Mexico's state oil company wants to import about 100,000 barrels of light U.S. crude a day to mix with this country's heavier oil as a way to improve refinery processes.
State-owned Pemex said Thursday that the deal was proposed last year and would simply trade heavier Mexican crude for light U.S. oil.
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While the deal has not gone through, it is raising hackles in Mexico, which is a country sensitive about its own falling oil production. Mexico has been a crude exporter for decades, but officials have warned it will become a net importer if it doesn't explore new reserves.
Mexico exported an average of about 803,000 barrels of oil a day to the United States in 2014.