I've performed quality audits at Shell, Citgo and a little blender named DA Lube in Indianapolis. The big guys have extensive labs and are beyond serious in their tribology. The little guys partner up with the additive companys. The additive suppliers are another ball game all together. All oils have additives. Did you know that full synthetic oil is still based on dino oil? True story I kid you not. I guess my point is that if you stick with a big name oil product you should feel confident in its R&D and quality controls at the blender.