Saudi Aramco, the state oil company of the world's largest crude exporter, has raised the premium it charges Asian customers for its main oil grade — Arab Light — to $19.50 above the Oman-Dubai benchmark for May deliveries. In 26 years of recorded data, that premium has never crossed $10. European customers are being asked to pay even more: $24 to $30 above the Brent benchmark, which is itself trading around $108 a barrel.
