What type of antifreeze does my 2006 Chevy Aveo use?

Your 2006 Chevrolet Aveo uses either orange or yellow antifreeze, also known as "Dexcool". The important attribute here is that it's using the OAT technology. Personally, I just buy a gallon of Prestone 1 Gallon Yellow Concentrated Coolant / Antifreeze, part #AF2000, from O'Reilly's for $16. It's completely compatible and OEM sanctioned. Typically, Your antifreeze should last for 10 years or 300k miles, but in the real world, it never seems to. If You find that You're frequently having to top off the coolant reservoir, that's likely going to indicate You've got head gaskets that may be starting to fail; that's an expensive repair, so keep Your eyes on it.