GMC 2002 Sierra - Manual (Page 473)

Scheduled Maintenance
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., if the vehicle has an Allison transmission 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 Except 8.1L V8 Engine: Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
ACTUAL
SERVICED BY:
MILEAGE
DATE