I'm still using ARCO two-sroke oil that came from a gas station I worked at in the 1970s. Works fine as far as I can tell.
Here's what one oil company says on the matter:
ISSUES: The range of shelf life of lubricants recommended from one manufacture to another can vary from one year to almost infinity. There is no straightforward and meaningful method to determine the shelf life of lubricants. One simple reason is that storage environments greatly affect the shelf life of lubricants. Not all lubricants are stored under identical or ideal conditions.
TECHNICAL DISCUSSION Several factors can influence the shelf life of lubricants: Product Design: Chemistries and additives - some formulation chemistries and certain additives are more aggressive than others. The nature of the chemistry can affect the shelf life of lubricants. Storage Temperature: Both high heat (greater than 100�F) and extreme cold (lower than 0�F) can affect lubricant stability. Decreasing the storage temperature can cause sediment formation and additive separation. The ideal storage temperature should be between 45�F and 80�F.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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