1994 Chevrolet Corvette Owner's Manual - Page 174

buy a higher octane fuel to get ridof pinging. It's the heavy, constant knock Use premium unleaded gasoline ratedat that means you have a problem. 91 octane or higher.You may use middle grade or regular unleaded gasolines, but What about gasoline with blending materials that contain oxygen your vehicle may notaccelerate as well. (oxygenates), such as MTBE oralcohol? The gasolineyou use should meet MTBE is "methyl tertiary-butyl ether.'' specifications ASTM D4814 in the U.S. and CGSB 3.5-92 in Canada. These fuels Fuel that is no more than 15% MTBE is fine for your vehicle. should have the properadditives, so you should not have to add anything the to Ethanol is ethyl or grain alcohol. fuel. Properly-blended fuel that is no more than 10% ethanol is fine for your vehicle. In the U.S. and Canada, it's easy to be sure you get the right kindof gasoline Methanol is methyl or wood alcohol. (unleaded). You'll see "UNLEADED' right on the pump. And only unleaded NOTICE: nozzles will fit into your vehicle's filler neck. Fuel that is more than 5% methanol Be sure the posted octane for premium is is bad for your vehicle. Don't useit. at least 91 (at least 89 for middle grade It can corrode metal parts in your fuel and 87 for regular). If the octane is less system and also damage plastic and than 87, you may get a heavy knocking rubber parts. That damage wouldn't noise when you drive. If it's bad enough, be covered under your warranty. it can damage your engine. And even at 5% or less, there must If you're usingfuel rated at 91octane or be "cosolvents" and corrosion higher and you still hear heavyknocking, preventers in this fuelto help avoid your engine needs service. But don't these problems. worry if you hear a little pinging noise when you're accelerating ordriving up a hill. That's normal and you don't have to Fuel Gasolines for Cleaner Air Your use of gasoline with deposit control additives will help prevent deposits from forming in your engine and fuel system. That helps keep yourengine in tune and your emission control system working properly. It's good for your vehicle, and you'll be doing your partfor cleaner air. Many gasolines are now blended with oxygenates. General Motors recommends that you use gasolines withthese blending materials, such as MTBE and ethanol. By doing so, you can help clean the air, especially in those parts of the country that have high carbon monoxide levels. In addition, some gasoline suppliers are now producing reformulated gasolines. These gasolines are specially designed to reduce vehicle emissions. General Motors recommends that youuse reformulated gasoline. By doing so, you can help clean the air, especiallyin those parts of the country that have high ozone levels. You should ask your service station operators if their gasolines contain deposit control additives and oxygenates, and if they have been reformulated to reduce vehicle emissions. 173 ...