Mannol 9965 Radiator Flush Cleaner 325 ml is a professional cooling system treatment crafted to restore optimal radiator performance. This expert formula safely dissolves rust, lime scale, mineral buildup and grease from engine cooling jackets, heaters and pipelines while improving coolant flow and heat transfer by up to 70 percent . Compatible with all coolant types and neutral toward metals, plastics and rubber parts, it delivers full corrosion protection and safeguards water pump seals from abrasive damage. Ideal for preventive maintenance or during cooling system service, simply add to the expansion tank, run the engine until warm and let the formula work for 10 to 30 minutes. Then drain, flush with water and refill. Regular use promotes cooler engine operation, prevents overheating and extends component life, making it essential for reliable vehicle upkeep.