Ivylog wrote:
MPG is not even in the ball park of possible expenses on that engine. You need to read these 32 pages on repeated #6 broken valve on the ISX engines: http://www.irv2.com/forums/f123/cummins-isx-broken-valve-in-6-a-401436.html
#6 broken valve
There is a post today on it in a 06 ISX...not sure yet if it was a 600 HP. I have a 06 525 HP that hopefully is not prone to this problem.
http://www.irv2.com/forums/f123/isx-cummins-failure-473121.html
2006 ISX
Good advice. I would buy an new ISX, but not one of the older models.