Hummer H2 2010 Owner's Manual page 508

Transfer case fluid change (severe service) for
vehicles mainly driven when frequently towing a
trailer, or used for taxi, police, or delivery 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.
First Engine Oil Change After Every
160 000 km/100,000 Miles
Engine air cleaner filter replacement. See Engine
Air Cleaner/Filter on page 6 22.
Automatic transmission fluid change (normal
service). See Automatic Transmission Fluid on
page 6 25.
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
7-6
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.
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 30. An
Emission Control Service.
Engine accessory drive belt inspection for fraying,
excessive cracks, or obvious damage and
replacement, if needed. An Emission Control
Service.