1998 Pontiac Trans Sport Owner's Manual - Page 343

As shown in the chart, SAE 5W-30 is best foryour vehicle. However, you can use SAE 1OW-30 if it's going to be 0°F (-1 8'C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 2OW-50, Engine Oil Additives Don't add anythng to your oil. Your dealer is ready to advise if you think something should be added. When to Change Engine Oil If any one of these is true for you, use the short tripkity maintenance schedule: 0 NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the recommended oil can result in engine damage not coveredby your warranty. - Mos'ttrips are less than 5 to 10 miles (8 to 14 kn. r) This is particularly important when outside temperatures are below freezing, Most trips include extensive idling (such as frequent driving in stop-and-go traffic). - Most trips are through dusty areas. GM Goodwrench' oil meets all the requirements €or your vehicle. You frequently tow a trailer or use a carrier on top of your vehicle. The vehicle is used for delivery service, police, taxi or other commercial application, Driving under these conditions causes engine oil to break dawn sooner. If any one of these istrue €or your vehicle, then you need to change your oil and filter every 3,000 miles (5 000 kaor 3 months -- whichever r) r 08ccurs first. If you are in an area where the temperature falls below -20°F (-29"C), consider using either an SAE 5W-30 synthetic oil or an SAE OW-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. 6-14