no
Yes, you can. Olive oil will affect the flavor of the muffins, so would be most successful in savory muffins - corn, cheese or spicy muffins with sage and thyme, or chopped onion and celery. For sweet muffins, I recommend canola oil because it has a neutral taste. But olive oil works for sweet muffins, too. It's used in several types of Italian cakes.
It depends on what type of muffins you're baking. Extra virgin olive oil is the most flavorful of olive oils, being the product of the first pressing of the olives; therefore, it has a very distinct, olive-like flavor. So, if you're making sweet muffins, it would be better to use canola or vegetable oil. Those oils don't really have much flavor, and won't affect the taste. But, if you're making muffins that are heartier (using bran or granola or nuts, and very little, if any, sugar/fruit), then olive oil may be an interesting flavor to add.
you use an egg to make them stick
No. but you could try chutney or jam. If you mean the other way round, you can use applesauce to replace oil when making muffins and cakes to reduce the fat content.
eggs make the muffins coagulate
Conventional ovens and some toaster ovens can be used to bake muffins. You cannot use a microwave oven to bake regular muffins.
When making a roux, especially a dark roux it is best to use oil instead of butter.
no
No, you can not use engine oil in place of two cycle oil.
Many oils can be used for making french fries. While most places use vegetable oil or canola oil, krill oil can be used as well. You can ask your favorite restaurant what type of oil they use.
*****The uses of oil are 1=we use oil for our making machine for our honoritical for our food. 2=it give us many goods for making.