There are two major classes of coolant that I am aware of. OAT (Organic Acid Technology) and HOAT (Hybrid Organic Acid Technology). I believe, dont quote me, DexCool is a HOAT, and I have often wondered if it was possibly the formulation that makes it a HOAT that is the issue. As far as I know the green ethelyne glycol is a OAT coolant.
That said, I do not know what the yellow (Ford) and Red (Toyota and others) coolants are. They may well be HOAT's but Im pretty sure they are formulated differently and what level of silicates they have I dont know either. I also have not had much chance to look into the G-05 coolants either.
