Based on propylene glycol and hence gives a very safe level of toxicity when compared to ethylene glycol based anti-freezes. The ready to use formulation includes 50% distilled water to give zero lime scale deposits, optimum frost protection in severe winter conditions, plus excellent anti-corrosion performance. Anti-cavitation performance exceeds that of conventional ethylene glycol based antifreezes, providing the user with superior protection against engine and coolant pump damage.