ISIL is selling oil on the black market for less than the market price. At about $40 per barrel it affects the overall price in time. Nobody seems to know what currency (if any) they are trading it for.

http://www.theburningplatform.com/2014/09/12/thank-isis-for-lower-gas-prices/

http://www.businessweek.com/articles/2014-06-20/iraqs-isil-jihadists-want-an-oil-state-of-their-own-too

If they are not selling the oil in US dollars that is reason enough for the powers that be to want to destroy ISIL. Others that did this are dead. Saddam Hussein and Gaddafi committed this heresy.

IS does not control enough oil production to significantly affect global prices, regardless of the price at which they are dumping the oil they may or may not have.

Originally posted by KazetNagorra
IS does not control enough oil production to significantly affect global prices, regardless of the price at which they are dumping the oil they may or may not have.

Originally posted by Metal Brain
100 million per month isn't bad.

http://abcnews.go.com/International/isis-makes-million-day-selling-oil-analysts/story?id=24814359

Originally posted by JS357
They are as good as done. The West's victory will come by turning them into capitalists.