1997 Buick Century Owner's Manual - Page 353

I Short TripKity Maintenance Schedule I 0Rotate tires. See "Tire Inspection and Rotation" in the Index proper rotation for pattern and additional information. (See footnote +.) 90,000 Miles (150 000 km) 0Change engine oil and filter (or every 3 months, whichever occursfirst). An Emission Control Service. 0Replace air cleaner filter. An Emission Control Service. 0Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket for any damage. Replace partsas needed. An Emission Control Service. (See footnote?.) DATE ACTUAL MILEAGE SERVICED BY: 7-23