Filter device, in particular an oil filter for cleaning lubricating oil for the internal combustion engines of motor vehicles, - with a filter housing cover delimiting a receiving chamber, in which filter housing cover a ring filter element is arranged, - with a housing, in which a mandrel is arranged centrally and onto which the filter housing cover is screwed, - with at least one intermediate piece, which with the filter housing cover screwed onto the housing, is arranged between the filter housing cover and housing, - with a housing-side inlet channel, which communicates with a dirty side of the ring filter element, and a housing-side outlet channel, which communicates with a clean side of the ring filter element, - with a housing-side idling channel, through which the receiving chamber can be emptied on removing the filter housing cover, - wherein the intermediate piece comprises a cap and a separate closure device which is in the form of a plate, - wherein the cap is securely connected to the filter housing cover, - wherein the plate is arranged in the cap rotatably about the filter axis and comprises a closure element by means of which the idling channel can be closed, - wherein on an outer edge of the plate at least one locking element is provided which engages into a fitting counter locking element on the inner side of the cap, - wherein between the intermediate piece and the ring filter element a disc-like base is provided, which comprises a plurality of through openings distributed in circumferential direction, - wherein the closure device comprises a spring element which is arranged between the plate and the disc-like base, and which causes the closure element to be pushed onto the idling opening, - wherein the closure device is designed so that when screwing the filter housing cover onto the housing it is fixed in a precisely defined position, in which the closure element is aligned flush with the idling channel and by screwing on the filter housing cover can be adjusted into a position closing the idling channel, whereas the closure device rotates when unscrewing the filter housing cover and at the same time is moved away axially from the housing so that the closure element releases the idling channel, characterised in that - the closure device comprises at least two ribs facing towards the mandrel belonging to the housing, which ribs cooperate with at least two housing-side ramps, - in that the at least one locking element of the plate engages into the respective counter locking element of the cap, so that the closure device on the cap can only be rotated in one direction. - with a filter housing cover delimiting a receiving chamber, in which filter housing cover a ring filter element is arranged, - with a housing, in which a mandrel is arranged centrally and onto which the filter housing cover is screwed, - with at least one intermediate piece, which with the filter housing cover screwed onto the housing, is arranged between the filter housing cover and housing, - with a housing-side inlet channel, which communicates with a dirty side of the ring filter element, and a housing-side outlet channel, which communicates with a clean side of the ring filter element, - with a housing-side idling channel, through which the receiving chamber can be emptied on removing the filter housing cover, - wherein the intermediate piece comprises a cap and a separate closure device which is in the form of a plate, - wherein the cap is securely connected to the filter housing cover, - wherein the plate is arranged in the cap rotatably about the filter axis and comprises a closure element by means of which the idling channel can be closed, - wherein on an outer edge of the plate at least one locking element is provided which engages into a fitting counter locking element on the inner side of the cap, - wherein between the intermediate piece and the ring filter element a disc-like base is provided, which comprises a plurality of through openings distributed in circumferential direction, - wherein the closure device comprises a spring element which is arranged between the plate and the disc-like base, and which causes the closure element to be pushed onto the idling opening, - wherein the closure device is designed so that when screwing the filter housing cover onto the housing it is fixed in a precisely defined position, in which the closure element is aligned flush with the idling channel and by screwing on the filter housing cover can be adjusted into a position closing the idling channel, whereas the closure device rotates when unscrewing the filter housing cover and at the same time is moved away axially from the housing so that the closure element releases the idling channel, characterised in that - the closure device comprises at least two ribs facing towards the mandrel belonging to the housing, which ribs cooperate with at least two housing-side ramps, - in that the at least one locking element of the plate engages into the respective counter locking element of the cap, so that the closure device on the cap can only be rotated in one direction. - the closure device comprises at least two ribs facing towards the mandrel belonging to the housing, which ribs cooperate with at least two housing-side ramps, - in that the at least one locking element of the plate engages into the respective counter locking element of the cap, so that the closure device on the cap can only be rotated in one direction.