- Jul 15, 2014
- Truck Year
What fluid are you using? I see some at autozone and other car places. Just wondering if one is better than the other.
Keep in mind it has a shelf life. Around 1 year in the proper room temperature it's stored in if I remember correctly.It's funny... our local tractor dealership (I work for them) sells it for $1.70/gal... The truck stop down the road is at $2.88 per gal. Only difference is I have to have my own container for the dealership to pump into... Think I'll be buying 5 gallons at a time, just to have some extra with me in the back of the truck!
The critical variable regarding DEF shelf life is the ambient average temperature. The following information is provided by Ford Motor Company:
Average ambient temperature is less than or equal to 50 degrees F / Shelf life is 36 months
Average ambient temperature is less than or equal to 77 degrees F / Shelf life is 18 months
Average ambient temperature is less than or equal to 86 degrees F / Shelf life is 12 months
Average ambient temperature is less than or equal to 95 degrees F / Shelf life is 6 months
Average ambient temperature is less than or equal to 104 degrees F / Shelf life is 2 months.
For example, the average ambient temperature here in Myrtle Beach, SC is 64 degrees. That should equate to a DEF shelf life or approximately 24 months.
You can Google your location to find the average yearly ambient temperature. Hope this helps.
I hope that shelf life chart is rounding down because I'm certain more than 50% of owners in the south don't go through a tank of DEF every 6 months...I need to refill about every oil change (10k miles), that means that my truck is driving around with expired DEF in it most of the time.