Well I havnt been in here for a bit but I have changed a few things oil wise.
The benol...... great protection, smells great but left a nasty black coating on the piston after a few tanks.
Valvoline fully synthetic racing oil...... works great, clean and no real complaints.
Have moved to Castrol Activ 2T ester based oil at 40:1 mixed with 91 RON
It smells really nice.... like oil should, MUCH less smoke than anything else I have used thus far and thats based on running in a sealed garage. I no longer open all doors and stumble out coughing after tuning a saw.
I also found my saws and wipper snippier seem happier on it.