1998 Chevrolet Blazer Owner's Manual - Page 283

As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE 1OW-30 if it's going to be 0"F (- 18O C) or above. These numbers on anoil container show its viscosity, or thickness. Do not use other viscosity oils, such as S A E 20W-50. When to Change EngineOil If any one of these is true foryou, use the short tripkity maintenance schedule: 0 Most trips are less than 5 to 10 miles (8 to 16 km). 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). 0 You operate your vehicle in dusty areas or off-road frequently. 0 You frequently tow a trailer or uSe a carrier on top of your vehicle. 0 The vehicle is used for delivery service, police, taxi or other commercial application. Driving under these conditions causes engine oil to break down sooner. any one of these is true for your If vehicle, then you needto change your oil and filter every 3,000 miles (5 000 k ) 3 months -- whichever m or occurs first. If none of them is true, use the long triphighway maintenance schedule. Change the oil and filter every 7,500 miles (12 500 k ) 12 months -- whichever m or occurs first. Driving a vehicle with a fully warmed engine under highway conditions causes engine oil to break down slower. 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. 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 lowtemperatures. Engine Oil Additives Don't add anything to your oil. Your dealer is ready to advise if you think something should be added. 6-13