I had 12,000km with my metzelers m5 and I replaced my rear tire with a metzeler m7 rr, big difference, it is special designed for more miles and softer in cornering, simple incredible.
my Rc marks hight coolant temperature, do you have this kind of problems, I think that this problem is due because sometimes the fan works, sometimes dont, in ktms agency say that all is working properly even the thermostat. what do you think about that