Oil loses a lot of its virtues if it is more than six months old. Most oils should be changed after eight to ten uses. You need to remove oil from the deep fryer after each use, strain it and store it correctly until the next time. A good tip: keep the filtered oil (food residue left in the oil will give it a bad taste) in a cool, dark place until the next use. To do this, pour the strained oil in a one-litre pop bottle that has been well washed and dried. Use a permanent marker to write on the bottle – indicate the date of the oil’s first use and add the date of each successive use.
“How long does oil keep in the deep fryer?”