One thing people need to remember about factory fill synthetics....the engines are pre-spun for break in before the oil is ever added. I ran my 360 for about 2K miles before I switched to Synthetic.
I'm on engine 3 of my very own, started from the get go with Amsoil 15W40 Diesel marine. Doesn't burn any more than any Dodge truck or Boat will.
It's not the pre-spinning that makes it OK, it's the moly coated rings, square cylinder bores, and a quality hone. If this is done right, the rings are broke in before the Amsoil replaces the Torco castor oil I use for cylinder/piston/ring lube during assembly.
