2008 E320 Bluetec 140000 km: oil leak from drain hole
Mechanic who found the leak does not know what's causing the leak.
Does anyone know what could be the cause of the leak?
Thx.
For 2008 MB transmission oil is red.
If it is leaking from an oil drain hole change the copper washer and see if it helps.
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They said there was a leak at about the place described here. Said it is the oil cooler.
They quoted $3600 to replace the oil cooler assembly.
I looked up the oil cooler seals at Pelican Parts, $5.00.
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They said there was a leak at about the place described here. Said it is the oil cooler.
They quoted $3600 to replace the oil cooler assembly.
I looked up the oil cooler seals at Pelican Parts, $5.00.
I pulled the plastic pan off under the engine and it was clean last week.
Note to self - don't do anything with this car without careful research!




I pulled the plastic pan off under the engine and it was clean last week.
Note to self - don't do anything with this car without careful research!

I had a similar issue.
I got the oil cap on my GL320 a bit lopsided and it spit out about 1/2 quart or more of oil on a 200 miles drive.
The oil was all over the bottom of the engine and well soaked into the padding.
The dealer was "sure" I had a bad oil cooler seal.
I may have a few slow oil leaks but nothing that NEEDS $2K in repairs (yet)
Parts guy said the cooler has been redesigned with higher temperature seals.
I think the better mileage of the diesel is offset by higher maintenance costs so I went with gas for the new one. I'm keeping the diesel though.
And last month I had to replace the AdBlue tank heater for $1,500 to get rid of an annoying CEL



