I use independant testing and real oil analysis results not self marketing propaganda.
Heck if everyone used marketing information FRAM would be really popular. ohhh.
I really do think AMSOIL makes a high quality product. It would recommend it as a product. It's just not the end all be all like the "groupies" think.
I have nothing against it personally but a lot of their "information" is extremely skewed and also can be taken from "skewed" testing.
