Saudi Aramco has increased its differentials for selling crude oil to the US by $0.80 a barrel for its official selling price for June.

Aramco also raised June premiums for super and extra light grades to Asian customers, but further discounted Arab medium by $0.40 a barrel, making it $.0.55 a barrel cheaper than the average of Oman and Dubai grades, the Gulf’s two benchmarks according to Bloomberg.

Most of the Gulf’s crude oil is sold to long-term customers usually from the refining sector.