[jmatta]

If I've understood Jake Raby and Charles Navarro's comments correctly, the higher rpm translates to higher oil pressure which feeds the IMS bearings at a greater volume, reducing friction (I know, the bearing is supposed to be sealed, but likely leaks).

This is also why they recommend removing the outer seal to allow greater oil flow.

And for what it's worth, I only use Royal Purple in my Box S. Tried it in my '73 911, but leaked too much; so back to good 'ol 20W50 Castrol GTX Dino juice (though it's looks like Brad Penn going forward).