Buick 2003 Century Owner's Manual page 322

100,000 Miles (166 000 km)
0 Inspect spark plug wires. An Emission Control
C l Replace spark plugs. An Emission Control Service.
0
Change automatic transaxle fluid and filter if the
vehicle is mainly driven under one or more of
these conditions:
- In heavy city traffic where the outside
Service.
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.
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 5-22 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.
U Inspect engine accessory drive belt. An Emission
Control Service.
U
If you haven't used your vehicle under severe service
conditions listed previously and, therefore, haven't
changed your automatic transaxle fluid, change both
the fluid and filter.
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