2001 Buick Regal Owner's Manual - Page 335

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. j For supercharged engines only: Check the supercharger oil level and add oil as needed (or every 36 months, whichever occurs first). See "Recommended Fluids and Lubricants" in this section. An Emission Control Service. (See footnote [.) 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: 7-10