1997 Chevrolet Suburban Owner's Manual - Page 295
1997 Chevrolet Suburban Manual
Page 295 highlights
RECOMMENDED SAL VISCOSITY GRADE ENGINE OllS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAL WSCOS171 GRADE 011 FORTHEEXPECTEDTEMPERATURERANGE. As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE 1OW-30 if it's going to be0°F (- 18 "C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 2OW-50. HOT WEATHER iI \ I - NOTICE: Use only engine oil with the American Petroleum Institute CertifiedFor Gasoline Engines "Starburst" symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty. GM Goodwrench@ oil meets all the requirements for your vehicle. If you are in an area where the temperature falls below -20°F (-29"C), consider using either an SAE 5W-30 synthetic oil or an SAE OW-30 oil. Both will provide easier coldstarting and better protection for your engine at extremely low temperatures. DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED L SllE sw PREfERl WEATHER corn