Marathon and Syntroleum Expand Synthetic Fuels Demonstration Plant

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FOR IMMEDIATE RELEASE

Marathon and Syntroleum Expand Synthetic Fuels Demonstration Plant

Completed Facility to Include All Components of Full Commercial-Scale

Plant, Enabling Comprehensive Operator Training

TULSA AND HOUSTON, OKLAHOMA, May. 30 -/E-Wire/-- Syntroleum Corporation (Nasdaq: SYNM) and Marathon Oil Company, a wholly owned subsidiary of Marathon Oil Corporation (NYSE: MRO), today announced agreements to expand the configuration and capability of the Syntroleum gas-to-liquids (GTL) complex to supply ultra-clean fuels for long-term testing in government and private fleet vehicles. The GTL demonstration complex, currently under construction at the Port of Catoosa near Tulsa, OK, is part of an ultra-clean fuels production and demonstration project managed by the U.S. Department of Energy's (DOE) National Energy Technology Laboratory. The GTL complex is scheduled for completion in mid-2003.

Under the terms of the $36 million project, the DOE is providing $16 million in funding, and Syntroleum is contributing key components of its previously developed GTL demonstration plant, which has been moved from Washington State to Tulsa. Marathon has provided most of the remaining funding for the original project, plus funding for additional equipment to better evaluate the probable cost of scaling up the demonstration plant and to support future operator training for commercial scale GTL plants after the DOE project is complete. In addition to this funding, Marathon is providing technical and project management personnel to work with Syntroleum in the engineering, construction and operation of the synthetic fuels plant. The agreement contemplates the additional participation of other Syntroleum licensees in the project.

The expanded configuration will include installation of a gas turbine and other equipment to make the completed 70 barrel-per-day complex mirror the major components of a commercial scale plant. In return for the additional investment, Marathon will have access to the complex for operator training and will have the right to convert its investment into a combination of credits against future license fees and Syntroleum stock at no less than $6 per share. Additionally, under the new agreements, a previous contractual restriction that prevented Marathon from acquiring more than 10% of Syntroleum's common stock has been waived. Marathon currently owns less than a 1% equity interest in the company.

"This additional commitment is consistent with Marathon's integrated gas strategy -- a key element of which is to commercialize stranded gas reserves using a variety of technologies, including Syntroleum's gas to liquids technology," stated Tim Tipton, vice president of technology for Marathon. "While the Port of Catoosa complex is small, it is a complete GTL demonstration facility that mirrors a commercial scale plant, allowing us to not only gain process knowledge and experience, but also train operators in anticipation of the possible development of a commercial scale plant."

"We are pleased that Marathon is expanding its commitment and funding for the DOE clean fuels demonstration plant," stated Kenneth Agee, Syntroleum chairman and CEO. "We are excited about the prospect of being able to provide ultra-clean synthetic fuels for long-term testing in government vehicles. We are confident that the test results will provide additional impetus to adopt GTL fuels, especially in a number of non-attainment areas where cleaner exhaust emissions are increasingly critical for a cleaner environment."

Other participants in this project include Integrated Concepts & Research Corporation, as the prime contractor, plus the U.S. Department of Defense, U.S. National Park Service, Washington Metropolitan Area Transit Authority, Massachusetts Institute of Technology's Sloan Automotive Laboratory, Arthur D. Little, Inc., University of Alaska at Fairbanks, and West Virginia University's transportable emissions testing laboratory. DaimlerChrysler and Volkswagen are also participants in the Project to demonstrate the use of these fuels in vehicles having prototype diesel engines and emission control systems.

The DOE project calls for the production of ultra-clean synthetic diesel and other fuels for a series of test programs that will be managed by Integrated Concepts Research Corporation. The synthetic fuels will be initially tested in fleet vehicles in Washington, DC and Denali Park, Alaska.

Marathon is an energy company engaged in the worldwide exploration, production and transportation of crude oil and natural gas. Through Marathon Ashland Petroleum LLC, the company also refines, markets and transports petroleum products in the United States. For more information about Marathon, please visit the company's Web site at www.Marathon.com .

Syntroleum Corporation is the developer of a proprietary process for converting natural gas into synthetic liquid hydrocarbons. The company, in partnership with others, plans to build specialty chemical and fuels plants using its technology in a number of global locations. Additionally, Syntroleum licenses its process to oil companies for the manufacture of fuels. For further information about Syntroleum, visit the company's website at www.Syntroleum.com .

This document includes forward-looking statements as well as historical information. Forward-looking statements include, but are not limited to, statements relating to the testing, certification, characteristics and use of synthetic fuels and alternative fuels, the Syntroleum Process and related technologies and products, GTL plants based on the Syntroleum Process (including the development of planned plants), the economic use of such plants and the continued development of the Syntroleum Process. When used in this document, the words "anticipate," "believe," "estimate," "expect," "intent," "may," "project," "plan" "should," and similar expressions are intended to be among the statements that identify forward-looking statements. Although Syntroleum believes that its expectations reflected in these forward-looking statements are reasonable, such statements involve risks and uncertainties and no assurance can be given that actual results will be consistent with these forward-looking statements. Important factors that could cause actual results to differ from these forward-looking statements include the potential that commercial-scale GTL plants will not achieve the same results as those demonstrated on a laboratory or pilot basis or that such plants will experience technological and mechanical problems, the potential that improvements to the Syntroleum Process currently under development may not be successful, the impact on plant economics of operating conditions (including energy prices), construction risks, risks associated with investments and operations in foreign countries, the ability to implement corporate strategies, competition, intellectual property risks, Syntroleum's ability to obtain financing and other risks described in the company's filings with the Securities and Exchange Commission.

* (R) "Syntroleum" is registered as a trademark and service mark in the U.S. Patent and Trademark Office.

Syntroleum Corporation

Syntroleum Corporation,

Marathon Oil Company,

http://http://www.Syntroleum.com

http://http://www.Marathon.com

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