Saudi Arabia is expected to raise crude prices to Asia in May, with the official selling price (OSP) for flagship Arab Light crude rising by $5 a barrel on average to reach nearly $10 a barrel above Oman/Dubai quotes, the grade’s highest premium ever. However, spot premiums have halved from peaks over the last week in muted trade, prompting some buyers to call for smaller hikes in Saudi oil prices. Saudi Aramco may also reduce price hikes for Saudi medium and heavy grades as Russian Urals crude is still heading into India, one respondent said. State oil giant Saudi Aramco sets its crude prices based on recommendations from customers and after calculating the change in the value of its oil over the past month, based on yields and product prices.