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I've been told by independent Porsche mechanics and enthusiasts that a certain amount of nonmagnetic particle shedding is to be expected. Explicitly cleaning the sump can provide a baseline for comparing each inspection's results.
Magnetic metal can come from non-IMS places but in the end you really don't want any.
Other symptoms can inform your search for answers, cam deviation, chain noise, other types of trapped particles, etc.
I use a spin on filter to avoid oil bypass, magnetic plug, and Magfilter.
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