Service Intervals
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1987 Pontiac Grand Prix, 1987 Pontiac Firebird, 1987 Pontiac 1000, 1987 Oldsmobile Cutlass, and 1987 Oldsmobile Custom Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Check fluid level at every oil change. Transmission fluid should be changed and filter replaced every 100,000 miles under normal operating conditions.
Under continuous extreme operating conditions (trailer towing, heavy city traffic with ambient temperature over 90°F (32°C) or delivery service), fluid and filter should be changed every 15,000 miles.