1995 GMC Yukon Owner's Manual - Page 300

HEAVY DUTY EMISSIONS - GASOLINE ENGINES RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS ~~ ~ ~~ ~ FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE O FOR THE EXPECTED TEMPERATURE RANGE. I L HOT WEATHER rl LOOK FOR THIS SYMBOL - I li .- SAE IOW-30 PREFERRED above 0°F (-1 8°C) SA€ 5W-30 COLD WEATHER DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED As shown in the chart, SAE 1OW-30 is best for your vehicle. However, you can use SAE 5W-30 if it's going to be colder than 60°F (16°C) before your next oil change. When it's very cold, you should use SAE SW-30. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. 6-18