Comment by AngryData
11 hours ago
If you want a clean cheap petroleum oil, chainsaw bar oil will work. Generally I prefer the generic Tractor Supply bar oil because it seems a lot stickier than walmart's version which seems more like hydraulic fluid to me. But either way it is cheap because in a chainsaw 95% of it is just sprayed all over the place anyways.
The last time I bought chainsaw bar oil I think it has added sulfur or something like that. I'm not really sure. It's actually worse to work with than used motor oil. Used motor oil starts out clean & is constantly being filtered in a normal motor.
Might just depend on the brand and luck. Ive always suspected that bar oil was either extra of whatever oil product didn't sell at the time, or an oil product that didn't technically meet spec for another application like hydraulic or transmission or engine oil.