The following maintenance items are specific to the CNG systems on your vehicle. These items are required in addition to the maintenance items listed in your GM owner's manual. Be sure to record the date, mileage, and who performed the service in the Maintenance Record.

Footnote

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

Scheduled Maintenance -- All CNG Vehicles

The services shown in this schedule up to 120,000 miles (200 000 km) should be performed after 120,000 (200 000 km) at the same intervals.

Every 7,500 Miles (12 500 km)

•	Inspect the CNG fuel lines and fittings for leaks. (See footnote †.)

•	Inspect the CNG fill valve O-ring. (See footnote †.)

•	Inspect the CNG fill valve filter.

Every 15,000 Miles (25 000 km)

•	Drain the fluids from the in-line CNG filter housing.

•	Replace the CNG in-line filter. An Emission Control Service. (See footnote †.)

Every 60,000 Miles (100 000 km)

•	Remove and clean the CNG fill valve filter.

•	Replace the spark plugs and inspect the spark plug wires. An Emission Control Service. (See footnote †.)

Every 120,000 Miles (200 000 km)

•	Replace the pressure regulator filter. An Emission Control Service. (See footnote †.)