1995 GMC Jimmy Owner's Manual - Page 251

You should also use the proper viscosity oil for your vehicle, as shown in the following chart: RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FULL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER F tlOO LOOK FOR THIS SYMBOL C - - +3a - +27 -+16 -+4 +80 - +60 c +40 +20 - -7 0. - -18 SAE 1OW-30 IF NEITHER SAE 5W-30 NOR SAE 1OW-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USE0 AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C) DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED SAE 5W-30 PREFERRED COLD WEATHER 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