Any problem with either the control arms or thrust arms can cause this. In addition to the thrust arm bushing, check the ball joint at the other end of the thrust arm, an the ball joint on the control arm. One way to check this is to have someone turn the steering to full lock while you watch the ball joint. At full lock, a bad ball joint will move a bit.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp