Recommended oil for initial 500 mile break-in?
 

I am replacing my 4.6 N* with a reman and have been told to break it in with non-synthetic oil although I have been advised to run only synthetic in the N*'s. I put Mobile1 in the old engine. What is the recommended "break-in" oil for the 4.6L N*'s? What is widely recommended after break-in? Thanks in advance !