F1, D1, Drag. How often do they get their engine’s rebuilt? Pretty much every season. We’re talking about wear protection in the long term. OEM choice in japan? Those japanese don’t even keep their cars for more than 80k kms, big difference from us North American’s here. I want my car to last as LONG as possible.
Notice of power improvement in performance is usually bad after putting oil. That’s because oil is thinner which frees up power, but offers a lot less protection. Read all about it in the UOA link.