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My bad. Why would you want to burn motor oil? Just go for some TCW-3, it's made to burn and the BTU's are almost the same as ULSD. Maybe costs 8bucks at Chinwongmart.
Just keep the percentage at 5% & that way you if you have any warranty issues & they blame it on the motor oil you added you can state that is what cummins recommended.
I have a new 5 gallon bucket of 40W oil that i no longer need. I have been burning it in my truck for the last 6 months. I use about 1 quart to a tank full. Seems to be fine.