Join Date: Nov 2000
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If you run oil through the cooler, you'll have more oil to empty and possibly more dirty oil left in the system each oil change. Water is heavier than oil, and I suspect has more heat content, might be more efficient transfer of heat into the radiator assembly. If you go to the junkyard, you may be able to find an auxillary heater from a schoolbus. They have a box with a small rad and a fan designed for heating interiors. Cheap source, assuming its in working shape.