When I bought my car it already had an extremely primitive wvo setup installed consisting of a manual valve and an outboard tank. Worst of all the system the guy was using for heating the oil was.... a tail-light bulb submersed in the oil! As such I am looking for another heating idea and truthfully I would prefer something electric over re-routing engine coolant. I've seen similar elements at farm stores for de-icing water troughs and I wonder if they would work effectively.
Low Voltage Electric Hot Water Heater Elements