Before choosing fluid note that engine code EJ25 and volume of 2.5 were installed to your car in 2005. For 2005 Forester engine it’s necessary to get normal temperature balance. Only Red antifreeze type is suitable and you’ll need 6.5 liters of it. For Subaru Forester it’s important to have optimal antifreeze inside. It’s important to provide cooling for Subaru’s engine with 2.0 liters volume.
Look at Subaru’s requirements and make your 2006 Forester serve longer and with no problem. Better buy 7.3 liters of good antifreeze in Red color. A lot of EJ204 motors are used long in Subaru cars but only with good service. Produced in 2005 the 2.0 engine in Forester model will serve longer by this.