1998 Pontiac Firebird Owner's Manual - Page 354

82,500 Miles (137 500 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. footnote +.) (See DATE I 90,000 Miles (150 000 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). DATE I An Emission ControlService. 0 Change automatic transmission fluid and filter if the vehicle is mainly driven under oneor more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90 O F (32O C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as foundin taxi, police or delivery service. Ifyou donot use your vehicle under anyof these conditions, change theJluid and filter every50,000 miles (83 000 km). 0 Replace air cleaner filter. An Emission Control Service. (Continued) 7-29