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 overnight the tires developed slight flat spots that go away after a few miles of driving. That seemed to be the case and I was satisfied with the explanation.
When I reached about 7500 miles I still was feeling a slight vibration but became noticeable at 38 to 43 MPH, and much after 45 MPH not noticeable at all. You could feel it in the steering wheel and if you put your palm on the center console or on the passenger headrest. I drove my LS on a lot of different road surfaces and was fairly confident it was not my imagination.
I made an appointment and took my LS to the dealer with 7700 miles on early Jan.'12. After inspection they decided there was a, "Belt Shift", in the left rear tire and replaced it. It was difficult for the dealer to test drive the LS for any length of time at the speeds of 38-43 45 MPH because of traffic. I took the car home and thought I still was feeling a slight shutter and vibration. I made another appointment and returned to the dealer 5 days later with 7800 miles on my LS. The dealer had me ride with the mechanic and I could feel a bit of a shutter vibration with the mechanic driving but was difficult to keep driving at a consistent speed. They replaced the right rear tire because of a, "Belt Shift", as a, "GOODWILL WARRANTY".
I took my LS home and in the last week have put about 150 miles on it. Although the vibration and or shutter I am feeling seems to have definitely lessened I am not convinced that it is gone completely.
Well, that's my story and I would appreciate any comments or suggestions.