Some one in the real know!! I have been told by several truck shops including the cummins dealer that the 4bt is a great engine, but it is known for it's severe vibration each person has noted, look at the frito lay trucks and how they vibrate apart! I believe I would love to use one of these engines in a coversion for my daily comute to work 80 miles round trip... I currently drive my power stroke which is converted to WVO , bit still would like more milage.. Tigman