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I'm sure Toyota or subaru have run the engines at one point with mineral oils to allow the rings to seat. Trying to break in your engine with synthetic oil is not the best way.
most engines these days should be broken in by the first heat cycle. We always use either Motul or Amsoil engine break-in oil during this time to better aid in that process for the fresh new engines.
I'm more concerned about the drivetrain fluids being contaminated with the shavings from the gears properly breaking in.
Our car will see a complete fluid change at 500 miles.
engine / trans / diff.... car should be seeing track time once that has been done.
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