A six jug carton of Zerex G-05 coolant can be had for $86.95 at A**zon. That's a good deal, especially with no tax and free shipping. But since it would take me quite a while to go through 48 quarts (when mixed with water) of coolant, it made me wonder if the stuff has a shelf life. According to Valvoline tech support: five years.

Can anyone tell me why this would be....especially since, after installing it in the car, it's good for five years? What exactly happens to coolant sitting in my garage in an unopened jug?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife