Start by heading to the pet shop and buying some cat litter. Sprinkle the cat litter onto the oil stain, and when the granules turn dark, sweep them up and apply a second sprinkling.
This time use a soft brick to grind the cat litter into the oil. You don't have to bear down too hard, just maintain a steady circular motion to achieve the best results. When the litter is reduced to a fine powder and remains light in colour, you will have removed all but a final residue that clings to the voids in the surface of the paving.
This light-coloured residue will lighten further the longer it is exposed to the sun. More stubborn oil spots might require a commercial concrete cleaner or degreaser.