I am not convinced that ZDDP is unnecessary after break-in. I've seen a lot of cams go flat in the past two years on engines that have otherwise had no issues and have been properly maintained. I think it's likely even more important on engines that are run intermittently...weekend drivers, summer cruisers, where the oil drains down completely between uses...than daily drivers.

The current Rotella T diesel oil offers insufficient ZDDP for protection. They changed the formulation to meet federal regulations.

Use a high quality racing oil, or a high quality automotive oil with a high quality additive.

My builder uses Brad Penn 10W-30 racing oil. I'm switching all my 'birds over once my stock of old Rotella is gone. It has 1500 ppm ZDDP.