1997 Buick Regal Owner's Manual - Page 365

I Short TripKity Maintenance Schedule I 87,000 Miles (145 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. (See footnote *.) 84,000 Miles (140 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. (See footnote *.) 0Replace passenger compartment air filter. Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE M ACTUAL MILEAGE SERVICED BY. I 1