Chevrolet 2011 Corvette Coupe Owner's Manual page 308

10-18 Vehicle Care
This is normal since the dipstick is
designed to read engine oil level
only after the engine has run long
enough to reach normal operating
temperature. Do not add engine
oil based on cold engine dipstick
readings. The engine oil level on the
dipstick will also be inaccurate if
checked while the engine is running.
1. To obtain an accurate engine oil
level reading, warm up the
engine to at least 80°C (175°F).
Cold oil will not give a correct oil
level reading.
2. Once the engine is warm, turn
off the engine. Checking the oil
while the engine is running will
result in an incorrect oil level
reading.
3. Wait at least five minutes (but
not more than 20 minutes) to
allow oil to drain and settle in
the engine.
4. Remove the dipstick from the
external engine oil tank and
clean it with a lint free paper
towel or a cloth. Re insert the
dipstick into the external oil tank,
pushing it all the way in until it
stops.
5. Remove the dipstick from the oil
tank and read the level on the
cross hatched area. Oil levels
that fall in the cross hatched
area are normal.
When to Add Engine Oil (ZO6,
ZR1, and Grand Sport)
If the oil is below the cross-hatched
area at the tip of the dipstick, add
1 L (1 qt) of the recommended oil
through the oil fill cap opening in the
oil tank and then recheck the level.
See Selecting the Right Engine Oil
for an explanation of what kind of oil
to use. For engine oil crankcase
capacity, see
See
for additional
information on engine oil.
Do not add too much
oil. Oil levels above or below
the acceptable operating range
shown on the dipstick are harmful
to the engine. If you find that
you have an oil level above the
operating range, i.e., 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. You should drain
out the excess oil or limit driving
of the vehicle and seek a service
professional to remove the
excess amount of oil.
.