Absorb fresh oil with cat litter, baking soda, sawdust, or commercial absorbent
Let the absorbent sit for several hours or overnight
Sweep up and dispose of the absorbent
Apply a degreaser, dish soap, or concrete cleaner to the stain
Scrub the area with a stiff-bristle brush
Rinse with hot water
Repeat the degreaser and scrubbing if needed
For stubborn stains, use a paste of baking soda and water or a poultice cleaner
Scrub again and rinse thoroughly
Use a pressure washer if appropriate for the concrete surface
Seal the concrete after cleaning to help prevent future stains