why should you not change your transmission fluid if you’ve never changed it last 10,000 miles.

Question

For context: I have an older Toyota 05. 160k miles. Transmission fluid looks kinda brown and mechanic said I should do a flush and quoted me 300$. I’ve also heard that at some point you shouldn’t change the transmission fluid if it has t been changed in awhile. Why is this?

In: Engineering

Answer 1

You must be missing a 0 because you never have to change your transmission fluid after only 10,000 miles.