GMC 2005 Sierra 1500 Pickup, Owner'S Manual, Page: 416 / 574

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SAE 5W-30
As shown in the viscosity chart, SAE 5W-30 is best
for your vehicle.
These numbers on an oil container show its
viscosity, or thickness. Do not use other viscosity
oils such as SAE 20W-50.
Oils meeting these
requirements should also
have the starburst
symbol on the container.
This symbol indicates
that the oil has been
certified by the American
Petroleum Institute (API).
You should look for this information on the oil container,
and use only those oils that are identified as meeting
GM Standard GM6094M and have the starburst symbol
on the front of the oil container.
Notice: Use only engine oil identified as meeting GM
Standard GM6094M and showing the American
Petroleum Institute Certified For Gasoline Engines
starburst symbol. Failure to use the recommended oil
can result in engine damage not covered by
your warranty.
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