Not an answer to your question, but just another viewpoint. I'm a former over the road driver. In the stagecoach business, service was done at approx. 10,000 miles. Very little idling time, so the average speed was a bit higher. Those were Detroit 2 cycle 8v71 powered. Engines were rebuilt in house at 750-800,000 miles In the freight game, with some idling time for heat or a/c while resting, average speed was around 30 mph. When I started with the last company complete service was done at 10,000 miles. later it was extended to chassis lube at 10,000, oil & filter change at 20,000. By the time I retired it was extended to chassis lube at 20,000, oil & filter at 40,000. Those were mostly Cummins 14 liter powered. Oil samples were lab tested. Had the okay from Cummins, they honored the 500,000 mile warranty.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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