GMC 1998 Envoy Owner's Manual page 347

I
Long Trip/Highway Maintenance Schedule
I
82,500 Miles (137 500 km)
0
Change engine oil 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 fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote
**.)
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote
+.)
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 (or every 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 for leaking. (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
- In hilly or mountainous terrain.
(32" C) or higher.
DATE
I
MILEAGE
I
DATE
I
+
MILEAGE
ACTUAL SERVICED B Y
7-36