I looked carefully at the categories and where to drop this PSA. This seems the most appropriate. If not, I'm sure it will be relocated by our crack team of mods.

50 years of serious wrenching, seen so many things come and go for various reasons.
Oil quality and additives have always interested me, as growing up poor, it made sense to pay attention to things that actually worked to keep the heart of your ride alive, for as long as possible.
I had a cohort in my early 20's that saw a demo of measuring oil quality in protecting your engine. As he described it, a small roller bearing was pitted against a steel wheel of a larger diameter, bathed in the oil as it turned. Measurable pressure was applied to the roller until it smoked. First to fail: Penzoil 30w. Best at the time: Castrol GTX 20-50.
So when I happened upon a similar demo, using weighted leverage to test additives I was keenly interested. The subject was a roller bearing against a hardened spinning steel surface. A stabilizing additive that I have used for YEARS was applied, and when 6 lbs of weight was applied it smoked. More of the same product was applied, at the same speed and weight leverage, no diff.
Enter the contender: a tiny swab of this product not only stopped the noise, but stopped the burning.
I bought a gallon. I have a few high mile cars that I wanted to try it on.
1. Wife's Euro twin DOHC V6. 162K miles. Cringe, even after oil change, on starting. At least 30-45s of clatter from the timing chains. NOW, 15s, if that.
2. '66 Olds Rocket 425 V8. Valve train tapping, on drivers side, intermittent. Now, Quiet...
3: My K10 TH350 is on her last legs. Keeping her clean to keep her alive. Symptom: funky double shifts- as in- reverse is felt, then positive engagement follows. GONE. ( I expect haters to go off on this one! All fun and games!

)
If you find this interesting, and acknowledged that I'm not a Troll (see history?) I'll be glad to share it with you