1998 GMC Envoy Owner's Manual - Page 317

Maintenance Schedule Trip/City IIntervals Short Every 150,000 Miles (240 000 km): Cooling System Service (or every 60 months, whichever occurs first). These intervals only summarize maintenance services. Be sure to follow the complete maintenance schedule on the following pages. I Long TridHiehwav 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).Drive Axle Service. Tire Rotation. Every 15,000 Miles (25 km): Automatic 000 Transmission Service (severe conditions only). Every 30,000 Miles (50 000 k ) Fuel Filter m: Replacement. Air Cleaner Filter Replacement. Every 50,000 Miles (83 000 km): Automatic Transmission Service (normal conditions). Every 60,000 Miles (100 km): Engine 000 Accessory Drive Belt Inspection. Fuel Tank, Cap and Lines Inspection. Every 100,000 Miles (166 km): Spark PlugWire 000 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 only summarize maintenance services. Be sure to follow complete maintenance schedule on the the following pages. 1 Long TridHiEhwav Definition 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 TripKity schedule for these conditions. Driving a vehicle with a fully warmed engine under to highway conditions causes engine oil break down slower: 7-6