Surfriding How long to run Non synthetic oil on new motor?

Ive read many articles not to run synthetic two stroke oil in a new motor in order for it to break in properly. I believe the rings will not seat properly etc. Anyhow, how long should you run a new motor with non synthetic before switching over to fully synthetic for the advantages of a fully synthetic oil?

thanks
 
no sure what engine you have and im sure it varies but my super jet manual recommended mixing 25-1 for the first two tanks. just make sure you have LOTS of spare plugs :)
 
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