FRAM Group AS107P Super Flush 22 oz Radiator Cleaner A 2-in-1 formula designed for light flushing and heavy-duty cleaning for cooling systems to help prevent overheating, the #1 cause of engine failure This premium formulation is designed to remove heavy rust and scale deposits in neglected cooling systems These deposits can dramatically restrict coolant flow and reduce heat transfer, which may lead to possible overheating, breakdown, or costly repair