Oil pan

An oil pan comprising a lower shell intended to contain oil for lubricating an engine, wherein an oil flow, called sucked oil flow, is sucked by a suction tube for supplying a lubrication circuit and an oil flow, called returning oil flow, falls into the oil pan, wherein it comprises an anti-emulsion plate disposed in the oil pan and orientation means allowing to orient at least a portion of the returning oil flow to an area located at a mouthpiece of the suction tube for a transitional period during which the oil has a temperature lower than an optimum operating temperature, wherein the orientation means comprise a bypass tube opening at a first end into an opening of the anti-emulsion plate and at a second end into the mouthpiece of the suction tube, and wherein the orientation means comprise a bimetal shutter positioned in the opening of the anti-emulsion plate, the bimetal shutter being movable between an open position in which the oil can flow into the opening and a closed position in which the bimetal shutter closes off the opening, the bimetal shutter being adapted to switch to the closed position when the oil reaches or exceeds its optimum temperature.