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Old 04-03-2013, 02:20 PM   #1
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Diesel Fuel Additive for Emissions Reduction - What the heck is this stuff called?

We purchased a 2013 Winnebago Tour and need to buy that additive to go in the gas pursuant to the new emissions control on newer diesel RV's. We had a 2007 before, so didn't have the additive.

What is it called and where can I get it? I am assuming maybe the gas station or at Camp World or similar camp store?
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Old 04-03-2013, 02:23 PM   #2
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It's called DEF and you can get it at the pump at most FlyingJ stations and other truck stops when you get diesel.
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Old 04-03-2013, 02:25 PM   #3
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Great, thanks about the name. i don't want to sound like an idiot when i walk in and ask for something that I don't even know what it is called!

Does it come in gallon type containers? I want to make sure I have some spare. The "instructor" for our new coach scared us into making sure we always have some on hand because the coach basically stops running if it runs out of this additive.
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Old 04-03-2013, 02:28 PM   #4
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We ... need to buy that additive to go in the gas.
It's called DEF - Diesel Exhaust Fluid. It's an aqueous urea solution - urea and distilled water. CAUTION: It does NOT go in the fuel tank with the diesel fuel. There is a separate DEF tank that you fill as required.

If you refuel at the truck islands of a truck stop, most now have DEF pumps with the diesel fuel pumps. I believe you can also get jugs of DEF at auto parts stores, Tractor Supply, etc.

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Old 04-03-2013, 02:32 PM   #5
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You can also get it at Walmart in 2 or 2 1/2 gal container. Goes in separate tank, not in fuel tank.
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Old 04-03-2013, 02:35 PM   #6
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Yes, did know that it goes in a separate tank. We have a gauge too on the dash that tells us how much is left. I will check out a place to buy an extra jug. Now that I know what it is called, found one on-line that sells it in 2.5 gallon container. Just want to make sure we keep an extra supply of it just in case.

Thanks so much.
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Old 04-03-2013, 02:45 PM   #7
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Just be aware that DEF at the pump is about $2.79 a gallon. A 2.5 gallon jug costs $14.00 or more. Don't know what chassis you have, but my Freightliner holds about 10 gallons. If you start looking at half a tank, you have thousands of miles to find it and it is available at most truck stops out of the pump. Just know you will pay twice as much in the jugs.
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Old 04-03-2013, 03:02 PM   #8
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Thank you for that input. I just want to have a jug on hand, in case of an emergency, but will definitely try to plan to refill it when needed at the pump. I did just find it at the auto Zone in either 1 gallon or 2.5 gallon jugs. That will be our "in case of emergency" supply on hand. For anyone else wanting to do the same, it is called Blue DEF. I am not sure the size of our tank for this. I am assuming it is big since everything about our Tour seems to be big!! lol
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Old 04-03-2013, 06:26 PM   #9
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Originally Posted by JewelMcD
Thank you for that input. I just want to have a jug on hand, in case of an emergency, but will definitely try to plan to refill it when needed at the pump. I did just find it at the auto Zone in either 1 gallon or 2.5 gallon jugs. That will be our "in case of emergency" supply on hand. For anyone else wanting to do the same, it is called Blue DEF. I am not sure the size of our tank for this. I am assuming it is big since everything about our Tour seems to be big!! lol
I too carry one 2 1/2 gallon jug of Peak Blue DEF. I was really surprised how little DEF the coach uses and happy to see every Walmart between Bangor Maine and Titusville, Florida we have visited this last year has it in stock. I have read that DEF does have a shelf life, so I decided not to stock up on the stuff, but buy it when I need it.

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Old 04-03-2013, 07:48 PM   #10
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DEF is urea (NH3) and distilled water. It is used to react with the exhaust and catalyst to reduce the NoX emissions from the engine.

10 gallons will last many of thousands of miles. And as noted it is much less expensive to buy it at the fuel depots.

Ken
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Old 04-03-2013, 07:57 PM   #11
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I bought a back-up gallon today at Auto Zone. The guy that helped me said the urea is cow urine!! I haven't looked it up yet to verify, but thought that was interesting trivia.
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Old 04-03-2013, 08:05 PM   #12
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I paid about $10.00 for 2 1/2 gal jugs with nifty little pour spout. Haven't figured out to get DEF at the pump to the right rear compartment on motorhome without holding up the line at diesel pump. Says not to reuse containers, but don't know why. As far as clean burning, I've run the diesel inside my building on start up, it's not obnoxious but rather a sweet smell and super clean!
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Old 04-03-2013, 08:22 PM   #13
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I bought a back-up gallon today at Auto Zone. The guy that helped me said the urea is cow urine!! I haven't looked it up yet to verify, but thought that was interesting trivia.
As stated twice above, DEF is urea [CO(NH2)2] and distilled water. Urea is made in a fertilizer plant that makes ammonia-based fertilizer.

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Old 04-03-2013, 11:29 PM   #14
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I bought a back-up gallon today at Auto Zone. The guy that helped me said the urea is cow urine!!
Personally, I like the idea of "collectors" with plastic jugs following the cows around in the pastures. It would make a great spectator sport!
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