Here's a recent uoa on the ASL.
The Amsoil Heavy Duty Diesel 5W30 has more anti-wear additives than any Amsoil and will probably be better for bearing protection that the ASL 5W30. Their Euro oil is 5W40 and not 0W40, but I don't hear too much about it.
xw30 oil is a 30 weight at operating temp, regardless of what the first number is. The first number only refers to cold start pumpability. Check the Product Data Sheet at the bottom of each oil page on Amsoil's web site. The viscosity at 100C will all be similar for 30 weight oils. An oil with a higher HTHS is a more shear stable oil.
Also try bobistheoilguy.com for Amsoil recommendations.