General view of Saudi Aramco’s Ras Tanura oil refinery and oil terminal in Saudi Arabia May 21, 2018. REUTERS/Ahmed Jadallah Top oil exporter Saudi Arabia is expected to slightly increase its July official selling prices (OSPs) of light crude for Asia, as margin weakness and demand uncertainty cap the upside despite stronger crude benchmarks, a Reuters survey showed. Sources at five Asian refiners on average expected the July OSP for Saudi flagship grade Arab Light to rise by 10 cents a barrel, with their forecasts ranging between no change to an increase of up to 20 cents. The expected adjustment for Arab Light tracked the price strength in Middle East crude oil benchmarks Cash Dubai and DME Oman, which in May saw their premiums to Dubai swaps up by 14 cents and 8 cents respectively from April. But weakness in Asia’s refining margins, also known as cracks, in particular […]