Oil Consumption... Turbo?

C

colin.rac

Greenie N00B Member
Hello all,
I recently bought a 2010 MS3, and it has been an absolute blast.

In the 3 months of ownership, I have replaced the VVT, but a problem that has been apparent since I have had it has been this horrible oil consumption, burnt through the dipstick in 3 days with hard driving.

I have done a bit of diag on this. I have reason to think rings/valve seals are not my problem here. I have not done a leak down, but comp is 180 across the board. I pulled the plugs and all plugs look in okay condition (in relation to oil burning, slightly white on the tip, due to normal wear and tear, probably should replace them), but no oil fouling or anything such as that.

I have taken the turbo outlet pipe (one that feeds into the intercooler), and found that there is a thin film of oil there. Similarly, I have taken off the breather hose from the VC to intake just before the maf. There is a very light film of oil, but being a breather, I'm not concerned about that. Main reason for doing that is too check if its breathing heavy, which it is not (thankfully).

As for the turbo now, It has about 1.5mm side to side shaft play, axial seems minimal but cant really tell (or remember, was a little ago when I checked). No smoke at all, only on WOT I can see a smoke in the headlights of those unfortunately behind me. The smoke is mainly black, but there's a lot more visible when its nighttime and I can see the smoke in the aforementioned headlights. I believe my cats are cleaning up the smoke for the most part.

Sometimes when I turn the car off, I can see a slightly white smoke emit from the tailpipes, but again not too sure.

Stock turbo from the factory (173k kms, so like 106k miles or so).

If I drive the car like a normal sane person, it burns significantly less oil than when its getting beat on (PCV problem maybe?). I have ordered a new PCV valve to try and rectify it, hopefully it fixes it but we shall see.

Anyone got any ideas/input?


ENGINE/DRIVABILITY


Year/Make/Model: 2010 Mazda 3 MPS
Mileage: 173km/106k miles
Location: Perth WA
Concern: OIL CONSUMPTION
DTC's: (please include descriptions) none
Modifications none
ECU/Tuning Software: stock
Tuner: stock
Is the concern intermittent? no
Can you duplicate the concern? yes
Recent Repairs: VVT
Correction:________
 
Black smoke when accelerating hard is normal from the rich stock tune. What mods are on the car specifically intake
 
Do you have a picture of the turbo outlet?

Have you checked the pcv valve?
 
All the pictures I have seen of blown turbos were completely coated in oil so based on that picture I don't think that is the problem
 
Our CX-7 had the TMIC dripping oil, and puffing white smoke after idling 10 minutes. Like it was a locomotive. New turbo fixed it under warranty, as this was 15+ years ago.

The dealer also had to replace the primary O2 sensor as it was coated in a thick tar from burnt oil.

Also worth looking all around the motor for leaks. My demonically possessed Speed3 was pouring oil out when driving. Thought it was the PCV plate, but it was a failed head gasket. Only leaked when moving. No undertray and still not 1 drop on the ground.
 
I just ordered a valve cover gasket for my 2013 cx-5. Different motor but it's leaking all around so it happens as cars get older.
 
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