Well, did my bi-annual drain, flush, and fill this afternoon. Why is the M30 so damned hard to successfully bleed (or is it just me)? Did coolant in 3 vehicles, the water system in the RV, and my pressure washer pump, and out of all of them the BMW was the only one that gave me the least bit of trouble. Didn't think I was ever going to get all the air out of that thing.