256)     (103)         (83)
Working capital, debt                                                 
   and other items, net                             210       222          227
- ------------------------------------------------------------------------------
Total                                            $  (73)    $(821)(1)  $  (932)
- ------------------------------------------------------------------------------
(1)  The change in 1998 from 1997 reflects the strengthening U.S. dollar
     relative to local currencies in certain countries in which the company has
     significant operations. 

     Foreign exchange transaction losses of $21 million in 1996, $52 million in
1997 and $53 million in 1998 have been included in income.

14.  Restructurings

In 1998, Mobil implemented new restructuring programs in Australia and New
Zealand, and in Latin America, to integrate regional fuels and lubes operations.
These programs will result in the elimination of approximately 500 positions as
well as asset write-downs in Australia and New Zealand.  Mobil recorded a
provision of $50 million ($41 million after tax) in Selling and general expenses
and Depreciation, depletion and amortization for these programs.  In 1999, cash
outlays of $36 million will be made for employee separation benefits and exit
costs.  The remainder represents noncash costs for the closure of facilities
with net book values of $19 million.  These assets will be closed in 1999.  The
results of operations of these assets are not material.  Also, since the
depreciable assets were written down to zero, there is no further depreciation
expense to be recorded.  The balance in the reserve at December 31, 1998 was $36
million.
     Also during 1998, Mobil and BP completed the implementation of their
alliance, which combined the companies' European operations in the refining and
marketing of fuels and lubricants.  This alliance resulted in the elimination of
approximately 2,700 positions from the combined work forces of the two companies
(about 1,000 Mobil positions), the rationalization of certain fuels marketing
assets and the closure of surplus facilities.  During 1996, Mobil established a
restructuring provision of $184 million ($145 million after tax), primarily for
separation costs related to workforce reductions, facilities closure costs and
asset write-downs.  Of this amount, $126 million represented cash expenditures
in 1996, 1997 and 1998 and the remainder was for noncash costs.  Implementation
of this program began in late 1996 and was essentially complete as of December
31, 1998.  The amounts remaining in the reserve at December 31, 1996, 1997 and
1998 were $123 million, $47 million and $7 million, respectively, and the
reductions were due to cash outlays and noncash reclassifications.
     Additionally, in 1997, Mobil and BP announced that the alliance would
implement a major restructuring of its lubricant base oil refining business.
This program will result in the elimina-

46                                                                       Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
     Notes to Financial Statements
- --------------------------------------------------------------------------------

14.  Restructurings (concluded)

tion of approximately 460 Mobil positions and in write-downs and closure of
certain facilities and will be completed by the end of 1999.  Mobil recorded
reserves in 1997 of $86 million ($82 million after tax) mainly for employee
severance costs associated with workforce reductions and for write-downs and
closure of certain facilities.  Cash outlays are expected to be $66 million of
which $31 million was spent during 1998.  Noncash costs are expected to be $20
million.  The amounts remaining in the reserve at December 31, 1997 and 1998
were $66 million and $35 million, respectively.  The reductions were due to cash
outlays and noncash reclassifications.

   The above provisions were recorded in Income from equity affiliates and
Selling and general expenses.

   In addition to restructuring charges for the Mobil-BP alliance, Mobil
incurred one-time implementation charges in 1997 and 1998 of $69 million after
tax and $93 million after tax, respectively, primarily for the reimaging of
retail outlets and for systems implementation.

   During 1997, Mobil commenced two major cost savings initiatives in Asia-
Pacific--one in Japan in response to the deregulated business environment and
the other in Australia.  These programs resulted in the elimination of
approximately 400 positions and the rationalization of certain assets.  In 1997,
Mobil recorded reserves of $172 million ($107 million after tax) primarily for
separation costs related to workforce reductions and for closure of certain
facilities.  The provisions have been recorded in Selling and general expenses,
Crude oil, products and operating supplies, and expenses, Income from asset
sales, interest and other and Depreciation, depletion and amortization.  Cash
outlays are expected to be $113 million of which $8 million and $59 million were
made in 1997 and 1998, respectively.  The remainder will be paid in 1999.  Non-
cash costs are expected to be $59 million.  The amounts remaining in the
reserves at December 31, 1997 and 1998 were $137 million and $50 million,
respectively.  The reductions were due to cash outlays and noncash
reclassifications.

   The Mobil employee positions eliminated under the 1996 and 1997 programs
approximated the workforce reductions included in the original estimates.

15. Employee Stock Ownership Plan (ESOP)

Mobil Oil's Employees Savings Plan includes an ESOP covering most U.S.
employees. In 1989 the ESOP Trust borrowed $800 million and used the proceeds to
buy shares of Series B ESOP Convertible Preferred Stock. Each preferred share
has a liquidation value of $3,887.50, is convertible into 100 shares of common
stock and is entitled to 100 votes. Dividends on the preferred stock are
cumulative and payable at an annual rate of $300 per share. The ESOP Trust uses
the preferred dividends not allocated to employees to make principal and
interest payments on the notes. As debt service exceeds the dividends, Mobil is
required to fund the excess. In 1996, 1997 and 1998, this excess was $47
million, $21 million and $15 million, respectively. The guaranteed ESOP
borrowing is included in Mobil's debt. The future compensation to be earned by
employees is classified in Shareholders' Equity. These amounts are reduced and
expense is recognized as the debt is repaid and shares are earned by employees.
In 1996, 1997 and 1998, total ESOP-related expenses were $49 million, $24
million and $29 million, respectively. Interest incurred on ESOP debt in 1996,
1997 and 1998 was $48 million, $43 million and $38 million, respectively.

16. Employee Benefits

Employee benefits that Mobil provides in the U.S. are contributory and
noncontributory medical and dental plans, pension plans, group life insurance,
savings plans, an employee stock ownership plan, disability plans for sickness
and accidents, and termination plans. Mobil's international affiliates also
provide various pension and other employee benefit plans. Mobil makes
contributions to funded plans and provides book reserves for unfunded plans.

     Mobil also provides certain postretirement health care and life insurance
benefits for most U.S. retirees, if they are working for the company when they
become eligible for retirement. Premium costs are shared on a plan-by-plan basis
between Mobil and the participants. Postretirement health care benefits are
provided both before and after eligibility for Medicare. The life insurance
plans provide for a single lump-sum payment to a designated beneficiary. The
amount of the lump-sum payment varies depending on employment date, age and
years since retirement. There is no 

Mobil                                                                        47
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

16. Employee Benefits (continued)

material obligation for Mobil to provide postretirement benefits for
international retirees because they are covered primarily by local government
programs.

     The charge to Mobil's income for U.S. postretirement health care and life
insurance plans was $64 million in 1996, $63 million in 1997 and $63 million in
1998.

     The components of Mobil's net postretirement benefit expense for U.S. plans
and the status of Mobil's U.S. postretirement benefit plans and the amounts
recognized in the Consolidated Balance Sheet are detailed below.

     The majority of full-time U.S. employees are covered by funded
noncontributory pension plans. These plans are primarily final average pay
plans. Mobil's funding for these plans is based on the projected unit credit
actuarial cost method.

     Mobil's international employees are covered by pension and similar plans.
Coverage and benefits vary from country to country. Mobil's funding policy also
varies, in line with local commercial, actuarial and taxation practices.

     The worldwide charge to Mobil's income for pension plans was $242 million
in 1996, $189 million in 1997 and $140 million in 1998.

     The components of net pension expense for Mobil's plans and the status of
Mobil's pension plans and the amounts recognized in the Consolidated Balance
Sheet are detailed on page 49.

<TABLE> 
<CAPTION> 

Postretirement benefit expense, excluding pensions (In millions)        Health Care                           Life Insurance
- ------------------------------------------------------------------------------------------------------------------------------------
Year ended December 31                                      1996          1997          1998          1996         1997         1998
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>           <C>           <C>           <C>          <C>          <C> 
Service cost                                                $ 10          $  8          $  7          $  2         $  1         $  1
Interest cost                                                 27            31            31            26           24           25
Amortization of unrecognized amounts:
  Prior service cost                                          (1)           (1)           (1)           --           --           --
- ------------------------------------------------------------------------------------------------------------------------------------
Net periodic benefit cost                                   $ 36          $ 38          $ 37          $ 28         $ 25         $ 26
- ------------------------------------------------------------------------------------------------------------------------------------

Status of postretirement benefit plans (In millions)                              Health Care                    Life Insurance
- ------------------------------------------------------------------------------------------------------------------------------------
At December 31                                                                1997           1998             1997            1998
- ------------------------------------------------------------------------------------------------------------------------------------
Change in benefit obligations
  Benefit obligations at beginning of year                                    $ 448           $ 463           $ 354           $ 371
  Service and interest cost                                                      39              38              25              26
  Benefits paid                                                                 (31)            (33)            (21)            (26)
  Plan amendments                                                                 7              (4)             --              (2)
  Actuarial losses and other items                                               --              18              13              24
- ------------------------------------------------------------------------------------------------------------------------------------
Benefit obligations at end of year                                            $ 463           $ 482           $ 371           $ 393
- ------------------------------------------------------------------------------------------------------------------------------------
Book reserves                                                                 $ 464           $ 468           $ 363           $ 360
- ------------------------------------------------------------------------------------------------------------------------------------
Book reserves greater (less) than
  accumulated postretirement benefit obligations                              $   1           $ (14)          $  (8)          $ (33)
- ------------------------------------------------------------------------------------------------------------------------------------
Consisting of:
Unrecognized prior service cost                                               $   2           $   5           $  --           $   2
Unrecognized net (loss)                                                          (1)            (19)             (8)            (35)
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE> 
The discount rate used in determining the postretirement benefit obligation was
7.0% in 1997 and 6.5% in 1998.

     For measurement purposes, a 7.5% annual rate in the per capita cost of
covered health care benefits was assumed for 1999. The rate was assumed to
decrease gradually to 5.0% for 2005 and remain at that level thereafter.

     Assumed health care cost trend rates have a significant effect on the
amounts reported for health care plans. A one-percentage-point change in assumed
health care cost trend rates would have the following effects:

(in millions)                                      1% Increase     1% Decrease
- --------------------------------------------------------------------------------
Effect on total service and interest cost components    $ 5           $ (4)
Effect on postretirement benefit obligations             44            (43)    
- --------------------------------------------------------------------------------

48                                                                      Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

16. Employee Benefits (concluded)

<TABLE> 
<CAPTION> 

Pension expense (In millions)                                               U.S. Plans                     International Plans
- ------------------------------------------------------------------------------------------------------------------------------------
Year ended December 31                                             1996        1997        1998        1996        1997        1998
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                               <C>         <C>         <C>         <C>         <C>         <C> 
Service cost                                                      $  92       $  72       $  81       $  84       $  85       $  83
Interest cost on projected benefit obligations                      185         181         188         128         119         120
Expected return on plan assets                                     (240)       (238)       (264)        (77)        (78)        (79)
Amortization of previously unrecognized amounts:
   Transitional (asset) obligation                                  (30)        (30)        (30)          8           6           5
   Prior service cost                                                19          21          24          39          11          13
   Actuarial (gains) losses                                          (5)         (5)         (7)          5           6           6
Curtailment and settlement losses                                    --          --          --          34          39          --
- ------------------------------------------------------------------------------------------------------------------------------------
Net periodic benefit cost (income) after
  curtailments and settlements                                    $  21       $   1       $  (8)      $ 221       $ 188       $ 148
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION> 
Status of pension plans (In millions)                                                 U.S. Plans                International Plans
- ------------------------------------------------------------------------------------------------------------------------------------
At December 31                                                                    1997           1998           1997           1998
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                            <C>            <C>            <C>            <C> 
Change in projected benefit obligations
  Projected benefit obligations at beginning of year                           $ 2,570        $ 2,751        $ 2,246        $ 2,117
  Service and interest cost                                                        253            269            204            203
  Benefits paid                                                                   (225)          (304)          (207)          (164)
  Plan amendments                                                                   26             62              8             28
  Curtailments, settlements and special termination benefits                        --             --             10             --
  Effects of foreign currency exchange rates                                        --             --           (203)            47
  Actuarial losses and other items                                                 127            319             59            353
- ------------------------------------------------------------------------------------------------------------------------------------
Projected benefit obligations at end of year                                   $ 2,751        $ 3,097        $ 2,117        $ 2,584
- ------------------------------------------------------------------------------------------------------------------------------------
Change in plan assets
  Fair value of plan assets at beginning of year                               $ 2,750        $ 3,007        $ 1,145        $ 1,158
  Actual return on plan assets                                                     451            233            147            105
  Employer contributions                                                            --             --             60             50
  Employee contributions                                                            --             --             10              8
  Benefits paid                                                                   (194)          (270)          (108)           (84)
  Reclassification of supplemental benefit plan trust                               --           (580)            --             --
  Effects of foreign currency exchange rates                                        --             --            (96)            (6)
- ------------------------------------------------------------------------------------------------------------------------------------
Fair value of plan assets at end of year                                       $ 3,007        $ 2,390        $ 1,158        $ 1,231
Book reserves                                                                      146            440            996          1,170
- ------------------------------------------------------------------------------------------------------------------------------------
Fair value of plan assets and book reserves                                    $ 3,153        $ 2,830        $ 2,154        $ 2,401
- ------------------------------------------------------------------------------------------------------------------------------------
Plan assets and book reserves greater (less)
  than projected benefit obligations                                           $   402        $  (267)       $    37        $  (183)
- ------------------------------------------------------------------------------------------------------------------------------------
Consisting of:
  Unrecognized transition asset (obligation)                                   $   120        $    90        $   (18)       $   (14)
  Unrecognized prior service cost                                                 (183)          (221)           (21)           (32)
  Unrecognized net gain (loss)                                                     282           (266)          (137)          (458)
  Pre-funded expenses and intangible assets                                        183             89            213            142
  Accumulated other nonowners' equity                                               --             41             --            179
- ------------------------------------------------------------------------------------------------------------------------------------
Plan assets and book reserves greater (less)
  than projected benefit obligations                                           $   402        $  (267)       $    37        $  (183)
- ------------------------------------------------------------------------------------------------------------------------------------
Weighted average rates used in determining
  the actuarial present value of the
  projected benefit obligations (percent)
  Discount rate                                                                    7.0            6.5            6.5            5.1
  Rate of increase in future compensation levels                                   4.0            4.0            5.1            4.2
Expected long-term rate of return on plan assets
  used in determining current year expense (percent)                               9.0            9.5            8.2            8.0
- ------------------------------------------------------------------------------------------------------------------------------------
Memo: assets and book reserves greater than
  accumulated benefit obligations                                              $   842        $   209        $   392        $   157
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

Pension Plan Assets and Book Reserves exceeded Accumulated Benefit Obligations
by $366 million at the end of 1998.

