Evans is very popular around here for use in 4 stroke dirt bikes that are prone to overheating and steaming in the woods (Husaberg and some KTMs as examples). It does nothing to make your bike run cooler, but instead keeps it from boiling over and loosing coolant when it gets too hot. The "never change" thing is good, but other than that, I don't see the need for it in a street bike application.