1998 Chevrolet Astro Owner's Manual - Page 275

I I RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VlSCOSlTT GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE, As shown in the chart, SAE 5W-30 is best for your vehicle. However, you can use SAE low-30 if it's going to be0°F (- 18"C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. HOT WEATHER / O F LOOK FOR T I H S SYMBOL OC) 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. + 100 +BO- - - +38 - +27 +80- - +16 +40- -+4 +20---7 0---18 r 1-30 REO / COLD WEATHER DO NOT USE SAE 2OW-50 OR AMY OTHER GRADE OIL NOT RECOMMENDED 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 protectionfor your engine at extremely low temperatures. L 6-13