Cat® ELI™ (Extended Life Inhibitor) is a long-lasting coolant for marine and industrial engines working in environments that do not experience freezing temperatures. Cat ELI uses an active protection technology, similar to Cat ELC™, that avoids the problems experienced with conventional coolants and supplemental coolant additives (SCA) mixed with water. These types of coolants lay down a coat of inhibitors, such as silicates, throughout the entire cooling system that slows heat transfer and reduces cooling system efficiency. Cat ELI works by sending its organic additives only to areas susceptible to corrosion. This active protection technology delivers superior protection, improved cooling system efficiency, and is environmentally friendly. Dilute with acceptable Water.