the outlet side end plate 74 both in the radial direction and in the axial direction the support webs 82 are respectively supported in the radial direction at support points 83 shown inter alia in fig3 and 11 on the inner side of the housing container 20 the aforementioned leveling elements 58 are located radially outward with respect to the element axis thus the filter axis 32 on the inlet side end plate 74 the leveling elements 58 are made of polyurethane they are integrally connected to the inlet side end plate 74 the leveling elements 58 are arranged on a raw air side of the filter element 18 the leveling elements 58 are arranged on circumferential sides of the inlet side end plate 74 which are diagonally opposite with respect to the filter axis 32 the imaginary center point of the leveling elements 58 is located here on a minor axis of a flat oval cross section of the filter element 18 in the direction of the minor axis the filter bellows of the filter element 18 has a smaller radial extension at the inlet side end face 66 than at the outlet side end face 68 the minor axis lies in an imaginary plane which extends parallel to the flat oval base area of the filter element 18 the minor axis is the short axis of the imaginary plane through the midpoint thereof in contrast the major axis is the long axis of the imaginary plane through the midpoint thereof the leveling elements.