All modern coolants contain corrosion inhibitors designed to prevent engine damage. Traditional coolants use inorganic inhibitors that break down over time. This causes the coolant to become acidic. A solution to this problem is to use Organic Additive Technology (OAT) corrosion inhibitors, found in new Long Life coolant.
ProShield is HD Expert’s own proprietary OAT formulation.
OAT coolant uses organic, carbon-based corrosion inhibitors. This provides several benefits:
When OAT coolant was first introduced, it was often combined with an inorganic inhibitor called nitrite. This was done to protect heavy duty engines against a form of corrosion referred to as cavitation. There is now a standard in place – ASTM D7583. Any coolant that meets this standard is safe for use in heavy duty applications. This is an industry requirement that all quality coolants must meet.
When you fill your fleet with OAT coolant, you’ll usually find that it’s amber, orange or red in color. OAT coolant meets the basic requirements of Asian, European and many North American OEMs.