After you get the oil stains removed, power wash the driveway, let it dry overnight and apply a concrete sealer to it. Purchase the concrete sealer at a concrete supply store. It should be a solvent based film (topical) forming sealer to protect the concrete from car drippings penetrating into the pores.
Hi, I am Mike Day, owner of Day’s Concrete Floors, Inc. in Maine, where I've been working with concrete for 30 years now, and this website is where I can share with you all the knowledge and wisdom I've gained from installing all kinds of decorative concrete, concrete floors, concrete overlays, stained concrete and also fixing cracked or spalled concrete.
There’s a lot to cover, so if you have any questions, contact me!