Forum Discussion

midasman's avatar
midasman
Explorer
Mar 31, 2015

Reliability of coaches using DEF

I have wanted to upgrade as my Holiday Ambassador is moving toward it's 10th year. How are people doing with the newer coaches using DEF? It's made me wonder if moving back to a gas coach makes more sense. Or, keeping and modernizing my diesel pusher. We do Ouray, Colorado every year which means pulling my Jeep Wrangler over the Million Dollar Highway, climbing higher than 12000 feet...
Class A
  • ScottG's avatar
    ScottG
    Nomad
    Apr 01, 2015
    Thunder Mountain wrote:
    We too are looking at a new coach as we are approaching ten years. One salesman told us the DEF engines actually get better mileage. Tell me if this is fact or just another example of a salesmen telling the tale to make a sale.


    In theory it can be true.
    It's because the DEF system works so well that they are able to put some of the timing and fuel curves back where they used to be when diesels got such good fuel efficiency.
  • Thunder_Mountai's avatar
    Thunder_Mountai
    Explorer II
    Apr 01, 2015
    We too are looking at a new coach as we are approaching ten years. One salesman told us the DEF engines actually get better mileage. Tell me if this is fact or just another example of a salesmen telling the tale to make a sale.
  • phranc's avatar
    phranc
    Explorer
    Apr 01, 2015
    Considering the millions of miles put on by over the road trucks,
    I would also say...A non issue ..
  • Mr_Mark1's avatar
    Mr_Mark1
    Explorer
    Apr 01, 2015
    We have DEF too, no problems in 11,000 miles. Had to learn how to operate the pump when using two different fuels. Piece of cake. LOL!

    Don't worry about DEF.

    MM.
  • ScottG's avatar
    ScottG
    Nomad
    Apr 01, 2015
    I have a neighbor who works where there is a fleet of medium duty trucks that use DEF. They are the most reliable trucks they have ever had.
    As said before, DEF is a non-issue.
  • sch911's avatar
    sch911
    Explorer
    Mar 31, 2015
    DEF has become a huge enabler for the engine manufacturers allowing higher combustion pressures, higher temperatures, and higher outputs (HP/Torque). With DEF they don't have to deal with the emissions side of things as much.
  • rr2254545's avatar
    rr2254545
    Explorer
    Mar 31, 2015
    DEF is a non issue - we have 26K on our motor home. It is just to make the diesel have a cleaner exhaust

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