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Old 11-15-2006, 08:52 AM
Registered User
Join Date: Mar 2006
Posts: 19
Please help me pinpoint oil leak..

Hi all,
Please see the attached photo...angle is from the passenger side looking forward at the back of the bell housing/ rear main.
On my 2000 E-320(WITH 49K),I discovered this.It is oil, not trans fluid.
It was about to I cleaned it off.
The photo was taken after I then drove 2 days/100 miles.
I appears to be coming out of the "vent" and not the actual seal in front of that.
Any Ideas???
What would/could cause a relatively new, low mile car to start this?
How serious is it?
How big of job ($$$) to fix?

Attached Thumbnails
Please help me pinpoint oil leak..-img_0001.jpg   Please help me pinpoint oil leak..-img_0002.jpg  
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Old 11-15-2006, 10:52 AM
Johnhef's Avatar
Senior Member
Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
look up inside the bellhousing at the front of the trans and at the rear engine seal. one of those is likely your culprit. Judging by the color and the car's age/mileage I'd say thats trans fluid but it does only seem to be toward the engine side so it may be oil. hard to tell from that picture.

1980 500SE/AMG Euro
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1983 500SEC/AMG Euro
1984 500SEC
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1986 190E 2.3-16
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1987 300D
1997 C36 AMG
2003 C320T 4matic

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Old 11-15-2006, 12:18 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
i am working on the same v6 engine in the c class.same year same problem.the plate that holds the rear main oil seal was cracked due to the bolt that holds the excentric weight on the balance shaft coming loose but i am replacing the seal as well[needed a new plate but was in stock].
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 11-16-2006, 01:25 PM
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Join Date: Sep 2006
Location: waipahu HI
Posts: 30
That is likely the rear main seal. Pretty classic. But i'm not experienced on the MB so much.
1986 300e (runs like a top.. interior needs parts)
2006 GTO
2003 Mini S
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Old 11-18-2006, 03:42 PM
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Join Date: Mar 2006
Posts: 19
i just was able to get a good look inside...found nothing that indidcates where its coming from...everything inside the "vent" looks dry
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Old 11-18-2006, 03:48 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Would agree, probably main seal or the plate the main seal presses in to. Does look a bit more like ATF to me too though. I don't "think" your torque converter has a drain plug, but if you want to double-check, possibly that plug might be dribbling a little and slinging the fluid around inside the bell housing, that would explain why you can't find where it's coming from. Bottom line is that if the car doesn't "leave it's mark" on the floor or driveway overnight, probably not worth pursuing IMHO.

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