Transmission fluid on 2003 Toyota Highlander

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?

by in Vienna, VA on October 13, 2009
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1 answer
ANSWER by , October 15, 2009
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.