Mexican state-run oil company Pemex expects to begin testing light crudes as soon as July for possible import, looking to boost margins at its domestic refineries, its chief executive said on Tuesday. Pemex has for decades exported crude oil but has hardly ever imported the commodity, preferring to process domestic crudes at its six refineries in Mexico. Pemex Chief Executive Officer Carlos Trevino said the company would likely seek imports resembling its proprietary Isthmus grade of light crude, the production of which has been declining in Mexico. “We are going to start testing maybe in the third quarter,” Trevino told Reuters on the sidelines of a conference in Seattle. “We are going to be looking for the cheaper mix … We may be using the (West Texas Intermediate), something from the U.S., he said. “What I personally expect is that we can find something very similar […]