Conventional Oil for Gear Break In

[gpurp]

Does anyone know why conventional oil is recommended for ring & pinon break in? I thought synthetics were better in most every way or at least that's what marketing tells us. Dynatrac implies that synthetics don't flow the same but I'm looking for a better explanation.

https://www.revolutiongear.com/ring_and_pinion_break_procedure
https://eastcoastgearsupply.com/ft-1479-new-gear-break-in-procedure.html

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