Does propane go bad?
Some fuels, like kerosene, diesel, and gasoline, degrade over time. But propane doesn’t have an expiration date, and it won’t lose potency while stored. However, you’ll still need to monitor the integrity of your propane storage tank. Be sure to get regular inspections by a qualified professional, including a review of the tank, regulators, and piping, as well as a leak check of the piping system and appliances.