As far as the freezing/moisture problem I think of it this way, The crankcase is closed so it is filled with moisture saturated combustion gases. The moisture ends up forming dropplets, which get seperated in the cyclone oil seperator, which ironically works much better seperating heavey moisture droplets than it does oil, and returned to the crankcase. The CCCV can only get rid of moisture vapour not droplets, so the only way to reduce the moisture is to let in a little unsaturated atmosphere to absorb it and let it get sucked through the seperater and into the intake as vapour.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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