Quote:
Originally Posted by JFP in PA
At speed, your cam covers have a lot of oil in them; add G=loads in corners and some of that liquid oil can get sucked into the AOS system (which has a vacuum line running to each cam cover). While the AOS can handle some level of liquid oil, it cannot deal with a flood, and more than normal vapor gets sucked into the intake.
Porsche had been aware of this for a long time, and actually produced an exotic and hyper expensive kit (read $10K+) for the heavily tracked 996's to help limit it. Amongst other things, the kit contains a "north west passage" oil recovery system which consists of additional oil scavenging pumps in the cylinder heads with lines to run the oil back to the sump. Unfortunately, this kit was never made available to fit in a Boxster.
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" Adding a catch can will only coat that as well."
I had hoped that someone(Stelan?) would publish a diy catch can solution by placing a Catch Can ahead of the AOS to divert liquid oil direct to the sump. From what JFP and Porsche R&D have discovered it seems unlikely that a cheap,simple catch can would be effective?
see post #8 in this link to a previous discussion:
http://986forum.com/forums/general-discussions/60203-new-aos-failing.html
So time to investigate other contributory factors like lack of anti-foam additives in the engine oil?