2001 Buick Regal Owner's Manual - Page 336

Scheduled Maintenance 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: 50,000 Miles (83 000 km) j Change automatic transaxle 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. If you do not use your vehicle under any of these conditions, change the fluid and filter at 100,000 miles (166 000 km). DATE ACTUAL MILEAGE SERVICED BY: 7-11