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The cooling system in passenger cars and other light duty vehicles is maintained by changing engine coolant periodically. On the other hand, in heavy duty vehicles, the coolant life is extended by using periodic additions of supplemental coolant additives (SCA's). Today, both light duty and heavy duty fleet-service managers are faced with ever-increasing environmental pressures concerning the handling and disposal of used engine coolant. Coolant recycling is one alternative which significantly reduces the amount of waste disposed, while at the same time conserves valuable natural resources.