1997 GMC Safari Owner's Manual - Page 260

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 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, gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to help clean the air. GeneralMotors recommends that you use these gasolines if they comply with thespecifications described earlier. Fuels in Foreign Countries If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to find. Never use leaded gasoline orany other fuelnot recommended in the previous text on fuel. Costly repairs caused by use of improper fuel wouldn't be covered by your warranty. To check on fuel availability, ask an auto club, or contact a major oil company that does business in the country where you'll be driving. You can also write us at the following address for advice. Just tell us where you're going and give your Vehicle Identification Number (VIN). General Motors International Product Center 1908 Colonel Sam Drive Oshawa, Ontario L l H 8P7 NOTICE: Your vehicle was not designed for fuel that contains methanol. Don't use it. can corrode It metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn't be covered under your warranty.