Chainsaws use special "bar and chain oil" that must be incredibly sticky to cling to a chain whipping around at speeds up to 60 mph, or else it would fling off and leave the cutting bar unprotected within seconds. This oil is specially formulated with tackifiers—additives that make it adhesive like honey—so it stays on the moving chain despite centrifugal forces trying to throw it away. Many regions now require biodegradable chainsaw oils to protect forests and watersheds, since a single day of logging can spray several liters of oil into the environment as an ultra-fine mist. Professional loggers can actually tell if they're using the wrong oil by watching for smoke and smelling burning wood, signs that the chain is running dry and friction is overheating the metal.