1998 Pontiac Firebird Owner's Manual - Page 348

I Long Tripmighway Maintenance Schedule 7,500 Miles (12 500 km) 17 Change engine oil and filter (or An Emission Control Service. DATE I every 12 months, whichever occurs first). MILEAGE 0 Change the rear axle lubricant if the vehicle has limited-slip differential. gear 0 Rotate tires. See "Tire Inspection and Rotation" in the Index proper for rotation pattern and additional information. footnote +.) (See 15,000 Miles (25 000 km) filter (or every12 months, whicheveroccurs first). 0 Change engine oil and An Emission Control Sewice. is mainly 0 Change automatic transmission fluid and filter if the vehicle driven under oneor more of these conditions: - In heavy city traffic wherethe outside temperature regularly reaches 90°F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as foundin taxi, police or delivery service. If you do not useyour vehicle under any of these conditions,change the fluid andfilter every 50,000 miles (83 000 km). for proper 0 Rotate tires. See "Tire Inspection and Rotation" in the Index rotation pattern and additional information. footnote +.) (See MILEAGE 7-23