Good evening, I disassembled the engine of my S3 (Bhz Ea113) today and these pistons (in the appendix) were installed. These white on all 4 cylinders jumps on the piston shirt on the side of the piston (the impacts on the piston shirt come from the broken ceramic of the spark plugs). In my opinion, they did not withstand the performance (ca 550ps at 2.0 bar charging pressure) So now to my questions: Does someone have any other conjecture or idea which created the jumps? And someone knows about which I can’t find a brand or part number on the things.