For sufficient use of Peugeot 308 you need to use suitable antifreeze. You may use code of motor RHR(DW10BTED4) and volume figure of 2.0 or just tell the 2013 year of production to buy liquid. It’s important to provide cooling for Peugeot’s engine with 1.4 liters volume. To maintain cooling system you need 6 liters of Red coolant. There is no chance 2011 308 engine will work efficiently with bad cooling.
Use your 1.6 engine longer in 2007 308 by keeping these rules. If you choose other than Red coolant or use less than 6 liters, you can’t expect normal work. It’s obvious that every 5FX(EP6DT) motor needs good service as stated by Peugeot in instruction. So better use Peugeot’s advice for servicing 2010 308.