Mobil                                                                         49
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

17. Stock-Based Compensation Plans

Under the 1995 Mobil Incentive Compensation and Stock Ownership Plan (the Plan)
approved by shareholders, options may be granted to key employees to purchase
annually a maximum of 0.9% of the total common shares outstanding at the end of
the year preceding each year of its five-year life (less the number of shares of
restricted stock granted and the number of equivalent share units allotted as
long-term incentive awards under the Plan), cumulative from the effective date
of the Plan. No additional options may be granted under earlier plans. Stock
options have a maximum term of 10 years, are granted at 100% of the fair market
value of Mobil common stock at the time of the award, and may be exercised to
purchase stock after vesting requirements have been met. Stock appreciation
rights (SARs), where applicable, permit the holder to receive stock, cash or a
combination thereof equal to the amount by which the fair market value at the
time of relinquishment of the option exceeds the option price.

     Based on the December 31, 1998, number of shares outstanding, there were
16,267,543 shares or share units available for option grants and other awards
referred to above in 1998. Based on the December 31, 1997, number of shares
outstanding, there were 13,739,652 shares or share units available for option
grants and other awards referred to above in 1997.

<TABLE> 
<CAPTION> 

Stock option transactions                                         1986 Plan                 1991 Plan                  1995 Plan 
- ------------------------------------------------------------------------------------------------------------------------------------
                                                               Shares   Weighted         Shares   Weighted         Shares   Weighted
                                                                         Average                   Average                   Average
                                                                           Price                     Price                     Price
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                        <C>            <C>        <C>          <C>           <C>         <C>  
January 1, 1996-shares under option                         6,708,652     $26.94     16,380,822     $35.23      5,340,460     $43.68
- ------------------------------------------------------------------------------------------------------------------------------------
Changes during 1996
  Options granted                                                                                               4,475,700      57.50
  Options expired or canceled                                  (1,000)     14.39        (44,700)     43.03       (103,500)     51.79
  Options exercised                                        (1,793,004)     24.68     (1,431,478)     34.10       (117,820)     43.66
  SARs exercised                                              (82,888)     31.32        (56,892)     31.03
- ------------------------------------------------------------------------------------------------------------------------------------
December 31, 1996-shares under option                       4,831,760     $27.71     14,847,752     $35.34      9,594,840     $50.04
- ------------------------------------------------------------------------------------------------------------------------------------
Changes during 1997
  Options granted                                                                                               4,679,600      61.83
  Options expired or canceled                                                           (34,500)     43.03       (270,200)     58.33
  Options exercised                                        (1,555,129)     26.51     (1,579,144)     34.21       (180,148)     46.27
  SARs exercised                                              (16,752)     30.78        (97,836)     30.88
- ------------------------------------------------------------------------------------------------------------------------------------
December 31, 1997-shares under option                       3,259,879     $28.26     13,136,272     $35.48     13,824,092     $53.91
- ------------------------------------------------------------------------------------------------------------------------------------
Changes during 1998
  Options granted                                                                                               4,440,200      71.22
  Options expired or canceled                                  (1,000)     22.09           (900)     43.03       (126,300)     66.11
  Options exercised                                        (1,381,745)     26.48     (1,633,652)     36.23       (635,035)     44.85
  SARs exercised                                                                        (48,582)     31.47
- ------------------------------------------------------------------------------------------------------------------------------------
December 31, 1998-shares under option                       1,877,134     $29.57     11,453,138     $35.39     17,502,957     $58.55
  Weighted average contractual life (years)                      0.91                      3.91                      7.50
  Range of exercise price                                $22.09-32.13              $30.72-43.03              $43.66-71.22
- ------------------------------------------------------------------------------------------------------------------------------------
Options exercisable at December 31, 1996                    4,831,760     $27.71     12,884,752     $34.16      1,219,540     $44.37
- ------------------------------------------------------------------------------------------------------------------------------------
Options exercisable at December 31, 1997                    3,259,879     $28.26     13,136,272     $35.48      2,034,292     $47.63
- ------------------------------------------------------------------------------------------------------------------------------------
Options exercisable at December 31, 1998                    1,877,134     $29.57     11,453,138     $35.39      5,480,157     $46.70
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

50                                                                    Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

17. Stock-Based Compensation Plans (concluded)  

If compensation expense had been recorded using the fair value of the options at
the date of grant, net income would have been reduced by $19 million, $29
million and $33 million in 1996, 1997 and 1998, respectively. Fair value is
determined using a modified Black-Scholes model. The assumptions used in the
model were a dividend yield of 3.2%, a five year zero-coupon risk free interest
rate of 5.66%, estimated volatility of 18% and a five year expected option term.

18. Capital Stock

At December 31, 1998, 1,200,000,000 shares of $1.00 par value common stock were
authorized and 897,947,485 shares were issued, including 117,414,000 shares held
in the treasury.

     At December 31, 1998, 30,000,000 shares of $1.00 par value preferred stock
were authorized, of which 6,000,000 shares of Series A Junior Participating
Preferred Stock were authorized for issuance upon exercise of certain preferred
stock purchase rights (no shares issued or outstanding) and 191,062 shares of
Series B ESOP Convertible Preferred Stock were authorized for issuance. At
December 31, 1997 and 1998, respectively, 171,093 and 164,986 shares of Series B
ESOP Convertible Preferred Stock were outstanding. During 1997 and 1998, 5,243
and 6,107 of such shares, respectively, were redeemed.

     Effective May 20, 1997, Mobil increased the authorized shares of common
stock from 600,000,000 to 1,200,000,000 and recorded a two-for-one stock split
of the Company's issued common stock. In addition, a special distribution of
Series B ESOP Convertible Preferred Stock was made, doubling the number of
shares of that stock outstanding, and the liquidation value, conversion price
and dividend rate of each share were halved.

<TABLE> 
<CAPTION> 

Changes in shares of common stock outstanding 
- -----------------------------------------------------------------------------------------------------
Year ended December 31                                          1996              1997           1998 
- -----------------------------------------------------------------------------------------------------
<S>                                                      <C>               <C>            <C> 
Common shares outstanding-beginning of year              789,119,762       787,588,910    783,363,772 
Purchase of common stock for treasury                     (4,795,400)       (7,458,400)    (6,468,900) 
Exercise of stock options and stock appreciation rights    3,199,632         3,177,748      3,603,113
Incentive compensation awards and restricted stock            64,916            55,514         35,500 
- -----------------------------------------------------------------------------------------------------
Common shares outstanding - end of year                  787,588,910       783,363,772    780,533,485
- -----------------------------------------------------------------------------------------------------
</TABLE> 

Mobil                                                                        51
<PAGE>
 
- --------------------------------------------------------------------------------
                         Notes to Financial Statements
- --------------------------------------------------------------------------------

19. Net Income per Share 

The following table sets forth the computation of basic and diluted earnings per
share:

<TABLE> 
<CAPTION> 

Net income per share
- ------------------------------------------------------------------------------------------------------------------------
Millions of dollars except per share amounts; number of shares in thousands             1996         1997           1998 
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                  <C>          <C>            <C> 
Net income                                                                           $ 2,964      $ 3,272        $ 1,704
Less: dividends on preferred stock                                                        54           52             50 
- ------------------------------------------------------------------------------------------------------------------------
Adjusted net income applicable to common shares                                      $ 2,910      $ 3,220        $ 1,654
- ------------------------------------------------------------------------------------------------------------------------
Weighted average number of basic common shares outstanding                           788,292      786,294        779,231(1) 
- ------------------------------------------------------------------------------------------------------------------------
Net income per common share                                                           $ 3.69       $ 4.10         $ 2.12 
- ------------------------------------------------------------------------------------------------------------------------
Net income                                                                           $ 2,964      $ 3,272        $ 1,704
Less: additional contribution to ESOP                                                     10            8              6
Less: Stock Appreciation Rights compensation income/(expense)                              4           (4)             1
- ------------------------------------------------------------------------------------------------------------------------
Adjusted net income applicable to common shares                                      $ 2,950      $ 3,268        $ 1,697 
- ------------------------------------------------------------------------------------------------------------------------
Weighted average number of basic common shares outstanding                           788,292      786,294        779,231 
Issuable on assumed exercise of stock options                                          9,418       11,445         11,253 
Assumed conversion of preferred stock                                                 18,038       17,318         16,790 
- ------------------------------------------------------------------------------------------------------------------------
Total                                                                                815,748      815,057        807,274(1)
- ------------------------------------------------------------------------------------------------------------------------
Net income per common share--assuming dilution                                        $ 3.62       $ 4.01         $ 2.10 
- ------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1) Excludes, on a weighted average basis, shares held by the benefit plan trust
that are accounted for in a manner similar to treasury stock.

20. Commitments and Contingent Liabilities

Substantial commitments are made in the normal course of business for the
purchase of crude oil and petroleum products, and the acquisition or
construction of properties, plants and equipment (including tankers for time
charter to Mobil).

     Mobil has guaranteed $198 million of the obligations of others, excluding
$223 million of certain cross-guarantees, primarily foreign customs duties, made
with other responsible companies in the ordinary course of business. Mobil has
also indirectly guaranteed repayment of approximately $500 million of debt
issued by companies in which Mobil has an interest in the event projects
financed with that debt are not completed as specified in the project completion
guarantee agreements. In addition, Mobil has guaranteed specified revenues from
crude oil, product and carbon dioxide shipments under agreements with pipeline
companies in which it holds stock interests. If these companies are unable to
meet certain obligations, Mobil may be required to advance funds against future
transportation charges. No material loss is anticipated under these guarantees.

     Mobil and its subsidiaries are engaged in various litigations and have a
number of unresolved claims pending. The amounts claimed are substantial, and
the ultimate liability in respect of such litigations and claims cannot be
determined at this time. Mobil has provided in its accounts for these items
based on management's best judgment. Mobil is of the opinion that such
liability, to the extent not provided for through insurance or otherwise, is not
likely to be of material importance in relation to its accounts.


52                                                                      Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                                    Reports
- --------------------------------------------------------------------------------

Report of Management

The management of Mobil Corporation has the responsibility for preparing the
accompanying financial statements and for their integrity and objectivity. The
statements, which include amounts that are based, in part, on management's best
estimates and judgments, were prepared in conformity with generally accepted
accounting principles.

     Mobil maintains a system of internal accounting controls and a program of
internal auditing that we believe provide us with reasonable assurance that
Mobil's assets are protected and that published financial statements are
reliable and free of material misstatement.

     The Audit Committee of the Board of Directors, composed solely of directors
who are not officers or employees, meets regularly with Mobil's financial
management and counsel, with Mobil's General Auditor, and with the independent
auditors. These meetings include discussion of internal accounting controls and
the quality of financial reporting. The independent auditors and the General
Auditor have free and independent access to the Audit Committee to discuss the
results of their audits or any other matters relating to Mobil's financial
affairs.

     The accompanying consolidated financial statements have been audited by
Ernst & Young LLP, independent auditors, whose appointment was approved by the
shareholders. Ernst & Young's audit report follows.


/s/ Lucio A. Noto   

Lucio A. Noto   
Chairman and Chief Executive Officer    


/s/ Harold R. Cramer

Harold R. Cramer
Executive Vice President and Chief Financial Officer

Report of Ernst & Young LLP, 
Independent Auditors
Board of Directors and Shareholders
Mobil Corporation

We have audited the accompanying consolidated balance sheets of Mobil
Corporation as of December 31, 1997 and 1998, and the related consolidated
statements of income, changes in shareholders' equity, and cash flows for each
of the three years in the period ended December 31, 1998, appearing on pages 31,
33, and 35 through 52. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits. 

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

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of Mobil
Corporation at December 31, 1997 and 1998, and the consolidated results of its
operations and its cash flows for each of the three years in the period ended
December 31, 1998, in conformity with generally accepted accounting principles.


                                                           /s/ Ernst & Young LLP

Fairfax, Virginia
February 26, 1999


Mobil                                                                       53
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited)

The accompanying tables set forth information concerning Mobil's oil and gas
producing activities at December 31, 1996, 1997 and 1998, and for the years then
ended, as required by Financial Accounting Standard (FAS) 69, Disclosures about
Oil and Gas Producing Activities.

