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.
 
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