[elwesso]

I think a lot of people are making this more complicated than it needs to be. As others have alluded to, it's really just a Band-Aid fix either way.

From a design perspective, there are only 2 factors (everything else remaining constant) that affect bearing life.. That is the applied load, and the operating speed. Since we can't easily change the load applied to the bearing, we can change the max RPM the bearing sees.

From my very limited knowledge specific to the S54 engine, it seems that perhaps shifting at 7000-7500RPM has a much greater effect on bearing life than whatever oil you use. There's really not much difference in performance by shifting at the higher RPM, IMO.l