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I've seen the oil drain plug type heater... not on a car though. Some airplanes have them and generally speaking they are too small to heat up the oil very much. Heating pads JB welded to the pan are much better. They heat up the whole engine to 100F+ in a few hours. But that is in an inclosed hangar with an engine cowling that does not let much air out. I think a coolant heater would be a better choice. A coolant heater will warm the inside of the car too.
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