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Part Number for AOS seal for AOS to engine block.

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I think that the early Boxsters (97 & 98) had the AOS with the round part that is on top situated horizontally. In 1999, they "updated" the design and the AOS now sported the round part in a vertical position. AFAIK, you can only buy the "new" version AOS and that may be why the AOS is (perhaps mistakenly) listed as being from '99 on in the parts list.

If the new one you purchased has the round part in a vertical position, it's the correct one.

Here is a photo, with a blue arrow pointing to the "round part" to which I am referring:


The part for which you asked the part number has a yellow arrow pointing to it.

Regards, Maurice.

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Part number on my AOS is 996.107.023.04

Here is a picture of the port in the block that the AOS fits into. Looks like some leftover gasket material?

I thought maybe the oil pump or cam cover was leaking but after I got it in the air I could see the oil was coming from somewhere higher on the block. Very small amount but it drips on the exhaust occasionally.

Should I be using sealant on the red rubber seal?


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No, you are not supposed to use sealant.

There is a grease lubricant that Porsche sold especially for this purpose. It's called "syntheso gelp grease" (part # 00004320468) and it used to be shown in the same parts diagram that showed an exploded view of the AOS. For some reason that tube of grease is no longer shown there. It was a 50 gram tube.

I bought a tube when I did my AOS, and did an AOS for about 4 friends. I now have enough left over to do about 500 cars. :eek:

I think that any rubber grease that does not attack rubber will serve the same purpose.

Regards, Maurice.

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