Are all Ethylene glycol based

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Although I'm not an expert, as far as I know, if its green and says its ethylene glycol its compatible with any other antifreeze that's also green and says its ethlene glycol. It used to be that the green ethylene glycol was what all vehicles used, and from the time I started driving in 1960 until today I've never had a compatibility problem in any vehicle using that type of antifreeze. When I had to add or replace antifreeze I just bought whatever brand was in whatever store I went to to get antifreeze.
 
If you want green EG based antifreeze, Texaco makes a good one. Advance Auto Parts stores sell it. Sometimes they won't have it displayed & you'll have to ask for it, but they've got it. Around $8/gallon.
 
Is that the Havoline formula??

I've heard that all Prestone formula's are now a derivative of Dex-cool??

Reason I ask is I have a pre-mix 50/50 bottle of Prestone - nothing fancy bottle that states it's a ethylene glycol base, thing is though - it's YELLOW, not green!

What happens if a yellow antifreeze (Dex-cool possibility) has been mixed in with the old true GREEN antifreeze?
 
Nothing at all according to the blather on the backside of the Prestone jugs. But you couldn't count on the new Prestone's extended-life properties. (Prestone's extended life yellow syrup lists exactly the same chemistry as the company's GM licensed orange DEX-COOL formulation. Ditto Supertech's blue-green extended-life brew.)
 
antifreeze's compatible?

Have 3 trucks - 85 Toy, 97 Isuzu, & 2001 Diesel

I like to carry extra fluids in the vehicles just incase and would like to know what particular green antifreeze I should get. I don't want extended life, Dex-cool (of any form), just the old basic green antifreeze.

Can anyone help?
 
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