Here is an interesting pic of 2 spark arrestors taken from 2 Stihl chainsaws, one using G-OIL 2-cycle, and the other Stihl 2-cycle. I'm not promoting or denigrating either product... just saw the pic in my Web travels and thought it was interesting enough to post. The results are certainly not scientific, but are thought provoking.
https://www.facebook.com/photo.php?fbid=10200831269096465
https://www.facebook.com/photo.php?fbid=10200831269096465