Can you use cooking oil as motor oil?

If you want to cook your engine it will work well if you want it to last a long time use good engine oil. And save the cooking oil for cooking. If you are stuck with a choice of no oil or cooking oil use the cooking oil it will be better than nothing but so would butter. read more

Of course used motor oil is much worse. It has metal particle plus all sorts of contaminants from the burned fuel. So no, you can't cook food in motor oil and eat it. And to make it even worse, it is expensive, usually about $10 a liter. Buy olive oil instead, it is cheaper and tastes good. read more