Operating fluid reservoir having a venting and/or air admission valve, wherein the operating fluid reservoir has the following features: - the venting and/or air admission valve comprises a hollow valve housing fastened in the interior of the operating fluid reservoir; - a valve housing interior is in fluid communication with a vent line via a vent opening; - the valve housing interior is in fluid communication with the interior of the operating fluid reservoir via at least one ventilation opening; - the venting and/or air admission valve comprises a valve body arranged in the valve housing interior; - in the installed position of the operating fluid reservoir, the valve body is at a distance from the vent opening when an operating fluid level within the operating fluid reservoir is below a shutoff level, with the result that the valve body is in an open position and the valve housing interior and the vent line are in fluid communication; and - in the installed position of the operating fluid reservoir, the valve body is subject to a lift from the operating fluid in the valve housing interior such that the valve body is in a closed position and closes the vent opening when an operating fluid level within the operating fluid reservoir is above the shutoff level, with the result that the valve housing interior and the vent line are not in fluid communication via the vent opening; - the valve housing is formed integrally with an operating fluid reservoir wall; - the vent opening is embodied as a through opening through the operating fluid reservoir wall; - the valve body can be introduced into the valve housing interior via an introduction opening in the valve housing, characterized by the following features: - the valve body comprises a holding device (23; 14, 24), by means of which the valve body is held movably in the valve housing; - the holding device comprises a latching device, which can be passed through the vent opening into the vent line from the valve housing interior in a process involving elastic deformation of the latching device; and - the latching device situated in the vent opening engages behind the operating fluid reservoir wall surrounding the vent opening. - the venting and/or air admission valve comprises a hollow valve housing fastened in the interior of the operating fluid reservoir; - a valve housing interior is in fluid communication with a vent line via a vent opening; - the valve housing interior is in fluid communication with the interior of the operating fluid reservoir via at least one ventilation opening; - the venting and/or air admission valve comprises a valve body arranged in the valve housing interior; - in the installed position of the operating fluid reservoir, the valve body is at a distance from the vent opening when an operating fluid level within the operating fluid reservoir is below a shutoff level, with the result that the valve body is in an open position and the valve housing interior and the vent line are in fluid communication; and - in the installed position of the operating fluid reservoir, the valve body is subject to a lift from the operating fluid in the valve housing interior such that the valve body is in a closed position and closes the vent opening when an operating fluid level within the operating fluid reservoir is above the shutoff level, with the result that the valve housing interior and the vent line are not in fluid communication via the vent opening; - the valve housing is formed integrally with an operating fluid reservoir wall; - the vent opening is embodied as a through opening through the operating fluid reservoir wall; - the valve body can be introduced into the valve housing interior via an introduction opening in the valve housing, - the valve body comprises a holding device (23; 14, 24), by means of which the valve body is held movably in the valve housing; - the holding device comprises a latching device, which can be passed through the vent opening into the vent line from the valve housing interior in a process involving elastic deformation of the latching device; and - the latching device situated in the vent opening engages behind the operating fluid reservoir wall surrounding the vent opening.