Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Using the Maintenance Schedule
USING THE MAINTENANCE SCHEDULE
Because of all the different ways that customers use their vehicles, maintenance needs vary. Some vehicles may need more frequent inspections and replacements.
This schedule is for vehicles that adhere to certain driving conditions:
^ Vehicles that carry passengers and cargo within recommended limits.
^ Vehicles that are driven on reasonable road surfaces within legal driving limits
^ Vehicles that use the recommended fuel
^ Perform the services in Scheduled Maintenance when indicated. Refer to Additional Required Services for further information.
Refer to Owner Checks and Services for information on the following conditions:
^ What parts should be inspected
^ When to perform the inspection
^ What can be done to help keep the vehicle in good condition
EXTENDED MILEAGE MAINTENANCE
The services shown in this schedule up to 100,000 miles (166,000 km) should be repeated after 100,000 miles (166,000 km) at the same intervals for the life of this vehicle. The services at 150,000 miles (240,000 km) should be repeated at the same interval after 150,000 miles (240,000 km) for the life of this vehicle.
Because of all the different ways that customers use their vehicles, maintenance needs vary. Some vehicles may need more frequent inspections and replacements.
This schedule is for vehicles that adhere to certain driving conditions:
^ Vehicles that carry passengers and cargo within recommended limits.
^ Vehicles that are driven on reasonable road surfaces within legal driving limits
^ Vehicles that use the recommended fuel
^ Perform the services in Scheduled Maintenance when indicated. Refer to Additional Required Services for further information.
Refer to Owner Checks and Services for information on the following conditions:
^ What parts should be inspected
^ When to perform the inspection
^ What can be done to help keep the vehicle in good condition
EXTENDED MILEAGE MAINTENANCE
The services shown in this schedule up to 100,000 miles (166,000 km) should be repeated after 100,000 miles (166,000 km) at the same intervals for the life of this vehicle. The services at 150,000 miles (240,000 km) should be repeated at the same interval after 150,000 miles (240,000 km) for the life of this vehicle.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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