1998 Chevrolet Blazer Owner's Manual - Page 282
1998 Chevrolet Blazer Manual
Page 282 highlights
What Kind of Engine Oil to Use Oils recommendedfor your vehicle canbe identified by looking for the "Starburst" symbol. This symbol indicates that the oil has been certified the American by Petroleum Institute (API). Do not use any oilwhich does not carry this Starburst symbol. If you change your ownoil, be sure you use oil that has the Starburst symbol on the front of the oil container. RECOMMENDED SAE VlSCOSlN GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAL VlSCOSlN GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER /.Frl/) LOOK FOR T I H S SYMBOL -If you have your oil changed for you, be surethe oil put into your engine is American Petroleum Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shownin the following chart: SAE 1OW-30 i COLD WEATHER SAE 5W-30 PREFERRED DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 6-12