Anti Freeze Coolant proposed by us is the best-in-grade cooling agent. Perfectly flush & clean cooling unit with water before filling it to the expansion bottle to a level between the full and low marks. Also, check the level of coolant in the expansion bottle periodically and then top-up with the coolant. The fluid should be changed every 22000KM. or 2.5 years for ensuring excellent performance of the vehicles and industrial equipment & machines. Further, Anti Freeze Coolant can be bought at market justified prices.