GMC 2008 Canyon - Manual (Page 309)

When the differential is cold, add enough lubricant
to raise the level to 1/2 inch (12 mm) below the
filler plug hole.
When the differential is at operating temperature
(warm), add enough lubricant to raise the level
to the bottom of the filler plug hole.
What to Use
See Recommended Fluids and Lubricants on page 6-12
to determine what kind of lubricant to use.
Headlamp Aiming
Headlamp aim has been preset at the factory and
should need no further adjustment.
However, if your vehicle is damaged in a crash,
the headlamp aim may be affected. Aim adjustment
to the low-beam headlamps may be necessary if
oncoming drivers flash their high-beam headlamps
at you (for vertical aim).
If the headlamps need to be re-aimed, it is
recommended that you take the vehicle to your
dealer/retailer for service.
Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 5-53.
For any bulb changing procedure not listed in this
section, contact your dealer/retailer.
Halogen Bulbs
{ CAUTION:
Halogen bulbs have pressurized gas inside and
can burst if you drop or scratch the bulb. You
or others could be injured. Be sure to read and
follow the instructions on the bulb package.
5-49