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 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 emission 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.

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

Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. 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 light will come on. Change your oil as soon as possible within the next two times you stop for fuel. 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 3,000 miles (5 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed. See Engine Oil for information on resetting the system.

An Emission Control Service.

See the mileage intervals following for additional services that may be performed with an engine oil change. 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 axle fluid level and add fluid as needed.

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

•	Check rear axle fluid level and add fluid as needed.

•	Check rear axle fluid level and add fluid as needed.

•	Change automatic transmission fluid and filter 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.

•	Check rear axle fluid level and add fluid as needed.

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

•	Replace engine air cleaner filter. See Engine Air Cleaner/Filter for more information. An Emission Control Service.

•	Check rear axle fluid level and add fluid as needed.

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

•	Check rear axle fluid level and add fluid as needed.

•	Check rear axle fluid level and add fluid as needed.

•	Change automatic transmission fluid and filter.

•	Check rear axle fluid level and add fluid as needed.

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

•	Replace engine air cleaner filter. See Engine Air Cleaner/Filter for more information. An Emission Control Service.

•	Check rear axle fluid level and add fluid as needed.

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

•	Check rear axle fluid level and add fluid as needed.

•	Check rear axle fluid level and add fluid as needed.

•	Change automatic transmission fluid and filter 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.

•	Check rear axle fluid level and add fluid as needed.

•	Replace fuel filter. An Emission Control Service. (See Footnote †.)

•	Replace engine air cleaner filter. See Engine Air Cleaner/Filter for more information. An Emission Control Service.

•	Check rear axle fluid level and add fluid as needed.

•	Inspect spark plug wires. An Emission Control Service.

•	Replace spark plugs. An Emission Control Service.

•	Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service.

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