Service Intervals
WARNING: This page is about a different car, the 1985 Isuzu Trooper II, 1985 Isuzu Pickup, 1985 Isuzu Impulse, and 1985 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.