Rawze's Daily blog...

[Rawze]

(05-11-2016 )kryten Wrote:  Seeing as it's so easy to raise the oil pressure in an ISX is there some logical reason Cummins set it so low? My Volvo D13 with 15/40 Rotella runs 60 - 65 psi at road speed.

Some background info has revealed that they lowered the pressure because the extra pressure was washing out rod and main bearings on older models. I would suspect that they possibly carried that through to the newer engines.

I had a million miles on mine, and everything looked like new except the valve stems and overhead cam bearings. This was with the default 34-40 psi,.. so I see no potential in the stock pressure being a problem at all. I increased it to 48-50-psi just out of sheer curiosity, so perhaps it will extend the life of the head? -- not sure it will help, only time will tell.