Ha ha....doesn't have the torque to run the 28" Tsumura according to those in the know....
I have a couple in my stable that have a little bit of torque
The ingestion of dust etc into saws in particular , has plagued both Stihl & Husqvarna respectively at various stages of different models.
It's certainly frustrating, especially on a new saw!
I have always run the Stihl filter oil in all saw filters regardless of manufacturer, and have never had a problem!
Some of the HD Stihl setups welcomed a small smear of grease around the bottom filter mating surface.
I hope the Dealer does right by you, but I'm afraid the prognosis 4 that ain't good after 10 days.......