Mapper,
No argument here--the majority of engine wear does indeed occur at startup, especially at extremely low temps rendering mineral base oils with high parafin content in a waxlike state, totally incapable of any circulation whatsoever.
The point that I was trying to make is this--Amsoil is the best oil available so why would you intentionally use Mobil1 0W30? To save a few bucks, yes, or because you can pick it up down at Walmart?
And yes, Amsoil has been around for a while. Amsoil is in fact the first synthetic motor oil ever, try 1971.