Chevrolet 2002 Impala Owner's Manual page 369

Scheduled Maintenance
22,500 Miles (37 500 km)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for
proper rotation pattern and additional information. (See footnote @.)
(See footnote +.)
30,000 Miles (50 000 km)
j
If Equipped: Replace passenger compartment air filter. If you drive regularly
under dusty conditions, the filter may require replacement more often.
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for
proper rotation pattern and additional information. (See footnote @.)
(See footnote +.)
j
Replace engine air cleaner filter.
An Emission Control Service.
37,500 Miles (62 500 km)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for
proper rotation pattern and additional information. (See footnote @.)
(See footnote +.)
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