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There's a whole variety of different forms of fuel/oils. Anywhere from oil that doesn't burn off easily in a chainsaw (castor oil), to oil that does (most synthetic oils), to fuels that are oily (kerosene), to fuels that dissolve oil (gasoline), to hydrocarbons that are only liquid under high...

They will run on diesel, but not on gas when there's too much mix oil. Diesel evaporates and burns much more easily than mix oil, but has too low of an octane rating.

The 170 and 180 have some of the worst emissions. The Echo 352 had them beat, but they still updated it to the 3510 strato port, while Stihl keeps cranking out the global warming generators at a much higher rate.

Most saws are tuned to run on 50:1 from the factory, 25:1 is about the most oil you might get away with running without adjusting the carb, if it would even run at all on that much oil, or rather that little gas. Some oils do not evaporate and burn off easily: castor, Red Armor are a couple...