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I have an m235 and have been meaning to post about issues that seem similar to yours. When on bumpy/uneven roads at low speeds I get a rumbling noise almost resembling a bad wheel bearing(blown strut noise is also a good comparison), but the car feels completely fine. I have only just noticed this noise so I have not played around underneath my car like you have, but now that I think about it, I notice it the most when driving straight. I'm also in the same boat as my regular warranty just ended and I'm now under CPO. My car only has 25k miles, any failed suspension parts would be odd, especially considering it feels just like normal. Would also love to know if someone has gone through the same thing and resolved this noise.
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