Difficult

What goes with a car, comes with a car, is no use to a car but a car cannot move without it?

related riddles

Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.

What has four wings but cannot fly and uses the wind but does not know why?

What word is a plural, but when you add an "S" to the end, it becomes singular?