What water / anti-freeze concentration is recommended when using Purple Ice®?
Purple Ice® may be added to any anti-freeze / water concentration; 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 anti-freeze / water concentration, Royal Purple® recommends a minimum of 20 percent anti-freeze concentration be used in street driven vehicles because Purple Ice® has no effect on the boiling and / or freezing point of water.