1998 Buick Century Owner's Manual - Page 341

Part E: Maintenance Record After the scheduled services are performed, record the date, odometer reading and who performed the service in the boxes provided after themaintenance interval. Any additional information from "Owner Checks and Services" or"Periodic Maintenance" can be added on the followingrecord pages. Also,you should retain all maintenance receipts. Your owner information portfolio is a convenient place to store them. 7-19