1995 Buick Park Avenue Owner's Manual - Page 225

But don't worry if you hear a little pinging noise when you're accelerating or driving a hill. That's normal up and you don't have to buy a higher octane fuel to get rid of pinging. It's the heavy, constant knock that means you have a problem. What about gasoline with blending materials that contain oxygen (oxygenates), such as MTBE or alcohol? Gasolines for Cleaner Air Your use of gasoline with deposit controladditives 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 good for your vehicle, and you'll be doing your part for cleaner air. Many gasolines arenow 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 countrythat have high carbon monoxide levels. In addition, some gasoline suppliers are now producing reformulated gasolines. These gasolines are specially designed to reducevehicle emissions. General Motors recommends that you use reformulated gasoline. By doing so, you can help clean the air, especially in those parts of the country that have high ozone levels. You should askyour service station operators their if gasolines contain deposit control additives and oxygenates, and if they have been reformulated to reduce vehicle emissions. MTBE is "methyl tertiary-butyl ether." Fuel that is no more than 15% MTBE is fine for your vehicle. Ethanol is ethyl or 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 than5% methanol is bad for it. your vehicle. Don't use It can corrode metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn't be 5% covered under your warranty. And even at or less, there must be "cosolvents" and corrosion preventers in this fuel to help avoid these problems. 6-5