When the 656 came out it was using diesel that was around 5500 parts per million sulfur. Sulfur content for both on and off road had been cut to 500 (low sulfur diesel) parts per million and "newer" highway diesel engines are designed to run on Ultra Low Sulfur diesel about 15 parts per million. I would run 500 parts per million simply because of cost - but even that "high" amount isn't enough to satisify the lubricating needs of a 1960s (if it hasn't been replaced since the early 1990s) diesel injector pump that was designed and used for years with 5000+ parts per million diesel.
In 2010 all you'll be able to buy is ULSD for off road use anyway.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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