GMC 2010 Sierra Owner's Manual page 608

First Engine Oil Change After Every
160 000 km/100,000 Miles
Automatic transmission fluid change (normal
service). See Automatic Transmission Fluid
(4-Speed Transmission) on page 6 24 or
Automatic Transmission Fluid (6-Speed
Transmission) on page 6 28.
Four wheel drive only: Transfer case fluid change
(normal service). 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.
Spark plug replacement and spark plug wires
inspection. An Emission Control Service.
7-8
First Engine Oil Change After Every
240 000 km/150,000 Miles
Engine cooling system drain, flush, and refill,
cooling system and cap pressure check, and
cleaning of outside of radiator and air conditioning
condenser (or every 5 years, whichever occurs
first). See Engine Coolant on page 6 33. An
Emission Control Service.
Engine accessory drive belt inspection for fraying,
excessive cracks, or obvious damage and
replacement, if needed. An Emission Control
Service.