My first two cylinder was a 520 about 10 years ago. I bought it from the old farmer that I bought my farm from. I knew him for a year or two before buying his tractor. He has since passed away but I can still hear him say, "John Deere didn't know what they had when they stopped making that tractor. The 520 is the best tractor they built". The first tractor I owned was a Farmall C that I had rebuilt. I really liked that C but now that I had the 520 I thought; now I have a REAL tractor! Three point hitch, loader, hydraulic remote, power steering, etc. Comparing the Farmall C with the 520; huge difference in tractors. Just comparing the oil fill caps; the C has a tin cap slips on and weighs a few ounces. The 520 has a cast iron cap screws on and weighs probably close to a pound. Don't get me wrong I still like my little C, still use it to rake hay. Sorry for getting off track, the original question wasn't about comparing colors. It has been a GREAT tractor! It has a 45 loader which was used to move round bales. It has never failed to start evening the coldest Missouri winter days. I still use it to load smaller round bales. Its will balanced with the loader, the hydraulic system is amazingly strong. No. 1 cylinder plug did foul on me a month or so ago. I replaced the plug and thought it would be fun to see how slow it would idle. I held the throttle closed. Don't know exactly how slow it ran but I bet it was well under 100 rpm and it never stalled. I don't think you will find a hard fast answer but just personal opinions.
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