1998 Buick LeSabre Owner's Manual - Page 318

Maintenance Schedule Long Tripmighway Definition I Follow this maintenance schedule only if none of the conditions fromthe Short Trip/City Maintenance Schedule is true. Do not use this schedule if the vehicle is used for trailer towing, driven in dusty area orused a off paved roads. Use the Short TripKity schedule for these conditions. ~~ . I Tripmighway Long Intervals Every 7,500 Miles (12 500 km): Engine Oil and Filter Change (or every 12 months, whichever occurs first). Chassis Lubrication (or every 12 months, whichever occurs first).Tire Rotation. 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 (severe conditions only). Every 60,000 Miles (100 000 km): Engine Accessory Drive BeltInspection. Every 100,000 Miles (166000 km): Spark PlugWire Inspection. Spark PlugReplacement. 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 followthe complete maintenance schedule on the following pages. I Driving a vehicle with a fully warmed engine under highway conditions causes engine oil to break down slower: 7-6