Table 1: Estimated Quantities of Net Proved Oil and Natural Gas Liquids Reserves
(Millions of barrels)

<TABLE> 
<CAPTION> 

                                                Consolidated Companies                          Equity Companies           Worldwide
                                  -----------------------------------------------      ----------------------------------- ---------
                                                   Asia-    Other                                      Asia-      Other
                                  U.S.    Europe   Pacific  Areas(1)        Total      U.S.     Europe Pacific    Areas(1)  
<S>                               <C>     <C>      <C>      <C>             <C>        <C>      <C>    <C>        <C>      <C>  
Reserves at January 1, 1996        986       373       103     1,426        2,888        --          2      --      529       3,419
  Revisions                         (8)        7         5        69           73        --         --      --        9          82
  Improved recovery                 40         9        --        49           98        --         --      --       --          98
  Purchases                          4        --        54        10           68        --         --      --      336(2)      404
  Sales                            (36)       (6)       --       (31)         (73)       --         --      --       --         (73)
  Extensions, discoveries
    and other additions             12        40        --       113          165        --         --      --       --         165
  Production                       (96)      (57)      (39)      (98)        (290)       --         --      --      (23)       (313)

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

Reserves at December 31, 1996      902       366       123     1,538        2,929        --          2      --      851       3,782
  Aera joint venture (3)          (314)       --        --        --         (314)      417         --      --       --         103
  Revisions                        (56)       19        30         4           (3)       --         --      --      190         187
  Improved recovery                 92        10        --         4          106        --         --      --       --         106
  Purchases                          1        16        --         1           18        --         --      --       --          18
  Sales                            (20)       (5)       (9)       (3)         (37)       --         --      --       (5)        (42)
  Extensions, discoveries
    and other additions              2        19        --       235          256        --         --      --       34         290
  Production                       (68)      (57)      (36)     (127)        (288)      (21)        --      --      (30)       (339)

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

Reserves at December 31, 1997      539       368       108     1,652        2,667       396          2      --    1,040       4,105
  Revisions                        (38)       (1)        7       226          194       134(4)      --      --       (2)        326
  Improved recovery                  2        12        --         6           20        85         --      --       --         105
  Purchases                         --        --        --        --           --        --         --      --       --          --
  Sales                             (2)       --        --        (5)          (7)       (1)        (2)     --       --         (10)
  Extensions, discoveries
    and other additions             13         2        --       516(5)       531         1         --      --       21         553
  Production                       (50)      (51)      (31)     (138)        (270)      (38)        --      --      (33)       (341)

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

Reserves at December 31, 1998      464       330        84     2,257        3,135       577         --      --    1,026       4,738
- ------------------------------------------------------------------------------------------------------------------------------------

Developed Reserves
   At January 1, 1996              816       184        93       910        2,003        --          2      --      474       2,479
   At December 31, 1996            759       204        91       967        2,021        --          1      --      666       2,688
   At December 31, 1997            509       180        80     1,035        1,804       268          1      --      633       2,706
   At December 31, 1998            437       160        64     1,200        1,861       416         --      --      616       2,893
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE> 
(1)  Includes principally West Africa, Canada and Venezuela (Consolidated
     companies) and Kazakhstan and Abu Dhabi (Equity companies).

(2)  Acquisition of a 25% interest in a joint venture that owns the Tengiz field
     in the Republic of Kazakhstan.

(3)  In June 1997, Mobil commenced operations of its California heavy-oil joint
     venture with Shell, under the name of Aera Energy LLC, which resulted in an
     increase in proved reserves and a reduction in nonproved reserves.

(4)  Revisions include additions attributable to Mobil's increased equity share
     in Aera Energy LLC.

(5)  Extensions, discoveries and other additions include 474 million barrels in
     the Cerro Negro field in Venezuela.

Mobil's estimated net proved reserves and changes thereto for the years 1996,
1997 and 1998 are presented in Tables 1 and 2. The estimates represent only
those volumes considered to be proved reserves and include fields where
additional investment may be required to recover these reserves.
                                       

54                                                                         Mobil
      
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited)(continued)

     Definitions used in developing these data are in accordance with the SEC
guidelines, which state: "Proved oil and gas reserves are the estimated
quantities of crude oil, natural gas and natural gas liquids which geological
and engineering data demonstrate with reasonable certainty to be recoverable in
future years from known reservoirs under existing economic and operating
conditions, i.e., prices and costs as of the date the estimate is made. Prices
include consideration of changes in existing prices provided only by contractual
arrangements, but not on escalations based on future conditions. Proved
developed oil and gas reserves are reserves that can be expected to be recovered
through existing wells with existing equipment and operating methods. Additional
oil and gas expected to be obtained through the application of fluid injection
or other improved recovery techniques for supplementing the natural forces and
mechanisms of primary recovery should be included as "proved developed reserves"
only after testing by a pilot project or after the operation of an installed
program has confirmed through production response that increased recovery will
be achieved." These reserve estimates are subject to revisions over time as more
information becomes available. In the past, some revisions have been
significant. The company's net proved reserves exclude royalties and interests
owned by others, and natural gas liquids volumes received under natural gas
processing contracts.


Mobil                                                                        55
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited) (continued)

Table 2: Estimated Quantities of Net Proved Natural Gas Reserves (Billions of
cubic feet)

<TABLE> 
<CAPTION> 

                                                Consolidated Companies                         Equity Companies            Worldwide
                                  -------------------------------------------------     -------------------------------    ---------
                                                      Asia-      Other                                Asia-    Other
                                   U.S.     Europe    Pacific    Areas(1)     Total     U.S.   Europe Pacific  Areas(1)  
<S>                               <C>       <C>       <C>        <C>         <C>        <C>    <C>    <C>      <C>         <C>   
Reserves at January 1, 1996       5,061      4,188      4,896      1,784     15,929       --       34    --     2,005       17,968
  Revisions                         (43)       (15)      (338)       (42)      (438)      --        3    --       (36)        (471)
  Improved recovery                  20         10         --         19         49       --       --    --        --           49
  Purchases                           6         --         92        368        466       --       --    --       467(2)       933
  Sales                            (173)        --         --       (182)      (355)      --       --    --        --         (355)
  Extensions, discoveries
    and other additions              16        452         --        190        658       --        2    --        --          660
  Production                       (488)      (434)      (579)      (163)    (1,664)      --       (5)   --       (10)      (1,679)
- ------------------------------------------------------------------------------------------------------------------------------------

Reserves at December 31, 1996     4,399      4,201      4,071      1,974     14,645       --       34    --     2,426       17,105
  Aera joint venture (3)            (34)        --         --         --        (34)     146       --    --        --          112
  Revisions                        (114)       276       (281)        58        (61)      --        3    --       278          220
  Improved recovery                  25         13         --         51         89       --       --    --        --           89
  Purchases                           1         67         --         --         68       --       --    --        --           68
  Sales                             (95)        (1)      (119)       (25)      (240)      --       --    --      (126)        (366)
  Extensions, discoveries
    and other additions              26        159         --        250        435       --        2    --       954        1,391
  Production                       (416)      (450)      (583)      (173)    (1,622)      (7)      (5)   --       (29)      (1,663)
- ------------------------------------------------------------------------------------------------------------------------------------

Reserves at December 31, 1997     3,792      4,265      3,088      2,135     13,280      139       34    --     3,503       16,956
  Revisions                        (279)       295       (141)       (55)      (180)       4        3    --         1         (172)
  Improved recovery                   2         14         --         44         60       34       --    --        --           94
  Purchases                          --         --         --          8          8       --       --    --        --            8
  Sales                             (29)        --         (4)       (24)       (57)      --      (34)   --        --          (91)
  Extensions, discoveries
    and other additions              35         78         --        342        455        2       --    --        28          485
  Production                       (381)      (438)      (496)      (202)    (1,517)     (12)      (3)   --       (36)      (1,568)
- ------------------------------------------------------------------------------------------------------------------------------------

Reserves at December 31, 1998     3,140      4,214      2,447      2,248     12,049      167       --    --     3,496       15,712
- ------------------------------------------------------------------------------------------------------------------------------------

Developed Reserves
   At January 1, 1996             3,923      3,094      3,018      1,212     11,247       --       32    --        --       11,279
   At December 31, 1996           3,826      2,907      2,175      1,138     10,046       --       32    --       856       10,934
   At December 31, 1997           3,368      2,699      1,838      1,273      9,178       77       33    --       834       10,122
   At December 31, 1998           2,878      2,905      1,447      1,339      8,569      115       --    --     1,112        9,796
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE> 
(1)  Includes principally Canada (Consolidated companies) and Qatar and
     Kazakhstan (Equity companies).

(2)  Acquisition of a 25% interest in a joint venture that owns the Tengiz field
     in the Republic of Kazakhstan.

(3)  In June 1997, Mobil commenced operations of its California heavy-oil joint
     venture with Shell, under the name of Aera Energy LLC, which resulted in an
     increase in proved reserves and a reduction in nonproved reserves.

Table 3: Capitalized Costs Related to Oil and Gas Producing Activities
         (In millions)

<TABLE> 
<CAPTION> 
                                          United States                 Europe                   Asia-Pacific                 
At December 31                       1996     1997     1998     1996     1997     1998     1996     1997     1998    
- -----------------------------------------------------------------------------------------------------------------
<S>                               <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C> 
Capitalized costs:
  Unproved properties(1)          $   197  $   233  $   279  $    58  $    11  $    27  $   955  $   984  $   854
  Proved properties, wells,
   plants and other equipment(1)   12,535   10,642    7,999    7,639    7,596    8,367    3,172    3,196    3,685
- -----------------------------------------------------------------------------------------------------------------
Total capitalized costs            12,732   10,875    8,278    7,697    7,607    8,394    4,127    4,180    4,539
Accumulated depreciation,
  depletion and amortization        8,623    7,640    5,682    4,593    4,536    4,947    1,742    2,021    2,329
- -----------------------------------------------------------------------------------------------------------------
Net capitalized costs               4,109    3,235    2,596    3,104    3,071    3,447    2,385    2,159    2,210
- -----------------------------------------------------------------------------------------------------------------
Net capitalized costs of
  equity companies                     --      656    1,022       34       29       --        1       --       -- 
- -----------------------------------------------------------------------------------------------------------------
Total                             $ 4,109  $ 3,891  $ 3,618  $ 3,138  $ 3,100  $ 3,447  $ 2,386  $ 2,159  $ 2,210
- -----------------------------------------------------------------------------------------------------------------

<CAPTION> 

                                          Other Areas                  Total       
At December 31                      1996     1997     1998     1996     1997    1998
- --------------------------------------------------------------------------------------
<S>                               <C>      <C>      <C>      <C>      <C>      <C> 
Capitalized costs:
  Unproved properties(1)          $   324  $   328  $   277  $ 1,534  $ 1,556  $ 1,437
  Proved properties, wells,
   plants and other equipment(1)    5,592    6,682    7,794   28,938   28,116   27,845
- --------------------------------------------------------------------------------------
Total capitalized costs             5,916    7,010    8,071   30,472   29,672   29,282
Accumulated depreciation,
  depletion and amortization        1,514    1,665    2,017   16,472   15,862   14,975
- --------------------------------------------------------------------------------------
Net capitalized costs               4,402    5,345    6,054   14,000   13,810   14,307
- --------------------------------------------------------------------------------------
Net capitalized costs of
  equity companies                  1,558    2,136    2,543    1,593    2,821    3,565
- --------------------------------------------------------------------------------------
Total                             $ 5,960  $ 7,481  $ 8,597  $15,593  $16,631  $17,872
- --------------------------------------------------------------------------------------
</TABLE> 

(1) Prior year data reclassified to conform with current year presentation.


56                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                          Supplementary Information 
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited) (continued)

Table 3 (page 56) summarizes the aggregate amount of capitalized costs related
to oil and gas producing activities and related accumulated depreciation,
depletion and amortization at December 31, 1996, 1997 and 1998. Capitalized
costs include: (1) mineral interests in properties; (2) wells, plants and
related equipment and facilities; and (3) support equipment and facilities used
in oil and gas producing activities.

