1995 GMC Sonoma Owner's Manual - Page 228

You should also use the proper viscosity oil for your vehicle, as shown in the following chart: RECOMMENDED SAE VlSCOSlTV GRADE ENGINE OILS FOR BEST FUEL ECONOMV AND COLD STARTING, SELECT THE LOWEST SAE VlSCOSlTV GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER F + 100 LOOK FOR THIS SYMBOL + 80 + 60 + 40 + 20 0 SA€ 1OW-30 SAE 5W-30 PREFERRED \ IF NEITHER SAE 5W-30 NOR SAE low-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USED AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C). 1 6-10 1 COLD WEATHER DO NOT USE SAE 1OW-40, SAE 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 (-1 8OC) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50.