Last one I did was with shell rotella T diesel oil and a bottle and a half of GM EOS. But here we could (in summer 2009 anyway) still get the old style EOS that at that time was no longer available at US gm dealers. I've been meaning to go back there and see if I can get a few more bottles of the good stuff. I know hughes sells a special break in additiave and I think comp does as well. I've heard nothing but good things about the brad penn break in oil, I think I'll give theirs a try when I put together my new motor. A roller cam would be nice but it is an additional cost, and roller rockers and roller lifters are not without their own set of problems.