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Overhead settings...loose injector adjustment. There is one oil passage in the 855 head...never seen a crack expand to let oil in then close up. Cavitation of the liner CAN put oil in the coolant but will 99% of the time put coolant in the oil first Flush it, give it a good tank of fresh...

If the o/c leaks, the radiator will fill with the oil from the engine and push out the overvlow. If you have run the truck much since the last Dirtbag and haven't lost oil or pushed oil out the cap, i'd say no on the cooler. Drain the coolant and put a couple of cap fulls of liquid laundry soap...