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The 12 valve is the holy grail as for the best engine put in a pickup. They are just tough and reliable.
The 24 valve is also a very tough engine and very reliable. The VP-44 is its biggest issue. If one goes out, you may have warning, or you may be dead on the side of the road. The good news is when you lose a VP-44, it does not melt a piston. My original pump went 325,000 miles and I made 640 horsepower with 285,000 miles. I drag raced it some, hot rodded on the street, and towed a few hundred different trailers with it. Keep the fuel clean, run 15-18psi pressure and use a good additive and they will hold up fine. VP-44's are alot cheaper than common rail injectors, and just as reliable.
The Common rail is another story. They run good when the injectors are good, but at any given moment, you may be sitting on the side of the road with several thousand dollars damage from a melted piston. Year does not matter - the early ones melt too.
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