I bought a used 06 300 AWD August of 08. Also got the rattling problem noticed as weather here got colder. Lexus did authorize repair even though had over 50K on the odometer. The problem is definitely better but the rattle is still there. It seems to be coming more from aorund windshield area. Should I return to dealer and have them try to fix or just live with this. I had a 02 GS that did not have a single rattle. I am very disappointed by this , this is only complaint otherwise great car.