Example: As a result of measurement with a hydrometer, it was obtained that frost protection is provided up to -10°C. In this case, it is necessary to drain 3 liters of coolant and add 3 liters of pure concentrate. Table 1 refers to 10.5 l cooling system capacity (520i, 525i without catalyst). On other models, the values are defined accordingly.
Attention: Only top up with nitrite-free antifreeze recommended by BMW.
Close the radiator cap and after a test drive, check the frost resistance of the fluid again.