1996 Chevrolet Corvette Owner's Manual - Page 244

SAE5W-30 As shown in the viscosity chart, SAE 5W-30 is best for your vehicle. However, you use SAE can 1OW-30 if it's going to 0°F (-18°C) or above. be These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50. Oils meeting these requirements should also have the "Starburst" symbol onthe container. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. You should look for this onthe oilcontainer, and use only those oils that are identified as meeting GM Standard GM4718M and have the Starburst symbol on the frontof the oil container. Your Corvette engineis filled at the factory with a Mobil 1 synthetic oil, which meets all requirements for your vehicle. @ Substitute Oil:When adding oil to maintain engine oil level, oil meeting GM Standard GM47 18M may not be available. You can add substitute oil designated SAE 5W-30 with the "Starburst" symbol at all temperatures. If temperatures are above 0"F (- 18" C), you may substitute SAE 1OW-30 with the "Starburst" symbol. Substitute oil not meeting GM Standard GM47 18M should not be usedfor an oil change. Engine Oil Additives Don't add anything to your oil. Your Corvette dealer is ready to advise if you think something should be added. 6-13