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If a catch can could be created that drained back to the crankcase that would mean you would not have to service them. I don't know how strong the vacuum is through them, but you could put a drain with a one way valve to avoid it sucking fumes from the crankcase through the drain tube while the car is running. When you shut down for the day, the oil drains back to the pan. Seems like a feasable thing to do.
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