Buick 1993 Roadmaster Owner's Manual page 309

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7.
8.
To help ensure-proper operation, we recommena a
pressure test of both'the cooling system and the
pressure cap.
If you do not use your vehicle under any
of these
conditions, change both the fluid and
filter every
100,000 miles (1 60 000 km).
Front Wheel Bearing Repack
- When your
9. Spark Plug Replacement* - Replace spark plugs
vehicle is used in such service
as police work, as a with the proper type. See "Specifications Chart.''
in
taxi or in door-to-door delivery, clean and
repackthe
the Index.
front wheel bearings at each brake relining or
15,000
Spark plug Wire Inspection*?
- Inspect for
miles (25 000 km), whichever comes first. If you
don't use your vehicle in such service, clean and
repack the bearings at each brake relining or
30,000
-
miles (50 000 k m ) whichever comes first.
burns, cracks .or other damage. Check the boot fit
at
the distributor and at the spark plugs. Replace wires
as. needed.
Transmission Service
- Change both the fluid and
filter every 15,000 miles (25 000
km)
if the vehicle
is mainly driven under one or 'more
of these
conditions:
In heayy city traffic where the outside
temperature regularly reaches '90
O F
(32
C) or
higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police car or delivery
service.
11. Exhaust Gas Recirculation (EGR) System
Inspection*?
-
Conduct the EGR system service
as described in the service manual. To purchase a
service manual, see "Service Publications" in the
Index.
12. Air Cleaner Filter Replacement*
-
Replace every
30,000 miles (50 000
k m )
or more ofkn under dusty
conditions. Ask your dealer for the proper
replacement intervals for your driving conditions.
307

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