at marketing their product. They can sell you Sh$% and make you think it is as good as chocolate. Would you get on plane with a pilot who is not licensed by the FAA? They can make any excuses "aw it costs too much to get license" That's the excuse Amsoil is giving. Or Amsoil is using proprietary additives or blends. So they don't want to reveal that to the certification board. Yet Amsoil charges almost twice as much as the competitors oils.