Having just rebuilt the motor from scratch....new everything, except block and heads. I switched over to the Evens Product....I am not going to start the rust and corrosion process all over again. It does run a little cooler, but what I noticed is that since it does not boil it does not have the pressure when the car gets hot, I am sure this will save on hoses and seals. You can take off the cap while running and it does not over heat. One thing to remember is that you have to get almost all of the water out of the system before switching. I do not have to change the coolant every 2 to 3 years to keep the rust and corrosion away.