Hummer 2007 H3 - Manual (Page 358)

The proper level is from 0 to 3/8 inch (0 mm to
10 mm) below the bottom of the filler plug
hole, located on the rear axle.
What to Use
See Recommended Fluids and Lubricants on
page 440 to determine which kind of lubricant
to use.
Four-Wheel Drive
It is recommended that the four-wheel drive
transfer case fluid be checked and filled by
your dealer.
Front Axle
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.
It is recommended that the front axle fluid be
checked and filled by your dealer.
Headlamp Aiming
The vehicle has a visual optical headlamp aiming
system. The aim has been preset at the factory
and should need no further adjustment.
However, if the vehicle is damaged in an accident,
the headlamp aim may be affected and adjustment
may be necessary.
If oncoming vehicles flash their high beams at
you, this may also mean the vertical aim needs to
be adjusted.
It is recommended that the vehicle is taken to your
dealer for service if the headlamps need to be
re-aimed. It is possible however, to re-aim
the headlamps as described in the following
procedure.
358