 Don't buy Mercedes. I have S550 and GLK350 Both purchased new.  The S550 got very bad transmission when shift in automatic from 2nd to 3rd gear.  Engine vibrate and shake the whole car when unexpected.  Rear tires only last 10K miles. it always wear out in the center, I use recommended tire pressure of 35psi.   GLK350 Very bad paint job.  The clear coat got dust all over the car.  The hood gap on left and right are at least 1/2 different.  It's a brand new car, this kind of gap only happens on car with front end accident.  You don't expect these problem from brand new Mercedes!  