Chevrolet 2007 Corvette Owner's Manual page 336

When to Add Engine Oil (Except Z06)
If the oil is below the cross-hatched area at the
tip of the dipstick, you need to add at least
one quart/liter of oil. But you must use the right
kind. This section explains what kind of oil to use.
For engine oil crankcase capacity, see Capacities
and Specifications on page 426.
See Racing or Other Competitive Driving on
page 292 for additional information on engine oil.
Notice: Do not add too much oil. If the
engine has so much oil that the oil level
gets above the cross-hatched area that
shows the proper operating range, the
engine could be damaged.
336
Be sure to add enough oil to put the level
somewhere in the proper operating range.
Push the dipstick all the way back in when
you are through.
See Engine
Compartment Overview
on page 330 for
the location of the
engine oil fill cap.