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I have a 250D AMG LINE. New knuckle on next moth and running on Michelin Cross Climate tyres.

I have a whining noise that comes in between 37 and 41mph. It's been in and they changed the front diff fluid to an updated spec, but the noise is still there. Anyone else had this?? Any thoughts?
 

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I have a 250D AMG LINE. New knuckle on next moth and running on Michelin Cross Climate tyres.

I have a whining noise that comes in between 37 and 41mph. It's been in and they changed the front diff fluid to an updated spec, but the noise is still there. Anyone else had this?? Any thoughts?
Did anyone respond to this? I had a whine at 70kph which was eventually diagnosed as the front differential. MB replaced the differential and 15,000km later, a whine at 40 - 44kph. Car at dealerships now being assessed.
 
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