Cummins ISX engine oil?

[Chamberpains]

Pop the cover, inspect and run the overhead. If everything checks out then go ahead and switch oil. There will be a "possible" oil break in time. Where you may burn or consume a little oil as the engine adjusts to the new composition of oil. But nothing to worry about. Just don't constantly switch. Pick one and stick with it. Rotella t4 is what most of us use. It's great and recommended oil for the ISX.