Chevrolet Corvette Owner's Manual page 221

220 Vehicle Care
7. Install the oil fill cap and insert
the dipstick, if removed.
8. Start the engine and let it run
at idle for at least 15 seconds.
This will circulate the fresh
engine oil through the
lubrication system.
9. Shut off the engine and check
the oil level as described under
"Checking Engine Oil."
Selecting the Right Engine Oil
Selecting the right engine oil
depends on both the proper oil
specification and viscosity grade.
See Recommended Fluids and
Lubricants 0 297.
Specification
Ask for and use engine oils that
meet the dexos2 specification.
Engine oils that have been
approved by GM as meeting the
dexos2 specification are marked
with the dexos2 approved logo.
GM recommends Mobil 1 engine
oils that show the dexos
approved logo.
Use of Substitute Engine Oils if
dexos2 is unavailable: In the event
that dexos2-approved engine oil is
not available at an oil change or for
maintaining proper oil level, you
may use substitute engine oil that
meets ACEA C3 of the appropriate
viscosity grade.
Caution
Use only engine oil that is
approved to the dexos2
specification or equivalent engine
oil as defined in the preceding
paragraph. Failure to use the
recommended engine oil can
result in engine damage not
covered by the vehicle warranty.
Viscosity Grade
Use SAE 5W-30 viscosity grade
engine oil.
Cold Temperature Operation: In an
area of extreme cold, where the
temperature falls below 29 °C
( 20 °F), an SAE 0W-30 oil may be
used. An oil of this viscosity grade
will provide easier cold starting for
the engine at extremely low
temperatures. When selecting an oil
of the appropriate viscosity grade, it
is recommended to select an oil of
the correct specification. See
"Specification" earlier in this section
for more information.
For track events or competitive
driving, Mobil 1 15W-50 engine oil is
recommended. A Driver Information
Centre (DIC) message will display
at high oil temperatures.
Engine Oil Additives/Engine
Oil Flushes
Do not add anything to the oil. The
recommended oils meeting the
dexos2 specification are all that is
needed for good performance and
engine protection.