GMC Sierra 2000, Owner'S Manual

Page: 399 / 426

Long Trip/Highway Scheduled Maintenance
7-50
100,000 Miles (166 000 km)
j Gasoline Engine Only: Inspect spark plug wires.
An Emission Control Service.
j Gasoline Engine Only: Replace spark plugs.
An Emission Control Service.
j Change automatic transmission fluid and filter if the vehicle has a diesel
engine, 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.
Manual transmission fluid doesn’t require change.
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. Manual transmission fluid doesn’t
require change.
j Gasoline Engine Only: Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
ACTUAL
SERVICED BY:
MILEAGE
DATE