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So my 2018 M5 started making this noise again recently, mainly a popping/creaking sound at low speeds with turning the wheel near full lock and particularly when going over uneven surfaces. Several years ago the dealership diagnosed the problem as bolts being loose that were securing the stiffening plate beneath the engine / subframe. I jacked my car up today, loosened all the stiffening plate bolts, and then retorqued them down to approximately 60 ft pounds. The sound is now gone, so it makes me think that these bolts tend to loosen and/or stretch over time. Just thought I would throw this out there in case people are having this problem recur like I have. If anyone knows the part number of the bolts, I'd like to buy some new ones to replace the old ones and use some loctite on the threads this time.
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