E90/E91/E92/E93 (2006 - 2013)
Title says it all.
I made a quick video showing the noise and some engine values, will try to link it in the comments. Tests were performed at 90 degrees celsius (engine operating temp.)
Background info-
M57TU2D30 engine.
Car rolled out of the factory on 11/2005.
Engine has been making this...