My take on this is partly due to the difference in compression of the two types of engines also. I visited a www site once that walked you through that process. Then part of the answer is also sleeves vs cast-in-the-block cylinders. Seems the sleeves are more prone to move as compared to being cast in.
One other thing to consider, especially on OTR big rigs is that a million miles is a normal usage rate and some rigs run more than that. Course OTR rigs have a separate "ion" filter that is used rather than an additive like JD makes for their tractors. It filters the water and is part of the regular oil change type intervals.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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