Another update.
As always I thought I would go back to basics, start with what I know so I checked the oil level. Alarmingly it was so low it wasn't even touching the dipstick! (Problem 1).
It took 1.6 litres. Since then and a bit of driving the buzzing has largely stopped. I wonder if the noise is/was the oil separator struggling to operate? I believe it is at the back N/S of the engine? (Problem 2).
I also established that the very bottom of the wheel arch liner has not been reattached after recent suspension work and was rubbing on the wheel, that was creating some noise and feel through the steering wheel as well. (Problem 3).
I'll keep going!
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'09 D3 S8 - Most of the bells and whistles (B&O, Audi Exclusive brown interior and exterior paint, soft close, ACC etc) de-flapped manifold!
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