GMC 2003 Yukon XL, Owner'S Manual

Page: 478 / 518

97,500 Miles (162 500 km)
❑
Check rear/front axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
❑
Rotate tires. See Tire Inspection and Rotation on
page 5-62 for proper rotation pattern and additional
information.
(See fo.)
100,000 Miles (166 000 km)
❑
Inspect spark plug wires. An Emission Control
Service.
❑
Replace spark plugs. An Emission Control Service.
❑
Change automatic transmission fluid and filter if
the vehicle’s GVWR is over 8,600 lbs or 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.
− When doing frequent trailer towing.
− Uses such as found in taxi, police or delivery
service.
❑
If you haven’t used your vehicle under severe service
conditions listed previously and, therefore, haven’t
changed your automatic transmission fluid, change
both the fluid and filter.
❑
Change transfer case fluid.
❑
Except 8.1L V8 Engine: Inspect Positive Crankcase
Ventilation (PCV) valve.
An Emission Control
Service.
150,000 Miles (240 000 km)
❑
Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See
Engine Coolant on page 5-26 for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service.
❑
Inspect engine accessory drive belt. An Emission
Control Service.
6-10