Chevrolet 2010 Corvette Owner's Manual page 324

These vehicles have a racetrack-ready dry sump engine
lubrication system. This high-performance system
operates differently than a standard engine lubrication
system and requires a special procedure when checking
the engine oil level. Follow this procedure closely
when checking the engine oil level.
The engine oil level must be checked when the engine
is warm. Cold oil level in the dry sump tank may not
indicate the actual amount of oil in the system.
With this system, engine oil is contained in an
external tank, separate from the engine. Under normal
operating conditions, the oil pan under the engine
does not store any oil. If the vehicle has been parked
for an extended period without the engine being started,
some oil will seep back into the oil pan, reducing the
amount of oil held in the dry sump tank and there
could be no engine oil at all showing on the dipstick.
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.
6-22
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.