Extended idle, excessive regens,broken down oil... 60-80k miles worth of horrible conditions on the oil.
When the 6.4's first came out, one of the techs I worked with got one and it went through three engines in under 200k. The truck idled the entire time it was on a site.
Get rid of the regen cycle, and you alleviate this big time
what is the regen cycle? thx, rm