Ok, just to curb the matter I know where volk is coming from. ...and the virgin analysis shows compared to other conventional oils that it indeed has a very high calcium/boron add pack that makes it look more like an extended drain syn, just with lower quality basestock/lower starting TBN.
If you want maximum cleaning, you could then go to Kreen as far as additives...or a boutique oil. Any full syn oil would do a good job, but Ultra/Amsoil currently still have the 'proven will clean' add packs with high calcium/boron etc...even Red Line would probably help to clean over time, depends on 'what' needs to be cleaned, though.
I agree with PYB + MMO 20%, top off with more PYB if the car has consumption.