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If they are hard plastic they are from your chain ramps / wear pads.
To get a better understanding of the amount wear, the next step would be to drop your oil pan and inspect the debris - probably at the next oil change.
Do you have a Durametric to check the camshaft deviation - another indication of ramp wear.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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