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Q: Transmission fluid on 2003 Toyota Highlander

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Toyota says on the transmission fluid dipstick that the fluid should not be changed. Is that true? Or should I go by the mileage and/or the color of the fluid?
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Many manufacturers say that transmission fluid never needs to be changed, or only needs to be changed at extremely high mileage. It's cheap insurance to shorten that interval. I recommend working with your service center with the scheduled maintenance in your owner's manual as a baseline. The right interval at which to change the fluid is a function of your car, your driving habits, and even where you live.

Mileage is the right guideline, however. The color of the fluid is rarely a good guideline for transmission fluid changes.
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