Hello! I just started replacing my guibo for my 99 z3 roadster, because of some clunking between 2 and 3000 rpm, and when I got the old guibo out I saw these chippings or whatever you might call it. The bolts holding the guibo were also kind of like this, looking like something had been rubbing on it, or chipping it or something. I really don’t understand what has happened. I find this super strange! Do anyone know what is happening and is there anything I could do against it, or should I just replace it?
Best regards Jon