I know a few arborist who run AmsOil at 100:1. They are anal about their fuel and mixing as well as chain sharpening. They do not let anyone run their saws.
The key is good fuel. The more ethanol the fast you get “phase separation” in the fuel.
If you want to see phase separation, take your...
One of the biggest challenges / killers of an air cooled two-cycle engine is heat.
I’ve seen people run the best 2-cycle oil but if they mill lumber with a dull chain, the heat is too much for the lubrication to handle.
When ripping logs, I’ve seen the air intake plug with the wood “noodles”...
Those replacement spouts are sold at Canadian Tire, Tractor Supply and the Large ACE Hardware locations.
They work Great!
I use the No-Spill cans for the 2 & 2.5 gallon.
I use the Ultra Mix oil in my MS 500i and my 4-mix units. Mix it at 50:1.
I use the standard STIHL mix oil and 50:1 in every else. I use 50:1 in my old Contra and 090’s that were built in the 1960’s.
My wife uses whatever 2-cycle I have mixed.
The metal shed doesn’t have a floor so you would be pouring concrete or building a floor system out of treated lumber and putting decking on it.
I’m not sure how tall you are but a 5’ 4” tall shed seems a bit short. I’m not sure you could hang a straight shaft line trimmer in a vertical...