The second-largest refiner in South Korea bought 300,000 barrels of the heavy sour crude for delivery in the second half of February, he said.
The refiner is trying out a small volume of the oil, which has a quality similar to that of Iraq’s Basra Heavy crude, a person familiar with the matter said, speaking on condition of anonymity because he wasn’t authorised speak to media.
About 300,000 barrels of Cold Lake were loaded onto Panamax Selecao on Dec. 13 at Vancouver for delivery to an unspecified destination, trade flows data on Thomson Reuters Eikon showed.
One trading source said the arbitrage window might have briefly opened when the discount between U.S. West Texas Intermediate crude and Brent futures stretched as wide as $7 a barrel last week on a disruption in Forties crude supply.
Heavy crude produced in Canada is trading close to its deepest discount in four years as pipeline constraints pushed western Canadian crude inventories to record highs.
GS Caltex operates a 790,000 barrels per day refinery in Yeosu. The refiner is equally owned by GS Energy Corp, a unit of GS Holdings , and U.S. oil major Chevron Corp .
Another South Korean refiner Hyundai Oilbank Corp has also expressed interest in purchasing Canadian crude.
(Reporting by Jane Chung in SEOUL and Florence Tan in SINGAPORE; Additional reporting by Nia Williams in CALGARY; Editing by Tom Hogue and Kenneth Maxwell)