If anyone wants my old control arms to put new bushings in, I'll make you a deal.

I think that heat accentuates the failing bushings. This morning, when my mechanic checked out my X, we only got it to make the thump noise once, but he could see the play in it when looking at it while I turned the wheel. Temps were over 90 F here today, and when I went to run some errands late afternoon after it was out in the sun all day, it was making that sound on every turn. I assume this is because the rubber softens in the heat.

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Tim in Indy
2014 xDrive35i