1998 Cadillac DeVille Owner's Manual - Page 291

octane fuel to get ridof pinging. It's the heavy, constant knock that means you have a problem. If your vehicleis certified to meet California Emission Standards (indicated on the underhood emission control To provide cleaner air, all gasolines in the United States 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 performance may be affected. The malfunction indicator oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to on andor your lamp on your instrument panel may turn vehicle mayfail a smog-check test.If this occurs, return help clean the air. General Motors recommends that you use these gasolines they comply with the if to your authorized Cadillac dealer diagnosis to for specifications described earlier. determine the cause of failure. In the event it is determined that the cause the condition is the type of of fuels used, repairs may not be covered by your warranty. malfunction indicator lamp on your instrument panel may turn on. If this occurs, return to your authorized Cadillac dealerfor service. Some gasolines thatare not 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 Motorsdoes not recommend the use .ofsuch gasolines.If fuels containing MMT are used, spark pluglife may be reduced and your emission control system performance may affected. The be NOTICE: Your vehicle was not designed fuel that for contains methanol. 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. 6-4