A near-million-kilolitre weekly draw. In the week to 24 October, Japanese commercial crude stocks fell to 10,332,499 kl, a single-week draw of 962,304 kl (-8.5%). The magnitude deserves unpacking: the draw equals roughly three to four days of national refinery throughput absorbed from inventory, and it occurred without any rise in run rates — refiners did not 'burn more'; cargoes 'arrived less'. Cargo-arrival timing mismatched against refinery ramp schedules is the most common mechanical driver of such swings.

The full two-week picture. Extend the timeline by one week: stocks had just rebuilt by 652,200 kl to 11,294,800 kl in the week to 17 October (PAJ, released 21 October), only to give back 962,300 kl this week — a net two-week change of roughly -310,000 kl. This is consistent with our 29 October read: autumn-turnaround inventory swings are a combination of maintenance cuts and cargo-schedule mismatches, not collapsing end demand. The genuine observation is that the amplitude is widening: weekly swings of ±650,000–960,000 kl mean the stability of the inventory buffer is deteriorating.

Two old threads persist: run rates and visibility. On the basis cited by Jin10, utilisation held at 83.0% on operable capacity (BPSD) and 76.4% on design capacity (BPCD) — the 6.6-point structural wedge between callable and nameplate capacity has not closed, and what Japanese refiners can actually commit remains below nameplate. Meanwhile PAJ has suspended its weekly product-stock breakdown (gasoline, jet, kerosene, gasoil), so high-frequency product-side buffer readings remain unavailable and outside observers must reconcile with monthly statistics after the fact. With CFR Japan naphtha at USD 1,082.25/t on 2 November, every 10,000 kl of incremental feedstock tightening transmits directly into spot availability of chemicals and products.

Implications for SNSUC. Spot availability of Japan-origin barrels should still be handled 'volume before price'. First, with the turnaround season unfinished and inventory swings widening, ex-Japanese-refinery naphtha and base-oil parcels can tighten at any time — confirm volume before negotiating price. Second, set offer validity in weeks and require counterparties to pin down laycans, avoiding renegotiation caused by arrival mismatches. Third, our addressable categories are LNG/LPG, SN150/SN500 base oils, paraffin and lubricants; hazardous chemicals are excluded without exception, and first-time counterparties always require third-party inspection (SGS/BV/Intertek grade) and a closed document loop. Disclaimer: this is market observation based on public data and does not constitute investment advice.