Chevrolet 2003 Corvette Owner's Manual page 243

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When to Add Engine Oil
If the oil is at or below the cross-hatched area at the tip
of the dipstick, you'll need to add at least one quart
of oil. But you must use the right kind. This part explains
what kind of oil to use. For engine oil crankcase
capacity, see Capacities and Specifications on
page 5-89.
See "Racing or Other Competitive Driving'' under
Starting
Your
Engine on page 2-21 for additional
information on engine oil.
Notices Don't add too much oil. If your engine has
so much oil that the oil level gets above the
upper mark that shows the proper Operating range,
your engine could be damaged.
The engine oil fill cap is
located in the engine
compartment on top of the
valve cover on the
passenger's side of the
vehicle. See Engine
Compartment Ovetvie w on
page 5- 12 for more
information on location.
Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you're through.
What Kind of Engine Oil to Use
Look
for
two things:
0
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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