West Texas crude fell to about US$100.30 and Brent to about US$103.87 per barrel on 18 Sep 2026, both down for four straight sessions. Drivers: repairs to Saudi Arabia's East-West pipeline, and Saudi Aramco reportedly raising exports from Ras Tanura. Attacks in the region and uncertainty over Strait of Hormuz shipping remain, so prices could swing back. For a Thai SME, fuel and transport costs are still very high; do not assume relief yet. Review fuel surcharges and delivery budgets, and avoid locking in higher costs on the basis of this one-week dip.