So it's time for a coolant change on my 2005 Kia Optima and I'm thoroughly confused. There's too many options on the shelf so I decided to check my manual. I figured there'd be a spec listed and I could just look on the back of the bottle for one that met that spec. Well, no luck. All it says is to use a quality glycol coolant. So I start reading up on the various options..... IAT, OAT, H-OAT, POAT. And now I'm more confused than I've ever been about anything. I was looking at MaxLife, but then I'm reading it has phosphates and silicates. Then I'm reading that Asian cars don't like silicates. People seem to like G-05 but I don't know what the heck it is. Zerex Asian? AutoZone cheap stuff? Prestone Extended life???????? I think I'm overthinking it.