1993 Buick Roadmaster Owner's Manual - Page 246

Your use of gasoline with detergent additives will help fuel prevent deposits from forming in your engine:and MTBE is "methyl tertiary-butyl ether." Fuel that no is, system. That helps keep your ,engine tune and your in. more than 15% MTBE isfine for your vehicle. emission control system working properly. It's good for Ethanol is ethyl or .grain alcohol. Properly-blended fuel your vehicle, and you'll be doing your for cleaner part that is no more than 10% ethanol is fine for your air. vehicle. Many gasolines are now blended with materials called Methanol is methyl or wood alcohol. oxygenates. General Motors .recommends that you use gasolines with these blending materials, such MTBE as and-ethanol.By doing so, you can help clean the ak, especially in those parts the country that have of high carbon monoxide levels. In addition, som-e gasoline suppliers are .producing now reforniulated 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 air, especiallyin those the parts of the country that have high ozone levels. You should ask your service station operators their if if gasolines contain detergents and oxygenates, andthey have been reformulated to reduce vehicle emissions. What about gasoline with blending materials that contain oxygen, suchas MTBE or alcohol? Gasolines for Cleaner Air .