My new 300td turbodiesel wagon is going to need some new rubber real soon. This is my first benz and without a doubt, the heaviest car I've ever owned, which may affect my choice in tires. I'm thinking the car's weight will allow me to use a more traditional touring type tread instead of an all-season that has widely spaced, aggressive anti-hydroplaning grooves and blocks. The goal is a quiet, smooth ride with rubber that'll last at least 40 or 50,000 miles. So far, the Michelin X-one is the tire I think I'm going with. Comments and experiences about tires you've used??