One thing to add about the VC, is that BMW in their wisdom epoxied the PCV/CCV valve itself to the valve cover - so it's not a serviceable item. When you go to change to the 3IM I'd bet that you'll find some oil in the IM... I did.
There's an option for an aftermarket PCV but it requires essentially chipping the old one out and hoping you don't crack the valve cover.
VC replacement is on my list to do too
