1993 Oldsmobile Bravada Owner's Manual - Page 213

What Kind of Oil to Use Look for Three Things: SG "SG" must be on the oil container, either by itself or combined with other quality designations, such as "SGICC," "SGICD," "SF, SG, CC," etc. These letters show American Petroleum Institute (API) levels of quality... I SAE 5W-30 As shown in the viscosity 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 1OW-40 or SAE 20W-50. Energy Conserving II 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. You should look for this on the oil container, and use only those oils that display the logo. GM Goodwrench@ (in Canada, GM Oil Engine Oil) meets all the requirements for your vehicle.