GMC 1998 Envoy Owner's Manual page 340

I
Long TripMighway Maintenance Schedule
I
-
-
When doing frequent trailer towing.
2
Uses such as found in taxi, police or delivery service.
lfyo~t
do
not use your vellicle under any
qf
these conditions, cnnnge the fluid
and filter every 50,000 miles (83 000 km).
rotation pattern and additional information. (See footnote
+.)
0
Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper
22,500 Miles (37 500 km)
0
Change engine oil and filter (or every 12 months, whichever occurs first).
0
Lubricate chassis components (or every 12 months, whichever occurs first).
0
Check readfront axle fluid level and add fluid as needed. Check constant
0
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
An Emission Control Service.
(See footnote #.)
velocity joints
and axle seals
for leaking. (See
footnote
**.)
rotation pattern and additional information. (See footnote
+.)
DATE
30,000 Miles (50 000 km)
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
MILEAGE
(Continued)
7-29