At the National Commodity and Derivatives Exchange, refined soya oil for August delivery eased by Rs 3.60, or 0.56 per cent, to Rs 643.40 per 10 kg with an open interest of 53,960 lots.
Likewise, the oil for delivery in July lost Rs 3.55, or 0.55 per cent, to Rs 640 per 10 kg in 16,590 lots.
Analysts said cutting down of positions by traders following fall in demand in the spot market against adequate stocks position on increased supplies from producing regions mainly weighed on refined soya oil prices at futures trade.