I'd run a lighter weight oil for break in. As long as your adding a bottle of additive with the extra zinc anything will be ok. The break in oil doesn't stay in that long. I would personally use some 5-30.
As an added note to initial start up is not to use starting fluid or dump raw gas into the carburetor. Doing that is a good way to wash the oil off the cylinder walls and also dilute the oil in the pan if to much gas gets dumped in.
Good Luck
Don
