Originally Posted by The Beast
If you have comfort access you can start the car and then lock it with the remote, I used to do this with my X5 in order to warm the interior on cold mornings. Two benefits, you don't forget the key and someone can't just jump in and drive away with it while it's unattended.
Both 2013's X5 and 535. Just start, take fob and lock doors. Works great.