Cat® ELC incorporates an advanced technology with organic acid corrosion inhibitors for maximum copper, solder, brass, steel, cast iron, and aluminum. protection. Lowers maintenance costs by eliminating the need for supplemental coolant additives, extends coolant change-out intervals, and reduces disposal requirements. Cat ELC is recommended in most Cat machine engine and machines. Do Not Add Water to dilute. The 619-8712 ensures optimal performance and durability. Designed for efficiency and longevity. A must-have for Caterpillar equipment maintenance and repair. This 619-8712 Cooling System Cleaner Caterpillar (3.7L) Replace 4C-4611 by Caterpillar is built to last.