it's not self bleeding as there is a little screw near the thermostat. I hate bleeding the m30 also. I after filling up the coolant I take it for a short drive and see the temperature rising up, I get out and start bleeding for 5-10 minutes untill it goes back to normal operating temperature again.

Quote Originally Posted by icesoft
I was under the impression that the M30 coolant system was self bleeding, I've never had any problems getting mine to bleed the three times I've had it opened in the last year. If it doesn't bleed easy, check the small coolant line from the radiator to the expansion tank.