Any major US soyaoil imports could weaken US prices, Hamburg-based newsletter Oil World said.
Recent pressure on the US soyabean market was partly due to renewed rumours of US soyaoil import purchases, it said.
"An estimated 70,000 to 100,000 tonnes are under negotiation, presumably earmarked for shipment form Argentina in April/May," it said. "But the deals have apparently not been concluded."
Any large soyaoil imports would be a logical consequence of the recently extremely wide prices differentials between US and South American supplies, it said.
"Such imports can break the bullishness in US soyaoil prices," it said. "But at the same time they will take away supplies from other importing countries and could result in firming export prices in Argentina and Brazil."
It added: "The global tightness in soyabeans has recently fuelled soyameal prices more than those of soyaoil."