I have 2004 IS with 126k. My transmission oil needs to be changed but I dont know if I should flush or just change my fluid.

I know that just changing the fluid will only replace like 4 to 5 quarts of fluid. I want to do a flush so I can clean out all the fluid. The lexus dealership told me they recommended just a fluid change. My friend who is a mechanic said a transmission flush. I thought I ask club Lexus since yall may have more experience.

Flush or fluid change, and why?

 

i would just go with a change...i was once told that doing a full flush will cause seals to leak.

 

I just changed my fluid. I wanted to do the flush but I had many people tell me not to. Thanks

 

i have 120k in my IS and i have never flushed it. It drives super smooth.

 

when everyone is referring to a flush - do you mean flushing with a machine?

i followed this guide and installed a tranny cooler and inline mag filter at the same time.
http://my.is/forums/f221/diy-automat...-flush-406503/

end result was all positive (clean fluid in the system and smooth shifting) - but granted there was only 30k on the car after i bought it used.

I dont see the harm in getting clean fluid into the system without the use of a machine. Someone please correct me if i am mis-speaking.