UPDATE 3-S.Korea's GS Caltex makes first Mexican crude purchase in 25 yrs
* First Mexican crude purchase since 1990 -customs data
* GS Caltex looks to procure cheap crude as prices remain weak
* Similar purchases likely if cheap spot available -spokesman
* Another Mexican crude on the way for another Asian refiner -Reuters data (Adds Pemex shipping 5 million barrels to South Korea recently)
By Meeyoung Cho
SEOUL, March 9 (Reuters) - South Korea's GS Caltex Corp has bought Mexican crude for the first time in 25 years to take advantage of low prices to make cheap spot purchases, a spokesman said on Monday.
GS Caltex, the country's second-biggest refiner, bought 1 million barrels of crude from Mexican state oil company Pemex, which arrived late on Sunday, he said.
Separately, Pemex said between January and April 2015, it will have exported about 5 million barrels of crude to South Korea, with about 80 percent of it going to Hyundai Oilbank Co Ltd and the rest to GS Caltex.
The crude is being sent in 1 million-barrel shipments, 80 percent of it Isthmus crude and 20 percent Maya crude, Pemex said. Continuación...