What is the reason why the water pump of BMW 7 is broken?

Coolant leakage and aging of water pump sealing ring; Need to add coolant and replace the sealing ring;

Tight coupling of engine will also lead to premature wear of water pump;

The antifreeze is not replaced for a long time, and the internal corrosion leads to the damage of the water pump;

The water pump has reached its service life and has not been replaced for a long time.