I have 226,000 on mine. It's my daily driver/mud machine/trail machine/whatever and it runs like a top.I run all amsoil in it, the fully synthetic, and change it every 6,000 miles, sometimes sooner depending on how much i hit the mud.
It's all in the maintence. My dad has an isuzu I-mark diesel with over 700,000 miles on it. But he keeps the maintense regular on it.