Thanks for the pic Wayne, unfortunately it doesnt mean much to me, I’m a bit thick! Also after googling it more, I don’t think Venturi is even the right word for what might be happening.

And yeah, after doing my intake manifold etc, now have a thin film of oil all over everything again. Will be making a catch can when I get the chance at work, 12hr days in this heat isn’t much fun at the mo! Then need to remove intercooler and give that a clean out too!

__________________
2004 X5 3.0d
2010 X5 40d

New Zealand