1993 Pontiac Grand Am Owner's Manual - Page 203

3 Gasolines for Cleaner Air Your use of gasoline with detergent additives willhelp prevent deposits from forming in yourengine and fuel system. That helps keep yourengine in tune and your emissioncontrol system working properly. It's good for your vehicle, and you'll be doing your part for cleaner air. Many gasolinesare now blended with materials called oxygenates.General Motors recommends thatyou use materials, gasolines with these blending 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 thatyou use reformulated gasoline. By doing so, you can help cleanthe air, especially in those parts of the country that have high ozone levels. You should ask your service station operators if their gasolines contain detergents and oxygenates, and if they have been reformulated to reduce vehicle emissions. Fuels in Foreign Countries If you plan on driving in another country outside the U.S. or Canada, unleaded fuel may be hard to find. Do not use leaded gasoline. you use If even one tankful, your emission controls won't work well or at all. With continuous use,spark plugs can get fouled, the exhaust system can corrode, and your engine oil can deteriorate quickly. Your vehicle's oxygen sensor will be damaged. All that means of costly repairs that wouldn't be covered by your warranty.