Question: do you have to refrigerate used canola oil?
Answer: Store the used oil in a sealed and light-proof container for up to 3 months. For best quality, refrigerate used frying oil that you want to use again. If the oil is clouded or if the oil starts to foam or has a foul odor, taste, or smell, discard it. ... Thus, do not dispose the oil near lakes, streams, or watersheds.