1997 Buick Century Owner's Manual - Page 350

I Short Trip/City Maintenance Schedule I 75,000 Miles (125 000 km) 0Change engine oiland filter (or every 3 months, whichever occurs first). An Emission Control Service. 72,000 Miles (120 000 km) 0Change engine oil andfilter (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 +.) 0Inspect air cleaner filter if you are driving in dusty conditions. Replacefilter if necessary. An Emission Control Service. (See footnote?.) DATE ACTUAL MILEAGE SERVICED BY DATE SERVICED ACTUAL MILEAGE BY. 7-20