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Old 03-30-2005, 01:06 AM
Jimmy Joe's Avatar
peace out
Join Date: May 2004
Location: California central coast
Posts: 1,004
Crazy oil leak under air filter, non-turbo

I have looked at tons of threads about this, but they all seem to deal with turbo models.
There is a lot of oil leaking from under the air filter, can someone please point me in the correct direction for info on this?

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300CD '80 (now gone but not forgotten...)
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Old 03-30-2005, 01:25 AM
BoostnBenz's Avatar
Benötigt Mehr Druck!
Join Date: Aug 2002
Posts: 1,855
Is it just the oil seperator leaking? Perhaps a bad o-ring on it or the grommet where it goes down into the oil pan is bad?
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Old 03-30-2005, 04:25 AM
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Join Date: Apr 2003
Location: Philippines
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there is a black hose that goes underneath the air filter.. its a breather hose if im not mistaken.. check if it may have been dislodged.. had than happen to my 300 NA... i simply placed it back.

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Old 03-30-2005, 07:01 AM
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Location: Frederick, Md
Posts: 4,540
put screw down hose clamps on that hose and replace the large rubber seal from the housing to the manifold, that stopped the leaks on mine.

1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
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1986 190E 2.3-16
1986 190E 2.3
1987 300D
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past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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Old 03-30-2005, 07:28 AM
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Sounds like it's leaking from the breather hose, you probally need to replace the rubber elbows connecting it to the manifold. Mine had a very bad leak before I replaced them, now it's just a minor leak...
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Old 03-30-2005, 09:04 AM
jcd jcd is offline
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Join Date: Jun 2001
Location: Northern New Jersey
Posts: 1,102
Could be a torn vacuum pump diaphram. When mine tore the last time, it pushed a bunch of oil through the hose that connects to the top of the air cleaner.


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