1998 Cadillac Eldorado Owner's Manual - Page 284

octane fuel toget rid of pinging. It's the heavy, constant knock that means you have a problem. If your vehicle is certified to meet California Emission Standards (indicated on the underhood emission control label), itis designed to operate on fuels that meet California specifications. If such fuels are not available in states adopting California emissionsstandards, your vehicle will operate satisfactorilyon 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 Cadillac dealer for diagnosis to determine the cause of failure. In the event it is determined that the cause of the condition is type of the fuels used,repairs may not be covered by your warranty. Some gasolinesthat are 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 Motors does not recommend the use of such gasolines. If fuels containingMMT are used, spark plug lifemay be reduced and your emission control system performance may be affected. The on malfunction indicator lamp your instrument panel may turn on. If this occurs,return to your authorized Cadillac dealer 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 engineand fuel system, allowingyour emission controlsystem to function properly. Therefore, you should not have to add anything to the fuel. addition, gasolinescontaining In oxygenates, such as ethers and 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 can contains methanol. Don't use it. It corrode metal parts in your fuel system and damage also plastic and rubber parts. That damage wouldn't be covered under your warranty. 6-4