Service Intervals
WARNING: This page is about a different car, the 1986 Isuzu Trooper II, 1986 Isuzu Pickup, 1986 Isuzu Impulse, and 1986 Isuzu I-Mark. However, it is still accessible from the selected car via links, so may be relevant.
Check fluid every 7500 miles or 12 months. Replace fluid after first 7500 miles and every 30,000 miles thereafter.