It's Isuzu part number 5-21770-001-2. It's called the oil cooler thermo-valve and St Charles has it for $49. Mine was shot so I took it out and just stuck in a piece of copper pipe and my truck does run much cooler. So much in fact that it failed emmissions three days ago, so I guess I'm going to have to cover the radiator partially to get it up to temp specs or buy the danged part...

Jesse


1986 Isuzu Trooper II TD 5spd 4x4
98 Mercedes E300 TDi