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Premium Member
2018 X3 M40i / 2016 X3 xDrive35i
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1,632 Posts
Bad fuel injectors. Probably carbon buildup with poor spray pattern and weak atomization so the unburnt fuel after fires.

The cheap option is to try running a quality fuel injector cleaner through it for a couple tanks. Try 104 fuel injector pro. If that doesn't change anything for the better time to start planning for more work and money being thrown at it.
 
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