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Old 07-27-2016, 01:05 PM   #1
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DEF: Dealer, Retail or Truck Stop?

I'm heading off on a 4000mile trip next week to Glacier National Park. My Ram 2500 DEF tank is full. Should I purchase so DEF from the auto parts store for the trip? Most of it seems to be Peak which is ISO-22241-1 compliant or should I just use a truck stop DEF pump if I find I need to top off. I realize the truck stop will be the cheapest.

Anyone use the Peak brand in their RAM or GM diesels?

The dealer says I should stick to Mopar but isn't DEF only made by a couple of companies. As long as its fresh it should be OK, right?

Kelvin
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Old 07-27-2016, 01:24 PM   #2
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Kelvin,

I use Blue DEF in the cardboard box carton and I get it either from Advance Auto Parts or WalMart. You can almost always find a WalMart, and you get a lot of warning. In case you are not up on the gauge non-linearity, my tank is a five gallon tank, but when down to 1/4 on the gauge a single 2 (or 2-1/2?) gallon box will put it up to full. I usually run it down to empty ( and I still haven't seen the "200 miles to limp mode" warning) and put in one box in an attempt to not leave the DEF in the truck too long. I've read it deteriorates at 90 and above temperatures.

I tried to get fuel and DEF at the truck pump at a Pilot or Flying J and the fuel nozzle wouldn't run slow enough to get an appreciable amount of fuel in my truck before it would shut off and the nozzle wouldn't fit my DEF fill (if I remember correctly).

I envy you the trip to Glacier. We were planning on a trip to Wyoming but family matters and a new (to us) trailer got in the way. Hopefully next year.

Al
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Old 07-27-2016, 01:29 PM   #3
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Dont bother keeping it full. When it gets down to 1/4 or so then top it off. Now as far as where to top it off. Busy truck stops go through a lot more def then other places which insures they have the freshest def.
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Old 07-27-2016, 01:42 PM   #4
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Kelvin, I have basically the same truck -- only it's a '14. I have the same process as Al. I buy DEF at AutoZone or Advance Auto Parts. Just bought two boxes for $25. Have also bought it at Wal Mart, and virtually every station that sells diesel has DEF. My gauge stays at full until I've used about 2 gallons of DEF, then it drops to around 3/8's of a tank. I've got about 42,000 miles on my truck -- all but about 2000 are towing -- and my DEF utilization rate varies on terrain. If I'm doing lots of mountains I'll use more, if flatlands, quite a bit less. I'd guess I get around 1000 miles per gallon of DEF. Barry
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Old 07-27-2016, 02:02 PM   #5
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I have used GM, peak and Walmart house brand. All have been fine. Peak as I recall has code for date which is first 2 digits ignore, next two minus one is the year, next three are days from the end of the year. I buy before major trip when I know Def is getting low.
50k miles almost all towing and def usage is insignificant.
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Old 07-27-2016, 02:11 PM   #6
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Good to read of your guy's experience. I have 1,800 miles on my 2016 thus far, and I haven't had to put DEF in yet; I am still reading full.

I would probably set out without any on hand and plan to find some along the way because of the high temperatures you are likely to be in along the way.

I have read a few hoar stories of folks whose DEF tanks got cross contaminated, so I will be sure to use a new funnel when filling; a benign I hear you get with Mopar brand.
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Old 07-27-2016, 06:12 PM   #7
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DEF is DEF is DEF, as long as it is to ISO 22241.

I buy mine at WalMart in the 2.5 gallon jugs. Usually Blue DEF; but whatever is cheapest.

I have the same truck ('16 Ram 2500 with the Cummins). What I do is wait till the tank reads 1/2, then dump in the entire jug at the next fuel stop.

With the tank size of 5.9 gallons (I think) this plan works pretty well for me. Towing, I go through more jugs than not towing; I'd guess 4 to 5 thousand miles per jug, but that is just a guess. 21k on the truck; love it.
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Old 07-27-2016, 06:17 PM   #8
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Quote:
Originally Posted by Thiss View Post
Good to read of your guy's experience. I have 1,800 miles on my 2016 thus far, and I haven't had to put DEF in yet; I am still reading full.

I would probably set out without any on hand and plan to find some along the way because of the high temperatures you are likely to be in along the way.

I have read a few hoar stories of folks whose DEF tanks got cross contaminated, so I will be sure to use a new funnel when filling; a benign I hear you get with Mopar brand.
Blue DEF jugs at WalMart come with a flexible pour nozzle that fits the DEF inlet perfectly.
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Old 07-27-2016, 08:12 PM   #9
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Based on recent experience I would suggest getting DEF at a high volume truck stop and not filling over half a tank. My 2015 Ram CTD uses very little when not towing. I was almost empty and decided to fill before towing up to the Mogollon Rim for the 4th of July. I bought at Walmart as I had several times in the past. Per the date code it was 28 days old. I towed up the mountain with no problems but a couple days later while running around the warning came on that incorrect def detected. see dealer. Got it to the dealer before it went into limp mode. They determined that the DEF was bad. They showed my their chart indicating that the shelf life was 2 months at 104 degrees. It has been over 110 here. They had to replace several parts in the emission system which was covered by warranty, but I had to pay to have the DEF tank drained and flushed at a cost of $360. To make a very long story as short as I can it took 14 days to get my truck back and their solution to prevent this from happening again was to never fill over half in the summer here and if I don't use it up in 30 days have them drain the tank (at $360/time). This is after I had my issue escalated 4 times at FCA. I've purchased a def refractometer from Amazon and a pump to drain the tank to try to stop this from happening. The better solution would be for us to get out of AZ entirely for the hotter months.
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Old 07-28-2016, 10:42 AM   #10
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Was the DEF you purchased sitting in your truck just prior to towing up to the Mogollon Rim or had you purchased it months earlier and it was sitting in your hot truck all that time? Was it Peak DEF?

I found this youtube video on DEF filling from a truck stop.

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Old 07-28-2016, 11:10 AM   #11
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O'Reilly's Blue Def 2.5 gallons are on sale.Two for $25.00

I am leaving for Glacier Friday July 29th for a couple of weeks.
Maybe I will see you there!
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Old 07-28-2016, 11:23 AM   #12
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Really makes no difference. Essentially water and urine. Actually that is what it is.
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Old 07-28-2016, 11:33 AM   #13
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Quote:
Originally Posted by Moflash View Post
O'Reilly's Blue Def 2.5 gallons are on sale.Two for $25.00

I am leaving for Glacier Friday July 29th for a couple of weeks.
Maybe I will see you there!
We are leaving August 5. Will be on east side for the first week at St Mary and Many Glacier then over to Fish Creek for the 2nd week.

Kelvin
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Old 07-28-2016, 11:56 AM   #14
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Just watch for a black F350 Platinum with a CanAm 4 wheeler in the box with two Hobie kayaks on top pulling a 28ft International.That would be me
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