Re: Does Unused Motor Oil go bad?

ThomasE wrote:
> 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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> 

As long as it's in a sealed container it should last indefinitely.  Once 
you put it in an engine it's not that it deteriorates, it's that it 
picks up impurities and moisture.  Part of the job of oil is to hold 
that stuff until you change the oil and get that junk out of the engine.

Jeff DeWitt