1997 Pontiac Trans Sport Owner's Manual - Page 339

As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can useSAE 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. not use Do other viscosityoils, such as SAE 20W-50. Engine Oil Additives Don't add anythingto your oil. Your Pontiac dealer is ready to advise if you think something should added. be When to Change Engine Oil If any one of these istrue for you, use theshort tripkity maintenance schedule: a Most trips are less than 5 to 10 miles (8 to 16 km). NOTICE: Use only engine oil with the American Petroleum For Gasoline Engines Institute Certifled "Starburst" symbol. Failure use the to damage not recommended oilcan result in engine covered by your warranty. GM Goodwrench@ oil meets the requirements for all your vehicle. If you are in an area where the temperature below falls -20°F (-29"C), consider using either an SAE 5W-30 synthetic oilor an SAE OW-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. This is particularly important when outside temperatures are below freezing. Most trips include extensiveidling (such as frequent driving in stop-and-go traffic). Most tripsare through dusty areas. 0 You frequently tow a trailer use acarrier on top of or your vehicle. The vehicle is usedfor delivery service, police, taxi or other commercial application. 0 Driving under these conditions causes engine oil to break down sooner. If any one of these is true for your vehicle, then you need change youroil and filter to m or every 3,000 miles (5 000 k ) 3 months -- whichever occurs first. 6-14