GMC 2003 Sierra - Manual (Page 509)

100,000 Miles (166 OOQ km)
J Inspect spark plug wires. Afj Emission Control
ServiçB.
-i Replace spark plugs. An Em^ssiof} Conifoi Sen/ice.
□ Ctiange autorrialic Iransml&slon fluid and filter if
the vehicle's GVWft is over 8600 lbs, If the
vehicle has an Allison Transmisslcin or it the vehicle is
mainly driven under one or mane df these corKlilions;
- In haavy cily traffic where the outsicfe
lemperalure regulaHy rsaches 90“ F (32 "C} or
higher,
- In hilly or mcjuntaanous rerrgin.
- Whan doing frequent traUer towing,
- Uses such as found in taxi, police or delivery
service,
■J If you haven't used your vehicle under severe service
conditions listad previously andf therefore, haven't
changed your aulomatic transmission fluid, change
both the fluid and filter
J Automatic Transfer Case Only: Change transfer case
fluid
3 EKoept 0.1L V3 Engine; Inspect Positive Crankcase
Ventilation (PCV) valve, ^n Emission Controi
150.000 Miles (240> 000 km)
■J Drain, flush and telill cooling system (or every
60 months since last service, whichever occurs first).
See Engine. Caoisnl on page 5^33 for what to use.
Inspect hoses. Clean radialof, condenser, pressure
cap and neck.. Pressure test tho cooling system
and pressure cap. An Emission ConJrd Service,
U Change five-speed manual transinission fluid (with
4300 V6
or
4300 VB engines only}
_i Inspect engine accessory dnve belt. An Втт/ssion
CooiTof Service.
200.000 Miles (332 000 km)
J 60Q0 V3 Engine Only: Change ffvB’speed manual
transmission fluid.
6-10