OP had ONE reply to this thread, back at Post #22.. a special Thank You to OVERKILL, 930.engineering and others who came in with some great technical info, this is a lot to take in, but is also amazing and fascinating, in it's own way.
Me, personally, I may be sold on the HPL or High Performance Lubricants products, they have a very good blend, I've seen their operating as to how they actually make, test, and verify the oil firsthand, and there are not robots working there, just real, also busy people that graciously made time for me, now I have nothing but positive things to say about them AND their products. And I hate paying shipping so I'll just drive out there some random day (I'll tell or ask them first lol) to buy more, including PCMO. Since my oil leak doesn't appear to be going away any time soon. But that's just me.
I also notice more engine smoothness, but this is getting into the realm of the unscientific.
And I actually chose HPL products to UN-do an overdose of Ceratec, Mos2, and another additive that I never should have considered, and is probably why I will never walk into a NAPA again in my life, since I did the whole
well, okay, let's use that and put
Restore! - which is blue slime that looks like paint - and has gold flakes in it, which, if you didnt tell your mechanic that you put that in, would say that that looks like glitter oil.. I will be happy when that flushes out, hence my inquiry and follow-up friendship and endorsement (strictly professional) of HPL oils and my road testing of their EC, which I have amassed well over 5000 miles in less than one month and the filter cut-opens (the white one is the one put on after 1000 miles on the EC and still on) from 53' Stude
are coming, grand total 4 engine filters and one Engine Oil style trans filter because, why not.... The additives worked "okay" but results always tapered off, and who knows, may have sealed in sludge, blocked up an oil passage, had adverse effects for wherever your oil goes, all this pure speculation.
And, to answer the original question, good luck on stating your opinion wi..never mind. I used to always use this. That may be a thing of the past.
The below product, also Ceratec, changes the color of your engine oil to a state that makes a mechanic think there is something wrong with your engine and kind of looks like grease. No good. Always off-putting.