You may find it helpful to read the "Oilology"
Now, lets not get to carried away with the Amsoil, yea its good but its just like any other oil in that it will work good for some (maybe most) but it won't work for everybody. My bike didn't like it at all! I ended up going with 20W-40 YamaLube.
In fact EVERY time I've tried ANY synthetic oil in anything I've owned I've had to switch back to crude oil. Now the best I can figure that is because all of the vehicles I've owned were bought used and had a fair amout of age and miles on them.
They are people that have these bikes and like the Honda line of oils, my bike didn't like them at ALL!!
So not every oil will work GREAT for every application, I put the Amsoil in my bike and it didn't take long to figure out that that was a bad idea!
That's why if someone ask me about what kind or type of oil they can use they will probably get a multiple list.
If someone that has the same bike as I've got, with the same problems then I would tell them to try either,
one of the heavy duty truck oils.
One thing I'm SURE about,
there is no fountain of youth, and there is NO "Wonder" oil, only claims of them!
Amsoil is not a MAGIC oil!, its just a very good oil that a lot of people are happy with.