Govt Diesel Emissions Standards & RV’s

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I just returned from the Pennsylvania trade/public RECREATIONAL VEHICLE show and while taking a look at a new motorhome on a Freightliner Personalized Chassis I noticed precisely what looked to be the small fuel aquarium based under one of typically the exterior storage area entry doors. Typically the cap on often the tank had the albhabets (DEF) which usually My spouse and i later on discovered means Diesel Wear out Fluid. My spouse and i had little idea what Diesel powered Tire out Fluid was, so I advancing over to the Freightliner display to find out and about. The Freightliner representative was incredibly experienced and helpful in explaining just what OUTL was, and after coming back again home I decided in order to research it a touch further.

It turns outside OUTL was a effect from the latest coup of EPA mandates upon diesel powered engine emissions expectations. These EPA mandates about diesel engine emissions have a new longer history. For over dieselgate compensation PROTECTION AGENCY has aggressively elevated stringent diesel engine exhaust emissions criteria on manufacturers, most notably at the areas of Particulate Make any difference (PM) and oxides regarding nitrogen (NOx). These types of tire out emissions are by-products from the combustion (or unfinished combustion) of diesel gasoline. Consider the PM like the soot or smoke cigarettes you see released by the exhaust system. Oxides regarding nitrogen result coming from a bad reaction between nitrogen and o2 around the high temperatures designed by the combustion procedure.

In 2050 the EPA signed exhausts standards directed at PM emissions, made to take full impact by the release connected with 07 model year vehicles. That brings us backside to DEF as well as the new year ENVIRONMENTAL PROTECTION AGENCY mandates, intended to lower the amounts of nitrous oxide emissions released into typically the atmosphere.

As far since the RV Market runs all but one Stock Manufacturer (OEM) chose some sort of method called Selective Catalytic Elimination or perhaps (SCR) to be able to meet this new EPA common. Simply placed SCR offers some sort of Diesel-engined Exhaust Smooth and a cause the fact that is designed to take out additional PM HOURS and emissions from the diesel-engined combustion process.

Pros as well as Disadvantages of SCR

So what does all of this mean towards the new diesel RV user?


1) SCR will give you 5% to 8% much better fuel economy.

2) More revolt & power compared to an identical 07 motor with Wear out Gasoline Recirculation (EGR) technology.


1) The owner will likely need to keep the DEF tank capped off. The phrase is that DEF are going to be abundantly accessible from travel centers & parts stores.

2) It is definitely possible for that DEF option, made up of two-thirds part water, to deep freeze. The word is often the DEF fish tank is covered and the technique works by using heated lines to deliver this fluid to help prevent freezing.

3) DEF can easily degrade, but it would likely carry 125 degrees involving direct heating over a period of time, and that is unlikely to possibly transpire.

4) If for virtually any factor you do not fill the OUTL fish tank and you run outside often the engine will lessen speed to approximately 25 reader board until more DEF can be added to often the system again. There are gauges in the coach that will alert you in the required time to refill the tank before it runs dried out.

5) Increased cost. The brand new technology is sure in order to affect prices, but typically the jury is out with whether the projected elevated petrol economy will balance out the increase in price over a new time frame.

So enjoy it or certainly not, this kind of is the method associated with choice being employed by typically the majority of RV manufacturer’s to meet or go beyond typically the 2010 EPA diesel powered exhausts standards.

What’s up coming?

Incomparable the next spherical of EPA mandates. At this point that the exhaust system arriving out of the tailpipe may well be cleaner than exactly what is going to the take in (in many regions of often the country) we need to splint ourselves for just what is following. It appearances like the next govt permitted EPA and US DOT mandates are aimed in increased gas efficiency and Green house Gas (GHG) emissions. These types of new diesel emissions specifications will be took inside between 2014 and 2018.

The new standards getting included are sure to dramatically increase the expense of a diesel powered motorhome again, and the problem begs will the ends justify the particular means?

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