How frequently does the automatic transmission fluid need to be changed?

[Tedtalker]

Originally Posted by CTScott

The total capacity if the U340 AT is 5.68 quarts, but when you pull the drain plug only a bit over 2 quarts will drain. Pulling the AT cooling hoses and draining them and the AT cooler portion of the radiator drains about another quart. The remainder stays in the valve body and the torque converter.

I just performed a drain and fill with the Yaris jacked up on the drivers side only. a little over 3 quarts came out of the drain hole. Noticed when I let the jack down it quit draining. I jacked it right back up on drivers side and fluid started draining again. That's a tip from me to others here who will drain and fill. Over 3 quarts came out of mine. Yes indeedy!