1997 Buick Regal Owner's Manual - Page 371

7,500 Miles (12 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote * .) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 15,000 Miles (25 000 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote * .) Replace passenger compartment air filter. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) I DATE ACTUAL MILEAGE SERVICED BY: DATE ACTUAL MILEAGE SERVICED BY: