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Intermittent oil drip from AOS line...?

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Hi all,


I have an 02 996.2 Targa that has a leak / drip only when taking a sharp left turn. It is up high at right rear, I think it is the aos oil return line vent, if such a thing exists...


It drips from above the cylinders, so not spark tubes. I believe it is coming out of the little vent at the end of the aos line. The little vent in the pic basically points towards the a/C compressor ( I think that is what it is). The oil does at times end up on the exhaust creating a bit of smoke and smell which is not cool. 


Is it normal for this line to have oil liquid in it? The oil level is right at full. I believe full oil level constructed to the problem. Any advice on the problems and solutions appreciated. 



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You should be running the car one or two bars below the full mark on the electronic display.  I would also seriously consider replacing the AOS unit with a new factory unit, they are known for not liking liquid oil in the diaphragm area of the AOS system. I also am not aware of any atmospheric "vent" in the AOS, so check to make sure something is not connected properly. 



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I had oil residue in that area above the spark plugs and on top of the right rear cylinder head.  That corrugated line, It. 4 in the diagram posted, apparently had some minute cracks in it and was seeping.  I replaced that line and solved the problem.  Admittedly, I replaced the AOS at the same time so can't say for sure it was just the oil line but it had to contribute for the oil to get to that location.

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Actually there is a atmospheric breather port on part #6 above, which looks to be it in your picture.  It could be as simple as replacing that part and with a new O-ring.  It could be the spring inside is old and worn out. 99610704751 Double check this part number for your Targa.



Edited by DBJoe996
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