1998 Buick Riviera Owner's Manual

Some gasolines that are not reformulated for lowemissions contain an octane-enhancing additive calledmethylcyclopentadienyl manganese tricarbonyl (MMT);ask your service station operator whether or not his fuelcontains MMT. General Motors does not recommend theuse of such gasolines. If fuels containing MMT are used,spark plug life may be reduced and your emissioncontrol system performance may be affected. Themalfunction indicator lamp on your instrument panelmay turn on. If this occurs, return to your authorizedBuick dealer for service.To provide cleaner air, all gasolines in the United Statesare now required to contain additives that will helpprevent deposits from forming in your engine and fuelsystem, allowing your emission control system tofunction properly. Therefore, you should not have toadd anything to the fuel. In addition, gasolinescontaining oxygenates, such as ethers and ethanol, andreformulated gasolines may be available in your area tohelp clean the air. General Motors recommends that youuse these gasolines if they comply with thespecifications described earlier.6-4NOTICE:Your vehicle was not designed for fuel thatcontains methanol. Don’t use it. It can corrodemetal parts in your fuel system and also damageplastic and rubber parts. That damage wouldn’tbe covered under your warranty.Fuels in Foreign CountriesIf you plan on driving in another country outside the UnitedStates or Canada, the proper fuel may be hard to find. Neuse leaded gasoline or any other fuel not recommended in theprevious text on fuel. Costly repairs caused by use ofimproper fuel wouldn’t be covered by your warranty.To check on fuel availability, ask an auto club, orcontact a major oil company that does business in thecountry where you’ll be driving.You can also write us at the following address foradvice. Just tell us where you’re going and give yourVehicle Identification Number (VIN).General Motors Overseas Distribution Corporation1908 Colonel Sam DriveOshawa, Ontario LlH 8P7