What are the future problems of the BMW 650i?

The future problems? Now that really narrows down the possibilities. The biggest problem is running out of money once the warranty expires. The second biggest problem would be letting the wife or kids drive it.

Maintenance, maintenance, maintenance. These are very high maint. cars.

Electric seat motor and cables should go kaput. As will the drivers side electric window. The rear tailights will get water in them and quit. The oxygen sensor will quit leaving a check engine light on. The Bosch electric fuel pump IN the tank will quit as well, leaving you stranded. Get it replaced every 40-60 thou miles. The future problems? Now that really narrows down the possibilities. The biggest problem is running out of money once the warranty expires. The second biggest problem would be letting the wife or kids drive it.
Maintenance, maintenance, maintenance. These are very high maint. cars.
Electric seat motor and cables should go kaput. As will the drivers side electric window. The rear tailights will get water in them and quit. The oxygen sensor will quit leaving a check engine light on. The Bosch electric fuel pump IN the tank will quit as well, leaving you stranded. Get it replaced every 40-60 thou miles.