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The startup rattle is usually just timing chain and not IMS. Changing to a 5w40 from 0w40 oil improved my rattle. If IMS worry is causing you to lose sleep at night, upgrading the bearing is pretty straightforward and not too expensive. It also has fewer side effects than Lunesta.
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2021 Cayman GTS 4.0L
2020 Macan (dog hauler)
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