Harsh Engine noise coming inside the car- BMW 320 IX
I found the cause and the correction in the notes
cause: Drive belt tensioner and drive belt noise contaminated with oil due to oil filter housing gaskets leaking.
Correction: Replaced oil filter housing gaskets and replace drive belt and tensioner.
It was ok for a week and the noise is back again. Can you please suggest how I can deal this problem with dealer. The car is still under the warranty and it ran only 46K.