Sorry, gonna have to disagree with you. I have grown up around trucks, driven them and maintained two decent sized fleets. Our 2001 Western Star has a 500HP 60 series detroit in it that has not been cracked open at 985,000 miles, still runs like a top, blowby is starting to increase so will probably get a liner kit around 1,000,000 or so miles, tranny is getting loose anyway. The W900B Kenworth I drove before that had a 475HP 3406E cat with 780,000 miles, never been opened. My old mans `76 Pete with a 400 Cummins had 600,000 on it when he sold it.
There are lemons out there, but if properly maintained, big diesels will last a long time. In my experience, I don`t trust the newer engines that are making over about 500HP to last nearly as long as the lower-rated engines. I would never own a truck with one of the newer emissions engines in it, or one of the new 550-650HP hot-rods. Most of the ISX cummins I have been around have EGR issues, and most have been rebuilt by 450,000 and some don`t make it that long, same with the newer CAT and detroit motors. I think we are just trying to push too much power out of a given displacement, and the same thing applys to newer pickup diesels. That is why if I get a diesel pickup, it will have a P-pumped 12 valve cummins in it, and it will not get turned up.
And you are right that big rigs get run longer every time they fire up, that makes a big difference in longevity, and that will have an effect on a pickups lifespan if it is used to go get groceries.
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