Hummer 2003 H2 Owner's Manual page 417

Scheduled Maintenance
90,000 Miles (150 000 km)
j
Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
j
Replace fuel filter.
An Emission Control Service. (See footnote
j
Replace engine air cleaner filter. An Emission Control Service.
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
97,500 Miles (162 500 km)
j
Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
100,000 Miles (166 000 km)
j
Inspect spark plug wires.
An Emission Control Service.
j
Replace spark plugs.
An Emission Control Service.
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