I did this mod and it works great, zero oil consumption, so no complaints.

Question re decommissioned system...

1. I leave the Oil Trap alone b/c it is not sucking any oil or any air (I blocked the end of the hose where it joins the valve cover).
So is it OK to leave the Oil Trap in there "forever"?

2. The Return Hose ---> Dipstick Housing, this hose can break with time but since the Oil Trap is decommissioned, is there any harm of ignoring this hose? Let's say it is broken but you ignore it, any issues?

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT