RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-24-2020, 10:49 AM   #1
3 Rivet Member
 
2020 25' Flying Cloud
Knoxville , Tennessee
Join Date: Apr 2020
Posts: 107
Blue Def or at the pump?

At a recent refueling stop I purchased a container of Blue DEF. An employee mentioned I could buy it much cheaper at the pump.

As a new diesel TV owner I need advice on whether to continue buying it as I had been or at the pump.

Thanks!
Gibson3798 is offline   Reply With Quote
Old 10-24-2020, 10:54 AM   #2
2 Rivet Member
 
2018 30' Flying Cloud
Springfield , Ohio
Join Date: Jun 2020
Posts: 56
Blue DEF is about $5.00 per gallon when buying by the box. It's about $3.00 a gallon at the pump and you don't need to handle boxes or worry about spills. It's a pretty easy decision.
tbrowne is offline   Reply With Quote
Old 10-24-2020, 10:58 AM   #3
4 Rivet Member
 
2014 27' Flying Cloud
Wenatchee , Washington
Join Date: May 2014
Posts: 368
Blue Def or at the pump?

I usually refuel at CFN stations (or Pilot/Flying J when towing the AS) so I get my DEF at the pump (and pay for it and the fuel at the end of the month).
__________________
2018 Ram 3500 SLT CTD 4X4 pickup
2014 Airstream Flying Cloud 27FB
WBCCI #7180
21Airstream is offline   Reply With Quote
Old 10-24-2020, 11:01 AM   #4
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 2,628
$10 less and fresher. A little more hassle as pay at the pump rarely works for me at the truck stops.... DEF has a shelf life of 6-9 months at 100F. A year or more at 85, more than 2 years at 45 F.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 10-24-2020, 11:42 AM   #5
Rivet Master
 
2007 27' Safari FB SE
NW Oregon in a nice spot , Oregon
Join Date: Sep 2011
Posts: 570
When I have looked at getting from the pump I have observed that the nozzle will not fit my DEF fill neck.....its too big.
bweybright is offline   Reply With Quote
Old 10-24-2020, 01:43 PM   #6
Is it January yet?
 
jaybauman's Avatar
 
Currently Looking...
2019 30' Flying Cloud
Katy , Texas
Join Date: Apr 2017
Posts: 432
After price, the next best thing about buying at the DEF pump is you can purchase the exact amount you need to fill up your tank.

In and of itself, the age of the DEF isn't as important as what temperatures it has been exposed to. If kept at room temperature, it's good for 2 years. At 95°F, you're looking at a 6-month shelf life. Unless you're desperate, never purchase the boxes that sit in the outside display case at your favorite fuel filling station. You'll be good with anything that's been kept indoors.
__________________
2019 Flying Cloud 30FBB
Bunkhouse is sold...something more "classical" on order!
2020 GMC 3500HD Duramax AT4
ProPride 3P w/ 1400 lb. spring bars
jaybauman is online now   Reply With Quote
Old 10-25-2020, 07:16 AM   #7
2 Rivet Member
 
2018 30' Flying Cloud
Springfield , Ohio
Join Date: Jun 2020
Posts: 56
I'm pretty sure all DEF filler tubes are the same size as are all DEF hose nozzles. The DEF pumps at truck stops are generally next to but separate from the fuel pumps. Look a little closer, I think you must not have been looking at the DEF pump nozzle if you thought it was too large. If you have trouble finding the DEF pump, ask a truck driver. They will be happy to show you where to find it.
tbrowne is offline   Reply With Quote
Old 10-25-2020, 07:58 AM   #8
Rivet Master
 
turk123's Avatar

 
2019 30' Classic
Canfield , Ohio
Join Date: Jul 2015
Posts: 2,228
Quote:
Originally Posted by tbrowne View Post
I'm pretty sure all DEF filler tubes are the same size as are all DEF hose nozzles. The DEF pumps at truck stops are generally next to but separate from the fuel pumps. Look a little closer, I think you must not have been looking at the DEF pump nozzle if you thought it was too large. If you have trouble finding the DEF pump, ask a truck driver. They will be happy to show you where to find it.
I agree. Just be glad it didn't allow you to pump diesel into the DEF tank! When that diesel would hit that extremely hot catalytic burner, whoa!
__________________
x\x/x\x/x\x/x\x/x\101970\x/x\x/x\x/x\x/x\x/x\/x\x/x\x/x
2017 Airstream International Signature 27FB Twin
2019 Airstream Classic 30 Twin
turk123 is offline   Reply With Quote
Old 10-25-2020, 08:28 AM   #9
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 2,628
No excess oxygen in the exhaust so it's not so bad as you think. Still the filler sizes are so different, there is not much chance someone will mess up unless you fill a jug first but I'd hope people would discover it is diesel first. As you all say the def is from a different dispenser on the side of the main pump and the nozzle is usually concealed by a sliding door.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 10-25-2020, 09:02 AM   #10
Rivet Master
 
