I have another problem with our new 2000 E430. My wife says that after she turns off the car, the car rolls back a few inches. This is not just a slight movement. the dealer will not look into the problem. They say that they will allow 6 inches of movement and it is normal. To solve the problem, the dealer says, we can apply the emergency brake. With the gas/fuel gauge problem and this, did I make a mistake buying this car?