Designed to remove mineral deposits, rust, and oil residue from the radiator and cooling system. It cleans the engine, heater core, and radiator, and removes blockages that can cause overheating. It also restores cooling efficiency, improves heater performance, and resets the thermostat and water pump. Effectively works with all types of coolants, including organic (OAT) coolant. Safe for all types of radiators and rubber hoses, and suitable for both gasoline and diesel engines. Directions for use: One bottle treats up to 12 liters of coolant. Pour the contents of the bottle directly into the old coolant. Run the engine at idle for 15 minutes, then drain or replace the coolant using a utility tool.