Fluid filter

An internal combustion engine liquid filter, comprising: a filter housing and housing cover a ring filter element; at least one intermediate piece arranged below the filter housing cover and above the housing; an inlet channel arranged on the housing side, communicating with a crude side of the ring filter element, and an outlet channel arranged on the housing side, communicating with a pure side of the ring filter element; a drainage channel on the housing side, wherein the housing space drains through the drainage channel when removing the filter housing cover; and a closure mechanism arranged in the intermediate piece and the closure mechanism is rotatable about a filter axis, wherein the closure mechanism has a closure element for closing the drainage channel.