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Old 09-13-2015, 09:55 PM   #15
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DEF is nothing more than the tree-hugging EPA attacking diesel engines to make them more expensive to operate and get lower MPG figures.
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Old 09-13-2015, 11:04 PM   #16
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Originally Posted by Camper Ken View Post
My new Itasca Navion (Mercedes Sprinter chassis) uses DEF. I'm new to having a diesel but adding DEF every so often doesn't seem that "complex". Is there something I'm not aware of? I know this discussion is more about diesel pusher class A's, but I'm curious about the negative attitude about DEF, reducing emissions, smoke and smell of a diesel.

The negatives I have seen over and over on these forums involves systems problems. Sensor issues and trips to dealerships. I'm sure you have already discovered that there are not many service providers that will deal with that Mercedes diesel other than Mercedes dealers. Many of them would prefer not to have to deal with RVs. It's no big deal when it works but it gets to be a big deal when it doesn't.

I have an '03 diesel. No smoke and almost no smell. I'm afraid the law of Diminishing returns is alive and well at the EPA.


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Old 09-14-2015, 06:29 AM   #17
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The negatives I have seen over and over on these forums involves systems problems. Sensor issues and trips to dealerships. I'm sure you have already discovered that there are not many service providers that will deal with that Mercedes diesel other than Mercedes dealers. Many of them would prefer not to have to deal with RVs. It's no big deal when it works but it gets to be a big deal when it doesn't.

I have an '03 diesel. No smoke and almost no smell. I'm afraid the law of Diminishing returns is alive and well at the EPA.


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Here is a post from an on going thread that I just read this morning. The motorhome is a 2014 Newmar Mountainair:

Mine has a 180 degree T-stat I know this for a fact as this is one of the first things Cummins changed thinking my original 180 T-stat was either stuck open or opening too soon, neither of which was correct.....FWIW, also in testing the time line engagement of the high speed lock up by disconnecting from 12V, the average time to full lock up was a timed 67-72 seconds...also throw into the mix that Horton, (the mfg. of the clutch fan and controller) and FL have told to me personally at least 4 or 5 different versions of how these parts function and why, so you can take your pick....OBTW, I have also asked FL, supplier of the cooling system why a higher thermostat is not used and have never got an answer, other than "it just doesn't work that way"....I have made a formal e-mail request to FL engineering to explain to me why it does not work this way....we shall see if they answer....I am to have a Cummins tech do a regen and engine parameters log , this after 600+ miles since the last one (more than 10 of these regens have been done in the last six weeks), both Cummins and FL are to review this....Newmar has been notified of this fiasco, and if I do not get a satisfied answer to this tomorrow they will intervene, whatever that means.


If you watch the current posts on these forums, you will come to understand that if you have DPF and DEF, there is a high probability of problems that may be hard to resolve.




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Old 01-08-2016, 07:48 AM   #18
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I would definitely search for a newer DEF engine, runs better and gets better fuel mileage and is cleaner. Improved technology.
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