mike, do you really think so? i mean the engine only overflows when it reaches a pressure (temp related) where the cap lets it out. now, let's change the cap so that it blow at only 10 degrees over optimum temp. if the engine don't puke, why do you need different coolant? water boils at 212, but with some pressure can push that up to 220-230 before it blows. so if your engine (in any motor) don't puke coolant, is it NOT already at optimum temp and not over it? meaning, if you are not puking coolant, what more do you need?