Here's a comparison on some of the major brands of oil and their contents.

http://www.ibmwr.org/otech/oilreport.html

For more info on oil, take a look at these sites.

Bob Is The Oil Guy - Powered by UBB.threads (http://www.bobistheoilguy.com/forums/ubbthreads.php)

http://www.sportster.org/tech/OilandtheHarleyDavidsonMotorcycle.pdf