from what and the way I understand it is YOU DO NOT use a synthetic oil for Brake in. The RINGS will Not seat like they should. Due to the synthetics after the 500-1000 mile brake Then it is ok to Change over to the synthetic oils.
The Main Object to the synthetic oil is to REDUCE
Friction. Reduceing friction at Brake in would not let the rings seat/seal like they should.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.