EXHIBIT 99.1 
  
  

                                                     FOR IMMEDIATE RELEASE 
                                                 TUESDAY, DECEMBER 1, 1998 
  
  
                   EXXON AND MOBIL SIGN MERGER AGREEMENT 
  
  
      NEW YORK, December 1 -- Exxon and Mobil announced today that they have
 signed a definitive agreement to merge the two companies. 

      Under the terms of the agreement, each share of Mobil will be
 converted into 1.32015 shares of Exxon.  As a result of the merger, Mobil
 shareholders will own about 30 percent of the company, while Exxon
 shareholders will own about 70 percent. 

      Upon completion of the merger, the company's name will be Exxon Mobil
 Corporation, with headquarters in Irving, Texas. 

      L.R. Raymond will be the Chairman, Chief Executive Officer and
 President of Exxon Mobil Corporation.  L.A. Noto will join the Exxon Mobil
 Board of Directors as Vice Chairman. 

      E.A. Renna will join the Board as a Senior Vice President and
 Director.  Four additional members of Mobil's Board will be invited to join
 the Exxon Mobil Board as non-employee Directors, bringing Board membership
 for the company to a total of 19 Directors. 

      The company will be organized on a functional basis.  The Upstream
 will report to H.J. Longwell, the Downstream to Mr. Renna and the Chemical
 business to R. Dahan.  Worldwide downstream headquarters for the company
 will be located in Fairfax, Virginia.  Worldwide upstream and chemical
 headquarters will be in Houston, Texas.  Exxon Mobil will continue to use
 both the Exxon brand and the Mobil brand. 

      "This merger brings together two outstanding organizations that share
 common values, have compatible strategies and demonstrated track records of
 achievement," said Mr. Raymond and Mr. Noto in a joint statement.  "The
 merger will significantly enhance shareholder value by enabling us to
 manage the combined assets of Exxon and Mobil to produce a higher return on
 capital employed than either company could achieve on a stand-alone basis. 

      "The merging of these two companies will deliver significant near-term
 pre-tax synergies of about $2.8 billion," they said.  "This merger will
 enhance our ability to be an effective global competitor in a volatile
 world economy and in an industry that is more and more competitive.  It
 allows us to manage our expanded, combined asset base to deliver increasing
 returns and growth to our shareholders while reducing our operating costs. 
 It also allows us to continue delivering quality products to our customers
 at competitive prices into the future.  We are confident that with the
 exceptional quality of Exxon's and Mobil's employees, we will succeed in
 meeting these objectives." 

      They noted that combining Exxon and Mobil will create a major global
 company, headquartered in the U.S., with the technology, the resources and
 the people to compete effectively with other companies of a similar or
 larger scale in the world oil industry of the 21st Century.  "The relative
 strengths of our two companies are highly complementary," they said.  "When
 combined, Exxon Mobil will provide better opportunities for both our
 shareholders and employees than those they would experience without this
 merger.  By combining our operations, we also will be better able to meet
 the needs of our customers for quality products in the next century.  It's
 a good match." 

      "While we expect to benefit from a reduction of costs in the short-
 term, our real objective is to maximize growth and return on investment by
 successfully managing the existing assets of Exxon and Mobil and by
 selecting the best projects from the large portfolio of investment options
 that will be created by this merger," they said.  "Combining the
 proprietary technologies and management expertise of the two companies also
 will reinforce the selection of Exxon Mobil as the partner of choice,
 creating additional resource opportunities in the future." 

      In discussing the strategic fit of Exxon and Mobil, Mr. Raymond said
 the two companies line up well with each other in almost every facet of the
 business.  "In the exploration and production area, for example, Mobil's
 and Exxon's respective strengths in West Africa, the Caspian region,
 Russia, South America, and North America line up well, with minimal
 overlap.  Our respective deepwater assets and deepwater technology also
 complement each other well." 

      Exxon Mobil will have combined natural gas sales of about 14 billion
 cubic feet per day, giving the company a solid position in this
 increasingly important worldwide fuel resource.  Mobil also brings major
 LNG assets and experience to the combined company that complement Exxon's
 assets and technology with little overlap. 

      Mr. Noto said that in refining and marketing, Exxon and Mobil each
 have significant global brand recognition, expertise and technology.  "In
 the lubricant area, for example, Exxon is an important producer of lube
 base stocks, which fits well with Mobil's leadership in lubes marketing." 

      In the U.S., Exxon Mobil will approach the size and scale nationally
 and regionally of the new downstream joint venture companies announced by
 other major competitors.  Outside the U.S., Exxon Mobil will be
 competitively well positioned in key Asian markets and will have
 complementary positions in South America.  The merger also builds on
 Mobil's significant position in Africa. 

      "Chemicals are another area where there is a good strategic fit," said
 Mr. Raymond.  "Exxon's chemical product line aligns well with Mobil's
 chemical products.  The two companies also share a common focus on
 efficiency and site integration.  Exxon Mobil should realize immediate
 benefits through sharing the proprietary technology and best practices of
 each company. 

      Exxon and Mobil also bring important, state-of-the-art proprietary
 technologies to the venture that will greatly benefit the merged company. 
 In exploration and production, this includes leading-edge geoscience
 technology to find and develop oil and gas reserves, arctic technology, and
 heavy oil technology.  In refining, marketing and chemicals, this includes
 catalyst, synthetic lubricant and chemical manufacturing technology. 

      The merger is subject to shareholder and regulatory approval, as well
 as other customary conditions.  It is intended that the merger will qualify
 as a tax-free reorganization in the United States and that it will be
 accounted for on a "pooling of interests" basis.  In addition, the merger
 agreement provides for payment of termination fees of $1.5 billion under
 certain circumstances.  The parties also have entered in an option
 agreement that grants Exxon the option under specified circumstances to
 purchase up to 14.9 percent of the authorized but unissued common stock of
 Mobil. 

      Exxon and Mobil expect to provide details of the proposed merger to
 their shareholders prior to their annual meetings in April and May,
 respectively. 

      Exxon's program of repurchasing its share to reduce the number of
 shares outstanding will be discontinued; however, Exxon will continue to
 repurchase its shares to offset dilution from employee incentive programs. 

      Exxon was advised on the merger by J.P. Morgan.  Mobil was advised by
 Goldman Sachs. 

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 FOR FURTHER INFORMATION, CONTACT: 
  
 Exxon Media Relations              Mobil Media Relations 
 Phone: 972-444-1107                Phone: 703-846-2500