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When you say "oil" do you mean engine oil or were you expanding on your question of "transmission oil".
More than likely, the former. I'm not sure about the PSD. I do not think it has a seperate oil cooler but rather the oil flows through parts of the radiator. I could be wrong about this...
As far as i know - all PSD's have a remote oil and trans. cooler. I think the oil cooler is right behind the license plate - in that general area.......but i could be wrong , it happens every so often