after scouring the internet I've found a couple web sites that explain the oil differences alot better than I could.
http://www.ibmwr.org/otech/oilreport.html
I also have a bmw
and
http://www.totalmotorcycle.com/links.htm#oilproducts
the links to the tests on oil filters is very interesting, I think I will pass on Fram filters from now on........