I just purchased a 1999 430ML w/70K miles. The original owner seems to have taken very good care of it and drove it mainly on the highway. He said the current Michelin Cross Terrain tires were more noisy than the original Dunlops. After driving it, his opinion seemed logical. I have never driven an ML before, so I have no reference point. The ML drives very well, but the road noise sounds more like what you would hear from a pickup truck than from a car. If this is normal, I can live with it. However, I thought if I replaced the tires it would become much more quiet. Yesterday, I put a new set of Continenental 4X4 tires and the rolling "roar" didn't improve very much. I would like to just feel O.K. that this is normal and I don't have a bearing that is abnormal somewhere. Can anyone give me some advice? Do I need to have something checked?