Table 4: Costs Incurred in Oil and Gas Property Acquisition, Exploration and
Development Activities (In millions) 

<TABLE> 
<CAPTION> 

                                                                                                               Equity 
                                                                Consolidated Companies                        Companies    Worldwide
                                                ----------------------------------------------------------    ---------    ---------
                                                  U.S.       Europe Asia-Pacific  Other Areas        Total   
<S>                                             <C>          <C>    <C>           <C>               <C>       <C>          <C> 
Year ended December 31, 1996 
Property acquisition costs:(1)
  Unproved properties(2)                        $    8       $   46       $  926       $  122       $1,102       $  611       $1,713
  Proved properties(2)                              57           --          789          388        1,234          490        1,724
- ------------------------------------------------------------------------------------------------------------------------------------
Total acquisition costs                             65           46        1,715          510        2,336        1,101        3,437
Exploration costs                                  122          192           79          215          608            6          614
Development costs                                  417          398          273          981        2,069          209        2,278
- ------------------------------------------------------------------------------------------------------------------------------------
Total expenditures                              $  604       $  636       $2,067       $1,706       $5,013       $1,316       $6,329
- ------------------------------------------------------------------------------------------------------------------------------------
Year ended December 31, 1997
Property acquisition costs:
  Unproved properties                           $   50       $   --       $    6       $   71       $  127       $    5       $  132
  Proved properties                                  5           55            7           52          119            2          121
- ------------------------------------------------------------------------------------------------------------------------------------
Total acquisition costs                             55           55           13          123          246            7          253
Exploration costs                                  111          180           94          251          636            1          637
Development costs                                  335          547          374        1,095        2,351          478        2,829
- ------------------------------------------------------------------------------------------------------------------------------------
Total expenditures                              $  501       $  782       $  481       $1,469       $3,233       $  486       $3,719
- ------------------------------------------------------------------------------------------------------------------------------------
Year ended December 31, 1998
Property acquisition costs:
  Unproved properties                           $   71       $   10       $    3       $   23       $  107       $   --       $  107
  Proved properties                                 20           --           --           --           20           --           20
- ------------------------------------------------------------------------------------------------------------------------------------
Total acquisition costs                             91           10            3           23          127           --          127
Exploration costs                                  161          137          123          310          731            2          733
Development costs                                  240          760          347        1,016        2,363          464        2,827
- ------------------------------------------------------------------------------------------------------------------------------------
Total expenditures                              $  492       $  907       $  473       $1,349       $3,221       $  466       $3,687
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

(1) Primarily as a result of recording deferred taxes of $506 million, the total
    costs allocated to property for the Ampolex acquisition exceed the net
    purchase price by $690 million ($607 million-Asia-Pacific; and $83
    million-Other Areas).
(2) Prior year data reclassified to conform with current year presentation.

The table above sets forth certain costs incurred, both capitalized and
expensed, in oil and gas producing activities. Property acquisition costs
represent costs incurred to purchase or lease oil and gas properties.
Exploration costs include costs of geological and geophysical activities and
drilling of exploratory wells. Expenditures to drill and equip development wells
and construct production facilities to extract, treat and store oil and gas are
included in development costs. Exploration and development costs also include
depreciation of support equipment and facilities used in these activities rather
than the acquisition costs for support equipment.


Mobil                                                                       57
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited) (continued)

Table 5: Results of Operations for Oil and Gas Producing Activities 
         (In millions)

<TABLE> 
<CAPTION> 
                                                                                                               Equity 
                                                                   Consolidated Companies                     Companies  Worldwide
                                                  ---------------------------------------------------------   ---------  ---------
                                                     U.S.     Europe  Asia-Pacific   Other Areas     Total   
<S>                                               <C>        <C>      <C>            <C>            <C>       <C>        <C> 
Year ended December 31, 1996                                                       
Revenues:                                                                          
  Trade sales                                     $ 1,027    $ 1,535       $ 1,811       $   464    $ 4,837    $   145    $ 4,982
  Sales to affiliates                               1,458        841           369         1,727      4,395        201      4,596
- ---------------------------------------------------------------------------------------------------------------------------------- 
Total revenues(1)                                   2,485      2,376         2,180         2,191      9,232        346      9,578
Production (lifting) costs                           (937)      (734)         (288)         (702)    (2,661)       (49)    (2,710)
Exploration expenses                                  (76)      (158)         (156)         (122)      (512)        (6)      (518)
Depreciation, depletion and amortization             (638)      (471)         (305)         (182)    (1,596)       (16)    (1,612)
Other operating revenues and (expenses)               263         96             6             4        369        (21)       348
Income tax expense(2)                                (367)      (638)         (878)         (897)    (2,780)      (197)    (2,977)
- ---------------------------------------------------------------------------------------------------------------------------------- 
Results of operations for producing activities    $   730    $   471       $   559       $   292    $ 2,052    $    57    $ 2,109
- ---------------------------------------------------------------------------------------------------------------------------------- 
Year ended December 31, 1997                                                           
Revenues:                                                                              
  Trade sales                                     $   977    $ 1,628       $ 1,641       $   500    $ 4,746    $   332    $ 5,078
  Sales to affiliates                               1,049        647           470         2,022      4,188        529      4,717
- ---------------------------------------------------------------------------------------------------------------------------------- 
Total revenues(1)                                   2,026      2,275         2,111         2,522      8,934        861      9,795
Production (lifting) costs                           (736)      (669)         (288)         (837)    (2,530)      (223)    (2,753)
Exploration expenses                                  (76)      (135)          (85)         (203)      (499)        (2)      (501)
Depreciation, depletion and amortization             (441)      (444)         (333)         (339)    (1,557)       (97)    (1,654)
Other operating revenues and (expenses)               104        132            26           (42)       220       (116)       104
Income tax expense(2)                                (299)      (620)         (822)         (826)    (2,567)      (212)    (2,779)
- ---------------------------------------------------------------------------------------------------------------------------------- 
Results of operations for producing activities    $   578    $   539       $   609       $   275    $ 2,001    $   211    $ 2,212
- ---------------------------------------------------------------------------------------------------------------------------------- 
Year ended December 31, 1998 
Revenues:                                                 
  Trade sales                                     $   781    $ 1,207       $   970       $   416    $ 3,374    $   325    $ 3,699
  Sales to affiliates                                 494        499           311         1,497      2,801        508      3,309
- ---------------------------------------------------------------------------------------------------------------------------------- 
Total revenues(1)                                   1,275      1,706         1,281         1,913      6,175        833      7,008
Production (lifting) costs                           (658)      (645)         (235)         (854)    (2,392)      (309)    (2,701)
Exploration expenses                                 (127)      (122)          (92)         (302)      (643)        --       (643)
Depreciation, depletion and amortization             (605)      (451)         (332)         (498)    (1,886)      (180)    (2,066)
Other operating revenues and (expenses)                32        303           (31)          (95)       209       (155)        54
Income tax expense(2)                                  25       (289)         (374)         (256)      (894)      (114)    (1,008)
- ---------------------------------------------------------------------------------------------------------------------------------- 
Results of operations for producing activities    $   (58)   $   502       $   217       $   (92)   $   569    $    75    $   644
- ---------------------------------------------------------------------------------------------------------------------------------- 
</TABLE> 
         
(1)  Revenues in this table will not agree with Exploration & Producing Segment
     Revenues (pages 16 and 36) because revenues from operations that are
     ancillary to oil and gas producing activities have been classified as Other
     operating revenues and (expenses) for this presentation.

(2)  Includes, for equity companies, Mobil's income taxes on its share of
     results of operations.


Mobil's results of operations for producing activities for the years ended
December 31, 1996, 1997 and 1998, are shown above. Revenues include sales to
unaffiliated parties and sales or transfers (essentially at third-party sales
prices) to Mobil's other operations. All revenues reported in this table are net
of royalty interests of others. Production (lifting) costs and Exploration
expenses are determined as defined by accounting standards.

58                                                                         Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Oil and Gas Producing Activities (unaudited) (concluded)

FAS 69 requires disclosure with respect to future net cash flows from future
production of net proved, developed and undeveloped reserves. Future cash
inflows are computed by applying year-end prices to estimated future production
of net proved reserves. Future price changes are considered only to the extent
they are covered by contractual agreements in existence at year-end. Development
and production costs are based on year-end estimated future expenditures
incurred in developing and producing net proved reserves, assuming continuation
of existing economic conditions. Future income taxes are calculated using
year-end statutory tax rates. Discounted future net cash flows are computed
using a discount factor of 10%.

     The standardized measure data are not intended to replace the historical
cost-based financial data included in the audited financial statements. As such,
many of the data disclosed in this section represent estimates, assumptions and
computations that are subject to continual change as the future unfolds. For
example, a significant decrease in year-end crude oil prices from 1997 to 1998
contributed to the lower discounted future net cash flow amount for 1998.
Accordingly, Mobil cautions investors and analysts that the data are of
questionable utility for decision making.

     Tables 6 and 7 below set forth the standardized measure of discounted
future net cash flows relating to proved oil and gas reserves, and quantify the
causes of the changes in the standardized measure of the cash flows relating to
those reserves. Since the estimates reflect proved reserves only, they exclude
revenues that could result from unproved reserves that could become productive
in later years.

Table 6: Standardized Measure of Discounted Future Net Cash Flows Relating to
         Proved Oil and Gas Reserves (In millions)

<TABLE> 
<CAPTION> 
                                      United States                           Europe                          Asia-Pacific
At December 31                 1996        1997        1998        1996        1997        1998        1996       1997       1998
- ----------------------------------------------------------------------------------------------------------------------------------
Future cash inflows        $ 33,036    $ 16,598    $ 10,516    $ 19,869    $ 17,963    $ 12,824    $ 14,416    $ 9,728    $ 4,027
Future production         
  costs                      (8,125)     (6,261)     (5,216)     (4,374)     (4,859)     (3,969)     (2,196)    (1,895)    (1,634)
Future development        
  costs                      (1,200)       (527)       (384)     (1,202)     (1,285)     (1,029)     (1,030)      (700)      (255)
Future income             
  tax expenses               (7,968)     (3,121)     (1,436)     (7,830)     (6,025)     (3,704)     (4,599)    (2,766)      (637)
- ----------------------------------------------------------------------------------------------------------------------------------
Future net cash flows        15,743       6,689       3,480       6,463       5,794       4,122       6,591      4,367      1,501
10% annual discount       
  for estimated timing    
  of cash flows              (6,919)     (2,897)     (1,516)     (2,091)     (2,078)     (1,459)     (2,578)    (1,498)      (387)
- ----------------------------------------------------------------------------------------------------------------------------------
Standardized measure      
  of discounted future    
  net cash flows              8,824       3,792       1,964       4,372       3,716       2,663       4,013      2,869      1,114
- ----------------------------------------------------------------------------------------------------------------------------------
Standardized measure      
  of discounted future    
  net cash flows of       
  equity companies               --       1,055         170          35          28          --          --         --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Total                      $  8,824    $  4,847    $  2,134    $  4,407    $  3,744    $  2,663    $  4,013    $ 2,869    $ 1,114
==================================================================================================================================
<CAPTION> 
                                        Other Areas                               Total                 
                              1996         1997         1998         1996         1997         1998 
- ----------------------------------------------------------------------------------------------------
<S>                      <C>          <C>          <C>          <C>          <C>          <C> 
Future cash inflows      $  39,107    $  29,776    $  22,814    $ 106,428    $  74,065    $  50,181
Future production
  costs                     (9,952)      (8,715)      (9,049)     (24,647)     (21,730)     (19,868)
Future development
  costs                     (5,006)      (3,639)      (4,236)      (8,438)      (6,151)      (5,904)
Future income
  tax expenses             (15,536)      (9,701)      (2,773)     (35,933)     (21,613)      (8,550)
- ----------------------------------------------------------------------------------------------------
Future net cash flows        8,613        7,721        6,756       37,410       24,571       15,859
10% annual discount
  for estimated timing
  of cash flows             (3,834)      (2,944)      (3,329)     (15,422)      (9,417)      (6,691)
- ----------------------------------------------------------------------------------------------------
Standardized measure
  of discounted future
  net cash flows             4,779        4,777        3,427       21,988       15,154        9,168
- ----------------------------------------------------------------------------------------------------
Standardized measure
  of discounted future
  net cash flows of
  equity companies           1,845        1,585          717        1,880        2,668          887
- ----------------------------------------------------------------------------------------------------
Total                    $   6,624    $   6,362    $   4,144    $  23,868    $  17,822    $  10,055
====================================================================================================
</TABLE> 

Table 7: Changes in Standardized Measure of Discounted Future Net Cash Flows 
         (In millions)

<TABLE> 
<CAPTION> 
Year ended December 31                                                                 1996            1997(1)         1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>             <C>             <C> 
Beginning of year                                                                   $14,082         $23,868         $17,822
Changes resulting from:                                                           
  Sales and transfers of production, net of production costs                         (6,571)         (6,404)         (3,783)
  Net changes in prices and in development and production costs                      15,191         (17,358)        (16,564)
  Extensions, discoveries, additions and purchases, less related costs                2,577           1,533             457
  Development costs incurred during the period                                        2,069           2,351           2,363
  Revisions of previous quantity estimates                                              633             672             539
  Accretion of discount                                                               2,625           4,277           2,784
  Net change in income taxes                                                         (8,135)          8,095           8,218
  Equity companies                                                                    1,397             788          (1,781)
- ----------------------------------------------------------------------------------------------------------------------------
End of year                                                                        $ 23,868        $ 17,822        $ 10,055
============================================================================================================================
</TABLE> 
(1) Prior year data reclassified to conform with current year presentation.

