Below is a link to an interesting site that has catalogued over 350 motor oils and the properties of each. You can sort the list by any one of the categories (Name, TBN, Viscosity, etc.) and even pick a few to compare side by side. They have even given a numerical ranking for each oil. I found it interesting enough that I added it to my favorites. Perhaps some of you will do the same.

The Motor Oil Evaluator: Motor Oil Comparison Software