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I went out on a drive with the lead mechanic at the BMW dealer near my place to investigate some noises in my m135i. I got talking to him and he was explaining to me that they get people all the time complain about engine noise from the 2L Diesels.
He explained to me that it's all normal but it's apparently the direct injection which is causing the noise.
Not sure if this is the same in your case, but i thought it was worth mentioning.
Brian
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