DEF usage ?

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JRG18

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2015
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Needle shows 3/4 tank. I bought it in January and have driven about 2200 miles.
 

jadocs

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The harder you work it the more you will use. It really doesn't have much to do with mileage.
 

travelingrambo

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FUL TIME RVERS
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2015
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cummins 6.7
I just bought a 2105 ram 3500 duelly 6.7 cummins. The first 2000 miles i ues about 1/4 tank of def. I then towed my 16000 lb fifth wheel 1800 miles. I used about 8 gallons of def and mileage averaged about 9 mpg. The truck has 30000 miles on it. Is this reasonable usage and mileage? My dealer in texas seemed to think this was normal usage.
 

MyTruck

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I have a RV trailer weighing at around 8K lbs when fully loaded with water and camping stuff. I just drove from Oregon to California and I went through about 1/8 of DEF.

Carlo
 

powerfulz

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My usage

When I ordered my M16 ram 6.7 l, Aisin, 3.73, I was told DEF refill should be same as oil interval. Well I was uneducated at the time. I put 700 miles unloaded on the truck the DEF guage never moved. Then I hooked to my 40ft triple axle toy hauler loaded with 900lb water, two 1900cc motorcycles and supplies the guage broke full in 200 miles. By the time I made my 900 mile trip guage was on red... Woah.... So upon research of the SCR system newer diesels have. Seems DEF is added at around 2.5% of fuel consumption to convert NOx into nitrogen and vapor in the exhaust system... Its a wild chemesty lesson but looks like if u are hauling weight you're going to burn DEF noticeably..
 

RV Trax

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Panama City Beach, Florida
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2015
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6.7 Cummins Diesel
My new 2015 Ram 3500 Dually was using about 1 gallon every 1000 miles when towing 12000 Lbs. for the first 11,500 miles. Then on a trip it did not use any. About 12000 miles the check engine light came on. Message showin limp mode in 200 miles. Brought to dealee and warranty replacement of the Particulate filter (Cat.) Dealer removed the ammonia sensor and flashed the computer. Left and the next 600 plus miles, still no movement of the DEF gauge. Fuel milage increased to over 24 MPG unloaded highway including over 250 miles towing in town. Did not worry about the DEF, till the gauge went crazy and a soot cooker light came on and a message that it would go into limp mode again. Brought back to another dealer and was told the DEF pump would need to be replaced warranty. Still no gauge movement in 600 towing miles, including highway. Pretty sure I still have a problem. While I was at the dealer for warranty, a customer came in with a 2014 3500 Ram with 44,000 miles. Said he has had 3 Particulate filters and was there for his fourth pump. I now understan why the 2016 Rams only have a 60,000 mile warranty instead of the 100,000 warranty. Sounds like a DEF and EGR delete may be in order to turn this emissions basket into a reliable vehicle. :superhack:
 

jk6672

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Diesel
Speaking of DEF, which brand do you guys use? A buddy of mine also has a 3500, and he said I better us Ultrapure or I'm asking for problems. He said his system needed to be replaced because he didn't use Ultrapure from the get go.
 

homebrew

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Cummins
7000 miles on my truck and I've gone through about a tank and a half.
 

Nicky Biscuits

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Speaking of DEF, which brand do you guys use? A buddy of mine also has a 3500, and he said I better us Ultrapure or I'm asking for problems. He said his system needed to be replaced because he didn't use Ultrapure from the get go.[/QUOTE ]

I dont think it matters all that much as long as you dont use the dollar store brand. lol. Just make sure your at the iso standard - have a urea concentration of 32.5%
 

ACJCF2

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2018 3500 Tradesman CC DRW 4X4
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Cummins 6.7L (408 cid) TD
When I was working at O'Reilly Auto Parts, I sold a lot of Peak Blue DEF, especially when it went on sale 2/$25. (Currently 2/$26). Also sold O'Reilly brand to several customers. Never heard of a complaint with either. I had three years behind the counter. When i took delivery of out 3500, it had half a tank of DEF and the dealer through in a 2.5 gal jug. I did one 300 mile camping trip during Dorian (waste of time & $) and it barely moved. Topped it off for the scheduled trip the following week and used less than a 1/4 tank in 700 miles. Still breaking in I guess.
 

Gr8bawana

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When I was working at O'Reilly Auto Parts, I sold a lot of Peak Blue DEF, especially when it went on sale 2/$25. (Currently 2/$26). Also sold O'Reilly brand to several customers. Never heard of a complaint with either. I had three years behind the counter. When i took delivery of out 3500, it had half a tank of DEF and the dealer through in a 2.5 gal jug. I did one 300 mile camping trip during Dorian (waste of time & $) and it barely moved. Topped it off for the scheduled trip the following week and used less than a 1/4 tank in 700 miles. Still breaking in I guess.
My 2500 CTD has 39,000 miles on it now. Just over 5,000 since I bought it with about 1,000 miles of towing and I might have used about 4 gallons. I was apprehensive about DEF usage before I bought a diesel but it is really a non-issue.
 

OLEJOE

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2022
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6.7 CTD
I got my 2500 CTD in September and first 1500 miles the DEF gauge didn’t move. When the engine is turned off after running it you can hear the DEF pump cycle. I pulled my 5K TT 300 miles and the gauge finally moved. The ECM has sensors in the particulate filter that check for back pressure and percentage of blockage. When it reaches the right temperature and blockage is high enough it will regen. Excessive idling, light loads and the condition of the engine determines how often and how long it regens. The brand of motor oil and weight is a major factor also. The company I retired from had major issues when this first came out. If the engine has oil consumption issues, even minutely, it will have regen problems. Ditto for coolant leakage internally. I’ve been dealing with this since 2008 when it started for class 8’s.
 
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