1993 Pontiac Firebird Owner's Manual - Page 291
1993 Pontiac Firebird Manual
Page 291 highlights
Maintenance Schedule, Section A: Scheduled Maintenance Services (Cont.) ITEM NO. SERVICE 6 TransmissionService - For manualtransmissions, fluid doesn't require changing. For automatic transmissions, change both the fluid and filter every 15,000 miles (25 000 km) if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. ITEM NO. SERVICE When doing frequent trailer towing. Uses such as found in taxi, police car or delivery service. If you do not use your vehicle under any of these conditions, change both the fluid and filter every 100,OOO miles (160 000 km). 7 SparkPlugReplacement* - Replacesparkplugs with the proper type. See "Replacement Parts" in the Index. *An Emission Control Service.