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
I’ve never heard any convincing evidence that this is the case at all. The common explanation of “oh the old metal particles in it are holding it together” or whatever is just totally made up and doesn’t make any sense at all.
It’s the *flush* that causes the problem. The flush can force bits of debris into places they normally don’t go. *That’s* what ultimately causes the problems you see and where the advice to not change really old fluid comes from.
The proper thing to do is not to flush it in the first place. I don’t think most manufacturers recommend flushes at all anyway. Follow the actual recommended service of draining and then filling the fluid along with a filter change.
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