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How about this? Open road driving is about 50 miles per hour average, so that 100 hours equals 5000 miles. Oil changes and other maintenance can be done at 5000 mile intervals and save the cost of lubricants and labor. City driving is about 20 to 30 miles per hour average, so that 100 hours equals 2000 to 3000 miles. Oil changes have to be made at the 2-3000 mile intervals to adequately protect the motor from the dirt and other contaminates that the motor oil is carrying. The new motor oils do not lose viscosity like the oils of 20 years ago, but there is so much dirt and contaminates in the oil. Sending the oil fumes back into the combustion chambers, as is done on car and truck motors, will cause these contaminates to gunk up the sensors and intake systems. Passenger car and truck engine maintenance schedules don't necessarily apply to tractor usage. For tractors, 50 to 100 hours is a good measure of when to change the oil depending on the usage that the tractor is enduring. Heavy pulling in dusty conditions, like plowing or field conditioning may necessitate an earlier oil change. Lighter work in cleaner conditions would allow for oil changes at the 100 hour mark. But that isn't the only factors. Oil that sits in an idle tractor can be contaminated by water from condensation. I've seen new oil turn into something like chocolate milk in a tractor that was stored for a year. Running the tractor with that in it would have been disastrous. My tractors work on the weekend, and not every one. The oil gets changed every 50 hours or 3 months, depending on frequency of use. Hope this helps.
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