l Get a bag of good quality oil-absorbent (kitty litter might work, if
it is the clay-based variety; there are other products specifically
for shop cleanup that will work even better) and a quart of mineral spirts.

Cover the oil stain with the absorbent, wait an hour or so, sweep it
up. Then pour about a cup or so of the mineral spirits over the
remaining stain, and scrub it a few minutes with a stiff bristle
brush, broom or a wire brush. Cover it again with fresh absorbent and
let it sit several hours or overnight. When it is swept up the next
time the stain will likely be gone.

I'm usually not the wet blanket, you shouldn't do that guy, but if
there are any open flames (like gas water heaters of heating equipment)
in the OP's basement mineral spirits is pretty flammable off of the
vapors. A basement is usually a pretty non ventilated area.