Similar story here also with my 97 ES300. It has 260K on it without engine nor tranny work. I have replaced couple of O2 sensors, EGR valve with regular oil change and TB once and the shock mounts. Another TB is due soon though. With my 2003 RX300, I replaced the TB at 150K and I found the belt to be still in prestine condition. Like everyone else, I hope my current 2005 LS430 to last long, long time..