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Facelift C350 CDI - Oil Cooler Leaks

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Nick Carpenter, Nov 7, 2019.

  1. Nick Carpenter

    Nick Carpenter New Member

    Likes Received:
    Apr 25, 2018
    Your Mercedes:
    W204 2011 c350 ed125
    Hi all , appologies if this has been covered somewhere as I know in general that the oil cooler seal is a widley discussed topic.

    my question is , has anybody had any issues with the oil cooler seal leaking on newer models that may or may not have the new seal fitted already.

    I have a 80k nov 2011 facelift c350 with the 260hp om642 and today on its MOT my mechanic said that the drip tray was a little damp and there is a small amout of oil leaking from what appears to be the passenger side back of the engine , i recently changed the turbo seals as i had no record of these being replaced so wonder if its from prior to this or if it could be the oil cooler seals.

    Last edited: Nov 7, 2019
  2. Wighty

    Wighty Senior Member

    Likes Received:
    Aug 4, 2016
    Sunny Essex
    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Welcome to the forum buddy , yes it a well known issue with the om642 engine . I believe and don’t quote me but 2012 was when the new purple oil cooler seals got fitted . Despite this though it is still possible for the oil cooler itself to leak .
    Fingers crossed that it’s an old oil leak , maybe just keep your eye on it after cleaning up what you can .
    If it’s any help my 2009 om642 isn’t leaking yet (or at least wasn’t last week anyway !)
  3. Bubble

    Bubble Senior Member

    Likes Received:
    Feb 20, 2013
    Your Mercedes:
    E350 Coupe CDI / Land-Rover Discovery 4 / Nissan Skyline 650bhp R.I.P.
    One of my company cars is a September 2012 E350 265bhp and I thought that I would be safe with that month and year, but no, it had the old style oil seals, which leaked.

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