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Question Which oil for Cummins ISL 9 and ONAN 8K?

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I just serviced mine and used Delo SDE 15w-40 which is a CK-4 oil and I think is semi synthetic, but I used it because it was on the shelf. Had Rotella too so it was a toss up, The unit just calls for 15w-40 and since it doesnt have a DOC/DPF I dont think it matters beyond that. No need for ultra low sulfur or post 2017 greenie happiness (ISO Clean, GHG17...:rolleyes:) or whatever.
 

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