1997 Pontiac Firebird Owner's Manual - Page 354

I Long Trip/Highway MaintenanceSchedule I 22,500 Miles (37 500 km) - Uses such as found in taxi, police or delivery service. 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. If you do not use your vehicle under of any these conditions, change the fluid and filter at 100,000 miles (166 000 km). 0Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) Manual transmission fluid doesn't require change. 17 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) (Also see footnote ++.) 7-33