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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: 7,669
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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03-29-2023, 02:01 PM
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#5
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Montana Master
Join Date: Mar 2007
Location: Virginia Beach
Posts: 710
M.O.C. #6958
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Quote:
Originally Posted by 1retired06
I have never had a problem. I buy at truck stops because of shelf life. Rapid turnover at truck stops.
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Same here. Never had a problem
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Bill and Lisa Rearick
2023 Grand Design Reflection 367BHS
2020 GMC SIERRA 2500 Denali, 8 ft bed, SRW, Duramax Diesel w/10 speed Alison Transmission.
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03-24-2023, 09:23 AM
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#6
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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
__________________
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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#7
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Montana Master
Join Date: Mar 2021
Location: Western NY
Posts: 547
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, X-Factors, disc brakes, Gen-Y pinbox
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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#8
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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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#9
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,361
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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03-29-2023, 01:17 PM
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#10
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Montana Fan
Join Date: May 2018
Location: Goldbar, WA.
Posts: 168
M.O.C. #21854
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Quote:
Originally Posted by BB_TX
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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As I understand it, this is what you're supposed to do with pizza crust. A small amount of one batch is carried forward to the next, in perpetuity.
Obviously this is for smaller scale pizza processing. Also, I may be completely talking out of my behind here.
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2018 3950BR - MORryde X-Factor, Disc Brakes, 3rd AC, Stacked W/D, Winegard Trav'ler (DTV), 2000w inverter, EMS-HW50C
2022 Ford F-450 Limited Diesel Dually - B&W 25k Hitch
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03-24-2023, 11:44 AM
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#11
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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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#12
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Montana Fan
Join Date: Apr 2021
Location: everywhere, USA
Posts: 300
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, 11.5kw 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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#13
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 446
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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#14
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,774
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, 02:03 PM
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#15
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,361
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).
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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03-24-2023, 08:28 PM
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#16
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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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03-25-2023, 08:04 AM
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#17
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Montana Fan
Join Date: Oct 2021
Location: Possum trot
Posts: 132
M.O.C. #29795
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If the DEF at the truck stops was “ bad “ then there would be trucks sitting on the side of the road everywhere. That’s the only place trucks get their DEF. I don’t get mine there because of price,but I would have no problem if need be. If the truck stops were only fueling a couple of trucks a day then I would worry about the DEF. But at a busy one then there’s going to be a constant turn over. They are getting several loads of fuel a day,and probably a tanker load of DEF at least once a week.
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03-29-2023, 02:35 PM
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#18
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Established Member
Join Date: Apr 2019
Location: St. Clair
Posts: 14
M.O.C. #23907
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All fuels and def take their suction from the bottom of the tank. Each liquid has it’s own specific gravity, so it’s not layering like oil and water when new fuel/def is delivered. Tanks also have agitators to alleviate separation. Now, a small percentage of what you get “could” be day one fluid due to mixing. I wouldn’t be too concerned. Stuff that’s on the shelf has a higher probability of getting old. Typically it’s cheaper at the pump as well. I would go for that…
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03-29-2023, 07:25 PM
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#19
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,574
M.O.C. #30417
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DEF is DEF and a bazillion trucker can't be wrong...
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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03-29-2023, 03:11 PM
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#20
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Montana Fan
Join Date: Oct 2017
Location: Tyler
Posts: 193
M.O.C. #20704
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DEF
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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Not trying to be a S.A., but since that is the case, why can't I just use something like ammonia water (?) in the DEF tank ? I will continue to buy DEF at the truck stops - never had an issue - but just wondering .
Max
__________________
Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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