Your going to find probably only one thing wrong with it, the oil cooler. On a Ford it is a costly and extensive fix but on a motor that's out in the open to work on it's about 4 hours of your time, 400 bucks in gaskets and a cooler. At a shop it's about a 1200 dollar job. The good thing is, most of the time the engine is fine but the cooling system is completely contaminated with oil. It will take gallons of purple power, a hose and a full day of patience to flush the system out enough to make it reliable for you.
Seriously though, it's an easy fix.
I forgot to add how to confirm my suspicion.
You need to pull the oil pan drain plug first, if coolant or mud comes out before oil for more than a second or so, stop there, the engine is scrap. Next, open up the drain cock for the radiator, if it's muddy or the color of butterscotch and the consistency of a milkshake, there you go, oil cooler is the problem.
The engine itself in a detuned version (that is the VT365) is pretty much forever lasting, the head gasket and egr problems present in the fords never really are problems for internationals, although anything is possible.
IF the engine is scrap, you might as well do a 12 valve cummins repower if you plan to keep it.
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