GMC Sierra Denali Owner's Manual page 384

90,000 Miles (150 000 km)
0
Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
0 Replace fuel filter. An Emission Control Service. (See
Footnote
t.)
0
Replace engine air cleaner filter. An Emission
Control Service.
0 Rotate tires. See Tire Inspection and Rotation on
page 5-62 for proper rotation pattern and additional
information. (See footnote +.)
97,500 Miles (162 500 km)
c [ I
Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
page 5-62 for proper rotation pattern and additional
information. (See footnote +.)
0
Rotate tires. See Tire Inspection and Rotation on
100,000 Miles (166 000 km)
0 Inspect spark plug wires. An Emission Control
0 Replace spark plugs. An Emission Control Service.
Service.
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.
-
When doing frequent trailer towing.
-
Uses such as found in taxi, police or delivery
service.
0 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.
0
Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
0
Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See Engine Coolant on page 5-24 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.
0
Inspect engine accessory drive belt. An Emission
Control Service.
6-9