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On attached soundtracks you can hear delicate whirling sound multiply times when accelerating so I hope it's nothing related to turbo but as you said when on neutral is quiet so it shouldn't be turbo.

Right, sorry for misunderstanding;) It's only happen when accelerating on lower or higher speed. If revving on neutral is quiet. The current approx mileage now is more than 48,500 miles. Yeah, gearbox oil has been changed a few months ago in Audi Service.

Hello, Mechanics struggling to diagnose what is this. It's happens no matter I drive on my own or under load with passengers or baggage.

Hello everyone, I own Audi A6 (C7) 2.0 TDI Ultra S-Tronic from 2016. I hear whistling/whirling sound when accelerating slowly or harder from 60 mph/70 mph at 4th, 5th, 6th or 7th gear even if I drive slower and want to accelerate this sound is hearable from front of the car. The sound comes from...

Welcome, I wanted to say hello to everyone here Happy new year!!