Had an 05 2500 Cummins. 5.9 engine. Ran it for over 200K miles, put a water pump, idler and serp belt on it and had the front end rebuilt at 110K miles. Other than those maintenance items, no down time at all. Traded it for a 2011 in 2013, deleted it at 100K miles and just had the front end done. No problems and I really like this truck!