Does engine oil have a shelf life? Suppose that I buy a case of oil.  For some reason I stop flying and the oil sits in storage for a sufficiently long time.  After that, I decide I want to put it in my engine.

Is there a point after which (reciprocating) engine oil should no longer be used after being kept in storage?

If the answer is "Yes", what sort of time range is it?  Months, years, decades?
Engine oil in quart plastic bottles is considered to be good for 10 years unopened.

The Exxon document here lists a 10-year shelf life for each of the oil products listed when stored in unopened, undamaged quart containers between 0 and 40 degrees C (32-104 degrees F).