Shelf life of red Toyota premixed antifreeze

[Colt]

I have a gallon that's about 5 years old.I believe it's a premixed gallon.

What is the shelf life of antifreeze?

 

[MegaCorp]

When I called Prestone they told me 5 year shelf life. When I asked what happens to it after 5 years, I was told they have only tested it to 5 years, so can't comment. I would say it will last a VERY long time. If there are no clumps in it, I would use it without worry

 

[crazyoildude]

We use the green whenever we do a rebuild on most toyota's
But i think it would be ok some people never change their antifreeze until something happens... That is a sealed container and should be fine

 

[mechanicx]

I'd imagine if sealed up the inhibitors are probably stable for at least 7 years plus 2-3 years in service.

 

[Colt]

Thanks,Guys.