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03-24-2023, 08:46 AM
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#1
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Seasoned Camper
Join Date: Jan 2021
Location: Cumming
Posts: 84
M.O.C. #27901
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DEF at truck stops
I was in a local Ram dealership recently and the subject of DEF came up. I told the service manager that I buy my DEF at the truck stops when I need some. He said oh don't do that. He said it is not the same quality as what you can buy elsewhere i.e., (Autozone, Walmart,etc). He said it would "crystalize" in my DEF tank and cause all kinds of issues.
Just wondering if anyone on here has had issues with DEF from truck stops?
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2020 Ram 3500 CC, SWB, 4WD with Curt Q20 hitch 2021 High Country 331RL
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03-24-2023, 08:56 AM
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#2
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,552
M.O.C. #2283
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The quality is set by the federal government.
Lynwood
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03-24-2023, 09:16 AM
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#3
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Established Member
Join Date: Jul 2022
Location: Mooresville
Posts: 30
M.O.C. #31393
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Okay it’s regulated by Govt. Does anyone have answer to the first question here?
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Jack & Jan
Retired Grandpa/Grandma
Mooresville, NC. 2017 Montana High Country 37ft 345RL
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03-24-2023, 09:18 AM
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#4
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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I have never had a problem. I buy at truck stops because of shelf life. Rapid turnover at truck stops.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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03-24-2023, 09:23 AM
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#5
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Established Member
Join Date: Jul 2022
Location: Mooresville
Posts: 30
M.O.C. #31393
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Good to know. Thanks
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Jack & Jan
Retired Grandpa/Grandma
Mooresville, NC. 2017 Montana High Country 37ft 345RL
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03-24-2023, 09:33 AM
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#6
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Montana Fan
Join Date: Mar 2021
Location: Western NY
Posts: 492
M.O.C. #28430
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I Buy at the truck stops most of the time. No problems.
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Mark & Karen
2021 3121rl - slide toppers, cottage white, TST 507 TPMS, X-Factors, disc brakes
2021 F-350, 6.7L, SRW CC LB - B&W Companion, Bakflip cover
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03-24-2023, 09:33 AM
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#7
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Established Member
Join Date: Jul 2022
Location: Mooresville
Posts: 30
M.O.C. #31393
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Great thanks
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Jack & Jan
Retired Grandpa/Grandma
Mooresville, NC. 2017 Montana High Country 37ft 345RL
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03-24-2023, 10:07 AM
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#8
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,171
M.O.C. #6433
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I have never heard of anyone having had a problem with truck stop DEF. Or bottled for that matter.
But I can’t help but keep wondering. Tankers put new DEF on top of any old still in the underground tanks. And next time the same. And next time ….. The percentage new vs old would depend on the amount still in the tank. As such the old is still there on top of the old old, on top of the old old old, …. The old DEF can never be completely eliminated simply by adding new, just continuously diluted. Still, apparently it is not a problem. I am sure I am just over thinking it. My little engineer brain does that often.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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03-24-2023, 11:44 AM
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#9
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Montana Fan
Join Date: Mar 2020
Location: Belpre
Posts: 171
M.O.C. #25951
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I have done both truck stop def and a variety of def from Autozone, etc. If I can find it, I usually get the ultra premium blue def, because I notice a substantial increase in fuel economy and power, but I've never had an issue with any of it from the pump.
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Andy + Shari (plus our furry friends Goose and Huge). Fulltiming since 3/2020. 2020 Montana 3855BR. 2016 RAM 3500 SRW Tradesman with Tow/Haul package. Curt E16 Slider Hitch.
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03-24-2023, 11:55 AM
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#10
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Montana Fan
Join Date: Apr 2021
Location: everywhere, USA
Posts: 281
M.O.C. #28634
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I've been running truck stop DEF for close to a year now without issue. I dont believe it is a problem. I would think if would be fresher than store bought, because its always turned over with new DEF.
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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03-24-2023, 12:30 PM
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#11
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 434
M.O.C. #26015
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Quote:
Originally Posted by Andy Smith
If I can find it, I usually get the ultra premium blue def, because I notice a substantial increase in fuel economy and power,
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I guess that happens a lot.
