Remember them? It used to be one of my duties to fill them out of 55 gal. drums whenever they needed refilling. (not recycled in my case)Remember these?
The town where I went to college had an independent cut-rate gas station that still had them full of (probably recycled) oil by the pumps - IIRC, a dime a quart.
My father was a great sheet metal mechanic, automotive not so much. He bought dry gas and some radiator stop leak for his 55 Olds, put the dry gas in the radiator and the stop leak in the gas tank. I don't remember the outcome as my brother and me took off for the woods when the cursing started.
Nothing but Yale's pellets for my cars! A JC Whitney staple.
This is an example of how they were installed.We could actually refine our own oil right on the engine with this nifty "Reclaimo" system that could be adapted to most engines in the 50s. My dad had one installed on a tractor but not sure how successful it was. I'll have to dig up the advertising and see just how it worked. I think they might have used exhaust heat.
https://www.fordbarn.com/attachments/418819/