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BMW (and all makers) specify a minimum thickness for rotors before they need to be replaced. So yes, they can be turned if they are still above the minimum. It's not nearly as common a practice as it used to be. As for the uneven wear, that's a lot of difference. I'd have whoever does the work check the operation of the calipers carefully. The one on the "thin" side may be sticking a bit, or the one on the "thick" side may not be working as intended because of air bubbles in the fluid on that side, or both. Also, as stated above, make sure all the slides points are well lubricated. I think some mechanics don't pay a lot of attention to that step.
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