King of the light duty application for any make, mainly due to, it is a medium duty engine, and many have actually been worked hard for 1,000,000 miles, when the life expectancy is 300 to 500 thousand on an average, thats even in the medium duty application.
How many times did the Duramax have the heads redesigned because the inferior aluminum heads would give out, so they had to add head bolts to keep them down. How many CTD's have you heard of, were the overheating problem couldn't be solved. What about the glow plug issue for the LBZ when first introduced that caused many engine replacements when they exploded in the cylinder. I had to drive a 05 D/A for about 30K miles and was not impressed with the poor performance when at 10K GVW. Not to mention, its a Izusu designed engine, ya I know its made here, so what, it is still there design.
How many engine failures, and I'm not talking about the turbo's or head gasket failures, for the 6. ohno, but actual complete meltdowns while at the limit of the recommended GCVWR for the Ford, mind you not the axle ratings which can take it up a lot more. The 7. 3 is a dog but pulls like a train and has proven durable, the problem is the design for the lifter/injector pump that robs the needed passing power, causing you to get stuck behind a Semi going a lot slower pulling heavy up a grade. Now this one is a personal issue, every Ford I have ever owned was a POS.
Now I won't leave out any 5. 9 issues that I'm aware of, "B" block and dow pin issues, but with the 100K mile engine warranty, it was taken care of under warranty. The reason for engine redesign on the 5. 9 CTD's was mainly due to strict emissions regs, but the 5. 9 just got stronger and more powerful and remained reliable. There's nothing better than pulling my 5ver at 22K GCVW on a long grade, when all of a sudden a Semi pulls out in front of me trapping me and causing me to slow, when he moves back over or the left lane clears, Just drop down a gear and "BAM" I'm back at the cruising speed.
That is why the CTD is King.
