As an additive, Flamingo Concentrated Coolant is highly efficient in improving the heat conduction function of cooling liquid in the cooling system and preventing engines from overheating. Compatible with all anti-freezers and cooling water. Changing the cooling water in radiator yearly can provide the best protection to radiator and parts.  USAGE DIRECTION: 1.Drain out existing coolant and rinse out the inside of radiator. 2.Pour in the specified amount of this coolant, then add water until the liquid level becomes visible and run the engine at idling speed for about 5 minutes. If the liquid level falls, add water so as to bring the level to about 3cm (about 1.2 inches) below the overflow pipe. Be sure to observe the specified level since the coolant expands as the temperature rises