I want to be clear on two points: first, I'm not criticizing you for your choice of Amsoil. Second, I didn't say that Amsoil products are in any way inferior or that they don't meet API or GM or Ford specs. There's just no data, one way or the other.Actually, there are plenty of BS UOAs posted here and on numerous FB 350 pages (again, do your own research). As for SS not meeting API, there are formulation requirements that Amsoil doesn't meet, that in no way means it's not a better oil, it just doesn't conform to their standards. You can see numerous YT videos or head on over to BITOG. I've done my due diligence in regards to choosing my erl. Lastly, You answered the question in regards to synthetics for yourself in your first para.
What puts me off about Amsoil is that they use marketing language that convinces innocent people that they meet industry specs without providing a shred of independent evidence. In essence, they put a shroud of mystery over their product's performance, and then claim that their secret sauce is so superior that those tawdry standards that were written for inferior beings with inferior cars just don't matter. It's malarkey. Now, the products actually do work pretty much as advertised, so if you use them, nothing bad will happen.
As for the UOA stuff, I've done them for 15 years, I spent 10 of those years on BITOG and I was an early Dyson Analysis client. I've also, at one point or another, read through pretty much every new oil spec since 2001 - ACEA, API and ILSAC - and I've purchased all the WSS Ford lube specs for all of the Ford vehicles in the family fleet. I don't claim to be an expert in oils, just a well-informed consumer. Lastly, if there are Amsoil 5w50 UOA on FaceBook, Google can't find them and I'm not ever going to be a FB member, so that's it for that.