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Old 11-16-2006, 01:05 PM
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Location: Las Vegas
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Exclamation Oil in the Air Filter

I recently replaced the air filter in my 82 300D and noticed some oil in the air filter. After a few weeks I checked the new air filter and there's a little bit on that too. Also i've noticed some oil leaking from that side under the car.

Is this the turbo going out?

If so how do i check it?

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Old 11-16-2006, 03:05 PM
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Join Date: Aug 2005
Location: Palmdale/Ventura, CA
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I doubt it has anyhting to do with the turbo. So you are safe.

There is a return line for oil collected here that goes down to the crankcase.

Do get the engine clean on that side and watch carefully.

Either the return line is not seated or sealed, could possibly be plugged.

But to start with, remove the air cleaner housing and clean it all up,
study the tube that runs from the bottom of the air cleaner housing to the crankcase.
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
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Old 11-16-2006, 03:25 PM
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85 300D 4spd+tow+h4
Join Date: Apr 2006
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Blowby coming from the EGR. Another good reason to clamp that pesky EGR off.
1987 300D Sturmmachine
1991 300D Nearly Perfect
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1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
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Old 11-16-2006, 10:41 PM
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Just my Jeep and my S500
Join Date: Aug 2006
Location: Sacramento, Calif.
Posts: 581

The diaphram in your vacuum pump has a hole in it. I had an 80 300CD that had oil in the air breather too. Alot of it. Found out the bad diaphram was allowing oil to pass through it and get pumped to places where only air should go. Replacing the diaphram is easy. The pump is located on the driverside at the front of the engine. Lower side.
The bad news is that while oil was being pumped into your airbreather, chances are that oil was also being pumped into your vacuum lines leading into the passenger compartment. Look under the dash around the steering column for a vacuum dashpot. Pull the vacuum line from it and see if oil is present. If it is you may have to clean all of them and their lines.
I had to open up and clean alost all of my dashpots and replace the lines with those I got at the junk yard.
Good news though, after I got the job done my vacuum system, locks, shut off, etc, work so much better.


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