That was my point exactly, I ran a lot of early 70's caterpillar equipment, the larger ones did seem to belch out some black plumes, though I don't know if any were turned up. The D8K was not too bad, but with the evolution of that engine, spacer plate era and similar it may not have been ideal to fool with those since they were at their peak of performance, pushing it only increased problems.
The old D7's were slow and steady,(though the ratios in both of mine seem to be a little fast even in low gear) it was said they were too big for small work, and maybe a little under powered for large work. Kind of an in between size, another factor in their surviving numbers.
In the books they describe some of the fuels, I think you could run light to heavy fuel oils, possibly bunker oil, if I recall.
I know there is something that wears or gets weak with the engine governor, once they got some hours on them, you would lose some power, there was a retired mechanic on the ACMOC forum who worked at a dealer in PA, in the engine department, he always mentioned this.
That is one of the reasons, I think these great old tractors were seemingly dotted all over the U.S. as the contractors supported the manufacturer by purchasing newer equipment, many of these were sidelined, some in maintained condition, with a lot of life left in them, others worn out. It just seems like it was a by product of the advancement as you describe, which surplus'd an era of tractors in a sense.
Caterpillar played a role in oil development, I believe, contributing or playing a significant role in developing modern oils at some point.
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