My old Toyota Celica turbo all trac had one from the previous owner (he was a ski-bum). It worked really well, according to him as he parked outside a lot up at the mountain ski resorts.

As Vonbimmer aludes to; it's gotta be better than low temp oil. Heat transfer through the aluminum pan will be good. Just have a heavy duty outlet timer, a good extension cord, and let it rip!

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual