Get a bag of Portland cement from local building
merchandise store, sprinkle handfuls of it over the
stain. Let it set overnight. Should get most of the oil.
Repeat if required,

Have you tried Sodium Hydroxide (caustic soda)? It works on most oil stains.

You can get a hold of Super *Hen*  K-Hen-Mammy aka K-Man.  She'll peck the
stains out of the cement with her Super Beak. Then she'll squat down and
feather it up.

This is not a topic for this group.

One of the best solutions is to get a high pressure washer for concrete.
This may do the job for you. Putting cement powder on to the stained area,
working it in, and then letting it sit over night may help out. Don't get it
wet.

From the 7 year old, another solution that sounds odd, is to oil down the
complete driveway, and then all of it will match.

I found that with oil stains, after a number of months they tend to fade
away. In the fall I get the cars sprayed with mineral oil to protect them
from rusting. When I park them on the street, or in the driveway, they drip
for a number of days. By the time spring comes around, the stains are not
showing.

Where ever you park a car, there is the chance that there will be a few
drops of oil. After an oil change, if there are a few drops that spilled,
and was not spotted to be cleaned, there is a chance that they may end up on
the surface below the car. Sometimes they can take a while to fall.

Apart from getting a car that dosen't leak oil,does anyone have suggestions
for getting oil stains off concrete?

I have tried various things,including bleach(liquid and powder),dishwashing
liquid,even the gunk brand engine degreaser in the spray cans,but the
concrete just soaks that sh.t up. I have even tried combinations of these
but still nothing really works 100% , maybe 50% at best.  There dosent seem
to be anything available that is chemically strong enough to do the job.

Also,I don't expect to just put something on and it will magically
disappear,i realise that a certain amount of scrubbing the floor on hands
and knees is invloved !!

Any methods you have tried that work?

cheers

I'm surprised no-one has suggested the old standby: TSP (trisodium
phosphate). It should be available at any hardware store, sold where
the driveway sealer would be sold.

www.google.com

Enter the search terms:
tsp concrete cleaner

Use the correct material for the job. Just about any good hardware or auto
parts store carries very effective concrete degreasers. Gunk GP is an
oldie and goodie.

Ummm...why? Your driveway is not white laundry, so bleach is not the
correct choice. Your garage floor is not dinnerware, so dishwashing liquid
is wrong. And I'm pretty sure I've never seen an engine made out of
concrete, so engine degreaser's the wrong gookum, too.

Sure there is -- it just apparently never occurred to you to ask for
"driveway degreaser".

Or, y'know, if you're *really* smart, it might occur to use a pushbroom to
do the scrubbing standing up.

Here, this is the stuff you're after:
http://ace.imageg.net/graphics/product_images/pACE2-981751reg.jpg

I haven't tried it myself, but I have been told that oven cleaner such
as Easy Off works very well.

What ever you do to remove the stains you should remove any liquid oil
first. The thing for that is cat litter. Put it on the oil puddle and rub it
in with your shoe sole, then sweep it up. Depending on the amount of oil,
you might have to do it several times. In any case the concrete will still
be stained. Deluted muratic acid applied with a scrub brush will remove the
stain, but it will leave a place that is much lighter than the rest of the
concrete.

As an aside, oil stains sink in 2 or more inches into concrete.

What trick, what device, what starting-hole on Tue, 24 Jan 2006
16:05:17 -0800, canst thou now find out, to hide "me" <me@here.com>
from this open and apparent shame?:

Actually there is something you could simply pour on it & it would go
away. Unfortunately some of the floor will "go away" too.
Hydrofloric acid.
Oh and BTW, it's REALLY, REALLY dangerous.

Kitty litter.

WD-40.

More kitty litter.

Repeat.

A pressure washer will etch out the concrete.  It'll blow away the cement and
leave the surface more rough and make it look different than the remainder
of the non-etched surface.  Some doofus tried this on my GF's swimming
pool deck and it is permanently screwed up.

b.

 I make a poultice of kitty litter and mineral spirits.    I spread
the poultice over the stain and let the mineral spirits evaporate.
The mineral spirits solvent penetrates the concrete,  dissolves most of
the oil,  then migrates back into the kitty litter, carrying the oil
with it, as the solvent evaporates.   The process is a form of
chromatography.

It isn't perfect but it is cheap,  simple and handles most of the
problem.   However, you must deal the fire hazard somehow.   If I use
the technique inside my garage,  I use a fan to blow the fumes out the
open door.   I never use it inside the house.

Brake fluid and transmission fluid are best handled with an alcohol,
acetone or lacquer thinner.   The fire hazard is much greater with
these solvents.

Jason

http://oildri.com

This is what is commonly used in industry to remove oil stains.
Easy to use and get rid of.
Contact them for a dealer in your area.

You can also pressure wash the stain out.

cat litter
pour it on, leave for a few hours, brush it off.
works like a dream.

You don't remove the oil stains, you remove the concrete.  
if your car leaks oil, simply remove and replace the concrete every 6
to 8 weeks, or sooner if you wish.