B-Line

I need to find the tow capacity of the X5 4.4

I went to the BMW site and it said the capacity was 5000lbs. But it also said the 3.3 was 5000lbs.
then I read somewhere else it was 6000lbs.
then I looked up the new 4.6is and it said the tow capacity was 6000lbs.
So, I'm trying to figure out what the tow capacity is on the 4.4X5 thanks.