I'm beginning to think Mobil 1 5W-30 is just too thin for me. Is Amsoil's full syn 5W-30 thicker than Mobil 1 at operating temp? Is the ASL close to a 40 weight? How does the Amsoil ASL compare to the German Castrol at operating temp? What are the specs on Amsoil's ASL 5W-30? Thank you for your help!