Covered oil can be stored in a cool dark place for up to 3 months. Never store oil in the refrigerator. Replace the oil if you notice:
  • excessive smoking at normal temperatures
  • strong oil discoloration
  • a rancid smell
  • excessive foaming around the frying food
When frying with strong flavored foods (like fish), the oil should be cooled and discarded after use. If frying with mild flavored foods, the oil can be cooled, strained through a cheesecloth (to remove crumbs) and used again.