Good chance the AOS is geting weak. It would concern me that the shop owner didn't say that & test it to confirm. If he has the tool to do the test it takes about 10 minutes to find out. If he doesn't have the tool that indicates he is not a water cooled Porsche specialist, which call into question how well it has been maintained.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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