I'm at 67K and I need to do a backflush on mine. I'm wayy over due and yes its the original. I think i'll convert to the dexcool premixed 50/50. My temp gauge is running a little hotter than usual. I usually stays stable at the "N" and the "O" and now it goes as high as the "M" and the "A". My Dad told me that it could be the thermostat. Could that be the problem or is it the coolant?? I'll probably swap that out when I do the coolant.
