Butch50 that's the way I understand it also. I was toid that Nexus has about 50 Terrastars left with the Maxxforce engine platofrm. Then because of EPA standards I am sure they will be moving to something else. From what I have read the Maxxforce engines got a bad rap because of some prior problems(2012 and back). from everything I have read the issue has been resolved in later models. But with that said I am sure the new platform will be using Urea as most others do.