1997 Buick Century Owner's Manual - Page 340

I Short Trip/City Maintenance Schedule I 21,000 Miles (35 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 18,000 Miles (30 000 km) 0Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Rotate tires. See "Tire Inspection and Rotation" inthe Index for proper rotation pattern and additional information. (See footnote +.) DATE SERVICED ACTUAL MILEAGE BY: I DATE I ACTUAL MILEAGE 7-10 1 SERVICED BY: I