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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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