Indonesian authorities have been weighing up for months whether to cut the crude palm oil export levy, which has been at its highest level for five months in a row, hurting demand.
The tariff for export levy begins when prices are at $750 per tonne, with a $20 increase for every $50 rise in CPO.
The benchmark palm oil contract for August delivery on the Bursa Malaysia Derivatives Exchange fell 285 ringgit, or 7.8%, to 3,378 ringgit ($821.30) a tonne, its lowest since Feb. 5.
The benchmark palm oil contract for August delivery on the Bursa Malaysia Derivatives Exchange fell 2.7% to close at 3,917 ringgit ($946.59). It erased some of the 3.4% gain posted on Tuesday.
The Bursa Malaysia was closed on Wednesday for the Vesak Day holiday.
The benchmark palm oil contract for August delivery on the Bursa Malaysia Derivatives Exchange settled 215 ringgit, or 5.07%, higher at 4,457 ringgit ($1,080.48) a tonne, after closing 1.05% lower on Monday.
The benchmark palm oil contract for August delivery on the Bursa Malaysia Derivatives Exchange ended down 45 ringgit, or 1.05%, at 4,240 ringgit ($1,026.88) a tonne.
Malaysian markets were closed last Thursday and Friday after a half-day trade on Wednesday for holidays.
The country imported 701,795 tonnes of palm oil last month, while soyoil imports fell by 21% to 144,020 tonnes, the Solvent Extractors' Association of India (SEA) said in a statement.
Sunflower oil imports dropped 18% to 184,097 tonnes in April after prices more than doubled in a year, it added.
The futures contract was set for a 14.4% rise for the week, its biggest since 2001.
Palm oil is being supported by a rally in the global agricultural market led by Chicago corn and soybean futures, which are trading at multi-year highs.
The benchmark palm oil contract on the Bursa Malaysia Derivatives Exchange finished up 166 ringgit, or 4.1%, to 4,210 ringgit ($1,021.84) a tonne.
"Demand is better, with palm being the cheapest vis-a-vis other competing oils. Thus, we anticipate prices to remain both defensive and firmer," he added.