Brent rises to $109.53/bbl and USD/CNY at 6.6781 lift landed base oil cost to ¥5,280/t; domestic N350–fuel oil spread widens to ¥1,120/t (¥4,658 → ¥5,778), highest in 3 months. Refinery maintenance concentrated in East China cuts regional base oil output; industry-average开工率 falls to 68% (industry norm). Import substitution pressure surges.