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I posted earlier this year about a rattling noise on my 2015 X5 3.5. The remedy for that was new turbo. Fast forward to last week: I took it back for a buzzing noise while accelerating with light throttle. CA calls to tell me that they can't find the issue so A BMW engineer is looking at my car. Engineer said to replace timing chain tensioner and all exhaust lifters?? All of this, and I barely have 10,500 miles. On the tensioner, I was thinking it would be just the external tensioner, but he said no, the whole front timing cover had to come off for replacement. NOT IMPRESSED with the cars reliability at all at this point.
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