WB do not wear out they can go a million miles. They get damaged from Impact. Especially likely if you hit a pothole during a curve.

BMW has an advisory to preemptively replace any wheel bearing of a wheel that was impacted in an accident. That speaks volumes in regard to failure mode.

At 170 you should have already replaced the intake cam sensor and coming up on exhaust, the alternator, fuel pump, disa valve and the FPR. The Siphon jet usually lasts about 5-7000 hours. You should have also replaced the coolant reservoir by now.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)