My 2011 A5 2.7tdi multitronic has had a whine for around 6 months, possibly gearbox but looking for advice please; the noise seems to be road speed dependent and not engine speed.
I've uploaded a video showing the noise
This is at ow speed and I even put the car into N and rev to show it isn't engine speed; I can upload a video at higher speed if needed.
VID_20241230_233756904.mp4