(AP) -- Phil DeVore pulls a folded piece of aluminum from a murky pond. The aluminum looks like a piece of siding that's blown off a building, but DeVore knows it's much more valuable than that. He slips a rubber band off the aluminum and unfolds it. He likes what he sees -- 50 or 60 glistening black leeches. They're your common ribbon leeches, Nephelopsis obscura to aquatic biologists.
Store the oil to be reused in cooking or deep frying for no longer than three months and avoid re-using the oil for deep frying more than once or twice, as the smoke point of used oil is reduced after multiple uses. Avoid pouring your used deep fryer oil down the drain or tossing it in the trash.
If this fat is combined with other oils, it will typically last the longest, but pure peanut oil left open is best in terms of quality if you use it up before the expiration date on the bottle it comes in. Image used under Creative Commons from ratna rajaiah. How long does peanut oil stay good for in frying appliances? Whenever you are using peanut oil to cook food in fryolators it is wise to only use the only three to four times because it tends to take on the flavors of the foods you cook in it and loses its quality quickly after coming in contact with foods and being heated repeatedly.