New Engine Break In Process

[mts]

My car recently experienced the dreaded IMS failure and was replaced with a new crate engine from Porsche. When I asked about the break in process they simply said drive it conservatively for the first 1,000 miles or so and then I was good. No need to change the oil beyond the standard recommendations.

The car currently has Mobil 1 synthetic in it (they put it in) which I want to get out of the car as soon as possible anyway. I don't want to start a war on oils, but the question is do I replace the Mobil 1 with the synthetic of my choice, or a dino oil for the first 1,000-1,500 miles which I then would replace with the synthetic of my choice?

It seems like everything I've read indicates the dino oil first with a change after 1,000-1,500 miles back to synthetic is the way to go. However, that's different than what Porsche said. Can anyone point me in the direction of a good article or two on the subject or have any thoughts on this?

Thanks in advance.