Zinc isn't just for cam and lifter wear. It's also for piston rings, exhaust valves, valve springs and anything else that rubs together (not fluid lubricated parts).
I've seen an oil change make 18-20 HP. That was from 10w40 VR-1 to Torco SR5-R 5w40. When you see those kind of power gains you see that just because the engine is living doesn't make it happy.
Cheap oil isn't cheap and good oil is worth every penny.
It's sad in 2024 this is even in question. Buying oil at the local parts house or buying the cheapest **** you can find on the web is bad policy.
