Since fitting the catch can this also could be why it's stopped happening.
The rocker cover engine oil fumes go via the turbo, this is where the soot oily crap comes from.
They do this to help with emissions ect.
Catch can will also help to protect your oxygen mass sensor, but not convinced the way it's plumbed up.

If I'm incorrect someone let me know.

Quote Originally Posted by Club 4x4 View Post
What I noticed as I tightened the clamp down was that it wasn't as rigid where it comes together. It still doesn't make sense that you get soot from there though


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