GMC 2008 Envoy - Manual (Page 312)

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.
• 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
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).
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