Oil additive ?

[supertruck]

Everyone has their preferences. I use Amsoil Dominator in my 340 Dart and my mini-stock S10 circle track racer. No issues at all.

 

[Woody500]

I made Zinc Dialkyl Dithiophosphate (ZDDP and other acronyms) when I first joined Chevron's additive division in 1981. There are several types of ZDDP based on the alcohol group that makes up the hydrocarbon part of the additive. I can discuss this further if anyone is interested. ZDDP is a sacrificial additive that is depleted with age and is one major reason for changing oils (the more frequently, the better). But is also works by corroding the lifter and lobe surfaces forming Iron Sulfides and Phosphates that prevent destructive metal-to-metal contact of surface asperities.

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Wear occurs when the points of the asperities microweld to each other pilling apart the surface. ZDDP forms a film of sulfides and phosphates that do not microweld slowing down (considerably!) the normal wear process. But excessive amounts of additive are detrimental to this process causing faster wear, but still slower than if too little ZDDP is present.
As this additive is part of an overall additive package used to make finished engine oil, it is better to trust the oil formulator and company marketing the oil than it is to haphazardly using a top treatment additive. Yes, a ZDDP additive can help a modern oil protect slider follower camshafts from wear, but how do you know that what you added isn't causing other issues due to incompatibility with the existing additives in the oil. So I recommend using a name brand oil formulated for older engines over top-treating a product that may not be formulated for slider follower camshafts.

Could you pre-treat(corrode)lifter faces & cams with phosphoric acid(OS-PHO) to gain any of this protection?
Is that also why some camshafts were coated with a black, not necessarily smooth coating from the factory? Phosporic acid? Maybe some still are coated that way today?

 

[RLF Cuda]

Manganese phosphate is applied to steel for improved wear resistance. Specifically, engine parts, such as camshafts, gears, and piston rings, benefit from the coating’s protection, especially at performance break-ins. This protection is to prevent galling and control the wear of the moving parts.
https://finishingandcoating.com/index.php/conversion/1313-phosphate-coatings-some-basic-points#:~:text=Manganese phosphate is applied to steel for improved,and control the wear of the moving parts.

 

[QuickDart360]

Nobody mentioned Penn grade oil. Or Schaefer oils. VR-1 Valvoline is also good.

 

[RLF Cuda]

Early on and into the 1970's, base oil was refined from crude oil by solvent extraction and distillation to get the viscosity grade desired. This practice meant that the base oil quality was dependent on the crude used to produce it. Nowadays, crude oil used to produce base oils are severely hydroprocessed so that the end base oil is marginally or not at all dependent on the crude oil source. Chevron in Richmond, CA makes most of the West Coast base oil from Alaska North Slope (ANS) crude where as Motive in Port Arthur makes base oil from imported crude from the middle east or elsewhere. Both base oils are used to blend name brand lubricants meeting all the same specifications including API SN for passenger car applications and API PC-12 for heavy duty diesel engine oils. The base oil is essentially identical although the crude used to produce it is very different. The magic of modern-day oil refining and chemistry.

 

[Jim Kueneman]

Break in oil has several thing different including more zinc and and no friction modifiers. I love one of the comments in this:

"If oil companies found any use for anything else to add in then they would and charge you for it." Anything you add to the oil either does nothing or actually makes it worse from my research.

Also the video is Lake who created all the formulations for Joe Gibbs oils (what I use to break in). He is data driven and does not make up opinions. His statements are based on testing and data analysis.

https://bobistheoilguy.com/forums/threads/more-zinc-more-wear-with-lake-speed-jr.382123/

Jim