Whats up Guys!
I had just about the same question with my car. I just recently bought it and im getting a complete cooling system upgrade and I was wondering about the coolant as well
I was thinking about getting Prestone Flush and running it through the system for about 20 minutes on idle then drain, then filling it with just water let it idle for 5 minutes then drain and removing my radiator, fans, upper and lower hose and running a garden hose thru it until it comes out clear. then install all my new parts (Yonaka dual row rad., new fans, Shroud, mishimoto lower and upper hose, perrin overflow tank, mishimoto thermostat, and the mishimoto coolant and PVC hose kit then running Subaru coolant with Distilled water, Purple Ice and the Subaru Coolant conditioner.)
I think this would maybe be the best combination but if anyone has a better idea please let me know