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Winter problems
I to installed M-20 air/oil seperators on my 337H 6 years ago. This was due to a oil slick found on the belly and tail area. I also insulated the breather line from engine to M-20 including M-20 down the exit pipe on both engines. My rear engine always ran much hotter than the front engine, which is normal for 337. In summer I fly with cowl flap door partially open when tempature above 85 degree. In winter rear runs about 180-200 degree. The front engine runs 180-200 in summer but ran 160-170 in winter. I now install a plate above front engine oil cooler for winter to get the engine above 180 degree. Without the plate I was holding water in oil and could see droplets on dip stick. No problem now with plate installed. My bird is normally asperated so anything above 13,000 feet is out of the question and I live and fly in Pennsylvania and mostly fly 500 mile radius of Pa, so I do not experiance any super cold air.
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