Filter device (1) in particular for in-line oil filtering, the device may be applied in combination with an oil cooler device (2), and comprising a filter housing (16) and a lid part (17), an oil inlet port (3) situated radially outside a filter part (5; 20; 20A-20D) for radial flow filtering of oil, and an outlet port (9) in connection with an interior space (21) of said filter part. The filter part (5; 20; 20A-20D) has a radial thickness larger than the radial thickness of its interior space, while the axial end faces (30) of the filter part being formed by the filtering means of said part, and the device (1) being provided with internal, essentially flattened filter end face (20F) contacting faces (14F, 24F, 16AF, 16BF, 17F) for axially closing a passage of oil, and having a diameter matching that of the filter part. IMAGE
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