Cat Extended Life Coolant is recommended in most Cat engines. Do Not Add Water to dilute. • Factory - Fill - Used as standard factory - fill for all Cat engines cooling systems. • Lower Maintenance Costs - Reduces engine coolant and additive costs by as much as 500% compared to conventional coolants. CAT ELC eliminates the need for supplemental coolant additives, extends coolant change - out intervals and reduces disposal requirements. • Advanced Metal Protection - Incorporates an advanced formula technology with organic acid additive corrosion inhibitors, such as a combination of mono and dicarboxylates for maximum protection