I've had 9 different BMWs. Each one of them has had some sort of "peculiar" engine sound. My '11 X3 is no different. It almost sounds like a diesel to me. In the past, I've had several BMWs with rampant "ticking" in the engine. I took each of them into the shop and was told there was no problems. It drove just fine.
If I were you, unless it's something highly out of the ordinary, I wouldn't worry about it. Having had so may BMWs, I can assure you strange engine noises are very typical (depending on the model).
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