Chevrolet TrailBlazer 2007 Owner's Manual page 400

What Kind of Engine Oil to Use
Except Vehicles with 6.0L V8 (VIN Code H)
Engine
400
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.