Oil pressure question...I promise it's not another "who likes what' thread!

Okay, aside from the 'funtime with screen names show' does anyone believe it's better to wait until more miles are on before going synthetic? I remember an old builder telling me 'not before 5000 miles' but that's been years..
And thanks fish but the relief spring only controls the ceiling, my issue is with the floor so-to-speak. I'm not getting into bypass with the 10-40, the 15-50 was actually bringing 5 more psi up top which, I don't think was opening the valve either. It *should* (there's that word again) be a 72-psi spring.