Water pump impeller material? Even though the color also seems wrong for that.
AFIK the chain tensioner pads and the impeller is the only plastic in the engine that can be ground to pieces and enter the oil.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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