If you have an asphalt driveway, remember that the asphalt emulsion is basically oil. If the stain is new you might have a chance of getting it out but Older stains become part of the asphalt.
The company I used to work for cleaned up many oil/diesel releases from truck accidents using speedi dry, power sweepers, and brooms. Several times we had companies complain that there was still stains in their parking lots. We cautioned that they most likely would not come out but they still hired us to give it a go. A couple thousand dollars later, after a day of high pressure hot water/steam, surfactant, brushing, and more speedi dry the stains were usually still there.
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