While driving experienced sudden loss of power. engine would rev normally but vehicle acted as if in neutral. i was able to move over to side of freeway safely. placed car in park and then shifted back into drive, and car behaved normally. after doing research, i have discovered that this is a common problem with this model. according to, http://jayauto.wordpress.com, mercedes is in a fight with its own suppliers because they produce a low-quality part. if you have problems with your 7-speed transmissions, please report it to: nhtsa. only this organization can enforce mercedes to do a transmission recall. in 2011, mercedes made their biggest profit in their history. however, i don't think they will use it to fix their issues with transmission. *tr