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Update
Beside the boost hose that I replaced, I had the dealer replace the crankshaft pulley and both belts but the noise remains. Dealer then took off the pulley and the noise goes away but is back with the pulley on.
They also inspected the oil filter but did not find any metal debris but said when they listen with a scope, they hear the noise from the crankcase.
Now they will ask the area BMW technical rep for insight because they can't figure it after 2 weeks.
Car only has 61k miles and hasn't had any oil pressure issues so I can't imagine it's related to a crank/rod/bearing etc.
Any insight would be greatly appreciated.
Thanks
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