2006 Subaru Forester 2.5 NA

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What would be the best aftermarket (Walmart, Napa, etc.) coolant for a high mileage 2006 Forester? I have a new Subaru radiator cap, and the conditioner on hand. I am only interested in draining the rad/coolant bottle. The color of the coolant in the bottle is greenish brown, a mix of used coolant from neglectful owner. This is a charity job, just don't want to make things worse. I have peak Global green in the garage now. Walmart has Zerex asian I think. Thanks in advance all!
 
I'm no expert but someone a month ago was saying this stuff is great and it can almost be used/combined with anything. It's pretty cheap too and comes in concentrate and pre-diluted

https://peakauto.com/products/antifreeze-and-cool/auto/peak-antifreeze-coolant-full-strength/

Here are the threads discussing this particular formula
https://www.bobistheoilguy.com/foru...hy-cant-i-use-this-peak-in-uh-everything
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5230145/peak-has-a-new-antifreeze
 
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