DPF fail and turbo oil leak? New turbo? :(

[Mark-95y02]

Last time I changed my oil on my 2009 Mazda 6 2.2 Diesel I noted a small oil leak, I didn't have time to trace it down so rather foolishly ignored it. On the way to Cornwall, my DPF light started flashing and limp mode came on. Reading the codes it was DPF soot and ash accumulation. I have since had the car towed home and the DPF is off and has been sent for ultrasonic cleaning.

I was concerned that the DPF had been contaminated with oil due to my oil leak, so I searched for my leak whilst the car was up in the air after taking the DPF off and found the source to be this big pipe on the bottom of the turbo. Being so big, I assume its an air pipe? What do we thinks happened here? Turbo blown needing to be rebuilt? Back pressure from the DPF causing the oil leak? Any advice how I should proceed?

Leaking pipe on the bottom of the Turbo (I'm guessing)


The blue rag is above where the leaking pipe is:


To give some context:

[Mark-95y02]

Okay, so the DPF Clean Team told me my DPF was, in fact, knackered. They suggest oil had contaminated it and melted its insides. They have replaced said insides and are sending it back. So, either:

[list]
[li]The DPF got blocked and the back pressure caused an oil backup on the Turbo leading to the oil leak that then killed the DPF[/li]
[li]The turbo seals have failed or oil drain is blocked leading to oil actively killing the DPF[/li]
[/list]

So, a turbo works like this:


So the oil leak is showing up on the intake on the compressor side:


And oil is ending up in the DPF after the turbine side...


So do we think turbo seals? Or, do we think oil drain? Or do we think back pressure? My local turbo specialist said clean up all the oil from the pipes, replace the DPF all fixed, and check in a week to see if oil has returned...? Do the great and beardy mechanics of this forum agree?

Edited by Mark-95y02 on Thursday 8th September 18:00

[Belle427]

I'm no expert on turbos but the drain must be worth checking first if that amount of oil is present in the pipe work.
Do you notice any oil loss at all?

[George111]

Does the shaft on the turbo move about very much ? If there's movement you might want to consider getting it refurbished.