1997 GMC Safari Owner's Manual - Page 269

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BESTFUELECONOMYANDCOLDSTARTING,SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER I- [m COLD WEATHER SAL 5W-30 PREFERRED m- 1 As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE low-30 if it's going to be 0°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 20W-50. WOK FOR T I HS SYMBOL I NOTICE: ~- Use only engineoil with the American Petroleum Institute Certified For 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 oilor an SAE OW-30 oil. Both will provide easier cold starting better protection for your engine and at extremely low temperatures. SA€ 1OW-30 00 NOTUSESAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED