I don't have to prove anything, but some facts are well known, and easily verifiable.
You don't seem to know what you are talking about.
#1 Your comments about degergent oil are wrong. Seems you've got anti-wear additives confused with degergent additives. Granted, many people assume that non-degergent oils are "old fashioned" and therefore don't have those anti-wear additives. But, that was only true for automtotive oils made before 1950. A "pure mineral oil" is the oil without the wear additives. A true break-in oil that is made to promote some wear IS pure mineral oil - not specifically non-degergent. A true break-in oil made to prevent wear is the opposite and has extra ZDDP added. GM sells it, as to many aftermarket camshaft companies.
About John Deere and the way they build engines? The way they do it has changed radically since the late 80s. They made big changes in their machining processes and tolerances when the 50 series came out. So did all the car/truck companies. Again, you speak with little knowledge.
You also seem to have a reading-comprehension problem since you claimed that I said there is "no break in" anymore. The fact is, I never said that. I just said it's a shorter period.
I remember many new engines in the 60s, that were high-compression, that would use oil and smoke until you hammered then and drove them for 5000-10,000 miles. That was due to imperfections in cylinder walls and a few other things.
If your Cummins 5.9 diesel was so crudely put together, that fuel mileage was as poor as you claim early on - it would also of skipped at cold start, smoked, and used oil. I doubt you had that problem - but if you did, you had a lemon.
And as I already said, a truck when moving has many metal and rubber parts causing friction. They too can "wear in" and turn easier over time. For a reason that escapes me, you choose NOT to believe that, yet you are eager to believe that takes place inside the engine. That is, unless you think the entire problem is cylinder-wall and compression related. If so, you're back to an oil-eating, smoking, skipping diesel engine.
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