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Old 01-08-2015, 06:06 PM   #1
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def shelf life

I have a 2014 360 ql, and I bought it in October 2013. the tag says that the chasse was built in 2012.
ok here is my problem . my wife and I have not been able to go and use the MH because medical problems that keep in popping up and now this year we can go ( yea ) so should I drain the def. tank and put new in it, because def. only has a shelf life of 2 years ( which I found out looking on the internet ) or just go and not worry about it.
the tank is full now . I toped it off with about 2 1/2 gal in 2013
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Old 01-08-2015, 06:30 PM   #2
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Don't worry about it, what can go bad with water and urea ?
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Old 01-08-2015, 06:33 PM   #3
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From what I read the temperature effects the shelf life. Sustained higher temps shorten the life of DEF. That appears to be above 68 to 86 degrees. You mention its going on two years. If it's not difficult, I would drain and replace, only because if the system malfunctions, you might be kicking yourself. Your call.
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Old 01-08-2015, 06:40 PM   #4
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I stand corrected, on rereading def can degrade, but I still wouldn't get too worried about it since it's in your vehicle.
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Old 01-08-2015, 06:57 PM   #5
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it doesn't cost to much to drain and fill it. Lots cheaper than what a system malfunction could cost, not including the hassle it could cause.
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Old 01-09-2015, 12:19 AM   #6
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I was told by a diesel mechanic that I trust with all my mechanic work that older DEF can be recharged by adding newer DEF to the tank. So I wouldn't worry about it. Just add some to the tank and you will be good to go.
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Old 01-09-2015, 12:57 AM   #7
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The other concern is when diesel fuel sits for a long period it can grow algae. I remember reading this on one of the diesel forums. Not sure of the treatment or exactly what it will do to your engine but a good question to ask.
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Old 01-09-2015, 09:01 AM   #8
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I would add as much new DEF your tank will hold. If your tank is full I would add some new as soon as you use some up.

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Old 01-09-2015, 09:15 AM   #9
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Quote:
Originally Posted by CAT-RN View Post
I would add as much new DEF your tank will hold. If your tank is full I would add some new as soon as you use some up.

Russell
As CAT says. I had used DEF that had degraded (probably high temp) and didn't realize it until I got a message on my dash. It said to add fresh DEF to the system and if that didn't clear the message, to then drain the tank. I added fresh DEF and it cleared the message out within 20 miles or so.
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Old 01-09-2015, 10:42 AM   #10
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This is what you need for algae.
Hold on to your wallet it's by no means "cheap"
But it's far more cheaper then if you do get a tank full of algae.

Power service "bio kleen" diesel fuel biocide
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