Many people buy their Evinrude XD 100 oil in bulk in order to save a little money. But oil, like all liquid lubricants, will go bad over time. However, the way you store your oil can significantly prolong its shelf life. Be sure that the oil is stored in a dry area which isn’t subject to severe temperature changes. The oil will also last longer if it remains sealed and unopened.
Most oils will last four to five years on the shelf, but you have to remember that technology is constantly improving. What was state-of-the-art oil five years ago may be obsolete today. Simple oils will have a longer shelf life than more complex formulas. For example, base and process oils will last at least three years while metal cutting oils will only be good for about one.