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Generally there's always a thin layer of oil between metal surfaces i.e. crank journals and bearings. Obviously when running, but it stays behind afterwards. I wouldn't find it hard to believe that eventually however, gravity brings the metal parts together and gets 100% of the oil out of the way, at least in spots. My theory anyhow. Not sure if it's a week, a month, a year, but at some point (?).
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