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It's basically for the cams since they are all flat tappet. Now if they had rollers that would be a totally different story. All modern engine oils work great for them.

The problem with "STP" and other additives like it is they make the oil to thick to flow properly. You wouldn't use gear oil in your high revving engine would you ? The same applies here. It can gum up things like your oil filter and oil pump pick-up screen. I've actually seen that. The screen...

Your "Detroits" have roller cams so no need for any ZDDP type of additive. I too only use Synthetic oils. In my engines, transmissions, differentials and transfer-cases. I have for decades now. My vehicles bodies wear out before thier drivetrains fail.

I have no problem using STP for assembly work. It sticks well and during "first start-up" prevents wear and galling. I was referring to constant use as in every oil change.

Yeah I never touch the stuff since I learned about it in Tech School. None of the instructors had anything good to say about it ! Over all these years I have personally seen the damage it can do to an engine. Just stay with a good engine oil like "Rotella" or "Dello" . The only additive I use...