We call the X5, The Truck. It seems silly saying X5 for everything.

Hun can you leave me the X5 today?
I need the X5 to go to the Nursery.
Did you drive the X5?
I just bought some stuff from Restoration Hardware can you bring the X5?
Can you move the 528 and the M235 so I can get the X5 in the garage but be careful not to hit the 135is.....
Lets Take the X5 to the Golf Course.

It sounds pretentious and snobby which is not us.