Oil prices dipped again on Tuesday as traders braced for lower refinery consumption after the U.S. summer, while Asia’s weakening economies and high global production stoked concerns about oversupply. Both crude oil benchmarks are now almost a third below their last peak in May, with data showing speculators have taken huge bets on further falls. “Fundamentals suggest downside risks still remain in key markets – particularly iron ore and crude oil – in the months ahead,” ANZ bank said on Tuesday, expecting U.S. stockpiles to rise in coming months as refiners reduce operations for maintenance.