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I own a 2016 E400 4-Matic (US spec). Currently at roughly 115k and it’s been treating me well so far. All factory recommended services have been followed since new.
However, I recently started to experience oil consumption, roughly 7k miles into the 10k mile change interval. Have had to add roughly a quart since last oil change. Started digging into this and found oil in the passenger side turbo inlet.
My suspicion is that the PCV system is letting through more oil than it should. However, appears to be a pretty significant job to replace it all.
Question: Is it worth trying to just change the oil drip pan and/or separator at the rear right of the engine to see if that fixes it? Or am I better off replacing the entire PCV?
Also, anyone who happen to have workshop guides for this job?
Appreciate the input. Any potential harm done to the turbo system by oil getting in through the inlet pipe?
Found a pretty large puddle of oil.
oil in intake is not radically bad nor good... it ends up deposited on the intake valves and dirty Lambda sensors.
PCV needs service and so does Bosch HPFP + roller bearing.... so got to bite the bullet with realistic expectations.
Shorter oil intervals are adviseable on all hot engines.
Master Surya knows everything about your engine type.
Last edited by CaliBenzDriver; May 30, 2025 at 01:18 AM.
If your ENTIRE PCV system is not yet renewed, better do so at this mileage and age.
M276 3.0 Turbo has 2nd stage extra fine oil separator, unlike M276 3.5 NA.
The one below , middle long slim box shape I labeled B.
.
M276 3.5NA only have label A as PCV.
C pipe goes to RIGHT BANK TURBO only, for you it is passenger side.
That is why you are seeing oil at RIGHT BANK turbo only ( correct ?) and not LEFT BANK turbo too.
Aside from possible oil sealing leak at the turbo itself, I am sure it is the PCV system already aging.
For turbo oil leak see this post : https://mbworld.org/forums/e-class-w...o-complex.html
D pipe goes to dual check valve number #71 in above animation picture.
This post explains how D the dual check valve works and its importance : https://mbworld.org/forums/e-class-w...leak-path.html
and you will get the dual check valve when you buy below or the entire PCV system in first sceen capture, including oil drip pan.
Replace all these : Item 3 is the same as above photo, where you get the dual valve
I will let you know the easiest way to access the fine oil seperator.
All blue 3m masking tape used on removed connectors or hose. This way you will not dirty them and they are markers for what is disconnected.
Black on black is easy to miss, example sensor connectors.
The only dumb-azz MB did was to NOT have a small interconnector for AC compressor valve I marked red, but MB is kind enough to have long wires,
thus you can lift entire wire assy plastic box and ECM like below :
On BANK 1 or RIGHT BANK, there is an interconnector, that helps. Big grey to black connector.
.
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2022 archive, while doing intake valves cleaning. You best check yours too.
The boxy fine oil separator is under these two intake manifold plastic adapters. Orange circle I mnarked.
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Intake valve cleaning is you want to read : Here also explains the wire to the AC compressor ......why I hate it so much. I plan to install my own interconnector. https://mbworld.org/forums/e-class-w...eaning-p2.html
Have fun.........
.
Last edited by S-Prihadi; May 30, 2025 at 01:40 AM.
Here is the WIS, I give u important ones.
Do remember that Mercedes WIS often goes far out removing more stuff than necessary, visual inspect what you need and I will get more WIS.
I personally have not remove my centrifuge ( Bank 1 rear PCV system ), but has removed my HP fuel pump.
HP fuel pump shield you must remove to access centrifuge which I label #18
.
The HP fuel pump plastic shield and its metal bracket
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I found my old photo of the fine oil separator box thingy
It is not a fun DIY to remove complete PCV of M276 3.0 Turbo
Azz view of our engine other components
.
Last edited by S-Prihadi; May 30, 2025 at 01:36 AM.
Reason: ADD INFO
Thanks so much to everyone who have responded to my post, particularly @S-Prihadi's contribution. Much appreciated!
I need to review and digest all the information and come up with a plan of attack. Definitely not a quick and easy DYI, but seems doable with some good planning.
That turbo inlet pipe in the video was really gunked up. Mine does not look even close to it. But a reminder that it will eventually end up like that if not addressed.
I own a 2016 E400 4-Matic (US spec). Currently at roughly 115k and it’s been treating me well so far. All factory recommended services have been followed since new.
However, I recently started to experience oil consumption, roughly 7k miles into the 10k mile change interval. Have had to add roughly a quart since last oil change. Started digging into this and found oil in the passenger side turbo inlet.
My suspicion is that the PCV system is letting through more oil than it should. However, appears to be a pretty significant job to replace it all.
Question: Is it worth trying to just change the oil drip pan and/or separator at the rear right of the engine to see if that fixes it? Or am I better off replacing the entire PCV?
Also, anyone who happen to have workshop guides for this job?
Thanks!
Is your passenger side exhaust louder than normal because it is burning oil? I have this issue and suspect the pcv system as well.
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