Chevrolet 2011 Corvette Owner's Manual page 310

10-20 Vehicle Care
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 (ZO6,
ZR1, and Grand Sport).
Selecting the Right Engine Oil
Selecting the right engine oil
depends on both the proper oil
specification and viscosity grade:
Specification
Use and ask for engine oils with
the dexos certification mark. Oils
meeting the requirements of the
vehicle should have the dexos
certification mark on the container.
This certification mark indicates that
the oil has been approved to the
dexos specification.
This vehicle was filled at the factory
with dexos approved engine oil.
Notice: Use only engine oil
that is approved to the dexos
specification or an equivalent
engine oil of the appropriate
viscosity grade. Engine oils
approved to the dexos
specification will show the dexos
symbol on the container. Failure
to use the recommended engine
oil or equivalent can result in
engine damage not covered
by the vehicle warranty. If you
are unsure whether the oil
is approved to the dexos
specification, ask your service
provider.
It is recommended to use Mobil 1
engine oils that meet the
requirements of the dexos
specification.
Use of Substitute Engine Oils if
dexos is unavailable: In the event
that dexos approved engine oil is
not available at an oil change or
for maintaining proper oil level,
you may use substitute engine oil
displaying the API Starburst symbol
and of SAE 5W-30 viscosity grade.
Use of oils that do not meet the
dexos specification, however, may
result in reduced performance under
certain circumstances.
Viscosity Grade
SAE 5W-30 is the best viscosity
grade for the vehicle. Do not
use other viscosity oils such as
SAE 10W 30, 10W 40, or 20W-50.
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