1995 Buick Skylark Owner's Manual - Page 204

What about gasoline with blending materials that contain oxygen (oxygenates), such as MTBEor alcohol? Gasolines for Cleaner Air Your use of gasoline with deposit control additives will help prevent deposits from forming in yourengine 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 are now blended withoxygenates. 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 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 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 ask yourservice station operators if their gasolines contain deposit control additives and oxygenates, and if they have been refomulated to reduce vehicle emissions. MTBE is "methyl tertiary-butyl ether." Fuel that is no more than 15%MTBE is fine foryour vehicle. Ethunol is ethylor grain alcohol. Properly-blended fuel that is nomore than 10%ethanol is fine foryour vehicle. Methanol is methyl or wood alcohol. I NOTICE: Fuel thatis 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 at less, there must be "cosolvents" and corrosion preventers in this fuel to help avoid these problems. 6-3