RE: oil change interval 50,000 100,000 COME ON............
Look it up in the owners engine manual or call Cummins. The reccommended oil change interval for the ISC is 15,000 miles according to Cummins Literature that I have. Why waste money at the price of oil changes. Its unnecessary. Oil Analysis can save you a bundle. But again, the reccommendation by Cummins is 15,000 miles without any extra considerations. Why no one answers the question is beyond me. I am looking into synthetics, Spinner II and Harvard filters also but you don't need any of this to go 15,000 miles. LOL Ed