Question

Why is a sewing machine often oiled?

Answer 1

Just like in any other machines that contain a lot of movable parts, sewing machines also feature same kind of configuration.

When different parts glide against each other then it leads to friction.

So, to keep the level of friction as low as possible, oil is used.

Answer 2

The sewing machine is often oiled because the oil acts as a lubricant and reduces the friction between the machine parts allowing them to move freely without any disturbance.