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Once upon a time I paid $60 for a car that was burning a quart of oil every 90 miles. The previous owner had not changed the oil in several years because, as he said, "it changed itself".
After replacing the valve stem oil seals, the oil consumption improved to 150 or 180 miles per quart. I changed the oil, drove it around the block, and the new oil was black. Compression was good, it started good, it ran good, gas mileage was good.
Just for grins and to see what would happen, I changed oil every time it was down the second quart. Oil consumption slowly, but steadily, improved. After four years, it got 950 miles per quart. Then I sold it for $100.
I do not buy into the theory that oil "changes itself".
Four years with negative depreciation is not bad.
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