US Energy Secretary Chris Wright has contacted executives at several major US refiners to gauge support for voluntarily restricting diesel exports, Reuters reports, according to three people familiar with the discussions

The distinction that matters is between jawboning and mandate: voluntary requests have tended to precede, and sometimes substitute for, formal curbs, and compliance without a legal mechanism is inherently uneven across the refiner set. The actors here are the relevant channel, the administration reaching directly to Gulf Coast refiners indicates the concern is the domestic diesel balance and the Atlantic Basin export flow that US refiners normally supply. The follow-ons that have mattered in comparable episodes are whether the request formalises, whether refiners comply, and the state of domestic distillate inventories heading into the request. The mechanism to watch is the US export plug and the freight-adjusted price of Atlantic Basin diesel, since removing US barrels from the export pool historically tightens the European import market while softening the US domestic differential.