ITSNO60's Avatar
 
Currently Looking...
Tucson , AZ
Join Date: May 2017
Posts: 988
I have a vehicle that uses about 1 gallon of DEF every 3,000 miles and it holds 3.5 gallons. (My first full tank of DEF went 12,000 miles before the 1,500 mile warning light came on)We see daily temps over 95 better than half the year with much of the summer in triple digits. With my driving lessened by both Covid and retirement I don't think I'll drive it much over 5,000 miles this year so I have been very careful to buy in small quantities with fresh dates.

Last time the light came on I waited for the warning to drop to 600 miles then I only added one gallon. (The dealership was selling bottles that were already a year old!) I have found both Blue DEF and the Wally World DEF on the shelf with dates as recent as one week. The only drawback is possible condensation but with our dry weather and the plastic tank I doubt that will be an issue, and being the solution is mostly water anyway a few drops of condensation shouldn't hurt.

Just something else to consider if your vehicle will not be driven much, or stored for a while. I think some vehicles have an easy way to drain the DEF tank but not so on my TDI.
__________________
Brian
ITSNO60 is offline   Reply With Quote
Old 10-25-2020, 09:05 AM   #11
2 Rivet Member
 
2020 27' Globetrotter
Greater Salt Lake City , Utah
Join Date: Aug 2019
Posts: 31
Blue Def or at the pump?

Quote:
Originally Posted by Gibson3798 View Post
At a recent refueling stop I purchased a container of Blue DEF. An employee mentioned I could buy it much cheaper at the pump.

As a new diesel TV owner I need advice on whether to continue buying it as I had been or at the pump.

Thanks!


Have always purchased DEF from the “big boy” truck pumps and never had an issue with the quality. As noted, the turnover of the fluid is what provides the peace of mind.

Just note it is “high flow” and will fill a 5 or 8 gallon tank very quickly. Squeeze trigger slowly. DEF tanks on the semi’s are much larger given the long hauls they run.
ExploreUT is offline   Reply With Quote
Old 10-25-2020, 09:14 AM   #12
Moderator
 
moosetags's Avatar

 
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach , Florida
Join Date: Jul 2006
Posts: 12,134
Images: 5
Greetings from the Florida Panhandle

I have used DEF since the very beginning. I had a 2011 Duramax (the first year pf DEF). I also had a 2018 Duramax, and I now have a 2020 Duramax. At any fuel stop that has DEF at the pump, i always top-off my DEF tank. It was always much easier, especially when the GM filler was up under the hood.

Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2020 Silverado 2500 (Vivian)
moosetags is offline   Reply With Quote
Old 10-25-2020, 09:21 AM   #13
4 Rivet Member
 
2018 27' Globetrotter
Mooresville , North Carolina
Join Date: Jan 2018
Posts: 445
My ‘18 GMC diesel has the DEF fill under the hood so it’s inconvenient either way. More inconvenient at the truck stops as I have to pull forward enough to pump diesel and then back up enough to reach under the hood.
I carry the blue DEF in a box in the bed of my truck and fill at my leisure at the camp site or my garage.

I usually refill before I get any warning. I carry an empty 1.5 liter wine botttle / a funnel / fill the wine bottle about 7 times and I’m done. More relaxing to me than the truck stops.
__________________
2018 GMC Sierra 2500HD Duramax
Equal-I-zer Weight Distribution attached to the Gen-Y Torsion Flex Weight Distribution Hitch
"Roadrunner"
GOUSC is offline   Reply With Quote
Old 10-25-2020, 09:26 AM   #14
Moderator
 
moosetags's Avatar

 
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach , Florida
Join Date: Jul 2006
Posts: 12,134
Images: 5
What a pleasant difference now that the 2020GM fills at the fuel door. I traded the 2018 for a 2020 primarily to get the camera feature, but the DEF filler issue is just as much of a plus.

Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2020 Silverado 2500 (Vivian)
moosetags is offline   Reply With Quote
Old 10-25-2020, 10:21 AM   #15
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 2,628
DEF is a solution of urea and water and degrades to ammonia which is not very effective at controlling NOx. So old DEF won't harm the exhaust system, it just won't control pollution very well.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 10-25-2020, 10:24 AM   #16
3 Rivet Member
 
2020 25' Flying Cloud
Knoxville , Tennessee
Join Date: Apr 2020
Posts: 107
Great advice, so thanks to all!
Gibson3798 is offline   Reply With Quote
Old 10-25-2020, 10:47 AM   #17
4 Rivet Member
 
2018 27' Globetrotter
Mooresville , North Carolina
Join Date: Jan 2018
Posts: 445
Quote:
Originally Posted by moosetags View Post
What a pleasant difference now that the 2020GM fills at the fuel door. I traded the 2018 for a 2020 primarily to get the camera feature, but the DEF filler issue is just as much of a plus.

Brian
I’m jealous😀
__________________
2018 GMC Sierra 2500HD Duramax
Equal-I-zer Weight Distribution attached to the Gen-Y Torsion Flex Weight Distribution Hitch
"Roadrunner"
GOUSC is offline   Reply With Quote
Old 10-25-2020, 10:57 AM   #18
Rivet Master
 
ITSNO60's Avatar
 
Currently Looking...
Tucson , AZ
Join Date: May 2017
Posts: 988
Quote:
Originally Posted by BayouBiker View Post
DEF is a solution of urea and water and degrades to ammonia which is not very effective at controlling NOx. So old DEF won't harm the exhaust system, it just won't control pollution very well.
I do believe that old DEF can cause issues with the reductant injector, and possibly the pump, sensor and feed line due to crystallization. SCR is fairly new to me (I held out as long as I could) so I am just learning but from what I have read I came to that conclusion. These are somewhat common failures on the VW buyback cars that sat in storage for 1-2 years.
__________________
Brian
ITSNO60 is offline   Reply With Quote
Old 10-25-2020, 11:08 AM   #19
2 Rivet Member
 
2018 26' Flying Cloud
WARNER ROBINS , GA
Join Date: May 2016
Posts: 71
I like the pilot or flying j def. the date codes are easier to interpret. Plain date codes. No cryptic crap.
jrwayne is offline   Reply With Quote
Old 10-25-2020, 11:16 AM   #20
Rivet Master
 
Rgentum's Avatar
 
2016 27' Flying Cloud
Olympia , Washington
Join Date: Nov 2015
Posts: 575
Hey, guys & gals, let's get real.

Diesel Exhaust Fluid (DEF) is an aqueous solution of urea, also known as carbamide. Urea is a remarkably simply compound; there's nothing complicated about it: two amide groups (NH2) joined by a carbonyl (C=O).

Biologically, it is the most common nitrogenous degradation product of protein metabolism and the most common compound in urine. In mammals, the liver combines two ammonia groups (NH3) with carbon dioxide (CO2) to make urea (CO(NH2)2). Chemically, it is produced synthetically and is the most common nitrogen-containing fertilizer used in agriculture. If you want to make a chemical compound containing nitrogen, urea is the usual source.

https://en.wikipedia.org/wiki/Urea

Exhaust gases contain nitrogen dioxide (NO2), which is a strong oxidant. In the atmosphere, NO2 can cause irritation of eyes, nose and throat and when inhaled can cause lung irritations and decreased lung function.

When DEF is sprayed into exhaust gases, the urea in DEF combines with NO2 to produce pure Nitrogen (N) and water (H2O), both of which are common ingredients of the air we breath, and neither of which is toxic, as is NO2.

The point I'm wanting to make is that urea is urea, and there is nothing fancy about it. Consequently, there is little if any point in wanting to buy "expensive" DEF. DEF typically comes in 2.5 gallon boxes. WalMart sells its generic DEF for approximately $8, which is $8/2.5 = $3.20/gallon, which is comparable if a little more than DEF costs "at the pump." And I find it more convenient to buy DEF in a box than at a truck stop, where I typically find the cost of diesel substantially more than at a typical service station and particularly at Costco.
__________________
Alta & Richard, Olympia, WA --- WBCCI 8873
"Aurum": 2018 Ram/Cummins 3500
"Argentum": 2016 AS FC 27 FB
"BigDog": M Harlequin Great Dane, 150 lb
WL7Z --- NAUI --- WSBA
Rgentum is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel/DEF mileage. ROBERTSUNRUS Tow Vehicles 28 03-19-2014 12:47 PM
DEF Fluid eliasurbina Sprinter and B-van Forum 8 11-23-2013 12:29 PM
Def aa9zz Sprinter and B-van Forum 4 10-04-2013 12:34 AM
Diesel Exhaust Fluid (DEF) Brentsouth Sprinter and B-van Forum 17 04-13-2013 03:18 PM
Hi-Def on the road????? FlaAirstream Full-Timing 2 11-26-2007 07:30 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 08:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.