Here is a great link on motor oil and what is what on the labels of oil. Please read 101, its very informative. I will be using Rotella synthetic for all my motorcycle needs, I have heard nothing but good things about this oil, and its awsome with wet clutches. Plus, it also only cost $15 for a gallon of it at Walmart. I am using it in my Honda VTX, and I am going to drop the oil in the KLX and use it in the fun bike as well.

Heres the link
http://members.rennlist.com/oil/Motor%20Oil%20101.htm