Break-in fluids

The current generation of diesel oils would be OK for a cat equiped car but not what I'd want for break-in and first few thousand miles on an engine with high spring pressures.
2018 Rotella T4 15W-40 PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM

2017 Rotella T4 10W-30 Rotella t4 10w30

Zddp now seems to be just under 1000 ppm for most.

This is the only off the shelf conventional oil I could find that had over 1000 ppm zppd for post-break-in use on a stock flat tappet engine (cat equiped).
2017 Ford Motorcraft Superduty Diesel 10W-30 PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM

On a performance engine I would consider that the minimum. For the break-in iteself I would use a break-in oil. We used Brad-Penn even on my stock AMC Jeep 360, but I don't think it matters which brand as long as its made for the job.