1998 Oldsmobile Achieva Owner's Manual - Page 244

As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE 1 OW-30 if it's going numbers on an oil to be0"F (- 18 " C) or above. These container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. Engine Oil Additives Don't add anything to your oil. Your retailer is ready to advise if you think something should be added. When to Change Engine Oil If any one of these is true foryou, use the short triplcity maintenance schedule: e Most trips are less than 5 to 10 miles (8 to 16 km). 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 covered by your warranty. GM Goodwrench@oil meets all the requirements for your vehicle. This is particularly important when outside temperatures are below freezing. 0 Most trips include extensive idling (such as frequent driving in stop-and-go traffic). Most trips are through dusty areas. your vehicle. 0 e You frequently tow a trailer or use a carrier on top of 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 better protection and for your engine at extremely low temperatures. e The vehicle is used for delivery service, police, taxi or other commercial application. Driving under these conditions causes engine oil to break down sooner. If any one of these is true foryour vehicle, then you need to change your oil and filter every 3,000 miles ( 5 000 km) or 3 months -- whichever occurs first. 6-16