There’s some mayonnaise in the fridge a couple years old I’ll use on sandwiches. After family holiday get togethers there’s always leftover ham or turkey, that’s about the only time I’ll use mayonnaise. Every year I’ll pull it out, look at the expiration date and make a choice. Go get a new jar that will only get a third used or live life on the edge and slather on the old stuff. I call it refrigerator roulette