Does unused motor oil, kept in a closed container, go bad with time? If so
after how long? What if the container has been opened?
I am aware of the guideline regarding changing motor oil every 6 months
regardless of mileage. I immagine this implies that used motor oil does
deteriorate with time but perhaps only once used. So what about unused
motor oil?
What about transmission fluid? How long can it be kept unused in an
unopened / opened container?
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