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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.
1 Storage time shown is for best quality only â after that, the mayonnaise's texture, color or flavor may change, but in most cases, it will still be safe to consume if it has been kept continuously refrigerated.