This is apparently an oil-cooled turbo, so it should feel like brand new. We're talking about turbos that have been engineered to run with coolant lines.
Correct me if Im wrong, but dont ALL turbos have a fitting for oil lines? I havnt seen one w/o one yet. And your right, Mistubishi did spend a lot of time engineering their cooling method for the turbo via water & oil because they were tired of fixing shit when people would abuse their car and not let the oil cycle through the turbo to cool it off. With water cooling implemented it allows the turbo to keep cycling water witht he car TURNED OFF because of the heat generated. The water will continue to flow through the casing until it cools to a point where the water no longer flows. I believe this is called CONVECTION where water can flow in and out of something with no mechanical means like a pump etc.