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15w40 or 15w50 convential diesel oil crankcase. any 80w or 90w gear oil axles. Trans- engine oil or tractor axle oil if now clear. Dex trans oil if you have pink now. In grneral I give motor a splash of Lucas unless sub zero temps.
I run marathon Elite 15W40 conventional oil in the truck. I get it from my fuel supplier. Great stuff and it is only about $50 for 5 gallons. I change the oil every 10,000 miles as per the Cummins manual.
I spoke extensively with my fuel supplier and they have spoken to the actual chemist of Shell. The Marathon is basically a clone of the Rotella. There is absolutely no wear benefit from running conventional oil vs synthetic. The rear benefit is extended oil drain intervals. I change oil once a year. I only put about 7-10K on the truck a year so I just change it. Hope this helps.