Buick 2001 Regal Owner's Manual page 335

Scheduled Maintenance
30,000 Miles (50 000 km)
j
Replace passenger compartment air filter. If you drive regularly under dusty
conditions, the filter may require replacement more often.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation
pattern and additional information. (See footnote @.) (See footnote +.)
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Replace engine air cleaner filter.
An Emission Control Service.
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For supercharged engines only: Check the supercharger oil level and add oil as
needed (or every 36 months, whichever occurs first). See "Recommended
Fluids and Lubricants" in this section.
An Emission Control Service. (See footnote
37,500 Miles (62 500 km)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation
pattern and additional information. (See footnote @.) (See footnote +.)
7-10
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