Rig
Guest
Since it is turbocharged I would think that it has a oil cooler. This would be the most obvious place for oil to transfer to water. Head gasket breach from the head oil supply port would also be a possiblity. I would make sure, though, that this was a ongoing problem and not just a case of a repair job that did not include a good cleaning. All rubber componets in the cooling system will be negatively affected by that oil.