1997 Buick Century Owner's Manual - Page 336

Maintenance Schedule 1 Long Tripmighway Definition Follow this maintenance schedule only if none of the conditions from the Short TripKity Maintenance Schedule is true. Do not use this schedule if the vehicle is used for trailer towing, driven in a dusty area or used off paved roads. Use the Short TripKityschedule for these conditions. Driving a vehicle with a fully warmed engine under highway conditions causes engine oil to break down slowel: ILong Tripmighway Intervals Every 7,500 Miles (12500 km): Engine Oil and Filter Change (or every 12 months, whichever occurs first). Tire Rotation. Every 15,000 Miles (25 000 km): Passenger Compartment Air Filter Replacement. Every 30,000 Miles (50 000 km): Air Cleaner Filter Replacement. Fuel Tank, Cap and Lines Inspection. Every 50,000 Miles (83 000 km): Automatic Transaxle Service (severeconditions only). Every 60,000 Miles (100000 km): Engine Accessory Drive Belt Inspection. Every 100,000 Miles(166 000 km): Spark Plug Wire Inspection. Spark Plug Replacement. Every 150,000 Miles (240 000 km): Cooling System Service (orevery 60 months, whichever occurs first). These intervals only summarize maintenance services. Be sure to,follow the complete maintenance schedule on the.following pages. 7-6