Brand new Air Oil Separator Failed!?

[Jay Laifman]

I had my AOS replaced about 6 months ago, and it failed again this morning. I assume the shop is going to adjust the price for having to do it again. But any thoughts on this? How could a new one fail so quickly? Is there anything the engine can do that can weaken the AOS or cause it to fail?

I did replace it once before myself. Probably 15+ years ago.

[CarGuyNeil]

One actual cause is overfilling the oil. More likely is that they used an aftermarket part. I seem to read a lot about the aftermarket AOS failing a lot sooner than the Porsche part.

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[Jay Laifman]

Thanks!

FYI, this is a high mileage, well cared for 2000 S.

[CarGuyNeil]

Love that color combo.

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[Jay Laifman]

Update. I called the shop. They did not replace the external AOS earlier this year. They replaced an internal AOS. So it looks like an old fashioned, old AOS failure. What a bummer.

I got this AOS from the Porsche dealer directly, probably about 15 years ago.

​​​​​​​So sorry for the misdirection.

[CarGuyNeil]

At least you found out the answer.

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[stealthn]

What’s an internal AOS?

[JFP in PA]

The two can like structures in the corners of the sump, they help remove the air from the oil returning to the sump.

[stealthn]

Huh, learn something new every day. Thanks!

[CarGuyNeil]

Originally Posted by stealthn

Huh, learn something new every day. Thanks!

Me too! I didn't know that it had an internal oil separator.

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