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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.
Once they are opened, however, they need to be consumed within a day or two which is why we buy smaller packets and/or cans of juice. 10) Mayonnaise - I know, I know...most of you just made a face and a noise and maybe even wretched a little. But I promise you - mayonnaise does NOT need to be refrigerated.