US API Crude Oil Stock Change (Aug/07) 9.072 vs. Exp. -0.50 (Prev. 2.69)

A surprise crude build of this size against a consensus looking for a modest draw sits well outside the usual forecast distribution for the weekly API survey, and builds on an already-positive prior print, which makes it harder to dismiss as noise. The API is a voluntary survey and diverges from the official EIA figures with some regularity, so the established pattern is that the API moves WTI at the margin in the after-hours but the confirmation or fade comes with the government data the following morning; persistent multi-week divergences between the two have historically been resolved in favour of the EIA. The detail worth isolating is composition: a crude build accompanied by product draws, particularly gasoline, reads very differently from an across-the-board stock accumulation, since the former points to refinery runs and demand while the latter points to oversupply. The usual sequence from here is that attention shifts to the EIA report, its implied demand figures, and the Cushing storage line as the cleaner signal at the delivery hub. Prints of this magnitude that are corroborated by the official data have tended to weigh on prompt spreads and weaken the front of the curve; prints that the EIA contradicts have tended to be retraced within the session.