The 6.7 Cummins engine is based on the 5.9
It is built by a Cummins/CNH/Iveco joint venture called EEA, European engine alliance.
It is used in the New Holland and Case tractors for about a year or two. Several truck manufacturers use these engines, badged either Cummins or Iveco. The new Holland TS-A series was the first to use the 4.5 liter 4 cylinder version of this engine.
Dutch truck manufacturer DAF, which is a subsidiary of Paccar which also holds Kenworth and Peterbilt, has Cummins build a version to Paccar specifications for their medium weight trucks up to 15 ton, built in Britain in the former Leyland plant. These trucks soon will hit the market in Mexico as Kenworth and Peterbilt, and assumed is that North America will follow within a year. The paccar brands also will get the 12.6 liter DAF XF engine, which is now sold with Paccar instead of a DAF badge.