1998 GMC Envoy Owner's Manual - Page 343

I Long Tripmighway Maintenance Schedule b I 45,000 Miles (75 000 km) (Continued) - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions,change the fluid andfilter every 50,000 miles (83 000 km). 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 50,000 Miles (83 000 km) 0 If you haven't used your vehicle under severe conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. DATE MILEAGE I I SERVICED BY: I 52,500 Miles (87500 km) 0 Change engine oiland filter (or every 12 months, whichever occurs first). An Emission Control Service. Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluid level andadd fluid as needed. Check constant velocity joints and axle sealsfor leaking. (See footnote **.) I DATE I I 7-32