I am still amazed at all the fine folks on here that keep oil around for 25 years and swear by it. I've never considered it. Don't know why people would do things like that to begin with. Eventually, everything has a shelf life and goes bad. Even oil does but when exactly might be up for debate. If I pulled into a garage for an oil change and someone put 25 year old oil into my car, I would be seriously displeased. The API service criteria 25 years ago is nothing like the ones today making the oil back then obsolete for modern engines.......probably rebuilt ones too. My 2 cents.