I have 1998 328is 92k miles. automatic
at about 40 mph and up i start hearing a humming , droning sound seems to come from the rear of the car.
its not a grindng sound. Car doesnt shake.
if i shift gears in the tramsmission the sound doesnt change.
i dont think its transmission.
definitely not engine.
Is it the muffler ?
the muffler valve does open at 2500 rpm when parked and i rev the engine.
otherwise its closed.
it does sound a little gurgly when in park.not much.
old muffler is stock ,
thanks
not sure but sounds like maybe a bad wheel bearing or bushings?
Wheel bearings
+1 on the wheel bearings. There are other things that can make noise under the same conditions, but wheel bearings are by far #1 on the list.
makes more sense .Ill place a new post on this
thanks
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