Who said that? I specifically said NOT to use an additive. If the oil isn’t good enough get a better oil rather than adding some garbage to the oil to try and fix a garbage oil.
Certainly if you think you can only find .0002 hp from oil you’ve never tested any of it. And there is more to oil than hp.
I’ve changed oils on the dyno and the difference in blow by numbers was staggering. And that was two oils I wouldn’t have used. The lesser, big name oil is a favorite around here.
There is a big difference in oils. To think otherwise is foolish.