Service Intervals
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1988 Pontiac Sunbird, 1988 Pontiac Grand Prix, 1988 Pontiac Grand Am, 1988 Pontiac Firebird, and 1988 Pontiac Fiero. However, it is still accessible from the selected car via links, so may be relevant.
Check fluid level at 3 month/3000 mile intervals. Draining and refilling is not required, except at time of overhaul or service.
On Corvette, change fluid in overdrive unit every 30,000 miles. On Nova, change fluid in transaxle every 20,000 miles.