I have been asking around people in Auto Supplies shop, and all of them don't have a definite answer as to whether what will happen if I will just pour in an undilluted Coolant into the container. I am not talking about pre-dilluted solutions, I am talking about those concentrated coolant which are supposed to be dilluted with water. Will it be less efficient if it's just coolant without water? The reason I am asking about this is because, I remember a guy from GM service center once told us that Dex-Cool has to be poured into the car by itself. I don't remember if he was talking about those pre-dilluted ones or not. Anyway, I hope anyone can give me a clear idea on this. Thanks.
DexCool alone will be very inefficient. Water alone is better. But when you mix the two, you get the highest efficiency. The back of any coolant bottle will tell you that. Usually mix 50%-70% coolant. No more than that.
The Service Center guy was probably referring to mixing green and DexCool. That's a big no-no. It will turn to jello and kill your engine. And it doesn't even taste good.
