At the National Commodity and Derivatives Exchange, refined soya oil for delivery in September fell by Rs 5.75, or 0.88 per cent to Rs 650.85 per 10 kg with an open interest of 55,590 lots.
Likewise, the oil for delivery in August contracts shed Rs 4.20, or 0.65 per cent to Rs 639.10 per 10 kg in 17,820 lots.
Analysts said offloading of positions by traders due to easing demand in the spot market against adequate stocks position mainly weighed on refined soya oil prices at futures trade.