Anyone know shelf life of VW G-12 antifreeze or can provide limk from mfg?
The rule of thumb for all coolants is a shelf life of at least three years when stored in the original closed air-tight containers at a temperature of maximum 30°C (86°F).
"Glysantin G 05 has a shelf life of at least three years when stored in originally closed, air-tight containers at temperatures of maximum 30 °C. Do not use galvanized containers for storage because they may corrode."
The primary limiting factor in the shelf life of a coolant is silicate instability, since silicate will eventually polymerize to silicate gel.
The VW G-12, which BASF (who developed it), sells as Glysantin Dynamic Protect/G 40:
Since this is silicate free, like Dexcool, an unopened container in normal temperatures should last for years.