The services shown in this schedule up to 100,000 miles (160 000 km) should be repeated after 100,000 miles (160 000 km) at the same intervals for the life of this vehicle. The services shown 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.

See Part B: Owner Checks and Services and Part C: Periodic Maintenance Inspections .

† The U.S. Environmental Protection Agency or the California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emissions warranty or limit recall liability prior to the completion of the vehicle 's useful life. We, however, urge that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded.

+ A good time to check your brakes is during tire rotation. See Brake System Inspection .

Change engine oil and filter as indicated by the GM Oil Life System (or every 10,000 miles, 16 000 km, or 12 months, whichever occurs first). Reset the system.

Your vehicle has an Engine Oil Life System. This system will show you when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and on a maximum mileage of 10,000 miles (16 000 km). Under severe conditions, the indicator may come on before 10,000 miles (16 000 km). Never drive your vehicle more than 10,000 miles (16 000 km) or 12 months without an oil and filter change. For the oil life system to work properly, you must reset the system every time the oil is changed.

When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message will come on. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset. Your dealer has GM-trained service people who will perform this work using genuine GM parts and reset the system.

It is also important to check your oil regularly and keep it at the proper level.

If the system is ever reset accidentally, you must change your oil at 10,000 miles (16 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed. See "GM Oil Life System" under Engine Oil for information on resetting the system.

An Emission Control Service.

Lubricate chassis components with each engine oil and filter change. Vehicles used under severe commercial operating conditions require lubrication on a regular basis every 3,000 miles (5 000 km).

Lubricate the front suspension, ball joints, steering linkage, transmission shift linkage and parking brake cable guides. Ball joints should not be lubricated unless their temperature is 10°F (-12°C) or higher or they could be damaged.

See the mileage intervals following for additional services that may be performed with an engine oil change and chassis lubrication. After the services are performed, record the date, odometer reading and who performed the service on the maintenance record pages in Part E of this schedule.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Allison Transmission Only: Replace the external control-main filter.

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote †.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Allison Transmission Only: Change automatic transmission fluid and filters 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 every 50,000 miles (83 000 km).

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote †.)

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote  †.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Change automatic transmission fluid and filter. Manual transmission fluid does not require change.

•	Automatic Transfer Case Only: Change transfer case fluid.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote †.)

•	Inspect engine accessory drive belt. An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote †.)

•	Allison Transmission Only: Change automatic transmission fluid and filters 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).

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect engine air cleaner filter change indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect filter change indicator at every engine oil change. See Engine Air Cleaner/Filter for more information. An Emission Control Service. (See footnote †.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•

Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated and the cover fits tightly. Tighten connections and fasteners or replace damaged parts as necessary.This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	If your engine has a thermostatically controlled cooling fan, inspect hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States.

•	Replace fuel filter. See Diesel Engine Fuel . An Emission Control Service. (See footnote †.)

•	Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. See Part D: Recommended Fluids and Lubricants for the proper fluid to use.

•	Rotate tires. See "Tire Inspection and Rotation" in your owner's manual for proper rotation pattern and additional information. See "Tires" in your owner's manual. (See footnote +.)

•	Check Oil Life System. When engine oil and filter are changed, reset the system. See Engine Oil . An Emission Control Service.

•	Change automatic transmission fluid and filter. Manual transmission fluid does not require change.

•	Automatic Transfer Case Only: Change transfer case fluid.

•	Drain, flush and refill the cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant for what to use. An Emission Control Service.