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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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