1997 Buick Century Owner's Manual - Page 365

I Long Tripmighway Maintenance Schedule 97,500 Miles (162 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 100,000 Miles (166 000 km) 0Inspect spark plug wires. An Emission Control Service. 0Replace spark plugs. An Emission Control Service. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) I DATE I ACTUAL MILEAGE ISERVICED BY: I Change automatic transaxle fluid andfilter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches90 O F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. (Continued) 7-35