Originally Posted by Fifty150hs

The X is like any other machine. If you do proper maintenance and replace worn parts before they break, the machine will last a long time. I have over 255,000 miles on my X and it is running fine. The M54 engine, from what I've heard, read and observed is practically bullet proof if properly maintained. That said, you better be willing to DIY or you will spend far more than the value of the truck in mechanics labor costs than it's worth.