Brent crude and West Texas Intermediate front-month contracts slipped as Gulf states planned diplomatic talks.
The decline pushed U.S. oil prices below $100 a barrel, a notable shift for energy markets.
Diesel prices moved in the opposite direction, climbing past $6 a gallon to set a new record.
That split highlights pressure on refined fuels even as crude benchmarks retreat.
Diplomatic talks among Gulf states raised the possibility of supply changes, easing crude prices.
Diesel’s record reflects tight inventories and strong demand for transport and industrial fuel.
The divergence leaves traders watching both crude and refined products for the next market direction.
