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
Your transmission can become damaged over time, and your transmission fluid can contain contaminating particles that help with grip, relatedly–changing the transmission fluid will get rid of these particles, and you can start experiencing slippage where previously this wasn’t present with the old fluid.
It is however, a case where the problem was already there in either case. Not changing your transmission fluid can lower the life expectancy of your transmission, but this old fluid will help “solve” the problem somewhat in the meantime, and the new fluid will make the damage more apparent.
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