Has anyone ever used it for oiling wooden fence posts? I guess I'm wondering what tractor hydraulic oil is made of, and if there are any "ranch" uses for the used oil. I'd rather not have to haul it to some facility.
Many old ranchers used to use it too spray on their roads, and many kept a drum of oil that they saturated kept replacement posts soaking in. Another popular thing was to use it to kill weeds along the fencelines.
Then again, many just had a "spot" somewhere on the ground that they poured all the old used oil on.
Generally, those are not well recieved practices today.
If you have much volume at all, with the high prices of oil at present the guys doing alternative fuels are looking hard for clean feedstock, it probably has some value.
You could also look at some of the various used oil burners, "black gold" springs to my mind but there are several, as well as some featured in Mother earth news etc.
Most recycling, and your uses etc. will be dependent upon volume that you are producing and that will open or close different doors for you.
We probably move about 6000 gallons every two or three weeks, gives us some options. If you are doing 55 gallons a month though, it starts to constrain you.
If it were I, I would not consider much that ended with the oil hitting the ground. Even if you choose to argue that it is not that bad, many of your neighbors will probably not share the same view, even if they do share the same water supply.
