Brent rose to about $90.87 and West Texas to about $84.50 per barrel on 17 Aug 2026, up $2.35 and $2.10, as the US said its naval blockade of Iran continues with no clear end date. Tensions also rose in the Middle East, with Houthi missile claims in the Red Sea. China's crude refining edged up in July, the first rise since the conflict began. For a Thai SME, expect diesel and fuel-linked costs to stay volatile; review transport and energy budgets and fuel surcharges this quarter rather than assuming relief soon.