Type T-IV is the ATF required for the Aveo's unless your owners manual says otherwise. If I remember correctly it was something like a little over 2 quarts when i replaced the fluid from the pan. Get yourself 3 (1 Litre) bottles which is more than enough to do a single drain & fill and then you can get the rest of what you need on the next fill. I was surprised to find out that the Toyota dealership sells T-IV for the same cost as the Mobil 3309 so I will go that route next time.

BTW yes the tranny dipstick is the way to fill the fluid. You can refer to this link http://www.justanswer.com/chevy/6ofo...-6l-going.html for an Aveo automatic transmission fluid and filter replacement.