Amsoil is amazing. An Amsoil peer used a show & tell  display that had three containers of oil, all equal viscosity and volume, in a box of dry ice. If you've ever stuck your hand into a box of dry ice, it's darn cold. Two of the three where common brands petroleum based motor oil , the other Amsoil 5W-30. In each, a stir stick that you could stir. The Amsoil was easily stirred but the other two where solid and where impossible to stir due to the effect of extreme cold. That's amazing.