Pontiac 1999 Firebird Owner's Manual page 329

Scheduled Maintenance
– When doing frequent trailer towing.
– Uses such as found in taxi, police or delivery service.
If you do not use your vehicle under any of these conditions, change the
fluid and filter every 50,000 miles (83 000 km).
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
22,500 Miles (37 500 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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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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DATE
ACTUAL
SERVICED BY:
MILEAGE
7-7