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Cold Weather flying
I noticed on those cold days when I can not get up to 180 degree on oil temp, the next flight I will see a lot of water on the inside of oil filler cap. So, after putting plane in hanger, I remove both filler caps and let some of that moisture out as engine cools down.
Going back to hanger the next day and put caps back on, when cold , eliminates the rust forming on filler cap and maybe gets some of the moisture out of engine. I have the M-20 oil-air seperators on both engines so I do not get oil all over aircraft in flight. I also have the M-20 and plumbing covered in foam insulation to keep them warm to keep moisture problem to a minimium. Every little bit helps. Dale
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