One problem related to engine noise has been reported for the 2011 BMW M3. The most recently reported issues are listed below.
While driving my low milage 2011 BMW M3 (42k miles) on the highway, out of no where, I noticed the car driving a little differently and slightly shaking. This happened moments before I reached my exit. I pulled over at a gas station right off the exit and opened the hood, the engine was making a tinging/scraping noise with each revolution. I closed it up, and drove to my home which was a couple minutes away. While driving, the noise was happening more in lower gears. When I got home, I looked under the car and saw it was leaking oil, and still making the noise. After some investigation, I learned the rod bearings in the engine had failed, resulting in complete engine failure. I purchased the car from an authorized BMW store at 38k miles in may of 2017, I always serviced it at my local BMW store - this occurred February 3rd, 2018. After reading up, I am learning that this is an issue with the s65 engines that are in this model of M3's. BMW has yet to make a recall, but they are aware of the issue. No action has been taken, but something needs to be done. I can't afford a new engine (it costs 30 something thousand dollars, which is almost as much as I paid for the car), and the engine cannot be repaired. I feel wronged by BMW, and advise the NHTSA to urge BMW to recall this engine to save future customers from catastrophic engine failure.