I see a lot of people are wanting to know some stuff about Urea, SCR, and DPF in the new trucks. I am a student at a Johnston Community College in NC I grauate in May and We have had numerous seminars on this stuff. Here goes.
The fluid is definiltly the way to go. It is far better than a DPF and EGR alone. The fluid is going to be injected AFTER the DPF in 18 wheelers. I dont know about pickups. It causes a chemical reaction with the ash and burned diesel fuel created during combustion. It causes a chemical reaction and emits nitrogen and water vapor ONLY. It reduces black smoke and causes a cleaner exhaust. All the big manufactures (detroit, cummins, mack, volvo, paccar) all have had trucks in testing since 2003. (The most recent test (since 07) they have reported NO regenerations in over 90,000 miles.) They have been tested by walmart, UPS, fedex, etc. all the big guys. International is not jumping on the SCR (selective catalyst reduction) bangwagon. They have opted to have dual egr's, dual egr coolers, dual VGT turbos. They have a good design but Fuel economy isnt going to pick up like the SCR trucks. They are saying at least a mile per gallon increase in over the road long distance trucks. Also they are going to have a tank with approx. 10% total fuel capacity. A truck can fill up in California drive to NC and if it was possible drive almost half way to europe and back to California and not have to fill the UREA tank. The DEF (diesel exhaust fluid) does freeze at about 12* F.( so DEF tanks are plastic) This in mind they have routed coolant lines to the holding tank to keep it warm. The fill neck also has a magnet in it to open the valve at the fill pump. If you pull out while filling it will cut off spilling about an ounce. (if you use a gallon can you will need a funnel i assume) The fill neck is 5/8" instead of 1" or 1.25" like the fuel. You can not fill the tank with anything but urea. It is dumb to try to "fool" the system. The truck will run without it in the tank but not for long. It gives lights, warnings to tell you to fill it. On big trucks it derates power and max 55 mph until you fill it. If you fill it it clears the codes full power is returned. If you choose to not fill it and run at derate to a stop and cut the truck off, thats it. You have to call a dealer to clear codes and fill tank to restore power.
Urea is not flammable, corrosive, or toxic. Its has an ammonia smell so pets wont bother it either. The stuff has a PH level of 9, the same as baking soda. For those that slept during chemistry, PH 0 is battery acid, a Coke is about PH 3 or 4, water is 7. PH 14 is bleach.
Now the cost: you can buy it in 1 gallon, 2.5 gallon, 55 gallon drum, 275 gallon drum. The cost will vary. REMEMBER IT IS ALL MADE BY BRENNTAG AND DISTRIBUTED BY TERRA!!!!! They are it. ALL UREA IS CREATED EQUAL IF IT HAS THE API (american petroleum institute) LOGO!!! At a BMW dealership it cost about $15.00 a gallon. Walmart pays $1.23 a gallon but they probally buy 1000 gallons at the time. It does have a shelf life but it is at least a year if not longer. Temperature is crutial. Every truck stop will haev it soon. (Flying J, Iowa 40 franchises, any nation wide truck stop already have it.) It is widely available so the I cant find it excuse doesnt work.
The 6.7 powerstroke according to my dealership will run approx. 7500-10000 miles on a full urea tank. LARGELY DEPENDS ON USE OF TRUCK. (TOWN DRIVER versus ALL HIGHWAY HOTSHOTTER or RV TOWER)
Im sorry its so long but i figured i would let on my knowledge.
For more facts about SCR go to: Facts About SCR
Last edited by smokin95psd; 02-19-2010 at 03:33 AM.