We have a good tech article about this subject on our website. (http://www.hughesengines.com/TechArticles/1engineoils101.php). Here at our shop we use Joe Gibbs Driven oils. We are convinced it is one of the best oils available. Call Dave and ask him about some of the high spring pressures we have had when breaking in a cam. Diesel oils are removing almost all of their zinc package since diesels are now required to run converters. Additives like ours or Comps or whoever, are okay if that is all you can get. They seem to work but the oil companies all tell us that simply adding a package to an already blended oil is not really the best way to do it. For an oil to be blended properly and work to its best ability, the additive package needs to be blended at the refinery. One of the reasons we like the Driven oil is that not only is it high in anti-wear agents (like zinc) it is also very low in detergents. Detergents and zinc actually fight for the same spot in your engine and they can't both be there at the same time.
Joe Gibbs has tons of great videos and articles that can take you as far into this as you want to go.(http://www.joegibbsracingoil.com/trainingcenter/index.html)
If your questions aren't answered there give me a call and I can hook you up with Lake Speed Jr. He is a certified lubrication specialist and loves to talk oils.
In our opinion, based on our experiences, we have had good luck with the following break-In oils.Joe Gibbs Driven, Brad Penn & Royal Purple. We always suggest using a real break-in oil even though we do offer an additive.We stock the Gibbs oils here at our warehouse.
Thanks, Kevin