Buick 1999 Regal Owner's Manual page 321

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 +.)
30,000 Miles (50 000 km)
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Check Oil Life Monitor. If engine oil and filter are changed, reset monitor.
See "Engine Oil" in the Index.
An Emission Control Service. (See footnote *.)
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Replace passenger compartment air filter.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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Replace air cleaner filter.
An Emission Control Service.
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Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket
for any damage. Replace parts as needed.
An Emission Control Service. (See footnote
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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
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DATE
ACTUAL
SERVICED BY:
MILEAGE
7-7