BMW X3 Diesel Problems

The diesel is fine around town. Being just three years old there shouldn't be anything wrong, so apart from overall condition of the body, paint, and interior make sure it has been routinely serviced.

You need to get to the bottom of what caused the failure in your engine. It is all very well to assume it was caused by the timing chain wearing and stretching, but until you actually establish that as the cause you won't get anywhere with the carmaker. Have an experienced engineer inspect the damage and if they believe it is caused by the timing chain failure you have something you can take to BMW to argue your case for compensation. You also then have the option of going to consumer affairs to get their help.