Best Oil to use for break in period - 5000 miles?

[DrewDong]

Hey, the real question i had, was whether or not the nissan ester oil or another type of 5w30 oil would be better to use for a brand new engine. I understand that the inside rods (or something like that) have to be smoothen out in order to get the best possibile mpg , power, and longevity. And certain oils shouldn't be used during the first 3-5k miles of a brand new engine for it will result in the inside cylinders (or something like that) to develop rugged edges and decrease all of the above. So which oil would be better to use between 1200-5k miles on an engine? Would nissan ester oil or lets say mobile one 5w30 be better. Any help would be appreciated, thanks in advance