Liqui Moly Cooling System Radiator antifreeze 620016 - Liqui Moly 21131, Liqui Moly KFS 33 21131 radiator antifreeze is designed to ensure optimal engine cooling performance. This 5-litre solution provides excellent protection against frost, rust and overheating. It is typically used in automotive radiators to maintain efficient engine operation. Liqui Moly 21131 KFS 33 Antifreeze 5L Protects from Frost & Corrosion