Amsoil's latest news letter brags about how there 10W-30 oil went through the most rigorous test ever by an oil. They claim the normal time an oil goes through this Sequence IIIF is 80hrs. They put there oil in for 240hrs and it should great results. The oil held up. No other details. Amsoil's CEO claims only a few other oils, Mobil 1 etc, could go only to about 160 and have never been tested this far. Is this another test that means nothing?