Originally Posted by AircraftX

I understand there is no interval to replace the transmission fluid. But what I'm saying is that we all know this is probably not true. There is no such thing as "lifetime fluid." In another internal Toyota/Lexus document, it says the transmission fluid is rated for 100k miles. Well, that is not lifetime at all since our cars will last well beyond 100k miles. There are many contradictory statements here concerning the transmission fluid. I want my car to last beyond 200k miles and trying to see who else is like me and need to do proper maintenance on the fluid.