Reuters – Mexican state oil firm Pemex expects imminent approval from the U.S. Commerce Department to allow it to swap up to 100,000 barrels of heavy crude for a similar amount of lighter U.S. oil, what could be the latest milestone toward loosening the four-decades old ban on exporting U.S. oil.

http://www.reuters.com/article/2015/03/25/usa-mexico-crude-idUSL2N0WL2SW20150325