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Heating the oil was standard procedure for starting WW1 aircraft engines in cold weather, in particular, the Jenny.
A relative had an auto repair business in a coastal resort town many years ago. Mercedes, especially, would not start in foggy weather. He took an extension cord and a blanket, left the blanket on the engine a while, came back later to start the car.
He claimed he made good money that way.
Ray Mac.
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