General Questions for Cummins X15

[Rawze]

(12-09-2024 )RByrd Wrote:  ...at 900 rpm the oil pressure dropped to 20 psi then when I low idled for a few minutes at 650 rpm, it dropped to 15 lbs of oil pressure. ...

If the oil temp was (hot from a long pull) above 225+ or so, then that idle pressures are somewhat ok .. but if the oil temp is 218~ish, and its that low, then that is on the low side of things .. maybe something has too much clearance inside the engine.

One thing that will help is to add one gallon of decent modern brand of gear-lube (10-20% mix) at each oil change to help keep viscosity up.