Nalcool (also known as Nalco) created a “biscuit”-like additive that put supplemental coolant additive into coolant to prevent cylinder liner cavitations. In an era when diesels produced much less power and many had dry cylinder liners, cylinder liner cavitations had not been a problem. But as power and torque increased, the higher cylinder pressures began to create pitting on the outsides of the cylinder liners. This company’s additive system, delivered by a pellet-like device, coated the cooling system metals with a protective chemical that eliminated liner pitting and paved the way for better Supplemental Coolant Additive systems in later years.