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Originally Posted by Tool Pants
The temperature related theory is interesting. However Peter Smith thinks it is due to cold air that causes the rubber diagraphram to split.
Unlike the Boxster, the separator on a 996 is heated by coolant. This is a 996 separator and you can see the 2 provisions for the coolant hose into and out of the round thing which is the diagraphram.
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I can maybe confirm this thoery about cold air ,as my AOS (2.7 987) failed on the coldest day of our winter so far ,it was -17c ,and the engine been running very rough since ,plus an oil drip down the back of the AOS ,the engine sounds like its either got an exhaust leak or induction leak or both ,plus slight oil smoke like one of those misting machines you use to get at 1980's discos
when calling a porsche center for the part they have had lots of orders for the same part ,the 987 AOS is a bit different from the 986 version and doesnt have the boot or the plastic tubes on the bottom but a hose (with one of those clips that are sometimes impossible to remove) and a spigot with an O ring ,also mounted / bolted differently