I use nothing but vegetable oil in my saws and have been doing so for decades. When the frying oil becomes too dark I filter it through a paper drip coffee filt

I use nothing but vegetable oil in my saws and have been doing so for decades. When the frying oil becomes too dark I filter it through a paper drip coffee filter and store the result in the wood shed, to be used when harvesting and preparing the ~8m³ of firewood needed to heat the farm through the Swedish winter. It works fine in the cooler climate we have here, in really hot places you might want to add something to make it stick better. I hardly ever get a broken chain, the bearings don't wear excessively and I get to use them until the chisels have been filed to the last remaining mm.