2002 Buick Century Owner's Manual - Page 327

Scheduled Maintenance 30,000 Miles (50 000 km) j 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. DATE ACTUAL MILEAGE SERVICED BY: 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 +.) DATE ACTUAL MILEAGE SERVICED BY: 45,000 Miles (75 000 km) j Inspect engine air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote [.) j 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 +.) DATE ACTUAL MILEAGE SERVICED BY: 7-10