Buick 1999 LeSabre Owner's Manual page 316

Short Trip/City Scheduled Maintenance
45,000 Miles (75 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service. (See footnote *.)
j
Inspect air cleaner filter if you are driving in dusty conditions. Replace filter
if necessary.
An Emission Control Service. (See footnote
48,000 Miles (80 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service. (See footnote *.)
j
Lubricate chassis components (or every 6 months, whichever occurs first).
(See footnote #.)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
(Also see footnote ++.)
50,000 Miles (83 000 km)
j
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
_
(32 C) or higher.
– In hilly or mountainous terrain.
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