All that I've been able to find on the "improved" engine is that the baffle inside the head was changed slightly and the PCV valve was switched to a screw-in type as most of the issue revolved around the sealing of the valve.
As far as changing the PCV, you should check and change it regularly on any engine equipped with one. That's just a common maintenance item, and one that's all too often overlooked.
I've been working a lot lately on my Mercedes biodiesel project car and you should see how the crankcase is ventilated in that thing. Simple baffle in the valve cover, internally baffled rubber breather hose from the valve cover fitting to the air cleaner, which has an internal cyclonic separator pot that drains separated oil back into the oil pan and a venturi tube to feed vapor into the turbo. Just got it all back together last night after completely disassembling, cleaning and servicing it. There's an o-ring on a check-valve that the oil return tube fits over on the top of the oil pan that was a minor pain to deal with, but hopefully it'll be nice and tight and not need any more attention for some time. PCV valves are much, MUCH simpler!
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