I use the Amsoil Dominator series oil in a 20/50, but I think I can get away with a 10-40. Amsoil doesn't offer a 10-40 in a performance oil, so I may go back to the ole Brad Penn. Spring pressures are 135/430.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg