Originally Posted by Linctex
Around the farm, all used oil was used up for other tasks.
Oiling roller chains, lubricating the sickle bar every morning, treating wood, killing weeds around buildings, etc.
Yes, I remember. Also oiling the sliding shutter at the bottom of the fertilizer spreader, rust-proofing the shiny surfaces of shovels, hoes, plows, and disks before storage, and controlling weeds in the gravel driveway.
I suppose waste oil sprayed or trickled thinly on a road or driveway is considerably less likely to contaminate the water table before bacteria take car of it than as much oil dumped into a single post hole as Popular Science suggested.