GMC 2013 Sierra Denali Owner's Manual page 338

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Refer to
to determine when to
check the lubricant.
A. Fill Plug
B. Drain Plug
To get an accurate reading, the
vehicle should be on a level
surface.
If the level is below the bottom of
the fill plug hole, located on the
transfer case, some lubricant will
need to be added. Add enough
lubricant to raise the level to the
bottom of the fill plug hole. Use care
not to overtighten the plug.
Refer to
to determine how often to
change the lubricant.
Refer to
determine what kind of lubricant
to use.
It is not necessary to regularly
check the front axle fluid unless
there is a leak suspected or an
unusual noise is heard. A fluid loss
could indicate a problem. Have it
inspected and repaired by your
dealer.
The following information relates to
compliance with federal noise
emission standards for vehicles with
a Gross Vehicle Weight Rating
(GVWR) of more than 4 536 kg
(10,000 lbs). The noise control
system warranty is given in your
warranty booklet.
These standards apply only to
vehicles sold in the United States.
Federal law prohibits the following
acts or the causing thereof:
to
1. The removal or rendering
inoperative by any person, other
than for purposes of
maintenance, repair or
replacement, of any device or
element of design incorporated
into any new vehicle for the
purpose of noise control, prior to
its sale or delivery to the ultimate
purchaser or while it is in use; or

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