I have a 2004 whining CL600. I cant take it anymore. I keep turning the radio louder and louder but I still hear it. Do any of you know what it can be? Everything seems to working well - I just came back from a ride to Boston, Niagara, Cooperstown this past summer from Chicago. When I start it up and drive to about 30 mph or any speed for that matter and then let up on the gas I hear this whine. At a constant 30-40 you can really hear it. I hear it all the time. It just moans like and old wh***!

 

Hi,
Have a google for pulsation damper, My C216 was whining with revs and this was the problem, Very common on ABC cars.
Thanks