1998 GMC Envoy Owner's Manual - Page 347

I LongTrip/HighwayMaintenanceSchedule I 82,500 Miles (137 500 km) Change engineoil and filter (or every 12 months, whichever occurs first). An Emission Control Service. Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) Check readfront axle fluidlevel and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE MILEAGE I 90,000 Miles (150 000 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (orevery 12 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals forleaking. (See footnote**.) 0 Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32"C) or higher. - In hilly or mountainous terrain. + I DATE I ACTUAL MILEAGE SERVICED B Y 7-36