I can see royal purple being used in a racing engine torn down after every race, it does give HP, but at a very significant cost. It'* basically water lol...

But on ANY daily driver, don't you dare use it.

I run Mobil 1, it'* still cleaning out my engine pretty good, she gets black around 4-5k so i change it at 5k. I'm trying a napa gold filter now, have been running wix the last 2 oil changes. I also use a fram sure drain cause I don't like messes.