Olive Oil
Olive oil should be stored in a dark, cool area, and in a tightly sealed container. Colder temperatures will cause the olive oil to harden into a texture that is similar to butter. A study reported by the Journal of Food Science stated that olive oil may begin to lose its antioxidant benefits, however, if left sitting on a shelf for 6 months or longer.
Vinegar
The great thing about vinegar is that it is self-preserving. The vinegar institute did a study that confirmed the shelf life of vinegar is virtually indefinite. After long periods of storage, white vinegar will remain unchanged. Vinaigrettes that contain garlic, onion, shallots, or herbs may, however, need refrigeration.