E-Class (W211) 2003-2009

Oil leak, looks like right hand back of engine

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Old 07-31-2017, 10:15 PM
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2007 W211 E350 4Matic / 2008 X164 GL320 CDI
HELP! Oil leak plugs on back of heads

Just did the cam plugs and breather on the back of the heads about two months ago with a new intake manifold.
I had the oil changed the next week, but my trusty indy shop.

I just noticed a few drops of oil on the garage floor tonight, so when tomorrow I have to get out the inspection mirror and see what is up.

I am guessing it is one of the plugs or the vent, but it could be something else.

Anyone have new plugs and/or vent cover leak?

Last edited by N_Jay; 08-01-2017 at 11:00 AM.
Old 08-01-2017, 11:03 AM
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2007 W211 E350 4Matic / 2008 X164 GL320 CDI
Exclamation HELP! Update

Well, it is the pugs.
The vent cover is nice an dry, but all three plugs show some weeping, with the one on the right head building up to a drip.

I made sure it was in all the way, and it is, but it turns very easily.

What do people suggest to fix this problem?

Are OEM plugs better than aftermarket?

Is there a light sealer that should be used?

Help (Before my wife notices)!
Old 08-01-2017, 01:47 PM
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Mercedes
Originally Posted by N_Jay
Well, it is the pugs.
The vent cover is nice an dry, but all three plugs show some weeping, with the one on the right head building up to a drip.

I made sure it was in all the way, and it is, but it turns very easily.

What do people suggest to fix this problem?

Are OEM plugs better than aftermarket?

Is there a light sealer that should be used?

Help (Before my wife notices)!

The OE plugs are inexpensive enough that I typically recommend only using those. You shouldn't be leaking so soon after installation what brand did you use? I produced a video a few months ago showing the installation at this link:

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Old 08-01-2017, 02:05 PM
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2007 W211 E350 4Matic / 2008 X164 GL320 CDI
Originally Posted by FCPEuro
The OE plugs are inexpensive enough that I typically recommend only using those. You shouldn't be leaking so soon after installation what brand did you use? I produced a video a few months ago showing the installation at this link:

https://www.youtube.com/watch?v=wtSdVeqQ3lU
I think that they may have been aftermarket. I had collected parts for the job over a period of time, so I don't recall specifically.

I have ordered in a set of OEM and hope they do better.
Seems the MB instructions are to put them in dry, but some have recommended a sealant.

Anyone have suggestions?
Old 08-01-2017, 02:23 PM
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Mercedes
I've had no issues with dry installation.

--Kyle

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