No amout of googling shows a 4 ball test for 2 cycle oils that I could find. Give us a link. I'll happily stand corrected. 4 cycle motor oils, yes. They definetly use that standard as part of their advertising.
I mentioned those other tests becauce you threw a blanket over 4 and 2 stroke oils, not just 2 cycle with regards to Amsoil using that
method. Those other tests are relevant to 4 cycle motor oils.
AMSOIL is a blender, no different from Ashland (Valvoline), Eneos, Royal Purple, Fuchs, Motul...etc. There are very few oil companies that produce all of their product in-house, particularly for all grades. Mobil is one, Shell is another. BP doesn't produce PAO, so any oil grade that contains it, like Castrol 0w-40, is using a base sourced from somebody else like ExxonMobil or CP. Similarly, additive packages are produced by a small group of players with the two biggest ones likely being Lubrizol and Infineum, the latter which is a joint venture between Shell and Mobil.
My issue with this is how the how and the why you responded with the "Amsoil.....grain of salt" quote. I care less what you think or feel about Amsoil or any other company. I don't sell it or make a cent from it. I do however like people to see the whole story not a 1/2 truth used disqualify a source used for another point. Aka the no oil naturally prevents rust in an engine point. The fact you use the "Amsoil uses the 4 ball test therefore has no bearing on the subject" is kinda underhanded. That company has been around longer than you have been alive. They didn't survive by not delivering on the claims. You get sued out of existence. Hell Mobil sued Castrol over claiming Syntec was full synthetic while using class 3 base stocks to produce it. They lost and started doing the same thing. That's ok though. They are a real oil company. The whole truth is, yes Amsoil uses a modified 4 ball wear test for 4 stroke motor oils and they also explain the how and the why clearly on their web site. This will be the last I respond to you because its a loosing battle. It's just going to drag the threads down. I know how you operate, Mr. Ben Walker, from reading every single post in the AS oil thread and the one here. You being wrong isn't an option.