Experts Available on Ultra Clean Fuels and EPA Diesel Mandate

TULSA, Oklahoma, May 25, 2004 -- With the recent signing of new federal standards to slash soot from diesel engines, and with persistently high energy costs and the ongoing debate over how to economically achieve compliance with new environmental regulations, experts are available for comment and analysis of commercially viable ultra-clean fuels.

The U.S. Environmental Protection Agency (EPA) last week enacted new regulations to remove 99 percent of the sulfur in diesel fuel for off-road diesel engines by 2010, as well as to cut emissions from off-road vehicles by more than 90 percent. Off-road vehicles include construction, agricultural and industrial diesel-powered equipment. These regulations supplement the 2000 Clean Diesel Truck and Bus Rule that requires significant reductions in these pollutants for on-highway vehicles, including heavy-duty trucks and buses.

There remains some debate over how best to fulfill the new requirements, including their potential costs and advisability of various technological solutions, including both clean engine and clean fuels technologies. One solution involves ultra-clean diesel produced from natural gas by gas-to-liquids (or GTL) technology. These fuels are essentially free of soot and sulfur emissions covered by the new EPA regulations. GTL, which economically recovers stranded natural gas, recently achieved commercialization with the completion of the Syntroleum plant at the Port of Catoosa, near Tulsa, Oklahoma.

  Available Experts Include:

   * Kenneth Agee:  Technical analysis of clean fuels solutions to meet EPA
     regulations

     Prior to founding Syntroleum Corporation in 1984, Mr. Agee worked 15
     years in crude oil refining and natural gas processing for Texaco,
     Cities Service and Transok, Inc.  Agee researched Fischer-Tropsch
     technology and developed the Syntroleum Process(R) for converting
     natural gas into synthetic liquid fuels.  Currently, he is Chairman and
     Chief Executive Officer of Syntroleum Corporation.

   * John B. "Jack" Holmes, Jr.:  Industry veteran on commercially viable
     solutions

     Now serving as President and Chief Operating Officer of Syntroleum
     Corporation, many industry observers know 33-year industry veteran
     Holmes best for his role as Zilkha Energy Company's President and Chief
     Operating Officer.  When Zilkha was acquired by Sonat, Inc. in 1998,
     Mr. Holmes became Senior Vice President of Sonat, Inc. and
     President/CEO of its Sonat Exploration subsidiary.  In 1999, Sonat was
     acquired by El Paso Energy Company, where Holmes became President of
     Oil and Gas Operations.  In 2001 El Paso Energy merged with The Coastal
     Corporation, and Mr. Holmes took the position of Chief Operating
     Officer for Petroleum Assets.

   * Larry Weick:  Financial analysis of clean fuels solutions

     Mr. Weick, who previously served Arco Oil & Gas Company for 12 years,
     is Syntroleum Corporation senior vice president and chief financial
     officer.  In addition, Mr. Weick has: co-founded a horizontal drilling
     technology company; developed and managed independent power project
     proposals for natural gas and electricity utility companies; worked as
     senior advisor to Papua New Guinea's Ministry of Minerals & Energy on
     electric power system economics, power supply planning, and
     restructuring; and served in Africa with the Peace Corps building rural
     electrification projects.

   * Jeffrey Bigger:  Technical and scientific analysis of clean fuels
     solutions

     Mr. Bigger has 23 years of experience in management of research,
     engineering, design and optimization of oil, gas and chemical
     production facilities.  As ARCO's Dallas-based Gas-to-Liquids
     Technology Manager, he was responsible for that company's GTL program,
     including research, engineering, pilot plant and commercialization
     efforts.  Mr. Bigger also served as Facility Engineering Manager for
     ARCO E&P Technology, Process Engineering Manager for ARCO Oil and Gas,
     Area Facility Engineer for ARCO Alaska, and a Process Engineer for
     Oxirane and Rohm & Haas.  He now serves as Vice President of
     Engineering at Syntroleum Corporation.

To schedule an interview, please contact Jack Holmes of Syntroleum Corporation at 918-592-7900 or Eric Berman of Kekst and Company at 212-521-4894.

Syntroleum Corporation owns a proprietary gas-to-liquids process for converting natural gas into synthetic liquid hydrocarbons. The Company plans to use its GTL technology, as well as other third party gas processing technologies, to develop and participate in gas monetization projects in a number of global locations.