Yes, indeed, can vegetable oil be substituted with olive oil is a frequently asked question. Olive oil can be used instead of vegetable oil in most recipes, but there are a few important points to consider. First, olive oil has a more pronounced flavor, which can change the final result of the dish. For example, in salads and casseroles, this can be an advantage, but in baking, where a neutral taste is important, the replacement may not be suitable.