i know alot has to do with regular maintenance intervals, but what do most of these trucks average before the engine either needs to be rebuilt or replaced, or retired?

notice lots of trucks at 300,000 miles when their owners decide to sell them..

thanx in advanced!

 

There are a few guys with over 500k and I've heard one mentioned thats around 1.25 million! All depends on how they're maintained and used.

EDIT: Oh, and welcome to . There's lots of good info around here.

 

I have a 2000 with 182k miles,a 2001 with 158k miles and a 1999 with 46k miles.No issues other than minor rust stuff.The engines are brick craphouses!
I have seen dozens over 300k miles and ruunning fine.I know of one approaching 700k miles and has only had a set of injectors.(and a few water pumps)The guy runs Amsoil since day one with some sort of aux. oil filter system.
It really is all about how they are maintained.
Damn fine motor!