Apologies if there was a reply expected, as up till a couple of days ago I did not get notifications of any responses to threads I had contributed to... I do get them now though they seem random. As I have typed I have zero M3W experience and no specialist knowledge. I am guessing the oil in sump issue is no big deal initially but over time and build up it could considerably increase carnk-case pressure to the extent is blows a gasket or worse still cause contamination of the CAT as from that which Bitsobrits typed there seems to be no AOS in the system..?

Bunny, not that I doubt your choice of tubing, just that others might think any clear tube might do the trick.... Given the proximity to engine heat, and subject to cracking in time.. I suspect you chose tubing well up to the task as well as resistant to impact from road debris..

Just thinking in type.