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03-24-2023, 12:37 PM
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#12
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,702
M.O.C. #12947
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DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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03-24-2023, 01:11 PM
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#13
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Montana Fan
Join Date: Jan 2023
Location: Orange County, CA
Posts: 153
M.O.C. #32230
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I too have used pump DEF with no problems.
From what little I know about it, there is an ISO std 22241 for DEF that specs the purity of the urea, % urea, deionized water, and level of contaminates. If it’s API certified, it means it’s tested regularly. I suppose a mfr could use agricultural Urea and lower quality water if they don’t claim meeting ISO and/or skip the API cert.
Some pumps or the company’s website will list what their DEF meets. For example (see the droplet bubbles for ISO.):
https://pilotflyingj.com/media/36698/pilot-def.pdf
The boxed stuff from Peak Blue DEF and Bluesky DEF label theirs as ISO and API.
Re the Dodge dealer comment, maybe it’s like my Ford dealer always wanting me to use their oil, filters, fuel additive, service dept, etc.
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03-24-2023, 02:03 PM
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#14
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,171
M.O.C. #6433
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Quote:
Originally Posted by rohrmann
DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
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Agree. The supposed “premium” DEFs claim to reduce or eliminate DEF crystallizing and build up in the exhaust system. But the only place I have ever seen any claims of that being a problem is in the advertisements of the manufacturers that sell a “premium” grade DEF. And even if true, that would happen over time, not between tankfuls of DEF (according to those manufacturers).
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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03-24-2023, 02:21 PM
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#15
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,552
M.O.C. #2283
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Quote
DEF (Diesel Exhaust Fluid) is a specific composition of urea for application in transportation to reduce the amount of nitrogen oxides (NOx) emitted into the air by diesel engines. DEF is a high purity chemical, comprised of 32.5% urea and 67.5% de-ionized water.
It’s set by the US government. Premium is selling the sizzle instead of the steak.
Lynwood
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03-24-2023, 04:49 PM
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#16
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,933
M.O.C. #20477
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It sounds like we are trying to overthink this. I have used DEF at the gas pump and Walmart with no issue. The gas pump is certainly more convenient.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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03-24-2023, 06:01 PM
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#17
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Montana Master
Join Date: May 2006
Location:
Posts: 1,700
M.O.C. #5751
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Quote:
Originally Posted by mlh
Quote
DEF (Diesel Exhaust Fluid) is a specific composition of urea for application in transportation to reduce the amount of nitrogen oxides (NOx) emitted into the air by diesel engines. DEF is a high purity chemical, comprised of 32.5% urea and 67.5% de-ionized water.
It’s set by the US government. Premium is selling the sizzle instead of the steak.
Lynwood
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Agree....DEF is DEF is DEF, it's all the same. I prefer to buy mine in the 2 1/2 gallon containers at Wally World or a local farm and ranch store that is sometimes cheaper. Each container is dated and it should be used between one and three years, depending how it is stored. The hotter it's stored, the shorter the life. One problem with getting it at Love's/Pilot/Flying J, etc is that the DEF tank in the ground is having new DEF put in and mixed with old DEF, therefore nobody knows how old it is.
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03-24-2023, 06:10 PM
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#18
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Always got mine from truck stops.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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03-24-2023, 07:44 PM
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#19
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Montana Fan
Join Date: Oct 2015
Location: R
Posts: 261
M.O.C. #17922
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Quote:
Originally Posted by Cat320
Agree....DEF is DEF is DEF, it's all the same. I prefer to buy mine in the 2 1/2 gallon containers at Wally World or a local farm and ranch store that is sometimes cheaper. Each container is dated and it should be used between one and three years, depending how it is stored. The hotter it's stored, the shorter the life. One problem with getting it at Love's/Pilot/Flying J, etc is that the DEF tank in the ground is having new DEF put in and mixed with old DEF, therefore nobody knows how old it is.
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I'm just wondering if anyone is worried about the diesel or gas that they buy? New fuel delivered and added to old, to old, to old?
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03-24-2023, 08:28 PM
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#20
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Montana Fan
Join Date: Feb 2021
Location: Burns
Posts: 129
M.O.C. #28210
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Quote:
Originally Posted by rohrmann
DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
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2X !!!!!!
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