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I have had a couple of cars with pad heaters on the engine sump and I have not been impressed by the results. They seem designed merely to warm the oil in the sump, presumably in the belief that it will flow better through a massive lump of cold iron than cold oil would. They make no pretense of heating the block itself and warm-up times for the engine are not noticeably improved. A decent heater in the coolant is a lot better.
I haven't tried a pad heater on the gearbox or diff.
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