---- Alain Thibault <alainthibault@TELUS.NET> wrote:
> Crazy question...i have a brand new gallon (4liters) of never used coolant but it is about 12 years old. Is it still good to use?
>
> Sent from my iPad 2

Here is one manufacturer's answer:

http://prestone.com/learn_more/frequently_asked_questions#faq-row-465

I don't know if I would take all I see here for the gospel, but at least for Prestone coolant, I think you are safe.  Others may have different chemical additives, so you might want to check with them.

--
David McNeely