I changed over to vwb from pyb in my pesonal cars and the few gas engines in our fleet of buses{mostly have diesel} wich is 8 vehicles total now on VWB and most used very hard , so far I am very impressed with valvoline.
main reason for the change was availability from our vendors, we have done roughly 15 or so oil changes,usually at 5000 miles with the vwb and it seems to hold up way better, no proof just observation of oil condition when drained. opinion only