This past week we had a engineer from Exxon/Mobil at work discussing with us the uses of their oils and greases and synthetics . I'm not gonna knock on E/M but after hearing what he had to say , I had to put my $0.02 in . Once I started talking about Amsoil and what their products have done for me he made the remark that the only other oil out there that was comparable to theirs was "Amsoil" . You could almost see him squirming . It was a good class though .