Rear turbo leaking oil, air, or BOTH???

[Citationdoc]

Howdy folks!

2013 nonPP with LMS Stage 1 tune, 3bar MAP, CAI. Just rolled 104k miles. This car is my DD and I drive it in a "spirited" manner. I do NOT beat it by any means, but I DO put my foot in it most of the time (don't most of us lol?). Just in last couple of days I've noticed when I get on the accelerator, there is a NOTICEABLE sound when it shifts. It almost sounds like blowoff, and sounds like it's coming from left side. If I really get on the gas, it almost sounds like a "chirp" or high pitched, quick whistle or squeal; but it's very short duration. Happens at every upshift. Don't hear the sound if I'm accelerating gently. Shifts don't feel noticeably different. Got under the hood, and noticed crud (oil/dirt) on the rear turbo pipe that goes from turbo up front to the intercooler (I'm assuming). There appears to be a flexible coupling held on by a hose clamp on the turbo side and somehow clamped tot the rigid air pipe, and that's where the oil crud is. No other evidence of leaking anywhere. I haven't disconnected the tube from the turbo yet. It almost appears that there may be a leak or crack where the flex coupling meets the rigid tube since that's where the oil is concentrated. Is this evidence of the rear turbo taking a **** or just a cracked pipe? Should I quit driving before I eat a turbo? I'm babying it since I discovered this but could really use some help from those of you more familiar! Attached are pic's (as PDF files) of exactly where the oil seems to be leaking from.

Thanks in advance as always!​

 

[SilverSH0]

I would have to go look at my car to be 100% sure but I do know it's common for oil to be in that tube (just not sure in that location). When under boost the pressure from the cranks case will push air/oil mixture out into that tube. Normally the air will move towards the CAC and take the oil with it. As a result, the oil that accumulates is generally located where that pipe connects to the CAC (not near the firewall).

I would say the best way would be to removed the tube from the turbo (if you can) and see what the inside of the turbo looks like.