Hi, I have a 2013 528i S Drive. Upon leaving my house and accelerating up to about 40 MPH the engine started making an odd noise and losing power. As I was looking for a place to pull off, turn around and head back to the house, it suddenly chimed and put itself in park. As I coasted off the road, I could hear the parking pawl clicking and as soon as the car stopped, the engine shut off. I tried to start the engine again but as soon as the starter engages, all of the power goes off and the engine fails to move at all. I towed it back to the house and have not had a chance to try to turn the engine by hand with a wrench on the crank. My question is if the engine is seized, is it more cost effective to pull it and rebuild it or simply buy a reman long block and replace it.

Thanks