i have to agree with the positive replies,ive had my 2006 4.4 for 1 year.i live in northern alberta,and it was -50 this winter for 2 weeks and the x ran flawless.no frozen door locks,no blown valve cover gaskets,nothing.like any other brand some guys happen to get the one built on friday before a long weekend.there are thousands of x5 out there that run great,but remember this a forum that will make you think they all have big problems,thats what its for.