At the National Commodity and Derivatives Exchange, refined soya oil for delivery in October shed 85 paise, or 0.13 per cent to Rs 659 per 10 kg with an open interest of 19,090 lots.
Similarly, the oil for delivery in November traded lower by 40 paise, or 0.06 per cent to Rs 663.60 per 10 kg in 49,880 lots.
Analysts attributed the slide in refined soya oil futures to offloading of positions by traders due to subdued demand in the physical market against sufficient stocks position.