The Penray 16 Oz-Pencool 3000 with Stabil-Aid Treatment Coolant Additive is high-quality coolant additive features Stabil-aid, which prevents the formation of gel deposits that can clog up radiator passages and oil coolers. It also helps maintain proper cooling system heat transfer characteristics, resulting in longer engine life. In addition, this coolant additive reduces corrosion, cavitation erosion, and liner pitting, while lubricating water pump and other metal surfaces to reduce wear. FleetPride is your First Click in Heavy Duty®.