Prestone All makes /All models in Mazda CX50did I kill it?

LOL. it's universal coolant, when have you heard of someone using universal coolant and having an issue. Only time I hear of an issue is when someone mixes one specific chemistry with another non universal specific chemistry. No issue here. All I've ever used is universal and still do today and I've never had an issue.
 
why not just use 5oz distilled water?

since you used non oem coolant of a different chemistry...
you should change it early now 🥴

LOL. it's universal coolant, when have you heard of someone using universal coolant and having an issue. Only time I hear of an issue is when someone mixes one specific chemistry with another non universal specific chemistry. No issue here. All I've ever used is universal and still do today and I've never had an issue.
all universal coolant is different than 2 different coolant chemistries..

but I am failing at understanding why the OP didnt top off with Water for 5oz... even tap water.

Your Mazda most likely came with a P-HOAT coolant. I don't think 5 ounces of OAT coolant (even though that Preston's contains 2- EHA) will hurt anything.

Not a chemist but I thought mixing those 2 could cause a bad reaction and possibly gelling.

@kschachn being a chemist might know?
 
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I've seen the results of pouring non-Dexcool into a Dexcool car (S10 Blazer). I don't think he poured enough in to do the damage I saw (gelled and overheated) but you gotta to be careful mixing coolant types unless you know the chemistries will mesh.
 
It's literally sold as all makes all models safe to mix with anything coolant and comes with a corresponding warranty. Prestone does have actual chemists working on this stuff, and they do research, file lots of patents, and perform all sorts of testing. You will almost certainly get rid of the car long before any differences in coolant performance become apparent. The people concerned with universal coolants containing 2-EHA "eating" stuff somehow never have pictures of anything it's supposedly eaten. The only evidence is GM engine failures from the 90s, where it was a combination of bad design, bad maintenance, and possibly first-gen chemistries, rather than any fundamental issue with the coolant ingredients.

I've run that stuff for 100s of thousands of miles in my vehicles and have never had any cooling problems that could be attributed to a chemical incompatibility. So have hundreds of millions of other people over the last couple of decades that these coolants have been on the market. If there was a major chemical incompatibility issue there, it would have become apparent by now, there would be class action lawsuits, manufacturers would be issuing warnings not to use the stuff, et cetera. None of that is happening.
 
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