Pencool 2000 is a patented liquid formula to keep diesel engines running cleaner. This easy-to-use product reduces scaling and corrosion and acts as a lubricant in the cooling system. Pencool 2000 controls formation of harmful scale deposits, reduces metal corrosion and cavitation erosion, and lubricates the water pump and other metal surfaces. Pencool 2000 eliminates messy filters, saving you maintenance time costs.