GMC 2001 Sierra - Manual (Page 441)

Scheduled Maintenance -- Gasoline Engines
7-16
100,000 Miles (166 000 km)
j Inspect spark plug wires.
An Emission Control Service.
j Replace spark plugs.
An Emission Control Service.
j Change automatic transmission fluid and filter if the vehicle’s GVWR
is over 8600 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.
j 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.
j Automatic Transfer Case Only: Change transfer case fluid.
j Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
ACTUAL
SERVICED BY:
MILEAGE
DATE