SINGAPORE—The volume of U.S. crude oil arriving in Asia is expected to hit a new high in July as Asian refiners sought arbitrage supplies to replace Middle Eastern crude after prices for Gulf grades rose, traders said on May 16.

U.S. crude arriving in Asia hit an all-time high of close to 25 million barrels in May with cargoes discharging in China, South Korea, Singapore, India and Malaysia, according to trade flows data on Eikon.

The volume dips to about 19 million barrels in June but is set to rebound again in July after U.S. crude futures slipped to the widest discount in three years against Brent this week, according to traders and Eikon data.

The drop in U.S. crude prices coincides with rising values for Middle East oil in Asia and has opened the arbitrage window, traders said.

Close to 10 supertankers, each carrying 2 million barrels of crude, have been lined up to load oil in the U.S. Gulf Coast for Asia, two of the traders said. These are expected to arrive in July, they said.

“WTI Midland is coming across,” a third trader said, adding that refiners such as JXTG Nippon, SK Energy and Cosmo Oil have bought U.S. crude.

Last week, Indian state-refiner Indian Oil Corp. (IOC) bought 3 million barrels of U.S. crude for loading in June.

Some of the popular U.S. grades in Asia such as WTI Midland, Mars and Southern Green Canyon can now compete with Middle East grades such as Murban and Oman in Asia, traders said.

WTI Midland crude delivered to North Asia are priced at a premium of close to $5 a barrel to Dubai quotes, comparable with Abu Dhabi’s Murban, while Mars crude cargoes are being offered at $1.50 a barrel above Dubai quotes, competitive with Oman, they said.

Light, sweet WTI Midland comes from the Permian basin, a region which was a key contributor to record shale oil production in June. The grade’s cash discount hit the lowest in four years earlier this month.

“The value for Midland is better than Murban for cargoes landing in China,” a trader with a Chinese company said, adding that the influx of U.S. oil supplies may put some downward pressure on Middle East crude prices.

The Middle East crude market has been underpinned by supply cuts by OPEC, peak summer demand and as fears of disruption in Iranian supplies after the United States withdrew from a global nuclear pact fueled sentiment.