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I think each forum member has a different opinion on that!@ Do a search, and you should find many threads on the subject. Some swear by factory fill Mobil 1 0w40, but many( most? ) don't consider that to be a "good" oil anymore.
If you care about Porsche approval, the consensus seems to be Castrol Syntec 5w40. Of non-approved, a few like Red Line or Royal Purple, but I think Motul may be the best. ( I forget which Motul oil, but it's on LNengineering's web page)
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