Obviously, this is not the first time you have listened to the engine running so you know it is not normal.

But, it is hard to hear from the video what you hear. Can you do another for longer period of time and moving around slowly even under the hood so we can get a better idea of what is going one?

Anything else going on? Idles fine, revs normally etc?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas