The process of injecting urea into the exhaust stream is called SCR or Selective Caralytic Reduction. It's been used in OTR vehicles since back in 2010 on the larger trucks and worked it's way down to the smaller trucks like the F450's, etc starting, I believe, this year. As for the dilution rate it is established by the MFG for their machine but I can assure you it will be MUCH GREATER of a dilition rate than the 1 to 5 you mentioned. Below is a link that will tell you alot about the newest technology.....
Basically it's just something else for our nannies in DC to force down out throats with no real thought to the problems it can cause for the end user. For example if you live in a really cold climate your now going to have to keep the DEF in your tractor warm during the winter or it wil freeze up. Too I have heard rumors of other problems with things like the particulate filters and their burn off cycles, etc, etc. That said I can't recall exactly the various problems I've heard discussed by the guys driving OTR vehicles with the new systems, and I haven't driven one myself, so I won't say any more about them right now.
Basically though it's just another PITA expense for the avarage man to have to deal with, and pay for. Right along with the expenses and rising costs of everything else........Just makes you want to crawl into a hole somewhere and curl up and pray it all goes away......
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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