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Old 01-23-2019, 05:04 PM   #41
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M.O.C. #20587
Originally Posted by twindman View Post
DEF shelf life is 12 months if stored under 86 degrees. Up to 95 it is 6 months. so mainly just don't buy it and stick it somewhere hot for a few months. Most parts of the country don't stay over 85 for long, so I would think just don't buy it at a gas station that has it sitting out side in the heat.
That's just plain weird. I've read that same tripe many places. If that were the case, owning a truck in Texas or the southwest would subject the DEF to extremely high temps when it is "stored" in the vehicle DEF tank - even rolling down the hot highway or parking in the driveway for extended periods of time. So the entire south U.S. should be having DEF issues all summer long which can be 6 months long in some parts of the country.
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Old 01-24-2019, 06:32 AM   #42
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RoadRunnerTR21 wrote....

"My code was 122035133271. By breaking the code down, you can tell when this batch was produced. Here is how you can do that:

First 2 digits is the plant code. So mine was 12.

The next 2 digits tell me the year it expires. However, in order to tell when it was made you have to subtract 1. Since my code said 20 and I subtract 1 that gives me 19 for 2019.

The next 3 digits represent a Julian day which is better known as the day of the year it expires. However, you will need to subtract the stamped 3 digit code from 365 to determine the day it was made. Since my code said 351 and I subtract 351 from 365, that gives me 14. The 14th day of the year is Jan 14.

This simply means that the manufacture/blend date for the box I bought was Jan 14, 2019. As of this posting that was 9 days ago so I'd say that is pretty fresh....."

Not saying this is wrong but it is a bit of an overthink IMHO.

Now if it was me... and knowing that properly stored DEF is good for ~2 years...

If I was shopping for DEF and was looking for the code, knowing the portion of the code consisting of "20351" was it's expiration date as 2020 day 351 (or around dec 15, 2020) would be easier to understand than trying to back date it to when it was made. Simply put, look for the highest number in that sub-group on the code... that is your selection. If the dates on the product are less than 1 year away... go shop elsewhere.

Just my way of thinking on this. On the store shelf, most flunkies do not pay too much attention to putting the new stock at the back like they should, but you as the consumer should be checking for newest stock(the one with the furthest out expiration date) every time you buy it. Caveat emptor.
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Old 01-24-2019, 08:39 AM   #43
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BiggarView, Thanks Great info!
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Old 01-24-2019, 10:47 AM   #44
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M.O.C. #21610
Be sure the DEF is fresh. Learn to read the use by date codes. Shelf life varies by storage temperatures and conditions.
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