One problem related to engine failure has been reported for the 2005 BMW X3. The most recently reported issues are listed below.
The bolt holding the timing chain together broke causing the timing chain to break which resulted in complete engine failure. The estimate to repair or replace the engine was $8322. BMW was contacted to help with the repair costs but refused to help repair the damaged engine. There are numerous reports of other BMW engines and Mini cooper engines manufactured by BMW which are having timing chain failure with catastrophic engine damage. I feel there is a design flaw with this engine and BMW should be forced to repair the damage and disclose the number of engine failures related to this design flaw.