The Subaru Idemitsu factory fill has higher moly and ZDDP than the dealer service fill. Odd thing is that sometimes Subaru factory fills show high ZDDP and sometimes they do not.
Can you provide a source for that information?
When I bought my Outback, I specifically inquired to Subaru on this subject, wanting to know how long I should wait to change the factory fill motor oil. Subaru replied that as the factory fill was standard synthetic 0W-20 motor oil, there was no need for any particular oil change interval for the factory fill. They further stated that if I wanted, I could change the oil early but there was no reason to change it before the recommended oci.
Further research told me that almost none of the manufacturers fill their engines with "break-in" oil any longer, as it really was not necessary with modern engines and today's engine assembly practices. So I'm pretty skeptical when I see claims that any OEM still puts "break-in" oil in an engine.