I came here with similar questions over a year ago. What I took from all the discussions and tips is as follows:
1. Run the saw WOT in wood no matter what the age of the engine.
2. Try not to run it WOT out of wood for the first few tanks (as stated in the manual).
3. In general, full synthetic oil is run by folks who cut for a living and those who want to get the most life out of their engine with possibly longer periods between engine maintenance. If any of those appeal to you, make your oil decision accordingly.
Gary, did I pass OIL 101? :greenchainsaw: