1995 GMC Yukon Owner's Manual - Page 299

You should also use the proper viscosity oil for your vehicle, as shown in the following chart: LIGHT DUTY EMISSIONS - GASOLINE ENGINES I + 100 + 80 RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS ~ ~ ~ ~ _ _ _ _ ~ ____ FOR BEST FUEL ECONOMY ANDCOLD STARTING, SELECTTHE LOWEST SAE VlSCOSiTY GRADE 011 FOR THE EXPECTED TEMPERATURE RANGE. . - - ~.~ __ r; + 60 + 40 HOT WEATHER + 38 + 27 + 16 +4 LOOK FOR THtS SYMBOL + 20 0 -7 - 18 SAE 5W-30 PREFERRED SAE i! I 1OW- -30 COLD DO NOTUSE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 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 (-1 8OC) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 2OW-50. 6-1 7