A supertanker is bringing millions of gallons of Asian-made diesel to Europe, threatening to strain the continent’s already brimming storage depots even further. The Alice, able to ship about 80 million gallons, was booked to haul diesel on what traders refer to as an arbitrage route, Euronav NV, the carrier’s owner, said in January. That same ship is signaling Antwerp as its destination, tracking data show. The Belgian port is part of the continent’s key oil-trading hub. “Europe has become a dumping ground for diesel,” Ehsan Ul-Haq, senior oil market analyst at KBC Energy Economics in Walton-on-Thames in England, said by phone. “We may run out of onshore capacity and these ships may become offshore storage tankers” if there are more charters of this kind. Oil refineries ramped up processing of crude into products such as diesel last year because their single-biggest cost — crude — plunged in price. […]