That M5 ran cool from the day I bought it. In fact on the ride back from AZ. I called the previous owner to ask him if everything was okay. I was running at about 110 mph at it was cool as can be.... The faster I ran it the cooler it ran. It was that way for the entire time I owned it. I have never heard of this as a problem to have it run cool?
Hope all is well...Mike

I know, they run hot. Well, now that we have had some very cool nights in the 40's, the car will not warm up.. Perhaps the previous owner took out the thermistat?? (Mike, You Out There??). The needle will go to 12 O'Clock at idle.. But once driving it slowly drops just right past the blue (Still in the blue last night). If I put the heat on in the car, you can feel that it is cooler. Any thoughts?