After reading the 6 series enth.companion,I was wondering if the US version of the M6(s38),have the same things that an owner of a grey mkt car should be wary of(oil starvation problems,the need to upgrade rotors from a 7 series,replacing the springs in the heads,defective camshaft profile by design,etc,etc) Any and all advice would be helpful before I invest.I love the looks and have read nothing but good things about the performance,but I dont want to buy something thats going to become a headache. Thanks