Under ideal conditions, diesel fuel can be stored between six and twelve months. To extend the life past twelve months, even under the best conditions, it needs to be treated with fuel stabilizers and biocides. If the fuel can't be kept cool, below 70 degrees F consistently, twelve months is the longest reasonable estimate for storage.

Diesel can sometimes last longer if stored correctly and treated with additives. We must be aware of fuel quality and take precautions in storing it. ‍ Key Takeaways. Diesel fuel lasts 18-24 months in your vehicle’s fuel tank if your car avoids extreme temperatures. Diesel fuel lasts for only 6-12 months on a shelf.
Your main defense against water and algae is two fold: Treat all fuel required for long-term storage with algaecide. Commercially available diesel fuel stabilizer is essentially algaecide which creates a hostile environment for supporting life. Lack of living organisms (like algae) means clean fuel. Keep diesel tanks full.
A tablespoon or two in a lawnmower or chainsaw gas tank is enough to allow gasoline to burn cleanly even after years of storage. One small bottle of stabilizer preserves a full tank of fuel in a car or truck. Then run the engine for a few minutes to ensure the stabilized fuel circulates throughout the fuel system.
Different engine designs, varying tank sizes and driving habits all determine how long a tank of fluid will last. While your car or truck will alert you when your DEF tank is getting low, consult your owner’s manual or ask your dealer for the average driving window you can expect between fill-ups. Adding DEF fluid to your diesel-powered rig
Myth #3: “All STA-BIL products are the same, just different colors.”. To be blunt, this myth is false. Each product is specially designed to address and prevent a unique set of problems. STA-BIL Fuel Stabilizer keeps fuel fresh for up to 24 months, making it ideal for long-term engine storage. 260g9.
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    • how long does diesel last in a car tank