2003 Hummer H2 Owner's Manual - Page 414

Scheduled Maintenance 45,000 Miles (75 000 km) j Inspect engine air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote [.) 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 +.) DATE ACTUAL MILEAGE SERVICED BY: 50,000 Miles (83 000 km) j Change automatic transmission fluid and if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90_F (32_C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the fluid and filter at 100,000 miles (166 000 km). j Change transfer case fluid. DATE ACTUAL MILEAGE SERVICED BY: 7-11