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Doesn't running with the oil level a bit too full also contribute to this?
I can see chronically extended oil service intervals being a factor, but atmospheric pressure at sea level causing repeated AOS failures?? That seems a bit of a stretch.
I sure wouldn't change this as a pm item unless I had a clear indication that the existing one was failing. It's just as likely that a new one could fail before the old one would have, and I have seen in other threads that there is apparently a fair number of them that come defective right off the shelf. Don't fix what ain't broke.
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'99 black 986
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