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2011 E350 oil leak

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Old Dec 10, 2020 | 12:45 PM
  #1  
PlacidMind's Avatar
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E350
2011 E350 oil leak

Hello everyone,

this is my first post

There is some oil leak behind the main engine and i can smell the burnt oil fumes inside the car on occasions. On the left hand side behind the engine i see some oil deposit on the oil separator, which i plan to change, but on the right side behind the engine i see a cracked part with oil deposit. I am not able to identify this part so can someone help me with that. Attaching pics.
also comment if this needs to be changed.

Oil seperator

Unidentified part


thanks much !
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Old Dec 10, 2020 | 01:00 PM
  #2  
cetialpha5's Avatar
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2008 E350 4Matic, 2011 E350 4matic
No idea where that part is but normally you'd replace the breather cover and the oil separator. The separator is reverse threaded so loosening/tightening is the opposite. There's a whole breather kit out there and the plugs get replaced too but your plug on that side doesn't look like it's leaking. There's also two plugs on the right side and it could be one of the engine plugs that are leaking. FCPeuro sells a kit with all those parts, but they're cheaper elsewhere if you get them directly from an MB dealer that sells online but you do get their lifetime warranty. Might be a long while before they go again though and you might not be able to cash in on the warranty.

https://www.fcpeuro.com/products/mer...515810#fitment
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Old Dec 10, 2020 | 01:37 PM
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'11 E350, '11 E550, '98 M3, '95 E320
The second picture looks like a vacuum plug... OP, can you take picture further away to get a sense of where it is on the engine.
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Old Dec 10, 2020 | 02:41 PM
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Looks like you have a hairline crack at the base of vacuum pump. If not, may simply need to clean pump & cap. Plug & play replacement if needed.






Attached Files
File Type: pdf
272, 273 install centrifuge.pdf (365.8 KB, 276 views)
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Old Dec 10, 2020 | 11:53 PM
  #5  
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E350
Thank You guys for exceptional support !

That is indeed Break vacuum pump. Already ordered the parts and gonna pay $100 labor for installation.
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Old Dec 29, 2020 | 11:25 AM
  #6  
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DIY, see attachments.

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File Type: pdf
install vacuum pump.pdf (346.6 KB, 424 views)
File Type: pdf
Air filter housing.pdf (162.7 KB, 88 views)
File Type: pdf
install air duct housing.pdf (252.7 KB, 105 views)
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Old Apr 22, 2026 | 03:57 AM
  #7  
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W212 2011 e350 4matic sedan oil leak

Hello, my 2011 MB E350 4matic has oil all over the front of the engine likely from the fan and serpentine belt flinging it everywhere which also caused my serpentine belt to come off. Any suggestions on where to look and how on earth do I clean all this up?
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Old Apr 22, 2026 | 07:30 AM
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