1994 Cadillac DeVille Owner's Manual - Page 263

not occur.) If you're using91 or higher octane unleadedgas and you still get heavy knocking, your engine needs service. What aboutgasoline withblending materials that contain oxygen (oxygenates), suchas MTBE or alcohol? MTBE is "methyl tertiary-butyl ether." Fuel that is no more than 15% MTBE is fine foryour Cadillac. Ethanol is ethyl or grain alcohol. Properly-blended fuel that is no more than 10% ethanol is fine foryour Cadillac. I Methanol is methyl or wood alcohol. NOTICE: Fuel thatis more than5%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 be "cosolvents" and corrosion preventers this fuel to help in avoid these problems. Gasolinesfor 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 emissioncontrol system workingproperly. It's goodfor your vehicle,and you'll be doing yourpart 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 partsof the country that have high carbon monoxide levels. In addition,some gasoline suppliers are now producing reformulated gasolines. These gasolines are specially designed to reducevehicle emissions. General Motorsreco.mmends 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. 250