1998 Cadillac Seville Owner's Manual - Page 279

If your vehicleis certified to meet California Emission To provide cleaner air, all gasolines the United States in Standards (indicated on the underhood emission control are now required to contain additives that will help label), it is designed to operate on fuels that meet prevent deposits from forming in your engine and fuel California specifications.If such fuels are not available system, allowing your emission control system to in states adopting California emissions standards, your function properly. Therefore, you should not have to add vehicle will operate satisfactorily on fuels meeting anything to the fuel. In addition, gasolines containing federal specifications, but emission control system oxygenates, such as ethers and ethanol, and performance may be affected.The malfunction indicator reformulated gasolines may be available in your area to lamp on your instrument panel may turn on and/or your help clean the air. General Motors recommends that you vehicle may fail a smog-check test. If this occurs, return use these gasolinesif they comply with the to your authorized Cadillac dealer diagnosis to for specifications described earlier. determine the cause failure. In the event is of it determined that the cause the condition is the type of of fuels used, repairs may not be covered by your warranty. NOTICE: I Some gasolines that are not reformulated for low emissions containan octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask your service station operator whether or not his fuel contains MMT. General Motors does not recommend the use of such gasolines.If fuels containing MMT are used, spark pluglife may be reduced and your emission control system performance may be affected. The malfunction indicator lamp on your instrument panel may turn on. If this occurs, returnto your authorized Cadillac dealerfor service. Your vehicle was not designed for fuel that contains methanol. Don't use It can corrode it. metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn't be covered under your warranty. 6-4