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
It’s incorrect to say that you shouldn’t change it. The biggest concern is that changing it can stir up contaminants that then cause malfunctions as well as modify the fluid properties that can expose existing damage.
The correct thing to do is change it, but be prepared to conduct further repairs if you run into problems, including replacing it.
You can choose not to change it, which may prevent the sudden onset of related issues, but you *will* be condemning it to premature failure. Either way, be prepared to replace it. One option just has a chance of postponing the need to.
16,000 km is not an excessive interval for a modern transmission.
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