AdditivesTo provide cleaner air, all gasolines in the United Statesare now required to contain additives that will helpprevent engine and fuel system deposits from forming,allowing your emission control system to workproperly. You should not have to add anything to yourfuel. However, some gasolines contain only theminimum amount of additive required to meet U.S.Environmental Protection Agency regulations. GeneralMotors recommends that you buy gasolines thatare advertised to help keep fuel injectors and intakevalves clean. If your vehicle experiences problems dueto dirty injectors or valves, try a different brand ofgasoline.Gasolines containing oxygenates, such as ethers andethanol, and reformulated gasolines may be available inyour area to contribute to clean air. General Motorsrecommends that you use these gasolines, particularly ifthey comply with the specifications described earlier.Notice: Your vehicle was not designed for fuel thatcontains methanol. Do not use fuel containingmethanol. It can corrode metal parts in your fuelsystem and also damage the plastic and rubberparts. That damage would not be covered underyour warranty.Some gasolines that are not reformulated for lowemissions may contain an octane-enhancing additivecalled methylcyclopentadienyl manganesetricarbonyl (MMT); ask the attendant where you buygasoline whether the fuel contains MMT. General Motorsdoes not recommend the use of such gasolines.Fuels containing MMT can reduce the life of spark plugsand the performance of the emission control systemmay be affected. The malfunction indicator lampmay turn on. If this occurs, return to your authorized GMdealer for service.Fuels in Foreign CountriesIf you plan on driving in another country outside theUnited States or Canada, the proper fuel may be hardto find. Never use leaded gasoline or any other fuelnot recommended in the previous text on fuel. Costlyrepairs caused by use of improper fuel would notbe covered by your warranty.To check the fuel availability, ask an auto club, orcontact a major oil company that does business in thecountry where you will be driving.5-7
