Abstract: For lubricating-oil filters for combustion engines, wherein the space available for the installation and removal of the filter cartridge is very confined, there are provided, instead of one filter cartridge, at least two filter cartridges which are axially arranged in series one behind the other.In order to allow these filter cartridges to be installed or removed without difficulties, there is proposed for the connection of these filter cartridges an articulated connecting means which ensures that the filter cartridges can be tilted relative to each other. A clip hinge or a wire or plastics-material strip, provided with clasps or detents, can be used as the connecting means.