Hello, I would like to change the glow plugs soon and during the research I noticed that according to the repair guide there are both ceramic and metal glow pin plugs. Furthermore, I read in the Audi Forum that when switching from ceramic to metal an update is necessary for the ECU. How to recognize whether metal or Keramit is installed I know from the guide, but have not yet found the time to look. I would like to know if it is known in which period ceramic and metal were installed and whether a software update would be necessary in the case of the thick in the case of the switchover?