1995 GMC Safari Owner's Manual - Page 217

You should also use the proper viscosity oil for your vehicle, as shown in the following chart: RECOMMENDED SAL VISCOSITY GRADE ENGINE OS L I FOR BEST FUEL ECONOMY AND COUl STARTING, SELECT THE LOWEST SAL UlSCOSRY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER LOOK FOR THIS SYMBOL - low-130 SAE SAE sw-30 PREFERRED I COLD WEATHER IF NEITHER SAE 5W-30 NOR SAE IOW-30 GRADE OILS ARE AVAILABLE, SA€ 30 GRADE MAY BE USED AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C) DO NOT USE SA€ 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 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 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. 6- 11