Brent settled at $96.37 a barrel, up 0.57% on the day, while WTI closed at $88.99, up 0.28%. Both benchmarks barely moved, yet the spread reopened from the $5.9 area back to $7.38, back near the upper band of its third-quarter range.

The number that actually moved the book was the exchange rate. USD/CNY slipped from around 6.668 to 6.6726, and on the standard crude formula (Brent times FX times 7.33) the yuan-denominated landed cost works out to roughly 4,713 yuan per tonne, higher than last week's low despite flat crude. For refiners and traders settling in yuan, the barrel did not get cheaper; the landed end got more expensive.

A wider spread plus a weaker yuan reshuffles the short-haul light-sweet ranking. Grades like ESPO, Dubai and Oman, normally pressed against long-haul US Gulf cargoes on tight differentials and low freight, now see their edge blunted as the WTI landed cost is diluted by the rate move. Desks have to strip each cargo into differential, freight and hedge cost before committing.

The operational read this week is not crude is cheap, lock it in, but the landed cost quietly lost ground to the currency leg. Price the FX leg and the differential leg separately before any fix, and do not let two flat benchmarks hide the move.