GMC 2010 Sierra Owner's Manual page 606

Once a Month
Tire inflation check. See Inflation - Tire Pressure
on page 6 80.
Tire wear inspection. See Tire Inspection and
Rotation on page 6 88.
Once a Year
Starter switch check. See Owner Checks and
Services on page 7 11.
Parking brake and automatic transmission P (Park)
mechanism check. See Owner Checks and
Services on page 7 11.
Automatic transmission shiftlock control system
check. See Owner Checks and Services on
page 7 11.
Ignition transmission lock check. See Owner
Checks and Services on page 7 11.
Engine cooling system and pressure cap pressure
check. Radiator and air conditioning condenser
outside cleaning. See Cooling System on
page 6 32.
Exhaust system and nearby heat shields
inspection for loose or damaged components.
Accelerator pedal check for damage, high effort,
or binding. Replace if needed.
7-6
First Engine Oil Change After Every
40 000 km/25,000 Miles
Fuel system inspection for damage or leaks.
Four wheel drive only: Transfer case fluid change
(extreme duty service) for vehicles mainly driven
off road in four wheel drive. Vehicles used for
farming, mining, forestry, Department of Natural
Resources (DNR), and snow plowing occupations
meet this definition. Check vent hose at transfer
case for kinks and proper installation. Check to be
sure vent hose is unobstructed, clear, and free of
debris. During any maintenance, if a power washer
is used to clean mud and dirt from the underbody,
care should be taken to not directly spray the
transfer case output seals. High pressure water
can overcome the seals and contaminate the
transfer case fluid. Contaminated fluid will
decrease the life of the transfer case and should
be replaced.