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Even with the things mentioned above ^ you will still see a small buildup of oil over time. It is just the way of things. Oil in an engine to some small degree gets turned into a vapor/mist of sorts during normal engine operation. There are ways to reduce it reaching places you don't want it to go, but it will still happen.
An alternative to a PCV valve mentioned by ARH would be some sort of oil catch can/breather setup. Either solution will work, but the PCV is a much simpler one to do,
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