How long past the expiration date is mayo safe?

Mayonnaise can generally be safe to consume for up to 3 to 4 months past its expiration date if it has been stored properly and shows no signs of spoilage, such as an off smell or changes in texture. However, this can vary based on the brand and whether it has been opened or not. Always check for signs of spoilage and use your discretion. When in doubt, it's best to discard it to avoid any foodborne illness.