S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Help me identify this leak!

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Old 11-25-2014, 05:54 PM
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2008 S63
Help me identify this leak!

So I noticed a burned oil smell coming from the front end every time the car starts to heat up. I took a look at it and behind the passenger side air box in between the firewall I can see a leak with a perfect path to drip on to the catalytic converter with evidence of burned oil. Where could the leak be coming from? This black plastic device? Or some sort of O-ring that needs to be replaced? Has anyone seen this before? Can anyone identify these parts?
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Last edited by Zerocarpileup; 11-25-2014 at 05:56 PM.
Old 11-25-2014, 06:15 PM
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2008 S63
Could it be these cam plugs? How so I know it's not this centrifuge thing?
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Old 11-25-2014, 06:28 PM
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I'm convinced that this is my culprit. Does anyone know how many cam plugs on my 2007 s550 base 5.5? I hear they are only on the passenger side. Part numbers?
Old 11-25-2014, 07:01 PM
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Originally Posted by Zerocarpileup
I'm convinced that this is my culprit. Does anyone know how many cam plugs on my 2007 s550 base 5.5? I hear they are only on the passenger side. Part numbers?
This may help...

https://mbworld.org/forums/s-class-w...sion-plug.html
Old 11-25-2014, 07:05 PM
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Thank you very much.

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