What water / antifreeze concentration is recommended when using Purple Ice?
Purple Ice may be added to any antifreeze / water mix; however, testing has shown higher water concentrations yield greater cooling benefits. While Purple Ice does contain corrosion inhibitors as well as lubricants to compensate for a lower antifreeze / water concentration, Royal Purple recommends a minimum of 20 percent antifreeze concentration be used in street driven vehicles because Purple Ice has no effect on the boiling and / or freezing point of water.
