Buick 2002 Regal Owner's Manual page 338

Scheduled Maintenance
52,500 Miles (87 500 km)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation
pattern and additional information. (See footnote @.) (See footnote +.)
60,000 Miles (100 000 km)
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Replace passenger compartment air filter. If you drive regularly under dusty
conditions, the filter may require replacement more often.
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For supercharged engines only: Check the supercharger oil level and add the
proper supercharger oil as needed (or every 36 months, whichever occurs
first). See "Recommended Fluids and Lubricants" in this section.
An Emission Control Service. (See footnote
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation
pattern and additional information. (See footnote @.) (See footnote +.)
j
Inspect engine accessory drive belt.
An Emission Control Service.
j
Replace engine air cleaner filter.
An Emission Control Service.
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