Very interesting Tony,
There is also an interesting thread on PH in relation to the latest DI 997 engines. Ian_UK1 is looking to get his internals boroscoped soon at an indie garage.
What do you think the bigger issue is - oil seeping past the valve stems, or oil from recirc'd air? Catch cans obviously only help with the latter.
http://www.pistonheads.com/gassing/t...997?&mid=78451