BASF Glysantin? G40? Coolant Concentrate is a glycol-based coolant that must be diluted with water before use, at a concentration of 33-60% by volume. A 50/50 mixing ratio is generally recommended. It is advised to use distilled or deionized water for dilution. In most cases, tap water can also be used directly. Due to the unique properties of Glysantin? G40? Coolant, which are only achieved when used alone, it is not recommended to mix Glysantin? G40? Coolant with other coolants from the Glysantin? series or with coolants from other brands.