Interesting article on how oils are made...
https://blog.amsoil.com/is-motor-oil-made-from-natural-gas-better/
Yep, interesting.
About Amsoil and other american suppliers, remember that engine lubricants for USDM vehicles are usually different from EUDM products since fuel composition is different. So it's better to not buy and use american lubricants for cars running in Europe.