Oldsmobile 1998 Aurora Owner's Manual page 339

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Maintenance Schedule
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100,000 Miles (166 000 km)
0
Inspect spark plug wires.
Replace spark plugs.
0
Change automatic transaxle fluid and bottom screens if the vehicle is mainly
An Emission Control Service.
An Emission Control Service.
driven under one or more of these conditions:
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DATE
1
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MILEAGE
ACTUAL
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SERVICEDBY
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-
In heavy city traffic where the outside temperature regularly reaches
90°F (32°C) or higher.
-
In hilly or mountainous terrain.
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When doing frequent trailer towing.
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Uses such as found in taxi, police or delivery service.
I f
you do not use your veh.icle under any of these conditions, th.e jluid and
filter do not require changing.
150,000 Miles (240 000 km)
17
Drain, flush and refill cooling system (or every 60 months since last service,
MILEAGE
whichever occurs first). See "Engine Coolant" in the Index 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.
7-13