At the National Commodity and Derivatives Exchange, refined soya oil for delivery in October fell by Rs 2.55, or 0.38 per cent to Rs 667.35 per 10 kg with an open interest of 45,280 lots.
Similarly, the oil for delivery in September shed Rs 2.45, or 0.37 per cent to Rs 659.50 per 10 kg in 21,380 lots.
Analysts said trimming of positions by traders due to fall in demand in spot market against sufficient stocks position, mainly kept refined soya oil prices lower at futures trade.