Did you try something simple like scrubbing with a brush and hot soapy water or a detergent of some sort? I'm no expert, so it's just a thought. How frustrating for you! I don't think heating it with a blow-torch would resolve the issue, though, as it's surely more likely to just bake the oils into the stone.

take a look at this recent discussion - did you try a poultice?
https://www.gardenweb.com/discussions/5258769/granite-sealing?n=2

I have a granite counter outside, around our BBQ grill. The area gets stained with marinade and oils and then the stains gets "baked" by the CA sun as the counters face west. Every few months I get out my Lysol kitchen cleaner and 99% of the stains come up. I'll also use Clorox cleaner with bleach, which I leave on for about 10 minutes, scrub and rinse. I've never babied any granite I have owned.

If you are certain it is an oil mark, apply a citrus “degreaser” cleaning product, leave puddle over the oil mark for 10-15 minutes, wipe away, then repeat/reapply. After 5 or 6 cycles, I have seen many oil marks removed.

blow torch sounds like a really bad idea... you won’t be able to “evaporate away” the oil, and charring or burning the oil that is now in the stone pores will not be less noticeable.

Do not torch it. Bad idea.

Agreed about not taking a torch to the granite. In fact granite can have a surface treatment called "flamed", which uses controlled heating and cooling to cause chips to spall (flake off), leaving a textured, dimpled surface. So, you could make a small problem worse with the torch.

As to the stain itself, I had a somewhat similar issue, one that I can now regard as amusing since I was able to solve it in the end. Here's the story:

One evening I was cooking, and my girlfriend was helping with the food prep. She went to the dining room table to sit down while she was grating some cheese. It was winter and we had the rather newly installed gas fireplace going in the living room, right by the dining room.

Next day I noticed what appeared to be a small, irregularly shaped grease stain, about the size of a nickel, on the French limestone hearth. Then to my dismay I several more stains of the same size and shape on the hearth. Then I noticed a small blob of rubbery material, which felt greasy. I puzzled over it for a bit then it dawned on me. Evidently while my g/f was grating the cheese, a bit fell on the floor. Then one of our cats discovered the fallen cheese bits, and she must have thought it was a great toy. She played with it until it landed on--you guessed it--the fireplace hearth, which was nice and toasty from that evening's fire. The warmth melted the cheese into a little blob, which our cat then batted around a few more times, thus ensuring maximum cheese grease stainage on the hearth!

My first attempts to remove the stains involved applying a baking soda paste to the stain, letting it sit 24 hours or more while covered with plastic. Didn't help in the least. I tried a few more times but the stains were stubborn. I got an estimate from a firm that does stone repair, but they wanted to grind the entire hearth, said that the process required wet sanding, would be messy, and would cost something like $350. No way was I going to do that.

Finally one day I found a commercial product in a local hardware store (Orchard Supply here in the SF Bay Area). It was a poultice designed to remove grease stains from stone and concrete. Can't remember the brand, but I gave it a try. It smelled unpleasant, but it worked like a charm. Got all the stains removed as if they were never there.

BTW I was sure that the contractor who had installed the fireplace had sealed the hearth, so I was surprised that it stained so easily. Maybe he didn't apply much sealer, or maybe he forgot and I never realized. I've sealed it since our "cheese blob" episode, so hopefully will never have that problem again!

If I can find the name of the product I used, I'll post it here. But probably similar to the product you've already ordered. Hopefully it will do the trick for you.

If that doesn't work, I had luck removing oil from our quartzite countertops with a poultice of acetone and baking soda. It took several applications, but eventually the spots disappeared. Keep trying and good luck.

That should work. If it doesn't try a poultice of plaster of paris and acetone. Cover with plastic wrap with blue tape around it until it's dry. Cover at least an inch around larger than the stain. When it's dry, the stain should be better, if not completely gone. If it's working, do it again until resolved. Found this answer here at Houzz.

Our granite was sealed when it was installed, but we found that it stained easily. We resealed with Tenax Pro Seal after pulling the stain out. We haven't had a problem since.

I have had excellent results using a spray bottle of alcohol and water. Spray heavily leave for a few minutes the wipe away. Keep doing it till it's gone. You can use straight alcohol too.

Just be very very careful with using acetone or the grease stain will be the least of your worries...............

I would recommend MORE - it has a 20 year stain warranty attached.

Do you remember what the dupont product was called? I just found this post, dealing with the same problem