1997 GMC Suburban Owner's Manual - Page 362

Maintenance Schedule I Long Trip/Highway Intervals -- Gasoline Engines Every 30,000 Miles (50 000 km): Fuel Filter Replacement. Front Wheel Bearing Repack (2WD only) (or at each brake relining, whichever occurs first). Every 50,000 Miles (83 000 km): Automatic Transmission Service (severe conditions only). Every 60,000 Miles (100 000 km): Engine Accessory Drive Belt Inspection. Fuel Tank, Cap and Lines Inspection. Exhaust Gas Recirculation System Inspection. Evaporative Control System Inspection. Every 100,000 Miles (166 000 km): Spark Plug Wire Inspection. Spark Plug Replacement. Positive Crankcase Ventilation (PCV) Valve Inspection. Every 150,000 Miles (240 000 km): Cooling System Service (or every 60 months, whichever occurs first). These intervals onlysummarize maintenance services. Be sure to.follow the complete maintenance schedule on the following pages. Follow this maintenance schedule only if none of the conditions from the Short Trip/City 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 Trip/City schedule for these conditions. Driving a vehicle with a fully warmed engine under highway conditions causes engineoil to break down slower. I Long Trip/Highway Intervals -- Gasoline Engines 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).Drive Axle Service. Tire Rotation. Every 15,000 Miles (25 000 km): Shields and Underhood Insulation Inspection (GVWR above 8,500 lbs. only). 7-6