GMC 2007 Envoy Denali Owner's Manual page 396

What Kind of Engine Oil to Use
396
Look for two things:
•
GM6094M
Your vehicle's engine requires oil meeting
GM Standard GM6094M. You should 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.