We have exactly the same problem on our 24 mth/24000 mile 2.0 d auto however on our car it is intermittent. I would describe it has an harshness in the engine sound however it doesn't have any affect performance.
I have spoken to our local agent who tell me they haven't had a problem with any other x3s.
I now just need to be able to replicate it when it's next in for service.
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