Lexus Troubleshooting Questions? Ask a Lexus Expert
Hello I will help,
It used to be that you didn't want to flush a high mileage transmission but that was when you only expected to get 100000 miles out of one. While Toyota does not require that it be flushed during its life , you are at the mileage that it would bebenificial to do a fluid exchange with fresh Toyota brand fluid. Do not allow anyone to use one size fits all fluid, you may pay a little extra for the service to use fluid from Toyota it is worth it.
Please let me know if you have further questions