The Wynn's SP45941 Cooling System Flush (Wynn's product code 45941) is a high-performance chemical solution designed to thoroughly clean and restore the efficiency of vehicle cooling systems. This advanced formula effectively removes harmful deposits such as rust, scale, and oily sludge that can impede heat transfer and lead to overheating. It is compatible with all types of cooling liquids, including OAT coolants, and is safe for use with rubber hoses, seals, and all metals found in the cooling system. The flush keeps dirt and particulate matter in suspension during the cleaning process, ensuring a complete removal when drained. Recommended for all water-cooled petrol and diesel engines, one 325 ml bottle treats cooling systems ranging from 5 to 12 litres, making it ideal for preventive maintenance or addressing existing contamination.