Buick 1999 Riviera Owner's Manual page 315

Short Trip/City Scheduled Maintenance
45,000 Miles (75 000 km)
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Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
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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)
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Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
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Lubricate chassis components (or every 6 months, whichever occurs first).
(See footnote #.)
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
50,000 Miles (83 000 km)
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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
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(32 C) or higher.
– In hilly or mountainous terrain.
– When doing frequent trailer towing.
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