Best diesel engines for longevity

Alright reddit, I need some help here please.

I've been doing research for over a month now, but no amount of reading can give you the know how that comes along with actually owning these trucks.

I know the 7.3 Powerstroke and the 5.9 Cummins (12 valve) are going to last the longest without having to bulletproof or modify them at all.

Question is, can any other diesel engines last as long when modified for longevity?

People argue back and fourth on this, especially with a bulletproofed 6.0.

I never plan on adding any power to my engine, I just want it to last forever.

Thanks!