1993 Buick Skylark Owner's Manual - Page 227

RECOMMENDED SAE VlSCOSlTY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE O FOR THE EXPECTED TEMPERATURE RANGE. L I SAE 5W-30 (L4 2.3L L40 Engine) As shown in this viscosity chart, SAE 5W-30 is best for your vehicle. However, you can useS A E low-30 if it's going to be0 O F (-18 C) or above. These numbers on an oil container show its viscosity, or thickness. Energy Conserving I1 Oils with these words on the container will help you save fuel. This doughnut-shaped logo (symbol) is used on most oil containers to help you select the correct oil. FOR THIS LOOK HOT WEATHER @ 5W-30 LABEL "t'LcoNse94' IE 1OW-30 SAE 5W-30 PREFERRED COLD WEATHER 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). DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED You should look for this on the container, and use oil only those oils that display the logo. GM Goodwrench@ oil (in Canada, Engine Oil) GM meets all the requirements for your vehicle. Engine Oil Additives: Don't add anything to your oil. Your Buick dealer is readyto adviseif you think something should be added. When to Change Engine Oil: See if any one of these is true for you: Most trips are less than 4 miles (6 km). 1 226