Like I said- there is no pefect equasion. So, no, I'm not sure with any of it. 40 has been the average rule-of-thumb used by many people for many years.
No matter what, we are comparing apples to oranges. Farm tractors are HD engines made to work hard. Some do and some do not. Those that I had good knowlege of over the years, that worked hard much of the time, and were well maintained usually lasted around 10,000 hours before a tear-down was needed.
With cars and trucks? I got 520,000 miles out of the 6.2 diesel in my 87 Suburban - but many 6.2s died before 100K. So how to your figure?
If I say my 520,000 mile Chev 6.2 is equal to 10,000 engine-hours in a John Deere 4020 - then we've got a "50" number to convert with.
If I say it's a 100,000 mile Chevy engine that should count, then we have a "10" number to work with.
The only good common measure that I know of - is a measurement of how much fuel an engine has used in its life. Cummins and Cat use that standard sometimes. Amount of fuel takes into account how hard an engine is worked,, how fast it turned, etc. Probably a better measure then hours or miles.
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