GMC 2007 Envoy - Manual (Page 429)

How to Check Lubricant
To get an accurate
reading, the vehicle
should be on a
level surface.
If the level is below the bottom of the filler plug
hole, you’ll need to add some lubricant. Add
enough lubricant to raise the level to the bottom of
the filler plug hole. Use care not to overtighten
the plug.
What to Use
To determine what kind of lubricant to use, see
Recommended Fluids and Lubricants on page 517.
Front Axle
When to Check Lubricant
It is not necessary to regularly check front axle
fluid unless you suspect there is a leak or you hear
an unusual noise. A fluid loss could indicate a
problem. Have it inspected and repaired.
How to Check Lubricant
To get an accurate reading, the vehicle should be
on a level surface.
429