I have a big vibration prob but the mechanic can’t track it down. If it had been a new car he would have a garage change bits until it was sorted. As it’s not new, I have to wait for something to break. May be a drive shaft but that’s only a notion.
The f21 - they don't have the diff mount cracking problems do they? I know re-welding and strengthening of the diff mounting area was a thing.
Otherwise vibration at speed can easily be tyres or wheels related but also propshaft/tailshaft/driveshaft and associated parts related.
I have a big vibration prob but the mechanic can’t track it down. If it had been a new car he would have a garage change bits until it was sorted. As it’s not new, I have to wait for something to break. May be a drive shaft but that’s only a notion.