Great articles on engine oil and viscosity etc, great read!!

[GNVYUS 1]

http://63.240.161.99/motoroil/

This is very informative and check out the Bob is the Oil Guy link.
He talks about the Zinc and Phosphorus additives that are found in the EOS bottles that many have been talking about on this board.

http://www.bobistheoilguy.com/states of lubrication.html