1994 Cadillac Fleetwood Owner's Manual - Page 260

n and.youdon't have to buy a higher octane fuel to get rid of pinging. It's the heavy, constant knock that means you havea problem. What aboutgasoline with blending materials that contain oxygen (oxygenates), such as MTBE oralcohol? MTBE is "methyl tertiary-butyl ether.''Fuel that is no more than 15% MTBE is fine for your vehicle. Ethanol is ethylor grain alcohol. Properly-blended fuel that is no more than 10% ethanol is fine for your vehicle. Methanol is methyl or wood alcohol. NOTICE: Fuel that is more than 5% methanol is bad for your.vehicle. Don't.use it. It can corrode metal parts in your fuel system and also damage plastic and rubber.parts. That damage wouldn't be covered under your warranty. And even 5%or less, there must at he "cosolvents" and corrosion preventers in fuel to help this avoid these problems. Gasolinesfor Cleaner Air Your useof gasoline with deposit control additives will help prevent deposits from forming in your engine and fuel system. That helps.keep your engine in tune and your emission control system working properly. It's goodfor your vehicle,and you'll be doing your part for cleaner air. Many gasolines are now blended with oxygenates.General Motors recommends that you use gasolines with these 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 highcarbon 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 you use reformulated gasoline. By doing so, you can help clean the air, especially inthose parts of the country that have high ozone levels. 247