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I had similar situation, from 140 to 160 kmh! Any revs,any gear, same sound... mechanics said differential, or xdrive unit, or chain.....problem was in empty a/c system! After 20 dayswith that sound and expensive diagnosis "this or that", a/c stopped cooling. I got to refill a/c gas, go along my way and noise was gone! Try with that first! Cheapest fix!
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