Mobil                                                                         59
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Five-Year Operating Highlights (unaudited)

<TABLE> 
<CAPTION> 
                                                                         1994       1995       1996       1997       1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>        <C>       <C>         <C>        <C> 
Net Production of Liquids (thousands of barrels daily) (1)          
Consolidated companies                                              
  United States                                                           300        282        262        186        136
  International                                                     
    Australia                                                              23         20         29         39         38
    Canada                                                                 57         53         50         49         71
    Equatorial Guinea                                                      --         --          8         37         50
    Indonesia                                                              77         77         66         46         37
    Nigeria                                                               175        157        209        253        248
    Norway                                                                 95         91         83         79         73
    Papua New Guinea                                                       --         --         11         12         11
    United Kingdom                                                         70         75         65         75         63
    Other countries                                                        10         10          9         13         12
- ----------------------------------------------------------------------------------------------------------------------------
  Total International                                                     507        483        530        603        603
- ----------------------------------------------------------------------------------------------------------------------------
Total Consolidated Companies                                              807        765        792        789        739
- ----------------------------------------------------------------------------------------------------------------------------
Mobil's Share of Production of Equity Companies (2)                 
  U.S. (Aera)                                                              --         --         --         58        104
  Abu Dhabi                                                                43         41         42         42         44
  Kazakhstan                                                               --         --         18         36         45
  Other                                                                     4          4          2          2          3
- ----------------------------------------------------------------------------------------------------------------------------
  Total equity companies                                                   47         45         62        138        196
- ----------------------------------------------------------------------------------------------------------------------------
Worldwide Liquids Production                                              854        810        854        927        935
- ----------------------------------------------------------------------------------------------------------------------------
Net Production of Natural Gas (millions of cubic feet daily)        
Consolidated companies                                              
  United States                                                         1,568      1,439      1,333      1,141      1,043
  International                                                     
    Argentina                                                              --         --         30         77        114
    Australia                                                              10         12         25         25          5
    Canada                                                                461        432        416        397        440
    Germany                                                               368        404        463        455        455
    Indonesia                                                           1,654      1,542      1,556      1,571      1,354
    Netherlands                                                            61         66         53         60        104
    Norway                                                                 49         51         53         50         44
    United Kingdom                                                        470        577        618        668        596
- ----------------------------------------------------------------------------------------------------------------------------
  Total International                                                   3,073      3,084      3,214      3,303      3,112
- ----------------------------------------------------------------------------------------------------------------------------
Total Consolidated Companies                                            4,641      4,523      4,547      4,444      4,155
- ----------------------------------------------------------------------------------------------------------------------------
Mobil's Share of Production of Equity Companies (2)                 
  U.S. (Aera)                                                              --         --         --         20         34
  Austria                                                                  12         13         12         13          9
  Indonesia                                                                17         18         --         --         -- 
  Kazakhstan                                                               --         --         24         35         31
  Qatar                                                                    --         --          4         44         66
  Other                                                                    --         --         --         --          1
- ----------------------------------------------------------------------------------------------------------------------------
  Total equity companies                                                   29         31         40        112        141
- ----------------------------------------------------------------------------------------------------------------------------
Worldwide Natural Gas Production                                        4,670      4,554      4,587      4,556      4,296
- ----------------------------------------------------------------------------------------------------------------------------
  Barrels of oil equivalent (thousands of barrels daily)(3)               847        826        831        826        778
- ----------------------------------------------------------------------------------------------------------------------------
Total Production (thousands of barrels daily of oil equivalent)(3)      1,701      1,636      1,685      1,753      1,713
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE> 
See footnotes on page 61.

60                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Five-Year Operating Highlights (unaudited) (continued)     

<TABLE> 
<CAPTION> 
                                                                    1994        1995        1996        1997           1998
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>          <C>        <C>         <C>            <C> 
Net Reserves of Liquids (millions of barrels) (1)             
Consolidated companies                                        
  United States                                                    1,052         986         902         539            464
  Europe                                                             401         373         366         368            330
  Asia-Pacific                                                       175         103         123         108             84
  Other Areas (2)                                                  1,291       1,426       1,538       1,652          2,257
- ------------------------------------------------------------------------------------------------------------------------------
  Total Consolidated Companies                                     2,919       2,888       2,929       2,667          3,135
- ------------------------------------------------------------------------------------------------------------------------------
  Mobil's share of reserves of equity companies(2)(3)                525         531         853       1,438          1,603
- ------------------------------------------------------------------------------------------------------------------------------
Worldwide Reserves of Liquids                                      3,444       3,419       3,782       4,105          4,738
- ------------------------------------------------------------------------------------------------------------------------------
Net Reserves of Natural Gas (billions of cubic feet)                                                               
Consolidated companies                                                                                             
  United States                                                    5,055       5,061       4,399       3,792          3,140
  Europe                                                           4,251       4,188       4,201       4,265          4,214
  Asia-Pacific                                                     5,607       4,896       4,071       3,088          2,447
  Other Areas                                                      1,744       1,784       1,974       2,135          2,248
- ------------------------------------------------------------------------------------------------------------------------------
  Total Consolidated Companies                                    16,657      15,929      14,645      13,280         12,049
- ------------------------------------------------------------------------------------------------------------------------------
  Mobil's share of reserves of equity companies (2)                1,018       2,039       2,460       3,676          3,663
- ------------------------------------------------------------------------------------------------------------------------------
Worldwide Reserves of Natural Gas                                 17,675      17,968      17,105      16,956         15,712
- ------------------------------------------------------------------------------------------------------------------------------
  Barrels of oil equivalent (millions of barrels)(4)               3,204       3,261       3,099       3,072          2,847
- ------------------------------------------------------------------------------------------------------------------------------
Total Reserves (millions of barrels of oil equivalent)(4)          6,648       6,680       6,881       7,177          7,585
- ------------------------------------------------------------------------------------------------------------------------------
Reserves Replacement Percentage(4) (5)                               115%        105%        133%        146%           165%
- ------------------------------------------------------------------------------------------------------------------------------
Average U.S. Sales Price/Transfer Value(6)                                                                         
  Crude Oil (per barrel)                                          $12.91      $ 14.52 $    17.40      $16.59(7)(8)   $10.48(7)
  NGL (per barrel)                                                 10.37        9.94       13.16       11.96           8.26
  Natural Gas (per thousand cubic feet)                             1.72        1.41        2.17        2.38           1.98
- ------------------------------------------------------------------------------------------------------------------------------
Average International Sales Price/                                                                                 
  Transfer Value(6)                                                                                                
  Crude Oil (per barrel)                                          $15.66      $16.94      $20.81      $18.94         $12.29
  Natural Gas (per thousand cubic feet)                             2.44        2.47        2.66        2.72           2.17
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  Crude oil and natural gas liquids (NGL).

(2)  Represents Mobil's share of investees accounted for on the equity method.

(3)  Includes principally West Africa, Canada and Venezuela (Consolidated
     companies) and Kazakhstan and Abu Dhabi (Equity companies).

(4)  Natural gas volumes have been converted to oil equivalent barrels on a BTU
     basis with 5,516, 5,510, 5,519, 5,519 and 5,519 cubic feet of gas per
     barrel in 1994, 1995, 1996, 1997 and 1998, respectively.

(5)  Reserves replacement percentage is calculated by dividing the net
     adjustments to reserves for the year plus the annual production by the
     annual production.

(6)  Transfer values are essentially equal to third-party sales.

(7)  Includes Mobil stand-alone through May 1997 and Mobil plus its equity
     interest in the California alliance with Shell (Aera) thereafter.

(8)  Prior year presentation reclassified to conform with current year
     presentation.

Total Production vs. Reserve Additions (Millions of barrels of oil equivalent)

[BAR CHART APPEARS HERE]

Total Production vs.
Reserve Additions
(Million of barrels of oil equivalent)

     Total Production  Reserve Additions

98         625              1,033
97         640                936
96         617                818
95         597                629    
94         621                714 

For the fifth consecutive year, Mobil added more to its hydrocarbon reserves
than it produced.

Mobil                                                                         61
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------


Refinery Runs vs.
Petroleum Product Sales
(Thousands of barrels daily)

[BAR CHART APPEARS HERE]

        Refinery Runs for Mobil      Petroleum Product Sales   

1998             2,135                      3,440
1997             2,191                      3,343
1996             2,142                      3,345
1995             2,121                      3,222
1994             2,082                      3,075

Refinery runs decreased in 1998, reflecting U.S. divestitures, while product
sales were up 3%.



Number of Employees 
(At year-end)

[BAR CHART APPEARS HERE]

       Petroleum Operations,
         Chemical & Other

1998         41,500    
1997         42,700    
1996         43,000    
1995         50,400    
1994         58,500    

Reductions in the number of employees due to alliances and other initiatives
were partly offset by increases related to new business development.


Five-Year Operating Highlights (unaudited) (concluded)

<TABLE> 
<CAPTION> 
                                                            1994           1995           1996            1997            1998
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>            <C>            <C>             <C>             <C> 
Petroleum Product Sales(1) (thousands of barrels daily)
  United States                                            1,172          1,286          1,362           1,435           1,465
  Europe(2)                                                  810            807            804             679             677
  Asia-Pacific(3)                                            777            799            800             815             824
  Other Areas                                                316            330            379             414             474
- ------------------------------------------------------------------------------------------------------------------------------
  Worldwide                                                3,075          3,222          3,345           3,343           3,440
- ------------------------------------------------------------------------------------------------------------------------------
Petroleum Product Sales(1) (millions of dollars)
  United States                                          $10,492        $11,904        $14,254         $14,848         $11,564
  Europe                                                  14,395         15,421         17,008           2,900           1,300
  Asia-Pacific(3)                                         11,466         12,426         13,258          12,802          10,595
  Other Areas                                              3,707          3,974          4,708           5,412           5,100
- ------------------------------------------------------------------------------------------------------------------------------
  Worldwide                                              $40,060        $43,725        $49,228         $35,962         $28,559
- ------------------------------------------------------------------------------------------------------------------------------
Average United States Product Price (per gallon)(4)         58.4(cent)     60.4(cent)     68.1(cent)      67.5(cent)      51.5(cent)
- ------------------------------------------------------------------------------------------------------------------------------
Refinery Runs (thousands of barrels daily)
  United States                                              857            895            921             956             872
  Europe(2)                                                  440            420            333             371             367
  Asia-Pacific(5)                                            622            657            705             678             725
  Other Areas                                                163            149            183             186             171
- ------------------------------------------------------------------------------------------------------------------------------
  Worldwide Runs for Mobil                                 2,082          2,121          2,142           2,191           2,135
- ------------------------------------------------------------------------------------------------------------------------------
Chemical Sales by Product Category(millions of dollars)
  Petrochemicals                                         $ 2,088        $ 2,914        $ 1,876         $ 2,151         $ 1,618
  Films Products                                             653            764            766             707             655
  Chemical Specialties                                       101            115            126             136             156
  Plastics/Other                                           1,193          1,155             78              --              --
- ------------------------------------------------------------------------------------------------------------------------------
  Net sales to trade                                     $ 4,035        $ 4,948        $ 2,846         $ 2,994         $ 2,429
- ------------------------------------------------------------------------------------------------------------------------------
Number of Employees (year-end)
  Petroleum Operations-United States                      20,300         18,400         13,200          13,200          12,400
                      -International                      25,200         24,300         20,000          19,500          19,300
  Chemical            -United States                       8,100          3,500          2,500           2,600           2,600
                      -International                       1,800          1,600          1,600           1,300           1,400
  Other               -United States                       2,700          2,200          4,400(6)        4,700           4,400
                      -International                         400            400          1,300(6)        1,400           1,400
- ------------------------------------------------------------------------------------------------------------------------------
  Total                                                   58,500         50,400         43,000          42,700          41,500
==============================================================================================================================
</TABLE> 
(1)  Includes supply/other product sales.

(2)  Includes Mobil's share of the downstream alliance with BP that commenced in
     late 1996.

(3)  Includes primarily Australia, China, Hong Kong, Japan, Malaysia, New
     Zealand and Singapore.

(4)  Represents the average amount Mobil charges dealers, service stations, etc.
     for petroleum products, including gasoline. Excise taxes and other items
     included in the "pump" price consumers pay for gasoline are not reflected
     in this amount.

(5)  Includes Australia, Japan, New Zealand and Singapore.

(6)  In 1996, Mobil reorganized its staff support groups, now shown in Other.

Mobil markets auto gasoline through over 15,000 Mobil-branded retail outlets in
over 50 countries. Mobil's primary product supply comes from 23 refineries.
Petroleum product sales (including supply and other sales) have increased 12%
based on daily volume since 1994.

     Mobil operates 28 chemical facilities in 10 countries, and chemical sales
extend to more than 100 countries. Mobil is a 50% partner in a complex in Saudi
Arabia that produces polyethylene and ethylene glycol.

