Turbocharged engines are always going to be less reliable. More parts, and more stress on those parts. When it comes to BMWs, years down the road when turbos need replacement, the cost to do the work will be higher than most; likely more than the car is worth.

BMW has been engineering the disposable car for a while now, starting with "maintenance free" transmissions, then countless electronics. Up until now, at least the motors were still good for up to 200k miles. Not anymore.