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Thanks for that info. I wonder how important the level of phosphate really is? Thanks to everyone else for their thoughts also. It does sound like 10x is pretty good and parsing the distinctions beyond that may be splitting hairs.

@Char Baby Thanks for the reply. Yeah, I really don't remember why I registered for the forum in 2016, but never posted anything. I was myself surprised to see the "1" next to my post. On the other hand, the last time I messed with coolant in a car myself, there was only one kind of coolant at...

I read in one forum post that Peak 10x contains phosphates, but I've seen that nowhere else, and it's not in the spec sheet provided by OWI. I'm just wondering, because I used Peak 10x to refill my 2006 Mazda3, after replacing a cracked overflow reservoir and flushing the system. As far as I...