For a break-in run on a new flat tappet cam, a ZDDP additive is probably a good idea. After that, I believe it's in the "nice but not necessary" category. I wonder if the Brad Penn folks were just repackaging Kendall GT-1 racing oil- - - - - -back in the late 1960's it had a noticeably green color. Good stuff- - - -just very hard to find and expensive when it was available!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!