Buick 1999 LeSabre Owner's Manual page 333

Long Trip/Highway Scheduled Maintenance
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
100,000 Miles (166 000 km)
j
Inspect spark plug wires.
An Emission Control Service.
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Replace spark plugs.
An Emission Control Service.
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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 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.
j 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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DATE
ACTUAL
SERVICED BY:
MILEAGE
7-31