You may use code of motor RFN (EW10J4) and volume figure of 2.0 or just tell the 2009 year of production to buy liquid. For Citroen C8 it’s important to have optimal antifreeze inside. For filling up the system you will use 7.2 liters of special Red coolant type. You should be careful at choosing liquids for Citroen especially for vehicles having 2.0 motor. In other way 2005 C8 won’t be used quite long and efficiently.
So better use Citroen’s advice for servicing 2004 C8. A lot of 3FZ(EW12J4) motors are used long in Citroen cars but only with good service. If you choose other than Red coolant or use less than 11.3 liters, you can’t expect normal work. Produced in 2005 the 2.2 engine in C8 model will serve longer by this.