I used this product in an old oil-burning Oliver diesel tractor, and it seems to help that quite a bit. It is obnoxiously thick--so thick even at room temp that when you pour it, it will "stack up" on itself when it lands on something rather than dispersing.
I remember seeing a VOA on this add that shows very low levels of moly, zinc, etc. with a dab of antimony. Apparently people have had very good luck with UOAs with it in their oil, almost like there is a synergistic effect of some kind.
Personally, I think it is too thick, particularly in winter, and is best suited for worn out, oil burning type of motors. Schaeffer's oil doesn't need any additives IMO.