62                                                                        Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                           Supplementary Information
- --------------------------------------------------------------------------------

Five-Year Financial Summary

<TABLE> 
<CAPTION> 
(In millions, except for per-share amounts)                      1994            1995          1996          1997          1998
- -------------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>             <C>           <C>           <C>           <C> 
Revenues                                                    $  67,383       $  75,370     $  81,503     $  65,906     $  53,531
- -------------------------------------------------------------------------------------------------------------------------------
Segment Earnings:                                                         
Petroleum Operations                                                      
  Exploration & Producing -United States                    $     125       $    (107)    $     737     $     697     $      11
                          -International                          951             952         1,372         1,515           633
- -------------------------------------------------------------------------------------------------------------------------------
  Total Exploration & Producing                                 1,076             845         2,109         2,212           644
- -------------------------------------------------------------------------------------------------------------------------------
  Marketing & Refining -United States                             241             226           407           542           574
                       -International                             647             447           506           483           442
- -------------------------------------------------------------------------------------------------------------------------------
  Total Marketing & Refining                                      888             673           913         1,025         1,016
- -------------------------------------------------------------------------------------------------------------------------------
Total Petroleum Operations                                      1,964           1,518         3,022         3,237         1,660
Chemical                                                          102           1,164           306           403           181
- -------------------------------------------------------------------------------------------------------------------------------
Segment Earnings                                                2,066           2,682         3,328         3,640         1,841
Corporate and Financing                                          (307)           (306)         (364)         (368)         (137)
- -------------------------------------------------------------------------------------------------------------------------------
Income Before Change in Accounting Principle                    1,759           2,376         2,964         3,272         1,704
Cumulative Effect of Change in Accounting Principle              (680)(1)          --            --            --            --
- -------------------------------------------------------------------------------------------------------------------------------
Net Income                                                  $   1,079       $   2,376     $   2,964     $   3,272     $   1,704
- -------------------------------------------------------------------------------------------------------------------------------
Per Common Share                                                          
  Income Before Change in Accounting Principle              $    2.14       $    2.93     $    3.69     $    4.10     $    2.12
  Net Income                                                $    1.28       $    2.93     $    3.69     $    4.10     $    2.12
Per Common Share-Assuming Dilution                                        
  Income Before Change in Accounting Principle              $    2.12       $    2.88     $    3.62     $    4.01     $    2.10
  Net income                                                $    1.29       $    2.88     $    3.62     $    4.01     $    2.10
Net Income as Percent of                                                  
  Average shareholders' equity                                  10.4%(2)        13.5%         16.0%         17.0%          9.0%
  Average capital employed(3)                                    8.4%(2)        10.9%         12.7%         13.4%          7.7%
  Revenues                                                       2.6%(2)         3.2%          3.6%          5.0%          3.2%
- -------------------------------------------------------------------------------------------------------------------------------
Investment Spending                                         $   3,927       $   4,525     $   7,019     $   5,306     $   5,500
- -------------------------------------------------------------------------------------------------------------------------------
Balance Sheet Position at Year-End                                        
  Current assets                                            $  11,181       $  12,056     $  12,895     $   9,722     $   8,731
  Net properties, plants and equipment                         25,503          24,850        27,479        24,556        24,727
  Total assets                                                 41,542          42,138        46,408        43,559        42,754
  Current liabilities                                          13,418          13,054        15,248        12,421        12,946
  Long-term debt                                                4,714           4,629         4,450         3,670         3,719
  Shareholders' equity                                         17,146          17,951        19,072        19,461        18,370
      Per common share(4)                                   $   21.30       $   22.35     $   23.81     $   24.41     $   23.31
- -------------------------------------------------------------------------------------------------------------------------------
Debt-to-capitalization Ratio(5)                                   31%             27%           29%           25%           29%
- -------------------------------------------------------------------------------------------------------------------------------
Average Common Shares Outstanding (thousands of shares)       795,910         790,888       788,292       786,294       779,231(6)
- -------------------------------------------------------------------------------------------------------------------------------
Average Common Shares Outstanding--                                       
        Assuming Dilution (thousands of shares)               820,902         817,705       815,748       815,057       807,274(6)
- -------------------------------------------------------------------------------------------------------------------------------
Common Shares Outstanding (thousands of shares, year-end)     791,974         789,120       787,589       783,364       780,533
- -------------------------------------------------------------------------------------------------------------------------------
Shareholders of Common Stock (year-end)                       193,900         188,800       185,600       186,200       178,700
- -------------------------------------------------------------------------------------------------------------------------------
Common Stock Dividends                                      $   1,353       $   1,434     $   1,547     $   1,667     $   1,781
  As percent of net income less preferred dividends               80%(2)          62%           53%           52%          108%
  Per share                                                 $    1.70       $    1.81     $    1.96     $    2.12     $    2.28
- -------------------------------------------------------------------------------------------------------------------------------
Year-end Market Price per Common Share                        $42 1/8         $55 7/8       $61 1/8     $ 72 3/16      $ 87 1/8
- -------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  Accounting change: LCM in 1994.

(2)  Excludes cumulative effect of change in LCM policy in 1994 ($680 million).

(3)  Net income plus income applicable to minority interests plus interest
     expense, net of tax, divided by the sum of average shareholders' equity,
     minority interests and debt.

(4)  Shareholders' equity less the effect of the ESOP-related accounts
     (preferred stock and unearned employee compensation), divided by the number
     of common shares outstanding at year-end.

(5)  Total debt divided by the sum of total debt, shareholders' equity and
     minority interests.

(6)  Average Common Shares Outstanding are used for calculating earnings per
     share and excludes, on a weighted average basis, shares held by the benefit
     plan trust that are accounted for in a manner similar to treasury stock.

Year-end Market Price per 
Common Share 
(Dollars)

[BAR CHART APPEARS HERE]

1998  87.13
1996  61.13
1994  42.13
1992  31.56
1990  29.00
1988  22.75

Over the past 10 years, Mobil's stock price has increased at an annualized rate
of 14%.



Debt-to-Capitalization Ratio
(In percent)

[BAR CHART APPEARS HERE]

1998   29
1996   29
1994   31
1992   34
1990   30
1988   32

Mobil's Debt-to-Capitalization Ratio increased to 29% in 1998, providing
flexibility to invest in growth opportunities and/or increase dividends.

Mobil                                                                         63
<PAGE>
 
- --------------------------------------------------------------------------------
                           Shareholder Information 
- --------------------------------------------------------------------------------
The ticker symbol for Mobil on the New York Stock Exchange is MOB.

     The 1999 annual meeting for shareholders will be held Thursday, May 27, at
10 a.m. in the Fairmont Hotel in Dallas, Texas.

     Dividend payments on common stock are paid quarterly following declaration
by the Board of Directors. The next four tentative payment dates are: June 10,
1999; September 10, 1999; December 10, 1999, and March 10, 2000.

     Direct Registration System offers new investors and participating
shareholders another way to register their shares without having a physical
certificate issued. For information call ChaseMellon Shareholder Services at
1-800-648-9291.

     Mobil's Stock Purchase and Dividend Reinvestment Plan allows new investors
to buy Mobil common stock for as little as $250 and existing shareholders to
automatically reinvest dividends-both without paying commissions or service
fees. Once enrolled, you can make purchases through monthly cash deposits
ranging from $10 to $7,500. Optional cash deposits are invested weekly. For more
information, request a prospectus on Mobil's Stock Purchase and Dividend
Reinvestment Plan from: ChaseMellon Shareholder Services, L.L.C., Dividend
Reinvestment Services, P.O. Box 3336, South Hackensack, New Jersey 07606-1936.
Telephone 1-800-648-9291, or visit Mobil's Internet site.

     Questions about dividend checks, electronic payment of dividends, stock
certificates, address changes, account consolidation, transfer procedures and
year-end tax information? Write: ChaseMellon Shareholder Services, L.L.C.,
Shareholder Relations, P.O. Box 3315, South Hackensack, New Jersey 07606-1915.
Telephone 1-800-648-9291 (Telecommunications Device for the Deaf
1-800-231-5469).

     Shareholders or others wanting general information should write:
Secretary's Department, Room 7D2135, Mobil Corporation, 3225 Gallows Road,
Fairfax, Virginia 22037-0001. Telephone 1-703-846-3898.

An important part of the operations covered by this report is carried on by
operating divisions, subsidiaries and affiliates under the direction and control
of their own managements. Except as otherwise indicated by the context, this
report uses such terms as "Mobil," "corporation," "company," "we" and "our,"
sometimes for the parent corporation and all such divisions, subsidiaries and
affiliates collectively, and sometimes for one or more of them.

     Publications available to shareholders:

     . Mobil's Annual Report on Form 10-K, filed with the Securities and
Exchange Commission.

     . 1998 Mobil Fact Book, a supplement to the annual report with additional
financial and operating data.

     . Quarterly Earnings Press Releases.

     . The People Behind the Commitment: Mobil's EHS Performance Report, an
account of Mobil's environmental, health and safety performance.

     For copies, visit Mobil's Internet site, call Mobil Publications at
1-800-293-5796, or write: Secretary's Department, Room 7D2135, Mobil
Corporation, 3225 Gallows Road, Fairfax, Virginia 22037-0001.

     Analysts and institutional investors wanting information about Mobil should
write: Investor Relations, Room 6D1906, Mobil Corporation, 3225 Gallows Road,
Fairfax, Virginia 22037-0001. Telephone 1-703-846-3955.

     International shareholders should call 201-329-8660 (Telecommunications
Device for the Deaf 201-329-8354).

     Auditors: Ernst & Young LLP, Fairfax Square Tower II, 8075 Leesburg Pike,
Vienna, Virginia 22182-2709.

     Transfer Agent and Registrar in the U.S.: ChaseMellon Shareholder Services,
L.L.C., Overpeck Centre, 85 Challenger Road, Ridgefield Park, New Jersey 07660.
Telephone 1-800-648-9291 (Telecommunications Device for the Deaf
1-800-231-5469).

     Transfer Agent and Registrar in Canada: Montreal Trust Company of Canada,
151 Front Street West, 8th Floor, Toronto, Ontario M5J 2N1, Canada. Telephone
1-416-981-9500. Montreal Trust Company of Canada, Western Gas Tower, 530 8th
Avenue, S.W., Calgary, Alberta T2P 3S8, Canada. Telephone 1-403-267-6800.

     Benefits and contributions: Information on employee benefits plans is
contained in plan descriptions, annual reports and other materials regularly
furnished to employees under the Employee Retirement Income Security Act of
1974. A statement of charitable contributions by Mobil Foundation Inc. is
prepared annually.

Duplicate mailings of this annual report may be eliminated by sending a written
request to: ChaseMellon Shareholder Services, L.L.C., Shareholder Relations,
P.O. Box 3315, South Hackensack, New Jersey 07606-1915. Eliminating duplicate
mailings will not affect your dividend, proxy statement or proxy card mailings.

Mobil's Internet address: http://www.mobil.com

64                                                                      Mobil
<PAGE>
 
- --------------------------------------------------------------------------------
                              Board of Directors
- --------------------------------------------------------------------------------
                  [PHOTO OF BOARD OF DIRECTORS APPEARS HERE]
                  Fites        Branscomb       Schwartz              Heimbold
  Vallance      Renna       Johnson                      Sanford       Jacobson
Munro              Peters        Noto        Kaplan

Lewis M. Branscomb
Elected 1978, Aetna Professor, Public Policy and Corporate Management, Emeritus,
John F. Kennedy School of Government, Harvard University. Committees: Audit
(Chmn.); Public Issues

Donald V. Fites
Elected 1990, Former Chairman and Chief Executive Officer, Caterpillar Inc.
Committees: Management Compensation and Organization; Directors and Board
Affairs; Finance

Charles A. Heimbold Jr.
Elected 1995, Chairman and Chief Executive Officer, Bristol-Meyers Squibb.
Committees: Audit; Directors and Board Affairs; Finance

Allen F. Jacobson
Elected 1988, Former Chairman of the Board and Chief Executive Officer, 3M.
Committees: Directors and Board Affairs (Chmn.); Management Compensation and
Organization

Samuel C. Johnson
Elected 1981, Chairman of the Board, S. C. Johnson & Son, Inc. Committees:
Management Compensation and Organization; Public Issues (Chmn.)

Helene L. Kaplan
Elected 1989, Of Counsel, Skadden, Arps, Slate, Meagher & Flom. Committees:
Audit; Directors and Board Affairs; Finance

J. Richard Munro
Elected 1989, Chairman of the Board, Genentech, Inc. Committees: Management
Compensation and Organization; Public Issues

Lucio A. Noto
Elected 1988, Chairman of the Board and Chief Executive Officer. Joined Mobil
1962. Committee: Executive (Chmn.)

Aulana L. Peters
Elected 1992, Partner, Gibson, Dunn & Crutcher. Committees: Audit; Finance; 
Public Issues

Eugene A. Renna
Elected 1986, President and Chief Operating Officer. Joined Mobil 1968. 
Committee: Executive

Charles S. Sanford Jr.
Elected 1990, Former Chairman and Chief Executive Officer, Bankers Trust
Company. Committees: Directors and Board Affairs; Finance (Chmn.)

Robert G. Schwartz
Elected 1987, Former Chairman of the Board, President and Chief Executive
Officer, Metropolitan Life Insurance Co. Committees: Management Compensation and
Organization (Chmn.); Public Issues

Iain D.T. Vallance
Elected 1996, Chairman, British Telecommunications plc. Committees: Audit;
Finance; Public Issues

                          MOBIL CORPORATION OFFICERS

Lucio A. Noto
Chairman of the Board and 
Chief Executive Officer

Eugene A. Renna
President and Chief 
Operating Officer

Harold R. Cramer
Executive Vice President 
and Chief Financial Officer

Robert F. Amrhein
Vice President

Aldis V. Liventals
Vice President

Samuel H. Gillespie III
Senior Vice President and 
General Counsel

Walter R. Arnheim
Treasurer

Carole J. Yaley
Secretary

Steven L. Davis
Controller

Mobil                                                                        65
<PAGE>
 
                          GRAPHIC APPENDIX LIST - 1998

Front Cover - Photograph of head and upper portion of neon Mobil Pegasus logo, 
              in red, fills most of the page. In the upper portion of the page,
              slightly to the right of Pegasus' head, are the words, "Mobil 
              Annual Report 1998".

Inside front cover - One Graph - centered upper portion of page. Words "Five-
                     year cumulative total return" above graph. Graph--Assume
                     $100 invested on December 31, 1993, in Mobil common stock,
                     S&P 500 index, and a composite index, weighted by market
                     capitalization each year, of the following seven petroleum
                     companies: Exxon Corporation, Chevron Corporation, Royal
                     Dutch Petroleum Company "Shell" Transport and Trading
                     Company p.l.c., Atlantic Richfield Company, British
                     Petroleum Company p.l.c. And Texaco Inc.

                     Center of page are words "Financial highlights" appearing
                     above a table of "Financial highlights".

