GMC 2010 Sierra Denali Owner's Manual page 500

Fluids visual leak check (or every 12 months,
whichever occurs first). A leak in any system must
be repaired and the fluid level checked.
Engine air cleaner filter inspection (vehicles driven
in dusty conditions only). See Engine Air
Cleaner/Filter on page 6 22.
Brake system inspection (or every 12 months,
whichever occurs first).
Maintenance
Perform all services described in Maintenance .
Steering and suspension inspection. Visual
inspection for damaged, loose, or missing parts or
signs of wear.
Lubricate the front suspension, steering linkage,
and parking brake cable guides. Control arm ball
joints are maintenance free.
Engine cooling system inspection. Visual
inspection of hoses, pipes, fittings, and clamps and
replacement, if needed.
Windshield wiper blade inspection for wear,
cracking, or contamination and windshield and
wiper blade cleaning, if contaminated. See
Windshield and Wiper Blades on page 6 110. Worn
or damaged wiper blade replacement. See
Windshield Wiper Blade Replacement on
page 6 61.
7-4
Body hinges and latches, key lock cylinders,
folding seat hardware, and liftgate hinges, linkage,
and handle pivot points lubrication. See
Recommended Fluids and Lubricants on
page 7 11. More frequent lubrication may be
required when vehicle is exposed to a corrosive
environment. Applying silicone grease on
weatherstrips with a clean cloth makes them last
longer, seal better, and not stick or squeak.
Restraint system component check. See Checking
the Restraint Systems on page 2 73.
Automatic transmission fluid level check and
adding fluid, if needed. See Automatic
Transmission Fluid on page 6 24.
Transfer case fluid level check and adding fluid,
if needed.
Engine air cleaner filter inspection. See Engine Air
Cleaner/Filter on page 6 22.