Who to Choose

Choosing what diesel is best all depends on what kind of use it will be put to.  For personal driving and light hauling you have three main choices; GM, Dodge, and Ford.  GM's Diesel is called the Duramax, they are built through Izuzu which is owned by GM.  Dodge uses the Cummins, which is made outside of Chrysler by Cummins. Cummins makes diesels for almost everything imaginable, their engines are all in line six engines meaning there are six cylinders all in a line.  This differs from the Duramax and Powerstroke which are both v8's (all of which are turbo charged).  Duramax and Allison transmissions have been partnered since 2000 when GM switched from the 6.5 GM diesel to the 6.6 Duramax Diesel.   For commercial trucking there are many options, Daimler owns Freightliner and Sterling who both manufacture semis for commercial trucking. Mack owns pretty much everyone else on the road today.