Let’s see. I have owned 2 E36 M3 models. Once was sold with a bad head gasket and one sold with a loose valve in the head. 3 E46 M3's two of which were good cars, one the plastic coolant line going to the expansion tank blew. 1 335i bought new in 07, 1 X3 that had a leaking valve cover which was fairweather. And just…