engine knock noise

[cavx5]

hi everyone..just venting but i really am starting to hate this SAV..brought to dealer they heard noise and tech told me that he has never heard this noise before but it is not a lifter or valve noise..i guess that is the only good news...they replaced the valvetronic box on one side and it still makes noise..basically he said along with the shop foreman that it cant be fixed it is inherent to the motor it is normal ..bull****...they also said they started a 740i which has same motor and it made the same noise...bull again...all i know is that it did not make noise until 3 weeks ago so for it being normal is bull again....this is the first and last bmw i will ever buy..if it was leased i would not care one bit but i bought this crap and have to keep it for another year so i can break even...they are nice cars but not worth the headache...