(Use small bowl on food processor. Will help in emulsification.)
Oil: I used Sunflower oil the first time and it turned out nice. You can use part olive oil, but be aware it will impart flavor, so it would be smart to not only use olive oil.
Storage: in the refrigerator
Other: I may have added slightly more mustard and salt than it calls for, though we like it a bit more tangy.
Find it online: https://recipes.jordanprins.com/mayonnaise/