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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
Mayonnaise is still good for a month after its expiration date (unopened) and up to four months after opening. Eggs, properly refrigerated, should last at least three to five weeks after the sell-by date. A. Those pesky expiration dates on the food you buy may be largely meaningless. Thatâs the latest word from the U.S. Department of Agriculture in a public service video that says food still remains safe up to 18 months after the âsell-byâ date on the package.