many new toyotas have a locked tranny that you cannot change the fluid in.............but toyota can
my 05 DC Tundra is one of the lucky ones. they said that it would need changing at 100,000 miles.
You can change the fluid, you just don't know how.
I don't know how to fly a helicopter, but I wouldn't tell people that they can't be flown just because I don't know how.
most mechanics i talk to say flushing your tranny is a bad idea & can cause damage. on top of that i dont know any car makers that actually recommend it. If you change your trans fluid regularly i don't think its neccesary.
It's IMPOSSIBLE to damage a transmission by simply flushing it. The machine doesn't produce NEAR the pressure that the transmission itself produces. Most "mechanics" probably do believe that. However, I prefer the advice of a professional "technician" instead. Car makers don't recommend cleaning the throttle body, fuel injectors, alignments, etc. That doesn't mean that they shouldn't be done.
Flushing the fluid or simply doing a regular service (drain and fill), depends on the condition of the fluid. If it's in very poor condition, flushing is recommended the help exchange nearly all of the fluid.