Attention! If oil gets into the cooling system circuit, it is necessary to flush the radiator and radiator expansion tank with special cleaning agents.
Flushing the radiator of the cooling system must be carried out in the following order. Remove the radiator of the cooling system and the expansion tank of the cooling system, if it is mounted separately. Prepare about 2 liters of cleaning solution. Fill the radiator and the expansion tank of the radiator and shake well for several minutes until all traces of oil are dissolved. Drain the solution. Thoroughly flush the entire cooling system (set the heater regulator to the "Heat" mode) with hot water, changing the water several times.
Check the drained liquid (water) for traces of oil. If necessary, repeat the process until all traces of oil have disappeared. After cleaning, fill in the coolant, having first checked its density.
[The original article is posted on the resource «BMWMAN.ru»]
