Can You Use Expired Cooking Oil?
Author - Larry Law
Kitchen cooking oils will not last forever. Depending upon the oil, it can go rancid in a matter of months or a few years. You don't want to cook with rancid oil because it smells like wet socks and the living components have lost their vitality. But the good news is, expired oil won't hurt you. There is no water in it, so no mold can grow to make it rotten and dangerous. It can still be used for creative applications. According to the United States Department of Agriculture Forest Service, “Vegetable oils have many good natural properties including good lubricity, good resistance to shear, a high flash point, and a high viscosity index.” These qualities make them quite versatile in a number of applications. You might consider keeping your old oil rather than throwing it out. Recycling expired oil could prove to be a valuable asset in emergency situations.

Surprising Uses for Old Cooking Oil
Rust proof metal to keep it from rusting. The molecules in oil cannot be dissolved by water. Oil and water don't mix. You can also remove rust. Linseed oil works well for cleaning steel surfaces. Vegetable oil is best for cast iron.
Biofuel. While you can't pour cooking oil into an automobile engine, there are ways to treat it so it can power a diesel engine. Here's a link that explains what would be involved. It would be expensive to make the diesel engine modifications and probably not cost-effective, but in certain situational environments...
Lubrication. Cooking oils are a great backup lubricant for cutting down on friction. Hinges, metal parts, bicycle chains, chainsaws, etc. Coconut oil, vegetable oil, and olive oil are particularly effective.
Protecting garden tools. Oil protects wood like it protects metal. Cooking oil represents an effective sealant for wooden handles on gardening tools (in addition to the metal parts).
Light. There are better options for emergency lighting, but cooking oil can work in a pinch. Use a third cup of old cooking oil in a jar, some salt, and a cotton ball to keep a room illuminated.
Bug spray. Mix a tablespoon of dish soap and a teaspoon of vegetable oil into one quart of water. This pest spray coats the exoskeletons of bugs and blocks their spiracles (the openings that insects use to breathe).
Suppress dust. Spraying oil on soil causes it to harden as people walk or drive over it.
With all these possible uses, Angie and I have decided to keep this oil rather than just throwing it away.
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