What is Cor-Guard?

Prestone with Cor-Guard inhibitors is one of the most pivotal innovations the antifreeze category has seen in nearly 20 years. Cor–Guard is a unique patented inhibitor that provides 5 times more rust and corrosion protection for the cooling system, starting from the very first water pump impellor rotation.Since the introduction of Organic Acid Technology (OAT) inhibitors in A/F coolant, which enabled extended life protection, there has been little or no development in cooling fluids.
The problem with OAT extended life A/F coolant, it was designed specifically for the new vehicle manufacturers that demanded a fluid that would survive a 3-5 year manufacturer’s warranty period.
While it provides this extended life protection, it does take up to 6000 – 10,000km to coat the cooling system components and start protecting against rust and corrosion. This is acceptable for brand new vehicles with new cooling systems, but not so good for the older vehicles and Japanese imports with aged or neglected cooling systems.
Prestone has developed Cor-Guard to provide immediate protection for all metals in the cooling system from rust and corrosion right from the very onset. In older and imported vehicles where corrosion protection is vitally important, Cor-Guard is actively coating and protecting the cooling system from the very first moment the fluid circulates.
Prestone spent seven years developing this Cor-Guard formula. Prestone tested all cooling system components – from metals to polymers to gaskets – and completed more than one million miles of fleet testing, including aggressively driven emergency vehicles, to ensure optimal protection.
New Cor-Guard technology now provides 10 years / 480,000 km protection for automotive and light commercial vehicles.
The patented Cor-Guard technology has now migrated to Prestone Command Heavy Duty A/F Coolant providing 1,000,000 miles (1.6 million km ) / 20,000 hours protection :
Refer HD Coolant for more information on HD Cor-Guard
Please Note: Pack images and performance claims are of previous formulation. Current formulation 480,000kms /300,000 miles or 10 years