ODD Cummins oil pressure

[Diesel_Pusher]

Was recently reading a Blog by SAE engineer 540RAT : Tech Facts No Myths...Motor Oil Engineering Test Data.
I spent about three hour on his site. Much, if not most, information
was about cars (small gas engines), but could be generally applied to large trucks.

The bit about oil additives was a eye opener

One was high levels of ZINC are not helpful and actually cause cam damage.

I wont be buying Royal Purple at a premium ever again.
A couple of the AmsOil products tested incredibly high in all categories.

Oil PSI is the resistance to flow, (New bearings). Lower PSI ( Thinner oil) with higher flow resulted in lower oil temps and less oil breakdown.