Crude oil again declined after yesterdays upward trend.Oil prices slightly went up in wake of the prediction by Opec about the increase in commoditys demand.However, the market saw downward decline as the investors are cashing out on account of weak market. In Asian markets, light sweet crude oil was traded on $78.30 cents with a decrease of 72 cents, while rate of Brent North Sea crude was declined by 73 cents.