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DEF Diesel additive? #1462516 07/03/13 08:17 PM 07/03/13 08:17 PM
Joined: Jan 2003 Posts: 12,405 Southern, Ca. 69DartGT OP moparts member
69DartGT OP moparts member Joined: Jan 2003 Posts: 12,405 Southern, Ca.	I know its not a fuel additive and is used to keep the cat convertor clean but is it used only in large 18 wheeler type trucks or are there some late model cars and trucks that have a DEF tank?

Re: DEF Diesel additive? [Re: 69DartGT] #1462517 07/03/13 08:22 PM 07/03/13 08:22 PM
Joined: Aug 2011 Posts: 122 Pennsylvania moparmaniac07 member
moparmaniac07 member Joined: Aug 2011 Posts: 122 Pennsylvania	All new diesel pickups have it and a few cars do as well. I don't know which cars, but a few diesel cars do require DEF.

Re: DEF Diesel additive? [Re: moparmaniac07] #1462518 07/03/13 08:37 PM 07/03/13 08:37 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Mercedes diesels use it. Maybe VW also. It is basically a solution of urea (fertilizer) and water.

Re: DEF Diesel additive? [Re: ahy] #1462519 07/03/13 09:06 PM 07/03/13 09:06 PM
Joined: Dec 2005 Posts: 586 UP F finn mopar
finn mopar F Joined: Dec 2005 Posts: 586 UP	It's actually an 11% ammonia and distilled water mix, if I recall. Problem is commercial (neat) ammonia sometimes isn't pure enough to use without building crystal deposits on the injector and substrate. We used to mix our own in the lab. Cost $0.11/gallon to make.

Re: DEF Diesel additive? [Re: finn] #1462520 07/03/13 10:55 PM 07/03/13 10:55 PM
Joined: Nov 2007 Posts: 21,813 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,813 Kirkland, Washington	Quote: It's actually an 11% ammonia and distilled water mix, if I recall. Problem is commercial (neat) ammonia sometimes isn't pure enough to use without building crystal deposits on the injector and substrate. We used to mix our own in the lab. Cost $0.11/gallon to make. Kinda sorta. Diesel Exhaust Fluid is really 1/3 urea (a nitrogen compound that TURNS to ammonia when heated) and 2/3 distilled/deionized water. When injected into the exhaust stream (think "after treatment") into a catalytic converter-type burner it very effectively consumes harmful oxides of nitrogen from the exhaust. The beauty of this system, while cumbersome, is that it's an AFTERTREATMENT approach. Why do I stress this? Simple--the engine doesn't know it's there. Period. What does that mean? Simple--the engine can be tuned for max mpg and power without regard to oxides of nitrogen. That's a beautiful thing.

Re: DEF Diesel additive? [Re: Pacnorthcuda] #1462521 07/04/13 10:48 AM 07/04/13 10:48 AM
Joined: Jan 2003 Posts: 12,405 Southern, Ca. 69DartGT OP moparts member
69DartGT OP moparts member Joined: Jan 2003 Posts: 12,405 Southern, Ca.	Thanks, my son in law just dropped two 5 gal cans off while delivering a new Kenworth, trying to see who I can give this stuff to.

Re: DEF Diesel additive? [Re: 69DartGT] #1462522 07/04/13 01:03 PM 07/04/13 01:03 PM
Joined: Jan 2003 Posts: 43,507 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,507 Round Lake Beach, Illinoisy	$2.69/gallon more you have to add to your diesel truck, I will never buy a new truck due to that and the less fuel mileage you get with the new ones. If I can keep my Cummins trucks running that is... The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: DEF Diesel additive? [Re: Rhinodart] #1462523 07/04/13 05:14 PM 07/04/13 05:14 PM
Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN R Rug_Trucker I Live Here
Rug_Trucker I Live Here R Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN	The DD15 Detroits we run at work in the Freightliner Cascadias get 7-10mpg depending on how heavy you are hauling. "The only thing to do for triumph of evil is for good men to do nothing" "NUNQUAM NON PARATUS!"

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