I've always had my transmission fluid in all of my vehicles changed every 55,000 miles, except for my 3/4 ton Ford Pickup which I used to use extensively for towing which I had changed every 45,000 miles. Most newer vehicles don't list the transmission fluid changed because according to the manufacturers it never needs changed. I disagree with that, because as the fluid heats up and cools down it looses its lubricating and protective properties. eventually it will cause the transmission to fail, which is what the manufacturers want so they can charge you a few thousand dollars for a new transmission, because by the time that transmission fails your warranty will be expired.
Toyota isn't as bad about that problem, its just vaguely mentioned because most people don't think about the transmission fluid needing changed. I know in my Toyota Tundra its recommended every 60,000 miles.
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