1997 Buick Century Owner's Manual - Page 361

Long Tripmighway Maintenance Schedule I 50,000 Miles (83 000 km) I I 52,500 Miles (87 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90O F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. 0Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper rotation pattern and additional information. (See footnote +.) If you do not DATE ACTUAL useyour vehicle under anyf these o conditions, the fluid and do not require changing. filter MILEAGE SERVICED BY: DATE ACTUAL MILEAGE SERVICED BY: 7-31