1997 Chevrolet Blazer Owner's Manual - Page 266

SAL VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AN0 COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THL'EXPECTEDTEMPERATURE RANGE. 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 (- 18 " C )or above. Thesenumbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. HOT WEATHER LOOK FOR T I H S SYMBOL I 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. '-. - -l COLD WEATHER DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED If you are in an area where the temperature falls below -20°F (-29OC), consider using either an SAE 5W-30 synthetic oil or an SAE OW-30 oil. Both will provide easier cold startingand better protection for your engine at extremely low temperatures. 6-11