I had a 200W pad heater under the oil pan once. I couldn't tell if it made any difference. I think once the oil got pumped up into the cold engine it was cold again. The nice thing about my 1,600W water heater is that it circulates that water through the engine as it heats it. I wonder if you could circulate the transmission fluid through a heater. Or maybe just cover the entire transmission in 200W pad heaters.
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