The following information appears in the General Motors Owner's Manual for this vehicle.

Use regular unleaded gasoline rated at 87 octane or higher. However, for best performance and for trailer towing, you may wish to use middle grade or premium unleaded gasoline.

It is recommended that the gasoline meet specifications which were developed by the American Automobile Manufacturers Association (AAMA) and endorsed by the Canadian Motor Vehicle Manufacturers Association for better vehicle performance and engine protection. Gasoline meeting the AAMA specification could provide improved driveability and emission control system protection compared to other gasoline.

Be sure the posted octane for premium is at least 87 (at least 91 for premium). If the octane is less than 87, you may get a heavy knocking noise when you drive. If the knocking is bad enough, the knocking can damage your engine.

If you are using fuel rated at the recommended octane or higher and you hear heavy knocking, your engine needs service. But do not worry if you hear a little pinging noise when you are accelerating or driving up a hill. That is normal, and you do not have to buy a higher octane fuel to get rid of pinging. A heavy, constant knock means you have a problem.

If your vehicle is certified to meet California Emission Standards (indicated on the underhood emission control label), your vehicle 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 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. See "Malfunction Indicator Lamp" in the Index. If this occurs, return to your authorized Vehicle dealer for diagnosis to determine the cause of failure. In the event the cause of the condition is the type of fuels used, repairs may not be covered by your warranty.

Some gasoline that are not reformulated for low emissions may contain an octane-enhancing additive called methylcyclopentadlenyl manganese tricarbonyl (MMT). Ask your service station operator whether or not this fuel contains MMT. General Motors does not recommend the use of such gasoline. If fuels containing MMT 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 Cadillac dealer for service.

To provide cleaner air, all gasoline 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, gasoline containing oxygenates, such as ethers and ethanol, and reformulated gasoline may be available in your area to contribute to clean air. General Motors recommends that you use these gasoline, particularly if they comply with the specifications described earlier.

Notice: Your vehicle was not designed for fuel that contains methanol. Do not use methanol fuel which can corrode metal parts in your fuel system and also damage plastic and rubber parts. This kind of damage would not be covered under your warranty.