Not interested in the above user, but I use amsoil. Never gotten into the 'pyramid' part of it, like amway it is mlm but just what seperates something from being just mlm and being a pyramid scheme I don't know. I sell to noone, buy from noone, just amsoil.
Just like any other oil, you find people who are staunch supporters and others who are rigid opponents. My opinion for any oil, any engine, any fuel, is to try it. Use tests at various intervals and see how it stacks up. What works great for one person may not for you, regardless what testing shows.
James