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Advisory Circular AC 91-13C covers cold weather operation of aircraft.
Section 4, d. says the Oil Breather requires special consideration. Frozen breather lines can create numerous problems.
My Skymaster had baffles that attached inside the front engine cowling, to reduce the amount of air flowing over the engine, during cold weather operations. Unfortunately, I don't have access to the POH anymore, but I seem to think these were for operations below 20 degrees F.
The whole AC is interesting reading for those who operate in cold weather.
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