1998 Oldsmobile Aurora Owner's Manual - Page 256
1998 Oldsmobile Aurora Manual
Page 256 highlights
If your vehicle is certified to meet California Emission Standards (indicated on the underhood emission control label), it is designed to operateon fuels that meet California specifications. If such fuels are not available in statesadopting California emissionsstandards, your vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance may be affected. The malfunction indicator lamp on your instrument panel may turn on and/or your vehicle may fail a smog-check test. If this occurs, return to your authorized Aurora retailer for diagnosis to determine the cause of failure. Inthe event it is determined that the cause of the condition is the type of fuels used, repairs may not becovered by your warranty. Some gasolines that arenot reformulated for low emissions contain an 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 containingMMT are used, spark plug life 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, return to your authorized Aurora retailer for service. To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent deposits from forming in your engine and fuel system, allowing your emission control system to function properly. Therefore, you should not have to add anything to the fuel. In addition,gasolines . containing oxygenates, such as ethersand ethanol, and reformulated gasolines may be available in your area to help clean the air. General Motors recommends that you use these gasolines if they comply with the specifications described earlier. I NOTICE: Your vehicle was not designed fuel that for 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