It has been in the ground for millions of years but it's going to break down in 30 or 40 years once you refine it? Brake fluid or AC fluid is not engine oil so comparing an opened container of it is not a fair comparison. In an engine, there is combustion that causes carbon and other things to contaminate the oil. If you look at something like an air compressor without combustion, I'd bet there are thousands that are 30 and 40 years old that have never had the oil changed in them and are still running fine. The same thing with hydraulics, rear ends, transmissions, etc. on vehicles, tractors and other equipment. As long as it stays clean at the right level, most people don't bother changing it unless something mechanical goes wrong or it gets water or other contaminates in it. As I said before, oil does not lose it's lubricating ability. Why do think it's considered hazardous waste if it spills on the ground. If it's just going to break down, why not just drill some really deep holes in the ground to dispose of it.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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