Most oils will keep from three to six months. If a cool spot is not available, or you want to keep them longer, they should be refrigerated. Many specialty oils will take some effort to find. I suggest you look for them in large supermarkets, natural and whole foods markets and gourmet food stores. Or you can let your computer do the shopping via the Internet.
Sesame oil is pressed from raw or toasted sesame seeds and each produces a very different result.
Oil pressed from toasted seeds is thick, rich, and deep amber in color. It should be used sparingly as a final flavoring. Add a few drops of toasted sesame oil to your favorite marinade, vinaigrette or stir-fry dish. Or add some to a hot soup just before serving. Sesame oil is not used for frying because it burns easily.