Chevrolet Silverado Classic 2007 Owner's Manual page 488

What Kind of Engine Oil to Use
Look for three things:
•
GM6094M
Your vehicle's engine requires oil meeting GM
Standard GM6094M. Look for and use only
an oil that meets GM Standard GM6094M.
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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.
•
American Petroleum Institute (API) starburst
symbol
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.
Oils meeting these
requirements should
have the starburst
symbol on the container.
This symbol indicates
that the oil has
been certified by the
American Petroleum
Institute (API).