Example: As a result of the hydrometer measurement, it was found that frost protection is provided down to -10°C. In this case, it is necessary to drain 3 liters of coolant and add 3 liters of pure concentrate. Table 1 applies to a cooling system capacity of 10.5 liters (520i, 525i without catalytic converter). On other models the values are determined accordingly.
Caution: Top up only with BMW recommended nitrite-free antifreeze.
Close the radiator cap and after a test drive recheck the frost resistance of the fluid.
(Examine the original source using the link on the website: BMWman.ru)