I'll run just about anything that is cheap.
There are only two that I have found that I wont run again.
The Crap sold at Menards looks and smells like somebody drained a septic tank, and then filtered the rinse water through a nasty old sweat sock.
If it isn't filtered motor oil, it's some other crap I don't want on me, on my saw, or in the air around the saw that I am breathing.
"Do-It" Brand Winter weight. Sold at hardware stores.
The stuff is absolutely the WORST mung ever sold as bar oil, and has the viscosity of peanut butter at room temp, and pizza dough below freezing.
Ya can't even get the stuff out of the jug without resorting to ketchup bottle antics when it's in the 30's.
If ya want to burn up a chain,Bar, and an oil pump at the same time, this is the stuff.
I kinda like the runny Poulan Red stuff.
It's great for cutting when it's cold but not real cold, and it's always good for a laugh or two dripping all over the bar leatherface style.
Stay safe!
Dingeryote
It's funny,the northern guys complain about too much viscosity,and the southern boys complain about that thin as water runny stuff that don't stick to the bar...