YouTube UOA Testing of Amsoil SS vs Penzoil Ultra Platinum on Ram 2500 w/6.4L HEMI

I do put iron and copper pieces in some of my oil oxidation tests, because of their known catalytic effect on oil oxidation. Amsoil SS caused much more copper leaching on virgin copper than Quaker State synthetic and VRP than at high temperatures. After the copper in the Amsoil SS formed enough of a protective chemical film, the rate of copper leaching greatly decreased.
In this particular case, maybe continually switching between oil chemistries (brands) might cause more copper leaching until each other chemistry forms its protective chemical film?
 
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but you can take a quick look at the UOA results and see which oil is better for his engine and how he uses it.
No, you can't.

When you start adding up wear metals, reality has left the set, that's as politely as I can put it. These engines leech copper:
2019 RAM 1500 2023 UOA data only.webp


As @dnewton3 points out, there is far too little data here to support any sort of statically valid conclusion.
 
In this particular case, maybe continually switching between oil chemistries (brands) might cause more copper leaching until each other chemistry forms its protective chemical film?
I suspect that what increases copper leaching over the life of an engine is using less copper-friendly oils, regardless of whether one switches between oils. Suppose Oil A is more copper-friendly than Oil B and they are magically otherwise identical. Over the life of the engine, I think the most total copper leaching would occur if you only used Oil B. I think that alternating between Oil A and Oil B would have less leaching, and least of all would be to use only Oil A. I could be wrong and hope to get more information on this topic.
 
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