I have 2003 X5 6cyl. when I first start the car from cold, there is a loud whining/whirling noise for the first few minutes. Eventually, I can here this shut off and whatever is spinning slows down and the noise fades away. What is this... just so I know what to look out for. It's definitely different from the whistle I have at about 2k RPM, when its colder out. I think that is a crack somewhere in my vac intake line (throws the lean error code every 6 months or so)... I am going to fix that too.