Hello All: I am a, "NEWBIE", to the site and was curious with this topic. I have a 2011 LS460 AWD, Manufactured Feb.'11 and purchased Apr.'11. My LS currently has 7980 miles, standard Wheels, with Bridgestone Turanza EL42 P235/50R18 97V tires. At about 4000 miles I noticed that there seemed to be a slight vibration when the car was cold the first few miles of driving. I took my LS to the dealer for inspection and was told that the car was heavy and when the tires were cold, such as sitting