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...anyone aware of any problems with GM's new "5 year" antifreeze? ...just wondering if its cracked up to what its supposed to be.
 

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No, seems to pretty much be what they claim it to be.

You can buy antifreeze at places like Auto Zone, yellow in color, premixed to 50/50, advertised to be compatible with any/all other types of coolant. I have personally used it with green and ELC without a problem that I can see.

Do NOT mix green with any of the extended life coolants. Turns into a nasty jelly and will require a cooling system flush.

Anti freeze will never loose its ability to protect from freezing. However, the additives that prevent cavitation, rusting, foaming and a change of pH will deplete in time. Still a good idea to flush your cooling system and replace the antifreeze periodically.
 
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