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Synthetic oil is still good old black stuff from the dinosaurs. The difference is that its refined to higher levels and the best chemical properties are combined to make a single compound containing only the most critical components for that specific market.
Basically if regular oil contained Aa, Bb, Cc and Dd chemical properties, the refiner would extract and separate all the Aa and all the Bb from all the Cc and Dd parts. If the Aa parts provide the best friction protection and the Dd parts provide longer oil viscosity then they would only combine those two parts to get the best friction and viscosity oil.
If there is any reason to use a regular oil for a specified amount of time it would be to properly seat all of the moving parts such as bearings, rings, lifters etc. This would provide optimum sealing of the surfaces to provide the greatest power. It might be old school thinking but that's how I was raised and I have followed those rules with great success. There is no doubt that synthetics provide greater benefits beyond standard oil but at what cost? For every pro there is a con...just depends on who you ask.