At the National Commodity and Derivatives Exchange, refined soya oil for delivery in October moved down by Rs 5.20, or 0.87 per cent, to Rs 593.70 per 10 kg with an open interest of 31,005 lots.
Similarly, the oil for delivery in November edged lower by Rs 4.25, or 0.73 per cent, to Rs 579.70 per 10 kg in 1,17,415 lots.
Analysts said offloading of positions by speculators, driven by low demand in the spot market against adequate stocks position, mainly influenced refined soya oil prices at futures trade.