The KIA longlife coolant is ethylene glycol 950ml/L with dentonium benzoate10mg/kg. That is off of the label of an original coolant bottle I have. It is recomended to use 50/50 with distilled water. I now use another brand { Australian made Nulon long life} but make sure any brand you use is ethylene glycol based in the same strength or better.
The owners manual specifies any ethylene glycol based product that says it is compatable with aluminum radiators or aluminum engine components. Usually mixed 50/50 with water.
All the major name brands work just fine. My new car is still getting dealer service during the warrenty period, but I use Walmart SuperTech (yes, it's green) brand in my older cars. It works as well as Prestone or Peak, but use whatever you feel comfortable with.