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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

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I've heard all kinds of numbers for this. Two years seems awfully short. Five years looks like a good conservative estimate, but ten years probably is workable when properly stored (avoid freezing temperatures and high heat, so no garage storage). I'd try to stay within roughly 5 years. If you buy a new car and have 5 year old oil, it will not meet spec (e.g., SJ or SL oil and manufacturer specifys SM).
I have worked in the paint and plastic industries including electrical insulation. We would test things before and after 2 weeks in a oven at maybe 300 degrees F. Anything that survived that was expected to last indefinetely. Your oil gets far more heat in a 3 month OCI.

TallPaul makes a good point about not meeting modern specs.

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