Ölabscheideeinsatz and crankcase oil pan unit of an internal combustion engine

An oil separation insert (10) for returning oil present in a crankcase (36) of an internal combustion engine into an oil pan (38) that can be arranged on a lower opening (34) of the crankcase (36), the oil separation insert (10) being provided with a seal for sealing the oil pan ( 38) against the crankcase (36) circumferential sealing element (14) is provided or providable, wherein the sealing element (14) on the outer circumferential edge region (12) of the Olabscheideeinsatzes (10) is provided and in the lower opening (34) inserted Olabscheideeinsatz (10) in the region between the crankcase (36) and the oil pan (38) on the one hand to the crankcase (36) and the other on the oil pan (38) is applied, characterized in that the oil separation insert (10) only a portion of the cross-sectional area of the Covering the lower opening and a down to a portion of the edge region extending cutout is provided, wherein the edge region (12) there from a Fre Isparung (16) surrounding dimensionally stable web portion (18) for receiving the sealing element (14) is formed.