DEF.....what are you using
Cargo Master
Joined: Dec 2003
Posts: 2,290
Likes: 2,037
From: Central MO
Most of my driving is short trips (except when I'm towing) so I wonder if I would use less DEF due to the engine rarely reaching full temp. I know it's worse on the DPF with short trips but maybe better on DEF?
Freshman User
Joined: Aug 2016
Posts: 26
Likes: 0
I just bought my first Diesel SD and this is my first experience with DEF. Because I use mine primarily for a camper, I bought a gallon to have just in case I run out someplace. Not sure that was a great idea if it can degrade over time.
Should I even bother doing that? Is it generally available where you buy fuel?
Should I even bother doing that? Is it generally available where you buy fuel?
Cargo Master
Joined: Dec 2003
Posts: 2,290
Likes: 2,037
From: Central MO
I just bought my first Diesel SD and this is my first experience with DEF. Because I use mine primarily for a camper, I bought a gallon to have just in case I run out someplace. Not sure that was a great idea if it can degrade over time.
Should I even bother doing that? Is it generally available where you buy fuel?
Should I even bother doing that? Is it generally available where you buy fuel?
Thread Starter
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Tuned
Joined: May 2009
Posts: 321
Likes: 4
Ok, so Walmart DEF is registered with the API, therefor it meets ISO 22241, which means it is 32.5% Urea, and the rest is de-ionized water. Good, since that is what the filler cap says to use.
additionally, def degrades when exposed to high temperatures, and the Urea crystallizes.
My days worth of research.......
additionally, def degrades when exposed to high temperatures, and the Urea crystallizes.
My days worth of research.......
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Junior User
Joined: Aug 2016
Posts: 55
Likes: 0
I bought the service plan with oil change each 5,000 miles. With a diesel, the service plan seems to be a no-brainer. Was in today for first oil change at 5,000 miles and they filled the def. I didn't realize that was included in the service plan and maybe they just did it as a courtesy. But if they fill the def at each 5,000 mile oil change, I will never buy def.
Senior User
Joined: Feb 2007
Posts: 495
Likes: 6
From: Snohomish, WA
After a hard night of drinking . . .
Over the toilet at the first place I drove tractor trailers:
"All drivers with short stacks and/or low manifold pressure, please pull your rig up closer."
Over the toilet at the first place I drove tractor trailers:
"All drivers with short stacks and/or low manifold pressure, please pull your rig up closer."
Laughing Gas
Joined: May 2015
Posts: 1,117
Likes: 2
From: Hatfield's side of river
While I agree for the most part that DEF is DEF, that statement is true if you drive a Ford or Ram. My Buddy has a new GMC. He put Walmart DEF in his truck and ended up in the Service Department over it. The tech to drain the DEF tank and refill it with GM brand DEF. Turns out that with the GM trucks you have to run GM DEF ONLY. He feels that GM is taking advantage of their customers by doing this as its expensive. It wasn't considered a warranty claim either so he had to pay for the service.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,613
Likes: 156
While I agree for the most part that DEF is DEF, that statement is true if you drive a Ford or Ram. My Buddy has a new GMC. He put Walmart DEF in his truck and ended up in the Service Department over it. The tech to drain the DEF tank and refill it with GM brand DEF. Turns out that with the GM trucks you have to run GM DEF ONLY. He feels that GM is taking advantage of their customers by doing this as its expensive. It wasn't considered a warranty claim either so he had to pay for the service.
Hotshot
Joined: Apr 2013
Posts: 10,118
Likes: 650
From: NH
I agree. There are only two ingredients in DEF, and it must be precisely the same mix every time: 32.5% urea (ammonia mix) and 67.5% deionized water. An aftermarket version should be 100% identical to an OEM version. Its possible the WalMart stuff was outdated or something like that, but you can run any brand of DEF in any diesel engine that requires it, regardless of Ford, RAM, GM, Freightliner, Kenworth, John-Deere, you name it. That's why they sell it at the pump in many areas now.
Postmaster
Joined: Jul 2015
Posts: 4,392
Likes: 22
From: very South Texas
Please forgive me.. non diesel owner... but very interested for possible future purchase.
reading the Ford DEF system.. design description..
Towing uses Less DEF as cylinder Heads reach a higher temperature and needs Less DEF... for cleaning.
or do I have it wrong???
reading the Ford DEF system.. design description..
Towing uses Less DEF as cylinder Heads reach a higher temperature and needs Less DEF... for cleaning.
or do I have it wrong???