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I typically have gotten 40-50k miles from an AOS (sample size: 2). This is one of those places (unlike brakes for example) where I pay the premium and use factory parts. do you know what brand of AOS was installed? If it was installed by a Porsche dealer then it is almost certainly a Porsche part. If it was installed by an Indie or yourself that's not a given. When I take my car to my indie that's a discussion we always have before any work is done: the origen of replacement parts.
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