[Elsie]

Running older equipment is also difficult because today's newer mixes of fuel with ethanol destroys older vehicles with carbs and older O-rings and cork gaskets.

You can still get the good stuff...

http://www.fuel-testers.com/find_ethanol_free_gasoline.html

[Yosemitest]

If you replace it with "good stuff", then the ethanoled fuels will just eat it out again/
And if you use "ethanol tolerant" parts, then they won't seal right and you wind up with fuel leaks, which can cause a fire and burn your older equipment up.
Then you've got no equipment, and just a hunk of scrap metal.
And that old $4,000 to $15,000 tractor, now cost $30,000 to $60,000 to replace.
Oh, the new equipment cannot stand an "overload" of work effort like the old equipment could.
If the "data plate" says maximum load of "X". and you accidentally exceed that weight or load by more than 10 percent (which ion the farm is very easy to do) then you break something, and you're down for repairs.