OH! I can answer!
In general, these types of additives do provide some level of benefit.
Here’s the thing. The base oil itself becomes the issue. All the whizbang additive may provide 1 zillion miles of service, but the oil itself is good for 5-7K tops before serious degredation begins.
Are they worth it?
You are further ahead with a high quality and expensive Synthetic of proper weight. Additives can indeed provide benefit, but the cost to benefit ratio isn’t that great.
I have pulled apart engines that went 200K on Penzoil and scraped the sludge away and I have pulled apart some with 5000 that ate bearings. Just use great oil, great filter, change regularly to avoid either scenario and you are good to go.
That's also been my experience.
35 years ago when I was a messenger driver, I used to put 300 miles a day on my work vehicle. I religiously changed the oil once a week for 18 months on that car, using only Pennzoil.
When I sold that car to my brother in law, it had 121,000 miles on the clock, and ran as good as the day I bought it new.
Still intrigued about this product, though. I want to believe, Normie!
LOL
That reminds me. My truck is way overdue for an oil change. I may just do that tomorrow.