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I have thought about this in my Jeep. When it's about 5°F you can barely shift from 1st to 2nd without stopping. I was looking at immersion heaters for this but the ones I found said 10w for every quart of oil. The smallest heaters they made were 120-150w. By their ratings I would need 20-30w.
Phillips & Temro have quite the variety of heaters, but I have no idea how to order from them.
Since the Prius uses antifreeze the circulation heater should work fine.
I have seen oil pan heaters that you put onto the bottom of the pan somehow.
Good luck
Don
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