I was told by one of the express oil companies that after 200,000 there was no need to change the transmission fluid....this has been a great vehicle and I hope to keep it much longer but I am feeling almost a drag in the rear end when I accelerate after a full stop
Should I change the transmission fluid on my '99 Lexus LX470 with 276,000 miles on 1999 Lexus LX470
Transmission fluid contains detergents to help keep all solenoids and orifices clean. After 50k the detergents have depleted and a transmission service is recommended. At 200k if you change the fluid there is a very good chance that the detergents will loosen up some varnish or debris and cause a problem. I would not change the fluid at this point.