                     Lower center of page are words "Table of contents". Table 
                     of contents appears in lower center portion of page.

Page 1   -   Photo.
             Top center of page: Lucio A. Noto, Chairman and Chief Executive
             Officer and Eugene A. Renna, Chief Operating Officer.

             Upper left side. Enlarged letters, "Dear shareholder:".

             Lower left side. Enlarged letters, "How we helped ourselves".

             Lower right side. Enlarged letters, "Merger announcement".

Page 2   -   Upper left side. Enlarged letters, "Areas for upstream expansion".

             Middle of page. Enlarged letters, "Among Mobil's strengths is a
             solid portfolio of growth opportunities."

             Lower right side.  Enlarged letters, "Progress downstream".

Page 3   -   Middle left-page are enlarged letters, "Capital spending".

             Lower left-page are enlarged letters, "Board retirements".

             Upper right-page are enlarged letters, "A name to carry forward".
<PAGE>
 
Page 4   -   Upper left-page to lower left page are following enlarged letters
             going down left-hand side of page, "Mobil Corporation", "Upstream",
             "Downstream", "Chemical", and "Technology".

Page 5   -   Upper center/right-page to lower center/right-page are enlarged
             letters, "Partnerships, expansions, realignments and a turbulent
             business environment made 1998 a year of change for Mobil--a year
             in which we advanced our competitive strategies. 
                 An organizational realignment created seven business units
             grouped functionally. At the same time, we entered into or advanced
             a number of cooperative ventures around the world and made progress
             on major projects. Then, as the year's end approached, we announced
             a merger agreement with Exxon Corporation. Pending approvals, the
             combined Exxon Mobil organization should be able to achieve more
             than either company could achieve alone.
                 On the pages that follow, we review key events of the year,
             following a month-by-month timeline."

Page 6   -   Upper left-page are enlarged letters, "Jan".

             Photo.
             Upper right:  Planting a tree in Florida.

             Center of page are enlarged letters, "Feb".

             Photo.
             Lower left:  West McLaren Mercedes Formula One race car.

Page 7   -   Upper right-page are enlarged letters, "Mar".

             Photo.
             Upper right: researchers at Mobil Technology Company's laboratories
             in Paulsboro, New Jersey.

             Center of page are enlarged letters, "Apr".

             Photo.
             Lower left:  double-hull tanker.

Page 8   -   Upper center-page are enlarged letters, "May".

             Drawing.
             Tanker containing LNG regasification plant and single point
             mooring systems.

             Lower left page are enlarged letters, "Jun".
<PAGE>
 
             Photo.
             Lower right page:  oil rig at Cerro Negro heavy oil project.

Page 9   -   Photo.
             Upper left-page: Portion of Mobil gasoline pump showing how to use
             a Mobil Speedpass/TM/ transponder.

             Center page are enlarged letters, "Jul".

             Photo (concluded).
             Lower left page:  oil rig at Cerro Negro heavy oil project.

Page 10  -   Upper left-page are enlarged letters, "Aug".

             Photo.
             Upper left page:  workers installing riser at Oso project.

             Middle right-page are enlarged letters, "Sep".

             Photo.
             Lower right page:  construction workers at onshore RasGas 
             facilities.

Page 11  -   Drawing.
             Upper left page:  chemical molecule.

             Upper center-page are enlarged letters, "Oct".

             Photo (concluded).
             Lower left page:  construction workers at onshore RasGas 
             facilities.

Page 12  -   Upper left page are enlarged letters, "Nov".

             Photo.
             Upper right page: Worker at Mobil OPP plant in
             Shawnee, Oklahoma.

             Lower left/center page are enlarged letters, "Dec".

             Photo.
             Lower left side:  Exxon's CEO Lee Raymond and Mobil's CEO Lou
             Noto signing documents.

Page 13  -   Enlarged letters, "Highlights" in center of page.

             Lower right page are enlarged letters, "Key Financial Indicators"
             appearing above a table of "Key Financial Indicators".
<PAGE>
 
Page 14  -   One Bar Graph:
             Mobil's net income (millions of dollars) for years 1994 through
             1998 (excludes the LCM accounting policy change in 1994).

             Sidebar in lower right-page:
             "Graphs, charts and associated captions on pages 13-52 are not a
             part of the Consolidated Financial Statements and Notes thereto."

Page 15  -   One Bar Graph:
             Annual dividends per share of common stock (dollars) for years 1988
             through 1998.

Page 16  -   Two Bar Graphs:

             Top
             Mobil's Upstream Net Income and Operating Earnings (millions of
             dollars), for years 1996 through 1998.

             Bottom
             Mobil's U.S. and International net production of oil and gas
             (thousands of barrels daily of oil equivalent) for the years 1996
             through 1998.

Page 17  -   Two Bar Graphs:

             Top
             Mobil's U.S. and international crude oil average sales market
             prices (dollars per barrel) for years 1996 through 1998.

             Bottom
             Mobil's U.S. and international average natural gas sales prices 
             (dollars per thousand cubic feet), for years 1996 through 1998.

Page 18  -   Two Bar Graphs:

             Top
             Mobil's Downstream Net Income and Operating Earnings (millions of 
             dollars), for years 1996 through 1998.

             Bottom
             Mobil's U.S. and international refinery runs (thousands of 
             barrels daily), for years 1996 through 1998.

Page 19  -   One Bar Graph:
             Mobil's U.S. and international Downstream petroleum product sales
             volumes (thousands of barrels daily) for years 1996 through 1998.
<PAGE>
 
Page 20  -   One Bar Graph:
             Mobil's Chemical segment Net Income and Operating Earnings (in
             millions of dollars) are presented for years 1996 through 1998.

Page 27   -  One Sidebar:
             "Over the past three years Mobil has spent $1.9 billion to 
             safeguard the environment."

Page 30  -   One Bar Graph:
             Mobil's return on average shareholders' equity (in percent) for 
             years 1996 through 1998.

Page 32  -   Two Bar Graphs:

             Top
             Total Debt of Mobil, U.S. and international (millions of dollars)
             for years 1996 through 1998.

             Bottom
             Mobil's return on average capital employed (in percent) for years 
             1996 through 1998.

Page 34  -   One Bar Graph:
             Proceeds from sales of assets (in millions of dollars) for years 
             1996 through 1998.

Page 37  -   One Bar Graph:
             Mobil's capital expenditures, exploration expenses and equity 
             investments (in millions of dollars) for year 1996 through 1998.

Page 49  -   One Sidebar:
             "Pension Plan Assets and Book Reserves exceeded Accumulated 
             Benefit Obligations by $366 million at the end of 1998."

Page 61  -   One Bar Graph:
             Mobil's total production vs. reserve additions (millions of 
             barrels of oil equivalent) for years 1994 through 1998.

Page 62  -   Two Bar Graphs:

             Top
             Refinery runs vs. petroleum product sales (thousands of barrels 
             daily) for years 1994 through 1998.

             Bottom
             Number of employees (at year-end) for Mobil for years 1994 
             through 
<PAGE>
 
             1998, split between Petroleum Operations segment, Chemical segment
             and Other.

Page 63  -   Two Bar Graphs:

             Top
             Mobil's year-end market price per common share (in dollars) for
             years 1988, 1990, 1992, 1994, 1996 and 1998.

             Bottom
             Mobil's debt-to-capitalization ratio (in percent) for years 1988,
             1990, 1992, 1994, 1996 and 1998.

Page 64  -   Enlarged letters appear in upper center-page, "Shareholder 
             Information".

Page 65  -   Enlarged letters appear in upper center-page, "Board of 
             Directors".

             Photo.
             (Inside Back Cover: Thirteen-member group photo of Mobil's Board
             of Directors.

Back cover - Photograph of the wings of neon Mobil Pegasus in red fills most of
             the page. Upper left-page above the Pegasus' wings are the words,
             "Mobil Corporation," the address, the telephone number, and Mobil's
             internet address.

<PAGE>
 
- --------------------------------------------------------------------------------
                                   Exhibit 21

                                MOBIL CORPORATION
                         Subsidiaries of the Registrant
- --------------------------------------------------------------------------------

                                                                      Percentage
                                                                      of Voting
                                                                      Securities
                                                                       Owned by
                                                        Organized     Immediate
Level                                                 under Laws of     Parent
- -----                                                 -------------   ----------

  1     Mobil Corporation ............................. Delaware
        Major Subsidiaries as of December 31, 1998:
  2        Mobil Business Resources Corporation ....... Delaware        100.00
  2        Mobil Equatorial Guinea Inc. ............... Delaware        100.00
  2        Mobil Exploration and Development
            Venezuela Inc. ............................ Delaware        100.00
  2        Mobil Exploration & Producing U.S. Inc. .... Delaware        100.00
  2        Mobil Exploration and Producing North
            America Inc................................ Nevada          100.00
  3         Mobil California Exploration & Producing
               Asset Company .......................... Delaware          1.50*
  3        Mobil Investments Canada Inc. .............. Delaware         34.69*
  4            Mobil Oil Canada, Ltd. ................. Canada          100.00
  3          Mobil Oil Exploration & Producing
               Southeast Inc. ......................... Delaware        100.00
  3          Mobil Oil Indonesia Inc. ................. Delaware        100.00
  2        Mobil International Finance Corporation .... Delaware        100.00
  3          Mobil Investments Inc. ................... Delaware        100.00
  2        Mobil Natural Gas Inc. ..................... Delaware        100.00
  2        Mobil International Petroleum Corporation .. Delaware        100.00
  3         Mobil de Colombia S.A. .................... Colombia         80.07*
  3         General Petroleum Company, Inc. ........... New York        100.00
  4            Mobil Oil do Brazil (Industrial e
                 Comercio) Ltda. ...................... Brazil           10.00*
  4            Mobil Oil Egypt (S.A.E.) ............... Egypt              .36*
  3          Mobil Chemical International Ltd. ........ Delaware        100.00
  3          Mobil Exploration Norway Inc. ............ Delaware        100.00
  3          Mobil Oil Abu Dhabi Inc. ................. Delaware        100.00
  3          Mobil Oil Aktiengesellschaft ............. Germany          10.00*
  4            Mobil Erdgas-Erdoel GMBH ............... Germany         100.00
  4            Mobil Marketing Und Raffinerie GMBH .... Germany         100.00
  5              Mobil Beteiligungs-und
                   Vertriebsgesellschaft MBH .......... Germany         100.00
  3          Mobil Oil Cameroun ....................... Cameroun         99.98
  3          Mobil Oil Company de Colombia ............ Delaware        100.00
  4            Mobil de Colombia S.A. ................. Colombia           .06*
  3          Mobil Oil Cote d'Ivoire .................. Ivory Coast     100.00
  3          Mobil Oil do Brazil (Industria e
               Comercio) Ltda. ........................ Brazil           90.00*
  3          Mobil Oil East Africa Limited ............ Delaware        100.00
  3          Mobil Oil Egypt (S.A.E.) ................. Egypt            99.28*
  3          Mobil Oil Francaise ...................... France           99.98
  4            Mobil Oil Maroc ........................ Morocco          12.45*
  3          Mobil Oil Malaysia Sendirian Berhad ...... Malaysia        100.00
  3          Mobil Oil Singapore Pte. Ltd. ............ Singapore       100.00
  3          Mobil Petroleum Company Inc. ............. Delaware        100.00


          (Level indicates the parent/subsidiary hierarchical relationship.)
     (Asterisk indicates 100% ownership held by two or more Mobil subsidiaries.)

                                     -30-
<PAGE>
 
- --------------------------------------------------------------------------------
                                   Exhibit 21

                                MOBIL CORPORATION
                         Subsidiaries of the Registrant
- --------------------------------------------------------------------------------

                                                                      Percentage
                                                                      of Voting
                                                                      Securities
                                                                       Owned by
                                                        Organized     Immediate
Level                                                 under Laws of     Parent
- -----                                                 -------------   ----------
  1     Mobil Corporation (continued)
  2       Mobil International Petroleum
           Corporation (continued)
  3        Mobil Petroleum Company Inc. (continued)
  4          Mobil Australia Finance Company Inc. ..... Delaware        100.00
  4          Mobil de Columbia S.A. ................... Columbia         16.28*
  4          Mobil Europe Inc. ........................ Delaware        100.00
  4          Mobil Exploration & Producing Australia
                 Pty Ltd. ............................. Australia       100.00
  5              Ampolex Limited ...................... Australia       100.00
  4          Mobil Holdings (U.K.) Limited ............ Delaware        100.00
  5              Mobil Holdings (Europe and Africa)
                   Limited ............................ Delaware        100.00
  6                Mobil Oil Portuguesa, LDA .......... Portugal         99.98*
  5              Mobil Holdings Limited ............... United Kingdom   99.93*
  6                Mobil Oil Company Limited .......... United Kingdom  100.00
  7                  Vacuum Oil Company Limited ....... United Kingdom   98.00*
  6                Mobil Trading and Supply Limited ... United Kingdom   99.90*
  6                Mobil Data Services Limited ........ United Kingdom  100.00
  7                  Mobil Services Company Limited ... United Kingdom     .01*
  6                Mobil Services Company Limited ..... United Kingdom   99.99*
  7                  Vacuum Oil Company Limited ....... United Kingdom    2.00*
  7                  Superior Oil (U.K.) Limited ...... United Kingdom     .10*
  7                  Mobil Trading and Supply Limited . United Kingdom     .10*
  7                  Mobil Oil Portuguesa, LDA ........ Portugal           .02*
  5              Mobil North Sea Limited .............. Delaware        100.00
  5              Mobil Oil Hellas A.E. ................ Greece             .03*
  5              Superior Oil (U.K.) Limited .......... United Kingdom   99.90*
  4          Mobil Holdings Benelux Inc. .............. Delaware        100.00
  5              Mobil Oil B.V. ....................... The
                                                        Netherlands     100.00
  6                Mobil Oil, S.A. .................... Spain           100.00
  5              Mobil Oil Hellas A.E. ................ Greece           99.97*
  4          Mobil Marine Transportation Limited ...... Canada          100.00
  5              Mobil Shipping and Transportation
                     Company .......................... Liberia         100.00
  4          Mobil Oil (Switzerland) .................. Switzerland     100.00
  4          Mobil Oil Aktiengesellschaft ............. Germany          90.00*
  4          Mobil Oil Australia Limited .............. Australia       100.00
  5              Vacuum Oil Company Proprietary
                     Limited .......................... Australia       100.00
  6                Mobil Refining Australia Pty LTD. .. Australia       100.00
  4          Mobil Oil Austria Aktiengesellschaft ..... Austria         100.00
  4          Mobil Oil Egypt (S.A.E.) ................. Egypt              .36*
  4          Mobil Oil Hong Kong Limited .............. Hong Kong        99.90
  4          Mobil Oil Kazakhstan Inc. ................ Delaware        100.00
  4          Mobil Oil Maroc .......................... Morocco          87.55*


          (Level indicates the parent/subsidiary hierarchical relationship.)
     (Asterisk indicates 100% ownership held by two or more Mobil subsidiaries.)


