Quote:
Originally Posted by BMW5and7
Without factory hitch, the maximum towing capacity is 5,400 lbs for the 40i and 5,950 lbs for the 50i.
I am not quite sure if they have the same towing capacity if both are equipped with towing hitch. I know that my 50i has 7,500 towing capacity though with towing hitch. Not sure about 40i with towing hitch.
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per the manual 40i and 50i's towing capacity is same.