1998 Chevrolet Corvette Owner's Manual - Page 259

0 RECOMMENDED SAL VlSCOSlTT GRADE ENGINE OILS FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. SAE 5W-30 As shown in the viscosity chart, SAE 5W-30 is best SAE for your vehicle. However, you can use 1OW-30 if it's going to be 0°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 2OW-50. Oils meeting these requirements shouldalso have the "Starburst" symbol on the container. HOT WEATHER ' T C ) ~fi I + 20 0 , I WOK FOR THIS SYMBOL SAE 1OW-30 SAE SW-30 PREFERRED COLD WEATHER DO NOTUSESAE 2OW-50 OR ANYOTHER GRADE OIL NOT RECOMMENDED This symbol indicates that theoil has been certifiedby the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. 6-14