Seven Motorhome OEM’s Tout SCR Engines

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November 17, 2010 by   1 Comment

Editor’s Note: Seven U.S. motorhome builders will be circulating the following letter over the next few weeks in support of Selective Catalytic Reduction (SCR) technology, one popular answer to the Environmental Protection Agency’s stringent 2010 diesel emissions standards. The letter, we’re told, will also be available at the 48th Annual National RV Trade Show, Nov. 30 to Dec. 2 in Louisville, Ky., from the manufacturers as well as their chassis supplier, Freightliner Custom Chassis Corp.


Dear Business Partners and Customers:

During the past decade, the Environmental Protection Agency (EPA) has focused its efforts on reducing the amount of emissions diesel engines release into the atmosphere to achieve cleaner air and a cleaner environment. OEMs, working with the EPA, have risen to the challenge, developing engines that emit nearly zero emissions. The most recent, and for now, the final round of regulations went into effect Jan. 1, 2010, requiring engine manufacturers to implement solutions to significantly reduce the ejection of soot, ash and nitrous oxide (NOx) into the air.

To meet the new requirements, the majority of engine manufacturers – in fact, all but one – have chosen Selective Catalytic Reduction (SCR) technology. Why did we choose it for production in our motorhomes? Because SCR technology is simple, clean and reliable.

Unfortunately, the sole manufacturer utilizing Advanced EGR technology, which is not yet available on the RV market nor a proven technology, has created confusion for the industry by misrepresenting the truth about SCR.

Let’s let the facts speak for themselves.

Fact: SCR works. Prior to release, SCR clocked more than 30 million test miles in the U.S. Furthermore, more than 600,000 trucks and RVs running hundreds of millions of miles in Europe currently utilize SCR to meet the European standards.

Fact: SCR delivers better fuel economy. Customers can expect up to 6% better fuel economy with SCR-equipped 2010 engines versus EPA 2007 engines. We expect further improvements compared with engines equipped with Advanced EGR, and we look forward to the day that they are available to test against.

Fact: Diesel Exhaust Fluid (DEF) is readily available and at a cost equal to diesel fuel. The average RV owner, travelling about 10,000 miles in a given year, would only need to refill the DEF tank about three times. The fluid is available at auto part stores, filling stations and travel centers across the country. And refilling the tank is as quick and easy as refilling windshield wiper fluid. An in-cab gauge will repeatedly alert the driver well in advance of when a refill is needed. If the driver chooses to ignore the multiple warnings, the engine will gradually and safely derate.

Fact: SCR improves driver satisfaction. SCR-equipped engines have better horsepower and torque with the same packaging as the EPA 2007 version.

The facts are all there. SCR is the best option on the market, which is why we have chosen it as the right solution for our customers. The ultimate choice is yours. However, if you focus only on the facts, the best choice should be apparent.


Michael R. Terlep, president of Coachmen RV
Jim Jacobs, general manager of Entegra Coach
John Cunningham, general manager of Forest River
Dick Parks, Newmar CEO and chairman of the board
Bill Fenech, president of Thor Motorcoach
Tim Tiffin, general manager of Tiffin Motorhomes
Robert Olson, chairman, CEO and president of Winnebago Industries

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One Response to “Seven Motorhome OEM’s Tout SCR Engines”

  1. Gary Ver Hage on November 18th, 2010 3:28 pm

    “Let the facts speak fro themselves”. What facts? The letter implies that these manufacturers had a “choice” in what to use. There was no choice. The choice that they made added 600 pounds to there coaches and huge cost. As far as the fluid being availible and the same cost as diesel. The last customer I talked to that bought it for his pick up paid 12.00 per gallon. And it is an additional cost. And had to drive 20 miles to find it. How can you add fuel economy to an engine when your injecting into the exhaust? I thought economy was established in the the cylinder. That sounds like EGR. Also how long is your exhaust system going to last injecting this caustic substance in your exhaust? By the way the first bus we got in with the other “choice got 9.6 miles the gallon over 2300 miles. It is also more powerful and quieter than anything I have ever driven.