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Old 09-30-2016, 04:59 PM   #15
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I also use the Peak Blue DEF. The one time my wife brought home another brand I got the dreaded X miles to limp mode message. It took a software update at the dealer to fix the problem.
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Old 09-30-2016, 05:27 PM   #16
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I should probably explain why I don't use the Mopar stuff (aside from cost). DEF, as you may or may not know, has a shelf life that is dependent on temperature and exposure to sunlight. For this reason I do not completely fill the DEF tank (since the rate of usage is low and I do not want the DEF to age out sitting in the tank) and wait until the gauge either gets in the red or I get the warning message on the display. At that point I go to an auto parts store or a truck stop if I'm on the road towing and buy a jug after checking the date code on the box to make sure I'm getting fresh product.

The problem with the MOPAR stuff from a dealer is there is almost never a dealer handy when I need DEF, but I can always easily find a Pilot/Flying J, Tractor Supply, auto parts store or Walmart.

And as far as a dealer giving you a hard time about warranty work, Just tell him you used MOPAR DEF - there is no way for them to tell since the stuff is all the same. Usually, a shady dealer will claim your DEF is out of date and charge you for draining and "repair" regardless of where you claim to have bought it. Actually using MOPAR DEF will likely not prevent this scam from occurring, however unlikely it is.

Buying and storing MOPAR DEF will actually increase your odds of having a problem due to aging compared to just-in-time resupply with Peak (or another ISO/API certified brand).

Be careful buying from stores that store it outside or sell a brand in clear containers exposed to sunlight (Autozone's house brand)
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Old 10-15-2016, 08:45 PM   #17
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2016 2500 with 35k miles. I only buy Peak in 2.5 gal jugs or fill at truck stops. Prefer truck stops but I have bought Peak when needed.
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Old 10-15-2016, 09:15 PM   #18
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Thanks all. I have 6500mi on my Cummins TD and filled up the DEF at a truck stop ... thanks to all who posted ... got 4 gals at $2.89/gal ... much cheaper than the boxed stuff. Anyway, you made me more comfortable with trying the truck stop DEF. Thanks for sharing! - Rich
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Old 10-16-2016, 06:11 AM   #19
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Originally Posted by AIRHEDS View Post
Thanks all. I have 6500mi on my Cummins TD and filled up the DEF at a truck stop ... thanks to all who posted ... got 4 gals at $2.89/gal ... much cheaper than the boxed stuff. Anyway, you made me more comfortable with trying the truck stop DEF. Thanks for sharing! - Rich


My only comment on truck stop DEF is to make sure and rinse the side of your truck if you spill any. They say that stuff will rust your truck in a heartbeat.
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Old 10-16-2016, 07:35 AM   #20
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Don't care for DEF. I've been told many times the only thing that goes wrong with today's diesels is the pollution stuff. I carry and only buy the FORD brand. Still had an issue on our trip this past summer. Pulled out of lunch stop, got the dreaded message "In 50 miles you will not be able to exceed 50 MPH". After that idle speed. Fortunately it was Monday about lunch time, local Ford dealer in Kalispell MT, Valley Ford took us in and fixed it in two hours including all kinds of testing. A sensor went bad along with the injector for the DEF into the system as it had crystallized. Known problem, not a recall as it's very random with 2014 and 2015 super duties. Thing I got a kick out of is the top Diesel Mechanic is a 30 something who has a computer degree and a diesel degree, almost everything he did in diagnostic and after fix tests was on a laptop sitting on our console, even speed and shifting.

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Old 10-16-2016, 07:58 AM   #21
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The young mechanic probably made a good career decision switching from the IT industry to the automotive industry.

So far no issues since filling up DEF from the pump at a local truck stop a month ago.

Keeping my fingers crossed.

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Old 10-17-2016, 07:06 PM   #22
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DEF question - 2016 RAM 2500/3500 Owners With 6.7L Cummins Diesel

Quote:
Originally Posted by AIRHEDS View Post
Thanks all. I have 6500mi on my Cummins TD and filled up the DEF at a truck stop ... thanks to all who posted ... got 4 gals at $2.89/gal ... much cheaper than the boxed stuff. Anyway, you made me more comfortable with trying the truck stop DEF. Thanks for sharing! - Rich

I've run hundreds of gallons of truckstop DEF thru a 15L Cummins. That KW held 18/gls plus 300/Diesel. Best practice is to top off DEF tank at every fill, IMO.


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Old 10-17-2016, 07:34 PM   #23
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I buy DEF at Walmart and add about every 3,000 miles on my Duramax. I buy the house brand that meets the standard (can't remember what it is called). It's 8 something for 2.5 gallons. 58,000 miles on my 15 Duramax. Only issue has been bad heater in DEF tank. Covered by warranty last month.
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Old 10-17-2016, 07:48 PM   #24
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I buy DEF at Walmart and add about every 3,000 miles on my Duramax. I buy the house brand that meets the standard (can't remember what it is called). It's 8 something for 2.5 gallons. 58,000 miles on my 15 Duramax. Only issue has been bad heater in DEF tank. Covered by warranty last month.


Since the smart people at GM decided the DEF filler for Duramax engines made sense to put under the hood, the convenience of topping off at the gas station is greatly reduced.
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Old 10-18-2016, 07:02 AM   #25
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Since the smart people at GM decided the DEF filler for Duramax engines made sense to put under the hood, the convenience of topping off at the gas station is greatly reduced.
I use DEF in container so filling it up hasn't been an issue for me.
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Old 10-18-2016, 09:26 AM   #26
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I use DEF in container so filling it up hasn't been an issue for me.
That's my point exactly! DEF is cheaper and fresher at the truck stops; and it's convenient to top off while getting fuel - but ONLY if the DEF filler is in a convenient spot.
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Old 10-19-2016, 04:48 PM   #27
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Like I said, the location hasn't been a problem for me. When I fill up with the container that is date coded I fill up at my convenience not when I buy fuel. The truck stop price isn't much savings over Walmart house brand from USA.
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Old 10-19-2016, 06:50 PM   #28
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That's my point exactly! DEF is cheaper and fresher at the truck stops; and it's convenient to top off while getting fuel - but ONLY if the DEF filler is in a convenient spot.
How do we know that it's fresher?
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