1997 Buick Regal Owner's Manual - Page 352

I Short TripKity Maintenance Schedule I 15,000 Miles (25 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. (See footnote *.) 0Inspect air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote?.) 18,000 Miles (30 000 km) c7 Change engine oil and filter (or everj 3 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 +.) I I I 1 DATE ACTUAL MILEAGE SERVICED B Y DATE ACTUAL MILEAGE SERVICED BY: 7-10