Topping off coolant with Peak 50/50
 

So a Couple years back I remember looking at my coolant reservoir tank and noticed it was slightly below the low. Little did I know that coolant expands when the car is warm, and my car was still cold.

Anyways when I thought it was low, I topped it off with some peak 50/50 antifreeze; the antifreeze that apparently can mix with any other coolant.
After reading the consequences of mixing any other coolant with the factory blue coolant my anxiety kicked in.
Should I be worried? My water temp never gets any higher than 100 Celsius and I'm turbocharged.

Wouldn't hurt to flush the coolant system and add fresh coolant.

I'll do that then. Just hope I didn't damage anything like from corrosion or something.

Never mix with other brand. I would go local Subaru/Toyota dealer than get few bottle of blue coolant and flush it out JIC

...but that's just me

Don't worry too much about it. All newer antifreeze are compatible, regardless of color, with only small changes to corrosion inhibitors. Newer NOAT and OAT coolants are getting ratings of up to 15 years of service life based on the amount of these inhibitors added to the antifreeze. They all have ethylene glycol base, but a lot of manufacturers list their corrosion packages as "proprietary ingredients", which, just like oil manufacturers, they don't have to disclose.

But I'd highly doubt a failure to come from adding in a bit of PEAK for topoff. As long as it is the long-life variant, you should be just fine.