Need recommendation of oil for startup

My engine builder uses a break in specifiv oil. He says "don't try to be a chemist". In regards to mixing up oil concoctions. He also claims that many of the additives actually decrease the lubrication properties of the oil.

He uses and stocks joe gibbs oil.

As far as using junk for the break in. The logic there is simple. Don't pupt an oil in that engine for the more crucial time that you woudn't normally be willing put in it. Like cooking with wine, you shoud never cook with a wine you wouldn't drink... It's hard to see the logic in building an expensive engine and try to save 40 or 50$ on the break in oil.