What do you do with leftover oil from deep fryer?

Leftover oil from a deep fryer can be reused a few times if it's filtered and stored properly. Allow the oil to cool, then strain it through a fine mesh sieve or cheesecloth to remove food particles. Store the clean oil in a dark, cool place in a sealed container. If the oil has a rancid smell or off flavor, it's best to dispose of it properly by taking it to a recycling center or following local disposal guidelines, as pouring it down the drain can cause Plumbing issues.