I also had 1-2" of oil in crank case vent tube when bike was first new. I called CSC and they said to just take the black plug in the end out and not worry about it and let it vent away. I took the plug out and drilled a 1/16" hole in it and reinstalled it back in the tube end. My reasoning is if I ever got into a water crossing that could reach the tube the plug could stop most of the water from filling the tube but it can still vent ,drain out all the time so I don't see the 1-2" of oil being built up any more. rj
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