A gear unit having a cooling arrangement and a fan, wherein the fan is connected non-rotatably to a first shaft of the gear unit, namely to an input shaft of the gear unit, wherein the cooling arrangement comprises a cooler unit, namely cooler arrangement, wherein the cooler unit comprises at least one cooler, wherein an air stream conveyed by the fan flows through the cooler, wherein an oil stream conveyed by a pump flows through the cooler, wherein the cooler comprises a first region through which air flows, and comprises a second region through which oil flows, characterised in that the first region comprises an air cooling part and wherein the second region comprises an oil cooling part and wherein the cooler is formed as a stack of cooling parts, wherein the first region comprises a first corrugated sheet, wherein the second region comprises a second corrugated sheet, wherein the direction of corrugation of the first corrugated sheet is perpendicular to the direction of corrugation of the second corrugated sheet, wherein two covering parts spaced apart from each other perpendicularly to the direction of corrugation and perpendicularly to the direction of flow of the air flow flowing through the first region are arranged in the first region, wherein the cooler comprises a region through which air flows between the first and the further region through which oil flows, characterised in that two covering parts spaced apart from each other perpendicularly to the direction of corrugation and perpendicularly to the direction of flow of the oil stream flowing through the second region are arranged in the second region, and in that the first corrugated sheet in the vertical stack direction is arranged between two third covering parts which separate an air cooling part and an oil cooling part in each case from each other or form an upper or lower closure of the stack of cooling parts. wherein the fan is connected non-rotatably to a first shaft of the gear unit, namely to an input shaft of the gear unit, wherein the cooling arrangement comprises a cooler unit, namely cooler arrangement, wherein the cooler unit comprises at least one cooler, wherein an air stream conveyed by the fan flows through the cooler, wherein an oil stream conveyed by a pump flows through the cooler, wherein the cooler comprises a first region through which air flows, and comprises a second region through which oil flows, characterised in that the first region comprises an air cooling part and wherein the second region comprises an oil cooling part and wherein the cooler is formed as a stack of cooling parts, wherein the first region comprises a first corrugated sheet, wherein the second region comprises a second corrugated sheet, wherein the direction of corrugation of the first corrugated sheet is perpendicular to the direction of corrugation of the second corrugated sheet, wherein two covering parts spaced apart from each other perpendicularly to the direction of corrugation and perpendicularly to the direction of flow of the air flow flowing through the first region are arranged in the first region, wherein the cooler comprises a region through which air flows between the first and the further region through which oil flows, characterised in that two covering parts spaced apart from each other perpendicularly to the direction of corrugation and perpendicularly to the direction of flow of the oil stream flowing through the second region are arranged in the second region, and in that the first corrugated sheet in the vertical stack direction is arranged between two third covering parts which separate an air cooling part and an oil cooling part in each case from each other or form an upper or lower closure of the stack of cooling parts.