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Answer to: What is MMT? MMT (Methylcylclopentadienyl Manganese Tricarbonyl) is fuel additive for unleaded gasoline. The additive, which is an octane enhancer known as MMT or HiTec 3000, is now in use in Canada and other parts of the world. The Ethyl Corp. requested a waiver from the EPA to permit the sale of MMT octane enhancer commercially labeled by Ethyl as HiTec 3000, for use in unleaded gasoline in July, 1991. The EPA denied the request and Ethyl sort judicial review of the EPA decision in the U.S. Court of Appeals. On July 13, 1994 the Court upheld the EPA decision based on: 1) That a risk assessment on manganese emissions associated with the use of MMT and determined that there are important unanswered questions about potential public health risks and health effects (Parkinson's syndrome) and exposure studies are needed. 2) That MMT adversely affects the performance of sophisticated emission diagnostic systems required on new cars. These controls are critical to protecting air quality. Ethyl has not given up on its appeal, and it is only a matter of time. Ethyl clam is that the product is safe and it will reduce the cost of gasoline by 2-3 cents/gal. I believe that this is a very important issue for the Parkinson's community and the general public health. Thanks, Bob ([log in to unmask])