Propane itself has no shelf life much like how oxygen or nitrogen can’t “go bad.” Most grill propane tanks are made of very solid metal. Replacement of the tank should only really be necessary if you the tank itself is beginning to degrade badly (it’s springing a leak or its cracking or warping). If the valve at the top is also broken, it may be wise to replace it. However, there is no set time for when you should replace the propane tank; it really just depends on the condition of the tank since the gas inside will always be good.
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