My ML makes kind of a whining, high pitched noise when the vehicle is idling. I don't really know how to explain it. I'll try posting a video if I can. It's almost like a chirping, whistling kind of noise... I know for sure it's coming from the engine bay.

If anyone has any idea of what I'm talking about, is this something major that I need to take in to the dealer, or a simple DIY fix?

Thanks.

Have no idea but you should have it checked at your MB dealership asap

is it only when cold oil slapping thin oil pan pulled belt stillnoisey (cold) factory rep said normal (ofcourse

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