1995 Chevrolet Blazer Owner's Manual - Page 252

I NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the proper oil can result in engine damage not covered by your warranty. GM Goodwrench@oil (in Canada, GM Engine Oil) meets all the requirements for your vehicle. Engine Oil Additives Don't add anything to your oil. GM dealer is ready to advise you Your if think something should be added. When to Change Engine Oil See if any one of these is true you: for 0 Most trips are less than to 10 miles (8 to 16 km). This is particularly 5 important when outside temperatures are below freezing. Most trips include extensive idling (such frequent driving in stop and as go traffic). 0 You operate your vehiclein dusty areas or off-road frequently. You frequently tow a trailer or use a carrier on top of your vehicle. 0 If any one of these is true your vehicle, then you need to change your for oil and filter every 3,000 miles (5 000 km) 3 months - whichever comes or first. If none of them is true, change the oil and filter every 7,500 miles (12 500 km) or 12 months - whichever comes first. 6-12