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Oil Leaking from Oil filler cap

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Oil Leaking from Oil filler cap

  #1  
Old 05-17-2010, 01:09 PM
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Default Oil Leaking from Oil filler cap

98 A6 Quattro 30V, 151K

I have oil leaking out of the oil filler cap. I have replaced the rubber gasket and the oil filler cap itself. Any ideas as to what else could be causing the leak? Is this a common issue? There was not leak for months after I replaced the cap but the leak is back.
 
  #2  
Old 05-17-2010, 01:15 PM
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How much oil is leaking?

If it is just a little - live with it
If it is a lot begin looking for a stuck PCV valve or excessive wear on the cylinder walls causing blowby.
 
  #3  
Old 05-17-2010, 01:31 PM
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I can smell the oil burning and I can see the leak from the cap.
 
  #4  
Old 05-17-2010, 01:49 PM
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Audi release a new oil cap a couple years back that solved this issue. It vents properly. I had to change mine a year or so ago, my pcv system was plugged, and after changing that, it got better but still leaked. I picked up the new oil cap and the problem was solved. @ your mileage, replace both.
 
  #5  
Old 05-17-2010, 03:17 PM
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I replaced the oil cap with the new one and I am still getting the leaks. Also I tried to see if the pcv valve was bad and I was told that the car did not have one.
 
  #6  
Old 05-17-2010, 04:27 PM
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Originally Posted by copper07 View Post
I replaced the oil cap with the new one and I am still getting the leaks. Also I tried to see if the pcv valve was bad and I was told that the car did not have one.
It does, but not in the traditional sense.

see here :http://www.partsgeek.com/catalog/199...ther_hose.html
 
  #7  
Old 05-21-2010, 05:19 PM
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Originally Posted by Jeffla View Post
It does, but not in the traditional sense.

see here :http://www.partsgeek.com/catalog/199...ther_hose.html
So you replaced this part on your car and you didn't have issues anymore?
 
  #8  
Old 05-22-2010, 12:00 AM
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Yes.

I replaced the breather hose and the oil cap and no longer had a leaky oil cap.

I find it odd your new oil cap is still leaking. Is it leaking around the seal, or out the breather hole in the top of the oil cap?
 
  #9  
Old 05-24-2010, 01:12 PM
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It is leaking out of the seal.
 
  #10  
Old 05-25-2010, 12:14 PM
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There are vented caps that function as pcv - open air.
 

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