Singapore residual fuel stocks build 4% in September, yet bunker lead times stay tight

Singapore's residual fuel oil inventories climbed to 19.75 million barrels in September, a 770,000-barrel (4%) build over August, even as bunker suppliers warned ship operators that prompt lead times for the two main grades moved in opposite directions.

Enterprise Singapore data shows the city-state's stocks stayed below the 20 million barrel threshold despite a 21% jump in net fuel oil imports. Net imports rose 571,000 barrels month-on-month to 3.28 million barrels, driven by a 544,000-barrel increase in arrivals to 5.12 million barrels and a 26,000-barrel decline in exports to 1.84 million barrels.

Where the barrels came from — and where they went

Brazil and Syria each supplied 11% of Singapore's September fuel oil imports, with Russia accounting for another 8%, according to Vortexa cargo tracking data. On the outbound side, China absorbed 42% of Singapore's fuel oil cargoes, followed by Malaysia at 19% and Bangladesh at 11%.

Middle distillate inventories also expanded, rising 3% (280,000 barrels) to 8.47 million barrels — a smaller but directionally consistent build.

What the bunker market is telling ship operators

The headline stock increase masks continued tightness at the wharf. A Singapore-based bunker source told ENGINE that the market continues to face supply pressure despite "below average demand," as cargo arrival delays linked to the Middle East conflict constrain availability.

For shipowners planning stems, the grade-by-grade picture split sharply:

• VLSFO: recommended lead times around 10–15 days, down from 13–17 days the prior week
• HSFO: advised lead times 10–15 days, up from 9–12 days the week before
• LSMGO: lead times around five days, improving from 5–7 days

Most suppliers keep stock levels deliberately thin, which means even modest demand pulses can swing availability. For container, tanker and bulker operators refuelling in Singapore — the world's largest bunker port by volume — the practical effect is longer planning horizons and greater reliance on advance stems for high-sulfur stems.

Commercial consequences for carriers and forwarders

Higher-sulfur fuel oil remains the pressure point. The widening HSFO lead times, combined with persistent Middle East transit delays, raise the risk of off-spec or short-supply stems for owners whose vessels cannot burn VLSFO without scrubbers. For liners and tanker charterers, that translates into tighter bunker procurement windows at Singapore and a wider premium for prompt delivery.

For shippers, the read-through is largely indirect. Bunker cost pass-through clauses and BAF adjustments tend to widen when Singapore prompt premiums climb, even when total stock levels appear comfortable on paper. Container lines operating on Asia-Europe and trans-Pacific rotations are the most exposed given Singapore's bunkering role on those loops.

Looking ahead, the trajectory hinges on whether Middle East shipping disruptions ease enough to normalize lead times before Q4 demand from the container and dry-bulk shoulder season peaks. If current cargo delays persist, HSFO and VLSFO prompt premiums at Singapore will likely widen further into November, regardless of how comfortable total stock levels read on paper.