The invention relates to the use of antioxidants of different kinds and concentrations in electrochromic elements having an ion conducting component to suppress self-discharging. In one aspect, the method includes preparing a first release area and a first attachment area around the first surface area on a first surface, attaching a base substrate to the first surface, and forming a display unit on the base substrate corresponding to the first release area of the carrier substrate. The communication control module is configured to periodically send a set of second status signals intended to be sent to the remote device via each communication mode from the set of communication modes when the communication control module is in an emergency operating mode and the communication mode is available. According to the invention such drawbacks can be avoided or reduced in that the filter material of a lower portion and a bottom portion in the continuation of the lower portion of the bag filter is formed in its entirety or in an outer filter layer by a liquid-tight material. A method is also provided of producing an oil filter assembly having a housing defining an oil filter chamber adapted to receive an oil filter element.