I've not used Evans but have friends with high performance cars that had cooling problems (even with larger radiator and fans, and other upgrades, was marginal) that were basically solved with Evans. I believe the main reason for the poor warranty is that many people use it in those situations, and the coolant may not be the issue. That and it's used a lot in high performance cars, like drag racers, and cars that have more engine than needed. The later usually just can't get a big enough radiator in to cool the 2500 hp engine adequately. I'm not a fan of super high hp "bragging right" engines. I don't mind "more than I need", but no one needs 1500+ hp in a street car! Drag racing a different story... or over the road tractor...