How much vitamin e should i use to preserve 1 gallon vegetable oil?
If I understand your question properly you want to know how to keep vegetable oil from going bad or rancid. What I do not get is why you think you need to use vitamin E. It is best to store all oils in the refrigerator or a cool, dry place. Oils may thicken, but if you let them stand at room temperature they will soon return to liquid. To prevent negative effects of heat and light, take oils out of cold storage just long enough to use them. Refined oils high in monounsaturated fats keep up to a year (if they are olive oil, they’ll keep up to a few years), while those high in polyunsaturated fats keep about six months. Extra-virgin and virgin olive oils keep at least 9 months after opening. Other monounsaturated oils keep well up to a high eight months; unrefined polyunsaturated oils only about half as long.
