I think the trouble is knowing whether you have a problem or not.
The most obvious example right here is that at 21k miles on a 2022 that gets regular oil changes with good oil, definitely no problem to solve. Pick a decent oil for the application and continue on for years.
Sometimes you might have a sludge issue that you're not aware of though....My truck is a 2005 Silverado with 254k miles on an engine that is not known to have many issues.
As long as I've been working for the company of got oil changes every 3-5k miles but I don't know what it got before my boss but it at around 100k, however it runs great.
If I was to ask on here, what oil I should use....the most typical response is "just stick with whatever it's been using, obviously it works". Well in my case, the previous maintenance wasn't working, at least before I got the truck. I only had minor reason to suspect a problem.....a puff of blue smoke on startup occasionally. It used a qt of oil in 3k miles. Oil stayed clean looking on the dipstick right up to oil change time. Seems like bad valve seals right? Well there is a known issue with the valve cover/PCV....so let's order a new valve cover and swap it out......holy carp....sludge city (by my standards).
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photos.app.goo.glhttps://photos.app.goo.gl/8Hk8c1DNVo7m1ch88New item by Mike Kennedy
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photos.app.goo.glAfter I replaced that valve cover and scraped as much of the sludge out that I could, oil usage dropped to nothing between oil changes, at least not enough to need topped up. That wasNew item by Mike Kennedy
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Good example. But again, you don’t particularly know the previous history. So you don’t know how it was treated, mechanical issues before hand, etc.
So hypothetically speaking, let me ask some questions;
Would Valvoline RP fix those issue's you have? For sure? If so, how and why? If not, why?
Would Mobil 1 Dexos approved product, fix those issue? If so, how and why? If not, why?
Would any boutique brand (amsoil, HPL, redline, etc) fix those issues? If so, how and why? If not why not?
Again, I’m not saying this is bad oil. Use it if you want to. All I’m saying is don’t buy into marketing. To me, things like your example, show negligence to preventative maintenance. And I see engines apart all the time. I also sell literally tens of millions of gallons of all sorts of oil. Your example screams to me someone didn’t do basic preventative maintenance before you got it. Or there was a mechanical issue that end unaddressed. In which cases nothing the oil can do.