ML 270 CDI Oily intake


Active Member
May 2, 2018
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Your Mercedes
E55 W210 -00

A few weeks ago I was driving on the highway with cruise control on and when I tried to accelerate enough for it to do a kick down the car died, just completely shut off. Stopped and it started right up but I felt the idle was a bit rough, not very noticeable but just not as smooth as before.
Since then the car sometimes cranks 1 or 2 seconds longer than it used to and idle is sometimes a bit rough as well.

So took apart intake tubes from intercooler to egr and airbox going towards the turbo suction side a few days ago. Oil was dripping out of the egr valve and also from turbo suction side there was a nice little puddle.
Looked at the shaft and there was play side to side and up and down but not in and out as I can remember.
Maybe a bit to fast of a conclusion I ordered a turbo rebuilt kit ( around 150USD + gaskets and a few screws)

But after checking forums and also remembering a video I saw about the flaps on the intake im starting to change my mind.
Is it the intake flaps that are stuck or worn? Or the pcv thats maybe letting a bit to much oil pass?

Havent gotten the rebuilt kit yet but maybe not worth it?

Whats your opinion?


Senior Member
Apr 16, 2018
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Your Mercedes
ML270 2003
It's a bit of a common fault to have oil in the air intake to turbo pipe, Its caused by the blow by in the engine which then goes out via the PCV and to the turbo.
I have reduced (but not stopped) the oil by fitting a catch can.
One thought comes to mind, have you checked that the turbo activator is working and the vacuum supply to it is intact ?, this would cause your lack of power and grumpy idle.


Senior Member
Aug 25, 2006
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Midlands / Charente-Maritime
Your Mercedes
'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
As long as the play in the turbo is under 1mm there's no problem with it. As above, have codes read before throwing money at it.

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