Please spend a lot of time researching this subject for your specific motor. Go to a Subaru forum, figure out what motor you have. Some Subaru's have headgasket problems, they have an additive to use with coolant changes, if your type of engine is supposed to have it added, please ad it! Or you will have issue's later down the line. I would just use the Subaru coolant If I was you. Pentofrost A2 would be your other option.