I have used Castrol 20w50 on my V11S since new (~27,000km ago) with regular changes every 5000km, and replacing the filter every other oil change (ie every 10,000km). I removed the oil pan last service and found some, but not what I thought was an unusual amount of residue.
I also use the same oil (only 10w40) in my ZR750 on which I have done over 90,000km (but changing the filter every 5000km also). Call me old fashioned but dino seems to work fine for me. Gio