                                     -31-
<PAGE>
 
- --------------------------------------------------------------------------------
                                   Exhibit 21

                                MOBIL CORPORATION
                         Subsidiaries of the Registrant
- --------------------------------------------------------------------------------

                                                                      Percentage
                                                                      of Voting
                                                                      Securities
                                                                       Owned by
                                                        Organized     Immediate
Level                                                 under Laws of     Parent
- -----                                                 -------------   ----------

  1     Mobil Corporation (concluded)
  2       Mobil International Petroleum
            Corporation (concluded) 
  3         Mobil Petroleum Company Inc. (concluded)
  4           Mobil Oil New Zealand Limited ........... New Zealand     100.00
  4           Mobil Oil Qatar Inc ..................... Delaware        100.00
  4           Mobil Oil Turk A. S ..................... Turkey          100.00
  4           Mobil Producing Netherlands Inc. ........ Delaware        100.00
  4           Mobil Saudi Arabia Inc. ................. Delaware        100.00
  4           Mobil Sekiyu Kabushiki Kaisha ........... Japan           100.00
  4           Mobil Vietnam Inc. ...................... Delaware        100.00
  4           Mobil Yanbu Petrochemical Company Inc. .. Delaware        100.00
  4           Mobil Yanbu Refining Company Inc. ....... Delaware        100.00
  4           Mobil Petrochemical Sales and Supply
                Corporation ........................... Delaware        100.00
  3         Mobil Petrochemicals International
              Limited ................................. Delaware        100.00
  3         Mobil Pipe Line Company ................... Delaware        100.00
  3         Mobil Plastics Europe, Inc. ............... Delaware        100.00
  4           Mobil Petrochemical Holdings Co. Inc. ... Delaware        100.00
  3         Mobil Sales and Supply Corporation ........ Delaware        100.00
  4           Mobil Gas Liquids Trading, Inc. ......... Delaware        100.00
  2       Mobil Oil Corporation ....................... New York        100.00
  3         Mobil Alaska Pipeline Company ............. Delaware        100.00
  3         Mobil California Exploration and Producing
              Asset Company ........................... Delaware         98.50*
  3         Mobil Chemical Company Inc. ............... Delaware        100.00
  3         Mobil Development Nigeria Inc. ............ Delaware        100.00
  4           Mobil Producing Nigeria Unlimited ....... Nigeria          50.00*
  3         Mobil Exploration and Producing Services
             Inc. ..................................... Delaware        100.00
  3         Mobil Exploration Nigeria Inc. ............ Delaware        100.00
  4           Mobil Producing Nigeria Unlimited ....... Nigeria          50.00*
  3         Mobil Oil Credit Corporation .............. Delaware        100.00
  3         Mobil Oil Nigeria Public Limited Company .. Nigeria          60.00
  3         Mobil Oil Refining Corporation ............ Delaware        100.00
  3         Mobil Technology Company .................. Delaware        100.00
  3         Mobil Rocky Mountain Inc. ................. Delaware        100.00
  4           Mobil Investments Canada Inc. ........... Delaware         65.31*
  2       Mobil Produccion E Industrialization de
           Venezuela .................................. Delaware        100.00
  2       Mobil Producing Texas & New Mexico Inc. ..... Delaware        100.00
  2       Mobil Qatargas Inc. ......................... Delaware        100.00
  2       The Superior Oil Company .................... Delaware        100.00


          (Level indicates the parent/subsidiary hierarchical relationship.)
     (Asterisk indicates 100% ownership held by two or more Mobil subsidiaries.)

                                     -32-

<PAGE>
 
- --------------------------------------------------------------------------------
                                   Exhibit 23

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
- --------------------------------------------------------------------------------


We consent to the incorporation by reference in this Annual Report on Form 10-K
of Mobil Corporation of our report dated February 26, 1999, included in the 1998
Annual Report to Shareholders of Mobil Corporation.

Our audits also included the financial statement schedule of Mobil Corporation
listed in Item 14(a). This schedule is the responsibility of the Company's
management. Our responsibility is to express an opinion based on our audits. In
our opinion, the financial statement schedule referred to above, when considered
in relation to the basic financial statements taken as a whole, presents fairly
in all material respects the information set forth therein.

We also consent to the incorporation by reference in the Registration Statements
on Form S-8 (Nos. 33-18130 and 333-16819) pertaining to the Employees Savings
Plan of Mobil Oil Corporation; Form S-8 (No. 33-5797) pertaining to the 1986
Mobil Incentive Compensation and Stock Option Plan; Form S-3 (No. 33-34133-01)
of the Mobil Oil Corporation Employee Stock Ownership Plan Trust for the
registration of $300,000,000 principal amount of debt securities guaranteed by
Mobil Corporation; Form S-3 (No. 33-43745) for the registration of
$1,500,000,000 of Mobil Corporation Debt Securities; Form S-3 (No. 33-49945) for
the registration of $1,500,000,000 of Mobil Corporation Debt Securities; Form
S-8 (No. 33-48887) pertaining to the 1991 Mobil Incentive Compensation and Stock
Option Plan; Form S-3 (No. 33-50943) pertaining to the Mobil Corporation Stock
Purchase and Dividend Reinvestment Plan for the registration of 5,000,000 shares
of Mobil Corporation Common Stock (on a pre two-for-one stock split basis) and
related Preferred Share Purchase Rights; Form S-8 (No. 33-61657) pertaining to
the 1995 Mobil Incentive Compensation and Stock Ownership Plan; Form S-3 (No.
333-13457) for the registration of $650,000,000 Pass Through Certificates with
the applicable underlying payments guaranteed by Mobil Corporation; and in the
related Prospectuses of our report dated February 26, 1999, with respect to the
financial statements incorporated herein by reference and our report included in
the preceding paragraph with respect to the financial statement schedule
included in this Annual Report on Form 10-K of Mobil Corporation.



                                                        /s/ Ernst & Young LLP

                                                            Ernst & Young LLP



Fairfax, Virginia
March 26, 1999

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

                                     -33-

<PAGE>
 
                               MOBIL CORPORATION
                               -----------------

                               POWER OF ATTORNEY
                               -----------------


     KNOW ALL PERSONS BY THESE PRESENTS, that each of the under-signed directors
and/or officers of Mobil Corporation, a Delaware corporation, hereby constitutes
and appoints WALTER R. ARNHEIM, STEVEN L. DAVIS, CAROLE J. YALEY and GORDON G.
GARNEY his or her true and lawful attorneys-in-fact and agents to execute in his
or her name and capacity the 1998 annual report on Form 10-K of this Corporation
and any amendments to such annual report with all exhibits thereto, and any and
all documents in connection therewith pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934, as amended, each of such persons having full
power to act without the others;

     AND FURTHER, that each of the undersigned directors and/or officers of the
Corporation hereby grants to said attorneys-in-fact and agents and each of them,
full power and authority to do and perform any and all acts and things essential
and necessary to be done in and about the premises, as fully to all intents and
purposes as he or she might or could do in person in connection with the proper
exercise of the powers granted hereunder.

     IN WITNESS WHEREOF, the undersigned, as directors and/or officers of said
Mobil Corporation or as individuals, have here- unto set their hands and seals
as of the 26th day of February, 1999.


NAME AND TITLE                           /s/ Lucio A. Noto
                                         -------------------------------------
                                         Lucio A.  Noto,  Director, Chairman
                                         of the Board, Principal Executive
                                         Officer


                                         /s/ Harold R. Cramer
NAME AND TITLE                           -------------------------------------
                                         Harold R. Cramer, Executive Vice
                                         President, Principal Financial Officer
<PAGE>
 
NAME AND TITLE                           /s/ Steven L. Davis
                                         -------------------------------------
                                         Steven L. Davis, Controller,         
                                         Principal Accounting Officer         
                                                                              
                                                                              
NAME AND TITLE                           /s/ Lewis M. Branscomb
                                         -------------------------------------
                                         Lewis M. Branscomb, Director         
                                                                              
                                                                              
NAME AND TITLE                           /s/ Donald V. Fites               
                                         -------------------------------------
                                         Donald V. Fites, Director            
                                                                              
                                                                              
NAME AND TITLE                           /s/ Charles A. Heimbold, Jr.
                                         -------------------------------------
                                         Charles A. Heimbold, Jr., Director   
                                                                              
                                                                              
NAME AND TITLE                           /s/ Allen F. Jacobson
                                         -------------------------------------
                                         Allen F. Jacobson, Director          
                                                                              
                                                                              
NAME AND TITLE                           /s/ Samuel C. Johnson
                                         -------------------------------------
                                         Samuel C. Johnson, Director          
                                                                              
                                                                              
NAME AND TITLE                           /s/ Helene L. Kaplan
                                         -------------------------------------
                                         Helene L. Kaplan, Director           
                                                                              
                                                                              
NAME AND TITLE                           /s/ J. Richard Munro
                                         -------------------------------------
                                         J. Richard Munro, Director           
                                                                              
                                                                              
NAME AND TITLE                           /s/ Aulana L. Peters
                                         -------------------------------------
                                         Aulana L. Peters, Director           
                                                                              
                                                                              
                                                                              
NAME AND TITLE                           /s/ Eugene A. Renna
                                         -------------------------------------
                                         Eugene A. Renna, Director
<PAGE>
 
NAME AND TITLE                           /s/ Charles S. Sanford, Jr.
                                         -------------------------------------
                                         Charles S. Sanford, Jr., Director



NAME AND TITLE                           /s/ Robert G. Schwartz
                                         -------------------------------------
                                         Robert G. Schwartz, Director



NAME AND TITLE                           /s/ Iain D. T. Vallance
                                         -------------------------------------
                                         Iain D. T. Vallance, Director

<PAGE>
 
                               MOBIL CORPORATION

                               BOARD RESOLUTION

                            **********************



Review and Approval 
of Annual Report on 
Form 10-K
- -------------------


     RESOLVED, that the Corporation's 1998 Annual Report on Form 10-K in
substantially the form presented at this meeting, be and the same hereby is
approved, and that the officers of the Corporation be and they and each of them
hereby are authorized to sign and file such Report, including any amendments to
such annual report on Form 10-K, on behalf of the Corporation with the
Securities and Exchange Commission, the New York Stock Exchange and such other
exchanges as may be necessary and appropriate, with such changes or amendments
therein, if any, as may be approved by the officer or officers signing the same,
which changes or amendments are hereby expressly approved.


<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
EXHIBIT  TO BE FILED ELECTRONICALLY. FINAL PUBLISHED HARD COPY WILL NOT CONTAIN
THIS EXHIBIT. (NOR WILL THIS PAGE BE LISTED IN THE INDEX OF THIS 10-K).
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                             714
<SECURITIES>                                         0
<RECEIVABLES>                                    5,518
<ALLOWANCES>                                         0
<INVENTORY>                                      1,911
<CURRENT-ASSETS>                                 8,731
<PP&E>                                          48,681
<DEPRECIATION>                                  23,954
<TOTAL-ASSETS>                                  42,754
<CURRENT-LIABILITIES>                           12,946
<BONDS>                                          3,719
                                0
                                        641
<COMMON>                                           898
<OTHER-SE>                                      16,831
<TOTAL-LIABILITY-AND-EQUITY>                    42,754
<SALES>                                         52,140<F1>
<TOTAL-REVENUES>                                53,531<F1>
<CGS>                                           32,909
<TOTAL-COSTS>                                   35,740
<OTHER-EXPENSES>                                10,525
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 451
<INCOME-PRETAX>                                  3,060
<INCOME-TAX>                                     1,356
<INCOME-CONTINUING>                              1,704
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,704
<EPS-PRIMARY>                                     2.12
<EPS-DILUTED>                                     2.10
<FN>
<F1>SALES AND TOTAL REVENUES INCLUDE $5,853 MILLION OF EXCISE AND STATE GASOLINE
TAXES
</FN>
        

</TABLE>


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