GMC 2012 Sierra Denali Owner's Manual page 347

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 on page 11 12.
Specification
Use and ask for licensed engine oils
with the dexos1 approved
certification mark. Engine oils
meeting the requirements for the
vehicle should have the dexos 1
approved certification mark. This
certification mark indicates that the
oil has been approved to the dexos1
specification.
Notice: Failure to use the
recommended engine oil or
equivalent can result in engine
damage not covered by the
vehicle warranty. Check with your
dealer or service provider on
whether the oil is approved to the
dexos1 specification.
Viscosity Grade
SAE 5W 30 is the best viscosity
grade for the vehicle. Do not use
other viscosity grade oils such as
SAE 10W 30, 10W 40, or 20W 50.
Vehicle Care
If in an area of extreme cold, where
the temperature falls below 20°F
( 29°C), an SAE 0W 30 oil should
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, always select an oil that
meets the dexos1 specification or
equivalent. See Specification for
more information.
Engine Oil Additives/Engine
Oil Flushes
Do not add anything to the oil. The
recommended oils with the dexos
specification and displaying the
dexos certification mark are all that
is needed for good performance and
engine protection.
Engine oil system flushes are not
recommended and could cause
engine damage not covered by the
vehicle warranty.
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