With nothing but the anecdotal to offer: I had a VVC160 that was well used (45,000 miles) before me that I then ran on comma fully synthetic 5W50 for a few years and close on 10,000 miles. By that time there was too much play for DVA to be comfortable with it and it sounded like a mouse was in there with a .50 calibre machine gun under load. No idea what oil it ran on before my tenure. Whether it was miles or oils that did for the wear but wear it did. Now DVA VVC free.