Is the 5.9 or 6.7 Cummins more reliable?
Is the 5.9 or 6.7 Cummins more reliable? To sum up, the more simplistic 5.9 fixed geometry turbo means that while it tends to be more reliable, the more advanced 6.7 variable geometry turbo gives better performance. The Exhaust Brake is a big part of why the 6.7 Cummins is such a powerful towing machine. What's the difference between 5.9L and 6.7L Cummins engines? 5.9L Cummins engines built between 2003-2007 and all 6.7L mills utilize a high pressure common-rail fuel system. At the heart of the system sits a Bosch CP3 injection pump, which is responsible for creating in excess...