Chevrolet 2001 Corvette Owner's Manual page 283

What Kind of Engine Oil to Use
Look for two things:
D
GM4718M
Your vehicle's engine requires a special oil meeting
GM Standard GM4718M. Oils meeting this standard
may be identified as synthetic. However, not all
synthetic oils will meet this GM standard. You
should look for and use only an oil that meets
GM Standard GM4718M.
NOTICE:
If you use oils that don't have the GM4718M
Standard designation, you can cause engine
damage not covered by your warranty.
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