SCREW 0952175 - Caterpillar

Water used in the cooling system should be clean, and as free as possible from scale forming minerals or corrosive chemicals. Softened water should not be used. Fill to the proper level with permanent-type anti-freeze and water.Before placing the engine in operation, make sure a 3% concentration of Caterpillar Corrosion Inhibitor or equivalent has been added to the cooling system. This 3% concentration must be maintained in cooling systems which are filled with water and systems protected with ethylene glycol antifreeze mixture, regardless of antifreeze concentration.Every 3 months, 500 service hours or 25,000 miles (40,000 km) whichever occurs first, add corrosion inhibitor to maintain the recommended 3% concentration.Refer to the application chart on the container for initial fill and maintenance fill amounts.