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Buick 1998 Riviera Owner's Manual page 330

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Short TripKity Maintenance Schedule
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- 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.
If you do not use your vehicle under any of these conditions, the fluid and
filter do not require changing.
150,000 Miles (240 000 km)
0
DATE
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Drain, flush and refill cooling system (or every 60 months since last service,
Inspect hoses. Clean radiator, condenser, pressure cap and neck.
Pressure test cooling system and pressure cap.
An Emission Control Service.
whichever occurs first). See "Engine Coolant" in the Index for what to use.
MILEAGE

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