Kats 1160 300 Watt Magnum Magnetic Heater

Does not work as advertised. Get a "Frost/Freeze Plug insert type. That works. Barely heats oil pan. When 30*F temp, cannot tell the thing is on. It gets hot but very poor conduction to target.

Kats 300 watt magnetic block heater works like a charm. I stuck it to the bottom of the oil pan, plugged it in and left it overnight. Came back the next day, and the oil in the engine was warm. Works well.