A leaking car, a failed hydraulic line, a truck that sat for a weekend. However the oil got there, one thing decides most of the outcome: how long it sits.
Concrete drinks
Concrete and pavers are porous, and petroleum keeps sinking until it is treated. A stain is not sitting on the driveway so much as moving into it, slowly, every warm day.
Fresh versus old, honestly
A fresh spill, treated soon, can lift almost completely. An old stain that has had seasons to travel can usually be drawn down to a shadow, and we will tell you which one you are looking at before we start, not after. The chemistry is good, but it is not a time machine, and we would rather you hear that from us up front.
How the work goes
Degreaser matched to the stain does the drawing, then the rotary surface cleaner runs the slab in even passes, so the treated spot blends back into a uniformly clean surface instead of leaving a bright halo on a gray driveway. Driveways, garage floors, aprons, and parking lots all get the same treatment.
If something is leaking or just leaked, snap a photo of the stain, tell us roughly when it happened, and you get an honest read on how much of it is coming out.