Hello gktweets,
Cleaning oil stains off of your driveway will require the right "products". However, if the oil stains are a heavy buildup then you will definately need to steamclean them off first.
What you will need to do is apply a sodium hydroxide based degreasing product (basically most types of degreasers) to the oil stains and let the product sit on the stains for a few days allowing for the degreaser to completely dry.
Then you will want to use a "hot" water pressure washer to steamclean the oil stains off. If you do not have a "hot" pressure washer then a cold water unit will work too just not as effectively.
If you do not have access to a pressure washer at all you should re-coat the oil stains with your degreasing product then scrub with a broom and rinse with a garden hose simultaneously.
After your driveway is completey dry and the oil stains are still minimally present you can apply a dry product known as Bio-Dry. They have videos posted up on you tube as how to purchase and apply the product.
This product will go to work on the leftover stain and will work "over-time" as far as lifting the stain out of your driveway.
You can see before and after pictures here at this site:
http://www.DrivewaySteamCleaning.com
Feel free to leave any comments on the site as well, they are much appreciated.
Hope this information helps you.
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