I have been to three different dealerships plus the MB dealer, and I've been lied to. I've been told thats its tire noise, rear gear whine, and exhaust drone. Trying to get this fixed can get so stressful at times, not to mention trying to work 40+ hours a week and go to school for 14, I have to take a break from the dealerships and deal with life. It easy to just go to your dealership and say "I've got a rear end whine and the rear end needs to be replaced or repaired, but its not very easy to get them to say, ok when would you like to bring it in. They don't have to report there findings when it's over the posted speed limit. They just simply say it can't be duplicated. I've found that they don't even run the car on the interstate instead they put it on the rack and spin the tires at 80 mph.