As others have stated, the cam/springs combo is important. But, if you're just looking for VERY accurate data concerning the ZDDP of common oils, this thread is a good place to start. The data is about 3 or 4 years old, but I doubt that the concentrations have changed much.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
