I have 2 bottles of unopened antifreeze ready to use, purchased in 2014? Does age hurt the efficiency of the antifreeze. It is starting to get cold....
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Jim
Sometime life gets in the way of living.......
Jim the consensus if you want to call it that seems to be use it within 5 years but some have used antifreeze well beyond that mark with no issues. One guy on a forum bought a bunch at an auction and was still using it without a problem 8 years later. If it is well sealed you will have no issues.