The Brad Penn oils I've seen VOA's/UOA's on weren't spectacular for stressed diesel applications, but for break in they should work fine. Be gentle on it then go for something a bit more stout. Have fun creating roadworks projects to stimulate job creation when you put your right foot down and rip up the black top!
I'm being repetitive.I would use the best oil Cummins recommends, which for your app is probably a good CI-4+. Like Delo 400 15W-40. Not the new LE variety.
Unimog U500/Unicat camper, using Delvac 1 SHC 5W-40