Just run it.
If you're worried about it, just heat cycle the thing a few times in the process, by doing a few minuites of light cutting/ limbing and then shutting it down to cool for 10 Min or so.
Avoid heavy bucking(Not like you're gonna be bucking 30" Oak with a 346 anyhoo) for a couple tank fulls and just go cut some firewood.
As long as the dealer set the thing right, don't worry about setting it rich or whatever, and plain old 50:1 with GOOD mix oil is fine.
Just go cut with it. LOL!!
Heads up though. Right outta the gate the 346 can be a bit of a pooch, and wont start getting good and snotty untill you have half a dozen tankfulls through it. You'll notice it out of the blue.
They get really snotty after a Muff mod.
You're gonna love the new saw!!
Chain and bar break in? :bang:
Just run the things, and take a scrench.
You're gonna have to tighten things back up after the first several cuts with any new chain. All the oil needed for that chain will come out of the saw as it's used. Let the other guys sit and watch steel absorb oil...it gives 'em something to do besides play with pointy things.
Don't let the jealous Stihlheads get to ya.
They get frustrated and cranky over waiting on the MS261 Husky copy now and then.LOL!!
Stay safe!
Dingeryote