well yes bmw does have problem with cooling system, but u cant say bmw head gaskets fail alot under normal circumstances. but yes if ur car overheats that is what causes it? correct
but normally if it didnt overheat we couldnt say it was a common or even uncommon problem.
cause i dont hear about it happening that much, unless it overheats
but if ur car blows a water pump........pull over asaP :_D