Understood, and I realize this is a fact.
Just saying I have personally never had cam/lifter or any other lubrication failure using either of the two mentioned oils with flat tappet valve trains.
I do think it’s possible zinc additives may be more important with todays lack of metal and machining quality.
Not sure how to address this.
Maybe your motor doesn’t produce enough power to overpower the oil pump?
Gotcha :D
Seriously though, I have never experienced anything like that.
Of course every single time oil comes up there is always other opinions.
The OP is in Florida where it can get pretty warm, and 440’s are not generally regarded as high winding motors with tight tolerances.
Those two facts are what guided my suggestion.
Sure, if it was a motor originally designed to run synthetic my recommendation would have been different.
