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Old 05-31-2000, 08:05 PM
Subman's Avatar
Senior Member
Join Date: Apr 2000
Location: South Florida
Posts: 447
There is always oil in the air cleaner of my 1980 300D. It dose have 144K on it, but the head was taken off, valve gides replaced and cleaned out (due to oil in the intake from a broken gasget in the vacume pump, but that is a whole other stoy). The original air cleaner has been replace with a new one (old one broke). If this matters it is a California car, the valve case vent goes into the air intake to get rid of the fumes. The head was done 9K ago and the air filter is oily and dirty.
Is this normal?? What can I do ??
I have had a sugueston to rig the vent to a pipe going to the bottom of the motor and venting the oil and gasses onto the ground. I dont like this idea to much because it is bad for the enviroment and I will lose some oil.

Thank You for any suguestions.

-1999 ML320
-1995 E320
-1994 E420 (lowered 1.5 in useing Eibach)
-1980 300D
-Had 1985 300TD Wagon (for over 10 yrs)
-Had 1993 190E 2.3
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Old 05-31-2000, 08:19 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
You gots excessive blowby. Have the compression checked.

Jeff L
1987 300e
1989 300e
1987 BMW 325
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Old 05-31-2000, 08:38 PM
Subman's Avatar
Senior Member
Join Date: Apr 2000
Location: South Florida
Posts: 447
I checked the compression before the head was off. They were all within specs. Are you saying that the oil is comming out through the head and up the intake.

[This message has been edited by Subman (edited 05-31-2000).]
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Old 05-31-2000, 09:17 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
This is quite normal and we see it often. You do have blow-by, but all of these do...I have gone as far as to seal the little can that is inside the aircleaner so the seams on the clamped top do not leak oil. Then the oil will just drain into the pan.

Caution!!! Do not block the blow-by hose!!! This will blow out seals.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
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Old 06-02-2000, 10:19 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Compression test will not check the rings. Have a leak-down test done. Oil in the air filter was the beginning of the end for our beloved 300D.

Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's
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