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Can I add propylene glycol based antifreeze to my existing ethylene glycol based antifreeze?

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Can I add propylene glycol based antifreeze to my existing ethylene glycol based antifreeze?

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Ethylene glycol and propylene glycol are chemically very similar and can be mixed without harming the cooling system. Ethylene glycol does have better heat transfer properties than propylene glycol. Adding propylene glycol does not make the ethylene glycol less toxic.

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