So what oil SHOULD be used with a new engine AND why?

To throw a wrench in the system.... I have recently installed a roller cam. I was told to use oil that has zinc in it because "oil is not what it used to be so it's best to run a zinc oil or zinc additive with a roller cam as well"
As much money I had to put on the table for the roller lifters and cam I didn't want to take any chances. 10w30 was also the recommended weight.
Need less to say I'm running Joe Gibbs racing oil.