1997 Pontiac Bonneville Owner's Manual - Page 257

If your vehicle is certified to meet California Emission Standards (indicated on the underhood tune-up label), it is designed to operate on fuels that meet California specifications. If such fuels are not available in states adopting California emissions standards, your vehicle will operate satisfactorilyon fuels meeting federal specifications, but emission control system performance may be affected.The malfunction indicator lamp on your instrumentpanel may turn on and/or your vehicle may fail a smog-check test, If this occurs, return to your authorized Pontiac dealer for diagnosis to determine the cause of failure. In the event is determined that the it cause of the condition is the type of fuels used, repairs may not be covered by your warranty. Some gasolines that are not reformulated for low emissions contain an octan'e-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask your service station operator whether not his fuel or 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 onyour instrument panel may turn on. If this occurs, return to your authorized Pontiac dealer for service. To provide 'cleaner air, all gasolines in United States the are now requiredto contain additives that willhelp prevent deposits from forming in your engine and fuel system, allowing youremission control system to function properly. Therefore, you should not haveto add anything to the fuel. In addition, gasolines containing oxygenates, such asethers and ethanol, and reformulated gasolines maybe 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. NOTICE: 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 landeryour warranty.