1998 Pontiac Firebird Owner's Manual - Page 339

I Short TripKity Maintenance Schedule I DATE 50,000 Miles (83 000 km) 0 If you haven't used your vehicle under severe service conditions previously listed and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. Manual transmission doesn't require change. fluid I 51,000 Miles (85 000 km) 0 Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. I DATE I I I 54,000 Miles (90 000 km) 0 Change engine oil and filter (aevery 3 months, whichever occurs first). An Emission Control Service. 0 Rotate tires.See "Tire Inspectionand Rotation" in the Indexfor proper rotation pattern and additional information. (See footnote +.) 0 Change the rear axle gear lubricant if vehicle is used to pull a trailer. DATE 1 57,000 Miles (95 000 km) Change engine oil and filter (or every 3 months, whichever occursfist). An Emission Control Service. I DATE I 7-14