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GASOLINE ADDITIVES TO KEEP ENGINES CLEANER

 FAIRFAX, Va., May 27 /PRNewswire/ -- To function at its best, the human heart needs clean arteries. Keeping them clean takes proper diet and regular exercise. Today's complex car engines demand similar care.
 As deposits in human arteries can cause harm, deposits that build up in a car engine's working parts can be harmful, too.
 Take carbon build-up, for example. Carbon is a by-product of the engine's combustion process. Too much build-up can clog fuel injectors and lead to deposits in other parts of the engine such as intake valves and combustion chambers. In the intake system and the combustion chamber, deposits can upset the air/fuel ratio, cause engine knock, power loss, cold start stalls and hesitation during acceleration.
 These carbon deposits can also lead to higher exhaust emissions -- an important point now that the oil and auto industries are addressing stronger federal clean air requirements.
 "Deposits affect driveability by altering our ability to control air/fuel ratios in the engine," says Dr. James Spearot, head of the Fuels and Lubricant Department for General Motors' North American Operations Research & Development Center. "Deposits in the intake system and combustion chamber can increase hydrocarbon and carbon monoxide emissions. One theory is that deposits absorb hydrocarbons, and those that don't burn efficiently eventually come out in the exhaust."
 Gasoline detergent additives help limit deposit formation and help keep the engine cleaner and newer, according to Dr. Spearot.
 In compliance with the federal Clean Air Act, the U.S. Environmental Protection Agency (EPA) has proposed rules to require the oil industry to sell detergent gasoline by 1995 that prevents deposit accumulation in engines and fuel supply systems. The EPA is also considering a keep- clean requirement for combustion chambers.
 To help meet the new requirements, the oil industry has improved detergent additives in gasoline. Mobil, which has long promoted its detergent gasolines, recently introduced a new synthetic detergent additive to address problems cited by auto builders -- carbon deposits on piston tops and cylinder heads.
 Michael J. McNally, a research engineer at Mobil's automotive research lab in Paulsboro, N.J., says Mobil's new additive is specially formulated to keep combustion chambers cleaner, which provides several benefits. "Reduced combustion mychamber deposits mean reduced engine knock, less power loss and fewer emissions," McNally notes.
 Like the human heart, today's complex car engine needs proper diet and careful maintenance to keep functioning at its best.
 -0- 5/27/93
 /CONTACT: Don Turk of Mobil, 703-849-6558/


CO: Mobil Corporation ST: Virginia, New Jersey IN: AUT SU: PDT

SM -- NYFNS3 -- 2728 05/27/93 07:32 EDT
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Publication:PR Newswire
Date:May 27, 1993
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