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Â· just now. 1  Burger King Cooking Oil. 2  Burger king uses Soybean, Canola, and/or Palm oil to fry their fries and onion rings in. 3  Fruits have sugar, it's natural, but some fruits can even be bad for you. 4  Fruits are sweeter and take less effort to arrange, generally, so I tend to eat more fruits.
I know that some oil is better for deep frying than others and some oil might keep better too. You could always ask a place that deep frys like KFC or McDonalds how often they change their oil but they are likely to change it more often as it would be in constant use with all the chips they fry up.clara Â· 8 years ago. know that some oil is better for deep frying than others and some oil might keep better too. You could always ask a place that deep frys like KFC or McDonalds how often they change their oil but they are likely to change it more often as it would be in constant use with all the chips they fry up. clara Â· 8 years ago.