I use 50/50 glycol coolant. Your thermostat regulates the temperature so unless you're overloading the system then nothing is going to work any better than anything else. If you want to change it every year go for water wetter and such, otherwise just put regular coolant in it and change it every 2 years like you're supposed to. If its a track bike then you have other options since you can't use glycol based coolant.