JMM (Michael) posted:Either way it flows it should work the same. Subarus are a little weird with the coolant system, like the thermostat is on the return line. Strange, but a couple hundred thousand Subies on the road and it all seems to work.
If you don't want a stat on the return line and need things a bit more German, a BMW stand alone stat could be easily adapted onto the outgoing line. There wouldn't be any advantage though.