About to replace the transmission fluid on an automatic 2008 yaris with 172kms

[jessesYaris]

Never changed the transmission fluid before.

I know it sounds bad that I've yet to change the transmission fluid at 172kms...

But in my defence it's mostly highway/long distance travel and the transmission fluid is still bright pink. Doesn't smell burnt. Etc. Looks fresh.

Starting to wonder though... It can't last forever and the fluid is only $9/liter from the dealership so I figured I should replace it.

Got to the dealership, asked for a price on transmission fluid filters and the lady says "there are no transmission fluid filters for the yaris, we just drain it and add new fluid here".... ???

So first question... is that true? Are there transmission fluid filters for the 2008 yaris or not? I don't see anything about transmission fluid filters in my manual... but they certainly sell them at other local shops like napa/partsource.

Second question... is this a good idea or not? Changing the transmission fluid for the first time in 172kms???

I've read everywhere that if I've left it this long, that it's probably best not to change it lest my transmission start slipping/I can ruin it by changing the fluid.

What do you suggest?