1997 Buick Century Owner's Manual - Page 343

I Short Trip/City Maintenance Schedule I 39,000 Miles (65 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Replace passenger compartment air filter. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE ACTUAL MILEAGE SERVICED B Y DATE ACTUAL MILEAGE SERVICED BY: I I I I I I 7-13