Bitumen closed at ¥5,013/t, down 3.5% on the day, flipping its premium over fuel oil into a discount: fuel oil held at ¥4,434/t (+0.36%), so the fuel oil–bitumen spread inverted to -¥579/t.

The bitumen drop tracks road construction entering the off-season and slower outflow from social inventories. Refineries are not defending price; instead they push residue yield toward very-low-sulfur fuel oil (VLSFO), where blending margins are steadier than bitumen and vessel operators keep replenishing stocks under the IMO 2020 sulfur cap.

For transshipment desks the read is direct: stable fuel oil and softer bitumen mean the destination of the same barrel of residue has changed. Warehouse receipts tagged to bitumen need a rescheduled delivery; those tagged to VLSFO blending actually find spot uptake.

This week, watch VLSFO blending levels and the Singapore 0.5% paper, not road demand. A -¥579/t inversion is a by-product of yield switching, not a bottom-fishing signal.